A mole is defined as the quantity of a material that includes precisely of the substance's elementary entities.
How do you calculate the number of moles?The number of moles formula is expressed. The formula for molecular weight is.Number of moles = mass of substance / mass of one mole.Calculating a response rate is a rather simple process. A reaction rate must be calculated from tabulated values or discovered empirically because it is based on change over time. The reaction rate can be calculated algebraically or graphically using the data that was gathered. To translate between mass and particle count, utilise the mole idea. The term "molarity" (M) refers to the amount of solute per litre of solution. A clean 1-L volumetric flask should be partly filled with distilled or deionized water before adding 1 formula weight of the compound to create a 1 M solution.To learn more about moles refer to:
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Answer: 4
Explanation:
Pls pls help me
In wildlife photography, it is common for the subject to be placed in the middleground. What techniques do these experts use to put the focus on their subjects in the middleground? How have you used these techniques in your own photography practice?
The technique that wildlife photography experts use to put the focus on their subjects in the middle ground is called Deep Focus.
How do you use Deep focus when making a film?A narrow aperture is typically used to produce deep focus. Because a camera's aperture regulates how much light enters the lens, obtaining deep focus necessitates a bright picture or a lengthy exposure. A wide-angle lens also sharpens a bigger section of the image.
Deep focus in cinematography maintains a tight focus on all parts of an image, catching crucial actions in both the front and background.
Deep focus is used by directors for situations with significant movement in both the front and background of the frame. This type of staging is known as "deep space" or "deep staging" by directors because it involves the placing of performers, props, and set elements at tremendous depth.
A filmmaker must be able to capture a well-defined image for such a shot to succeed. Such sharpness is possible with a deep-focus photo.
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Solution #2 will need to contain 11 g/L of cerium (IV) ammonium nitrate (Ce(NH4)2(NO3). We will need to prepare 50.0 mL of solution 2. How many grams of cerium (IV) ammonium nitrate will we need to measure out?
The mass (in grams) of (NH₄)₂Ce(NO₃)₆ needed, given that the concentration of the solution is 11 g/L, is 0.55 g
How do I determine the mass of (NH₄)₂Ce(NO₃)₆?The concentration of a solution in grams per liter is defined as follow:
Concentration = mass / volume
Using the above formula, we can calculate the mass of (NH₄)₂Ce(NO₃)₆ needed to prepare the solution. This is illustrated below:
Concentration = 11 g/LVolume = 50 mL = 50 / 1000 = 0.05 LMass =?Concentration = mass / volume
11 = mass / 0.05
Cross multiply
Mass = 11 × 0.05
Mass = 0.55 g
Thus, the mass of (NH₄)₂Ce(NO₃)₆ needed is 0.55 g
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Differentiate between an organic combustion reaction and an inorganic combustion reaction.
Use the table below to calculate the atomic
mass of element X. Then use the periodic table
to identify the element. Show all your work.
The element is Oxygen and the atomic mass is 15.99 or we could say
16 amu.
How would you define atomic mass?The weight of one atom in a chemical element is its atomic mass, denoted by the symbol ma. Protons, neutrons, and electrons, three subatomic atomic particles with atomic masses, are involved.
A chemical element's atoms are the basic building blocks of matter. An atom's central nucleus, which is composed of all of them, is surrounded by one or more negatively charged electrons. The positively charged nucleus contains one or more of the relatively heavy protons and neutrons.
15.995 x 99.762/100 = 15.956
16.999 x 0.00038 = 0.00645962
17.999 x 0.002 = 0.035998
The atomic mass of element X = 15.956+0.00645962+0.035998
For a total of approximately 16 or 15.99, we add these.
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this experiment focuses on a chemical reaction based on alka-seltzer tablets, which you may have at home and even used yourself. however, we can still view this reaction through the chemical perspective we've been developing in this class. gg
Sodium bicarbonate and citric acid are used in this activity's interaction to create water and carbon dioxide.
HCO3- (aq) + H+ (aq) H2O (l) + CO2 (g)
Citric acid and sodium bicarbonate (NaHCO3) are also present in the pills Hydrogen ions (H+) and bicarbonate (HCO3-) are created when the tablet dissolves in water. The two compounds can then react in accordance with the reaction described above once they are in solution. The HCO3- and H+ must contact at the proper angle and with the appropriate amount of energy for the reaction to take place. Since there are more opportunities for collisions when the tablet is broken into more pieces and when the temperature is higher because the molecules are moving more quickly, the likelihood of this happening increases.Students will test out several scenarios for how Alka Seltzer tablets and water interact in this project. Students will start to understand what variables chemical engineers can regulate to achieve the desired outcome by varying temperature and the surface area available for reaction.It is customary to complete this task before making rockets in order to familiarize oneself with the reaction's characteristics before employing it in the Alka Seltzer Rockets exercise.Hence, Sodium bicarbonate and citric acid are used in this activity's interaction to create water and carbon dioxide.
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Which measurement of length is the smallest?
O 9 x 10-6 m
O 7 x 10-5 m
07 7 x 10¹ m
O 9 x 10² m
O 9 x 10-6 m.The "Planck length," so named after Max Planck, is the shortest unit of length.It is equivalent to 1.6 x 10-35 meters, roughly.It is around 10–20 times smaller than a proton due to its extreme smallness.
What is the tiniest meter?One thousand times smaller than just a micrometer is a nanometer (nm).It is equivalent to one billionth of a meter, or 1/1,000,000,000 of a meter.When something is this small, neither your eyes nor a light microscope can see it.
From smallest to largest, which unit?Its metric units for length are millimeters (mm), centimeters (cm), metres (m), and kilometers (km), in that order (km).10 mm make up 1 cm, 100 centimeters make up 1 m, and 1000 m make up 1 km.All nations, with the exception of the United States, Liberia, and Myanmar, utilize metric units of length.
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Using Newton’s 2nd Law (F = ma) complete the following table for different types of cars.
The force needed to accelerate the Toyota Camry is 7,659 N.
The force needed to accelerate the Chevy Suburban is 11,297.6 N.
The force needed to accelerate the School bus is 83,720 N.
The force needed to accelerate the Semi Truck is 193,701.4 N.
What is Newton's second law of motion?Newton's second law of motion states that the force applied to an object is directly proportional to the product of mass and acceleration of the object.
Mathematically, Newton's second law of motion is given as;
F = ma
where;
m is the mass of the objecta is the acceleration of the objectThe given parameters include
mass of the Toyota Camry, m = 1665 kgmass of Chevy Suburban, m = 2,456 kgmass of school bus, m = 18,200 kgmass of semi truck, m = 42,108 kgThe force needed to accelerate each of the cars is calculated as follows;
F ( Toyota Camry ) = ( 1665 kg ) x ( 4.6 m/s² ) = 7,659 N
F ( Chevy Suburban ) = ( 2,456 kg ) x ( 4.6 m/s² ) = 11,297.6 N
F ( school bus ) = ( 18,200 kg ) x ( 4.6 m/s² ) = 83,720 N
F ( Semi Truck ) = ( 42,109 kg ) x ( 4.6 m/s² ) = 193,701.4 N
Thus, the force needed to accelerate each cars is a function of mass and acceleration of each of the cars.
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The complete question is below;
Using Newton’s 2nd Law (F = ma) complete the following table for different types of cars. mass of the Toyota Camry, is 1665 kg, the mass of Chevy Suburban, m = 2,456 kg, the mass of school bus 18,200 kg and the mass of semi truck, m = 42,108 kg
The three dienes(red) associated with compound A - C do not react similarly with a dienophile. One diene has a low activation barrier and reacts rapidly; one diene has a high activation barrier and any product formed will be highly reactive; and one diene is inactive. Select the answer that lists dienes A, B, and C from most reactive toward a Diels-Alder reaction to unreactive.
A) c,b,a
B) a,b,c
C) a,c,b
D) b,a,c
How many grams of Calcium are in
2.17 x 10^25 atoms in Calcium?
Answer:
36 grams of Calcium
Explanation:
In order to calculate the gram of calcium, divide the total number of Calcium atoms by Avogadro's number:
(2.17 x 10^25)/(6.02 x 10^23) =
2.17/6.02 * 10^25/10^23 =
2.17/6.02 * 10^25/10^23 =
0.36 * 10^(25-23) =
0.36 * 10^2 =
0.36 * 100 = 36 grams of Calcium
Which of the following correctly identify the main types of oxidizing agents used in organic oxidation reactions?
A) Alkali metals dissolved in ammonia
B) Reagents containing H2 on a metal catalyst
C) Reagents containing a carbon-halogen bond
D) Reagents containing an oxygen-oxygen bond
E) Reagents containing an oxygen-metal bond
The following correctly identify the main types of oxidizing agents used in organic oxidation reactions :
D) Reagents containing an oxygen-oxygen bond
E) Reagents containing an oxygen-metal bond
The oxidation reaction are the reaction is the removal of the hydrogen is called as the oxidation reaction . the increases in the oxidation number or we can say that the loss of the electron are called as the oxidation reaction. The removal of the oxygen is called as the reduction reaction . the decreases in the oxidation number or the gain of the electron is the reduction reaction.
Thus, the Reagents containing an oxygen-oxygen bond and Reagents containing an oxygen-metal bond are main types of the oxidizing agents used in oxidation reaction.
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Evidence II
How did the suspects make the silver coins look gold?
The zinc coating makes the coin appear to have a new silver covering. Brass is created when a coin is heated in a Bunsen flame due to the migration of zinc into the copper's surface layer. This gives the coin a gold appearance.
The following describes how zinc and sodium hydroxide react to generate sodium zincate:
Na2[Zn(OH)4](aq) + H2 = Zn(s) + 2NaOH(aq) + 2H2O(l) (g)
A wire or direct contact between the copper and the zinc, as in this case, is required for the plating reaction to occur in an electrochemical cell.
The following electrode reactions:
Zn(s) Zn2+(aq) + 2e- at the zinc electrode, then the zinc ions complex as [Zn(OH)4].
2–(aq)
Zn(s) + 4OH- at the copper electrode: [Zn(OH)4]2-(aq) + 2e- (aq)
The zinc coating gives the coin the appearance of having a silver coating.
To determine the amount of zinc added, weigh the coins both before and after plating.
Brass is created when the coin is heated under a Bunsen flame because the zinc migrates into
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51.8 ml of 1.41 m perchloric acid is added to 32.8 ml of calcium hydroxide, and the resulting solution is found to be acidic. 16.5 ml of 3.04 m potassium hydroxide is required to reach neutrality. What is the molarity of the original calcium hydroxide solution? M
Molarity of the original calcium hydroxide solution = (16.5 ml x 3.04 m KOH) / 32.8 ml = 0.95 m
Step 1: Calculate the moles of perchloric acid in the original solution:
Moles of perchloric acid = (1.41 m)(51.8 ml) = 72.3 moles
Step 2: Calculate the moles of calcium hydroxide in the original solution:
Moles of calcium hydroxide = (32.8 ml)(1 M) = 32.8 moles
Step 3: Calculate the moles of potassium hydroxide needed to reach neutrality:
Moles of potassium hydroxide = (16.5 ml)(3.04 M) = 49.76 moles
Step 4: Calculate the moles of calcium hydroxide in the solution after the addition of the potassium hydroxide:
Moles of calcium hydroxide = 32.8 moles + 49.76 moles = 82.56 moles
Step 5: Calculate the molarity of the calcium hydroxide in the original solution:
Molarity of calcium hydroxide = (82.56 moles)/(32.8 ml) = 2.52 M
Molarity is a measure of the concentration of a solute in a solution. It is expressed as the number of moles of solute per liter of solution (mol/L). It is used to calculate the amount of a solute that must be added to a solution to achieve a desired concentration. It is also used to measure the amount of a substance in a given volume of solution. Molarity is a key concept in chemistry, and is important to understand when discussing the behavior of solutions and the reactions they undergo.
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Next, match each of these reactions with the statement below, by writing the appropriate letters in the blanks which follow:
1. Solutions of cupric chloride and silver nitrate are mixed. A precipitate forms: silver chloride. Also, the dissolved compound cupric nitrate is formed.
2. Aluminum acetate and sodium phosphate solutions are mixed, and form aluminum phosphate as a precipitate, plus dissolved sodium acetate.
3. Gallium bromide and potassium sulfide solutions are mixed, and a precipitate forms (gallium sulfide). Also, the dissolved compound potassium bromide is also formed.
4. Solutions of sodium chloride and silver sulfate are mixed. Silver chloride forms as a precipitate. Dissolved sodium sulfate also forms.
5. Zinc bromide and ammonium sulfide solutions are mixed. A solution of ammonium bromide forms, and zinc sulfide leaves the solution as a precipitate.
6. Gallium iodide and lead (II) nitrate solutions are mixed. A yellow precipitate, lead (II) iodide, forms, as does dissolved gallium nitrate.
7. Stannic chloride and sodium sulfide solutions are mixed. The ppt. which forms is stannic sulfide, and dissolved sodium chloride remains in the solution.
8. Potassium hydroxide and cupric sulfate react 10 form a precipitate of cupric hydroxide, as well as dissolved potassium sulfate.
Potassium hydroxide and cupric sulfate react 10 form a precipitate of cupric hydroxide, as well as dissolved potassium sulfate, the reaction is shown below:-
2CuSO4 + 4KI⟶ 2CuI + I2 + 2K2SO4
What is precipitate?
In aqueous solutions, precipitation is the procedure of remodeling a solute from a supersaturated strategy to an insoluble stable. The stable that bureaucracy is referred to as a precipitate.
Therefore, Potassium hydroxide and cupric sulfate react 10 form a precipitate of cupric hydroxide, as well as dissolved potassium sulfate.
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which of the following is not the correct chemical formula for the compound named? remember: transition elements have variable charges.
The name of the ionic compound is Copper(II) fluoride and its chemical formula is CuF₂.
Ionic compound
The compound which is formed when electron gets transferred from one atom to another atom is known as ionic compound. Ionic compounds are formed usually when a metal reacts with a non-metal.
The nomenclature for writing the formula of an ionic compound is given as:
1. The name of the positive ion is written first.
2. The name of the negative ion is written next and a suffix is added at the end of the negative ion. The suffix written at the end is '-ide'.
3. In case of transition metals, the oxidation states of the transition metals are written in roman numerals in bracket in-front of the positive ions.
CuF₂ is an ionic compound because the element copper is a metal and the element fluorine is a non-metal. The bond that is formed between a metal and a non-metal is always ionic in nature.
The oxidation state of copper in CuF₂ is, (+2)
Thus, the name of ionic compound is, Copper(II) fluoride and its chemical formula is CuF₂.
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Based on your pH data, calculate the concentration of H3O+ and the degree of ionization of acetic acid in solution 1-3. Solution 1 pH=2.73 Solution 2 pH=2.93 Solution 3 pH=4.79 and hpw do these results compare with expected behavior.
10-6mol dm-3 of H3O + ions are present in pure water.
What occurs when acid is added to water in terms of the concentrations of H3O+ and OH?Acid reacts with water to release H+ ions, which combine with water to create H3O ions since they cannot live alone. This decreases the concentration of ions (H3O/OH-) per unit volume.
What is the pH of a solution with a concentration of hydronium ions H3O +) of 1.0x10 8 m?pH=−log(1×10−8M)=8. Consequently, the solution's pH value is 8.
How does the pH of a solution change depending on the amount of H3O+ ions present?The pH falls in solution when [H3O+] concentration rises. As a result, the solution's acidity rises.
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Calculate the root mean square speed for a sample of neon gas (Ne) at 298K. Your answer should have three significant figures.Use R=8.314 J/(K mol).
The root mean square (rms) value for Ne gas at 298k is 606.954 m/s.
Root mean square (RMS) speed of a gas is given by,
[tex]V_{rms}[/tex]=[tex]\sqrt{3KbT/m}[/tex]
where Kb = 1.38*10^-23 JK^-1 is the boltzmann constant.
T=Temperature in kelvin
m=mass of one molecule or an atom of the gas (in Kg)
We can also write the above expression as,
[tex]V_{rms}[/tex]=[tex]\sqrt{3RT/Mm}[/tex] where, Mm/m=R/Kb
where, R=8.314 JK^-1 Mol^-1 is the universal gas constant.
Mm= molar mass of the gas in Kg
for the neon(Ne) gas, Mm=20.2g/mol=20.2*10^-3 kg/mol
T=298k
putting all the values in the above equation, we get
[tex]V_{rms}[/tex]=[tex]\sqrt{3(8.314 Jmol^-1 K^-1)*298K/20.2*10^-3Kmol^-1}[/tex]
=[tex]\sqrt{367.956*10^3 m^2s^-2}[/tex] ( Since, 1J=1kg m^2/s^2)
=606.954 m/s
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4. 92.0 grams of sulfuric acid (H₂SO₂) are added to 43.2 grams of calcium.
Which reactant is the limiting reagent?
How much product is formed?
How much excess reagent remains?
(9 pts. total / 2 pts. for equation - 4 pts. for stoich - 2 pts. for limiting reagent - 1 pt. for excess
reagent.)
The sulfuric acid is the limiting reactant and the mass of the product obtained is 127.8 g.
What is the limiting reactants?We know that the term limiting reactant is the reactant that is present in the least amount. We can know this from the equation of the reaction. We know that the equation of the reaction is written as; [tex]Ca(s) + H_{2} SO_{4} (aq) ----- > CaSO_{4}(s) + H_{2} (g)[/tex].
Number of moles of sulfuric acid = 92.0 grams /98 g/mol = 0.94 moles
Number of moles of calcium = 43.2 g/40 g/mol = 1.08 moles
Given that the reaction is 1:1, the limiting reactant is the sulfuric acid.
If 1 mole of sulfuric acid reacts with 1 mole of calcium
0.94 moles of sulfuric acid reacts with 0.94 moles * 1 mole/1mole
= 0.94 moles of calcium sulfate
Mass of the calcium sulfate = 0.94 moles * 136 g/mol
= 127.8 g
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we saw that in the tlc plates, the 9-fluorenone moves far up the plate than the 9-fluorenol. that means that 9-fluorenone is a. 9-fluorenone is a larger moleculeb. 9-fluorenone is less polar than 9-fluorenol so it travels farther up the TLC plate.c. 9-fluorenone is aromatic so it travels farther up the TLC plated. 9-fluorenone is warmer than 9-fluorenol so it travels farther up the TLC plate
Polar molecules would move further in a liquid solution than in a non-polar solvent because they are more closely bound to polar solvents.
What does 9-fluorenone serve?The precursor 9-fluorenone has been used in the synthesis of a wide range of organic the electronic devices. Here are a few the typical instances: creation of the host for the blue and green organic light-emitting diodes (PHOLEDs).
Where is fluorene found?As the second most common PAH, fluorene is often present as a gas from a number of the sources, including tobacco smoke, resinous pitch, petroleum refining, exhaust fumes gases, and gasoline.
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Which pair of elements would most likely combine to form a salt?
Li and Ar
Ca and Al
Mg and Br
N and S
The pair of elements most likely to combine in order to form a salt would be Mg and Br. Option 3.
What are salts?Salts are chemical compounds formed by the combination of positive ions, usually from bases, and negative ions, usually from acids. In other words, salt cannot be formed from two positive or two negative ions.
Going by this definition:
Li and Ar are both positive ions and thus, cannot form a salt.Ca and Al are both positive ions and thus, cannot form a salt.N and S are both negative ions and cannot form a salt.On the other hand, Mg forms a positive ion, [tex]Mg^{2+[/tex], and Br forms a negative ion, [tex]Br^-[/tex]. Thus both can form a salt, unlike other options.
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raw the remaining possible stereoisomers for the following cycloalkane. label pairs of enantiomers and diastereomers.
Among the remaining possible stereoisomers for the following cycloalkane B and C are enantiomers and A and B are diastereomers.
Enantiomers are substances that have the same connections but different three-dimensional structures. One enantiomer cannot be placed on top of another because enantiomers are not identical to one another. The two opposite enantiomers are called mirror images.
Diastereomers, also known as diastereoisomers, are a subclass of stereoisomers in stereochemistry. Stereoisomers that are not identical mirror images are known as diastereomers. Therefore, they occur when two or more stereoisomers of a molecule do not mirror image each other and have distinct configurations at one or more equivalent stereocenters.
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3 rules that ionic compounds must follow
Answer:
Explanation:
Name the metal by its elemental name.
Name the nonmetal by its elemental name and an -ide ending.
Name polyatomic ions by their names.
The answer to this question= 3 rules that ionic compounds must follow are-
While naming an ionic compound, the cation should be named first and then only the anion should be named.For the species having multiple charges, for example, FeO and Fe2O3, naming these ionic compounds become difficult so in these cases we specify the charges using roman numerals, and this method is called the Stock system.In the formation of ionic compounds, one must take into notice that the positive and negative charges should be well balanced. Ionic compounds are further defined to have very high melting and boiling pointIonic compounds must be soluble in water.To learn more about Ionic Compounds,
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Which of the following best explains why more energy is required for the process occurring at 110 K than for the process occurring at 90 K? A. Intermolecular attractions are completely overcome during vaporization B. Intermolecular attractions in the solid phase are weaker than in the liquid phaseC. Electron clouds of methane molecules are less polarizable at lower temperaturesD. Vaporization involves larger increase in temperature
Vaporization totally overcomes intermolecular attractions. Water has an enthalpy of vaporization (energy required to boil) of 40.7 kJ/mol.
A is the ideal answer.
Which of the following best explains why CaF2 dissolves in water with a positive value for H?Which of the following best exemplifies how the positive value of H° for CaF2 dissolving in water is explained? In the crystal lattice, Ca2+ ions and F- ions have very potent ion-ion interactions.
Which of the following best justifies the claim and accurately determines whether Cl or Ar has the higher first-ionization energy?Due of its greater effective nuclear charge, Ar. The atomic radius and initial ionization energy of several elements are displayed in the table above.
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The hybridization of orbitals on the central atom in a molecule is sp2. The electron-domain geometry about this central atom is __________. A. octahedral
B. linear
C. trigonal planar
D. trigonal bipyramidal
E. tetrahedral
Planar trigonal C, The triangular planar molecules have a center atom that is linked to three other atoms and is sp2 hybridized. if the structure consists of just two bonds and one pair of electrons.
Which SP, SP2 or SP3, is more stable?The electrons of sp3 hybridized species are held farther away from the nucleus than those of sp2 (33% s-character) and sp (50% s-character) hybridized species because the s orbital is retained farther away from the nucleus and has a lower energy than the p orbital. The more stable the electrons are, the nearer to the nucleus they are.
What hybridization is the most potent?A relationship gets stronger and lasts shorter as its s-character increases. the strongest bond is a sp–sp bond, and sp3−sp3 bond is weakest.
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Which of the following will result in a linear plot when the natural logarithm of the species concentration (Al) is plotted against time? A. A reaction rate that is dependent on concentration of only one of the reactants. B. A reaction rate that is dependent on concentration of all the reactants C. A reaction rate that is Independent of concentration of any of the reactants D. All of the above.
The result in a linear plot when the natural logarithm of the species concentration (Al) is plotted against time will be (A) A reaction rate is dependent on the concentration of only one reactant.
The linear plot between ln([A]) and time will follow the First-order reaction kinetics, that is as follows;
ln[A] = -kt + ln[A]0
In the above-mentioned equation;
k = rate constant
[A]0 = initial concentration of the reactant.
By the equation, it is confirmed that it is a linear plot between ln([A]) and t.
Therefore, A reaction rate is dependent on the concentration of only one reactant.
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Suppose you heat a metal object with a mass of 32.4 g to 96.3 °C and transfer it to a calorimeter containing 100.0 g of water at 17.6 °C. The water and metal reach a final temperature of 24.8 °C. Metal in a covered cup with a thermometer and heat indicated as leaving the metal. What is the specific heat of the metal in J g ⋅ ∘ C ?
Specific heat capacity of a substance is the amount of heat required to raise the temperature by one degree Celsius of one gram of a substance. Therefore, the specific heat of the metal is 42.09J g ∘ C.
What is Enthalpy?Enthalpy term is basically used in thermodynamics to show the overall energy that a matter have. Mathematically, Enthalpy is directly proportional to specific heat capacity of a substances. Internal energy is the sum of all kinds of energy that the particles of a matter can possess, for example translational energy. Rotational energy.
for metal for water
m×C×(final temperature - initial temperature) = m×C×(final temperature - initial temperature)
Substituting all the given values in the above equation, we get
32.4 g×C×( 24.8 °C- 96.3 °C) = 100.0 g×4.18×(24.8 °C- 17.6 °C)
-71.5×C= 3,009.6
C= 42.09J g ⋅ ∘ C
Therefore, the specific heat of the metal is 42.09J g ∘ C.
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Classify each phase change as exothermic, endothermic, or neither exothermic or endothermic. Exothermic Endothermic Neither Answer Bank melting freezing vaporization sublimation deposition condensation Phase changes are transitions between solid, liquid, and gas phases. For example, ice melting is an example of a phase change from a solid (ice) to a liquid (water). Phase changes involve changes in energy. Which of the statements regarding phase changes are true? ✓ Melting is the conversion of a solid to a liquid. O Condensation is the conversion of a liquid to a solid. O Sublimation is the conversion of a solid to a gas. O Deposition is the conversion of a solid to a gas.
Melting, sublimation, and vaporizations are endothermic. Freezing, deposition, and condensation are exothermic.
What are endothermic and exothermic reactions?
Chemical processes referred to as endothermic reactions occur when the reactants take in heat energy from their environment to create products. These reactions produce a cooling effect by bringing the temperature of the space around them down. When a chemical connection is broken, energy is frequently released in the process. Similar to how physical bonds are formed, chemical bonds too require energy. There are numerous ways that energy can be provided or discharged (such as heat, light, and electricity). Endothermic reactions typically result in the creation of chemical bonds while absorbing heat from the environment.An exothermic reaction is one in which energy is given off as heat or light. The change in enthalpy (H) in an exothermic reaction will be negative. The net energy needed to start an exothermic reaction is therefore less than the net energy produced by the process, which makes sense. The net amount of heat energy that passes through a calorimeter, a device used to quantify the heat emitted by a chemical reaction, equals the opposite of the system's total energy change.Hence, all about exothermic and endothermic process.
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PLEASE HELP ME!!!!!
At what point does the mass have the most KINETIC ENERGY?
Answer: Kinetic energy is highest when the velocity is the highest.
Explanation:
Calcium chloride can be made by reacting calcium carbonate with hydrochloric acid. CaCO3(s) + 2HCl(aq) → CaCl₂(aq) + H₂O(l) + CO₂(g) An excess of calcium carbonate was added to 50.0 cm³ of 0.500 mol/dm³ hydrochloric acid. The solution was filtered to remove the excess calcium carbonate. (a) How many moles of HC1 were used in this reaction? (b) Deduce the number of moles of carbon dioxide gas made in this reaction. (c) Calculate the mass of carbon dioxide made in this reaction. (d) Calculate the volume, in dm³, of carbon dioxide made in this reaction at room temperature and pressure (r.t.p.). like to confirm B ans D. Is B 0.0125mol? Is D 24dm ³?
The mass of HCl is:
0.75×36.5/1000 ×25=0.684g.
1 mole of calcium carbonate reacts with 2 moles of HCl.
Hence, the mass of calcium carbonate that will react completely with 0.684 g of HCl is
100/2×36.5 ×0.684=0.937g.
What is mole?
Mole, symbol Mole is a unit of quantity of matter in the International System of Units (SI). Amount of matter is a measure of how much a given elementary unit of matter is contained in an object or sample. A mole is defined to contain exactly 6.02214076 × 1023 base units. Depending on the substance in question, the basic entities can be subatomic particles such as atoms, molecules, ions, ion pairs, or electrons. For example, 10 moles of water (a compound) and 10 moles of mercury (a chemical element) contain the same amount of matter, and mercury contains exactly one atom per molecule of water, The two volumes and masses are different.
The number of base units in one mole is known as Avogadro's number and represents the approximate number of nucleons (protons or neutrons) in one gram of ordinary matter. The previous definition of mole was the number of elemental units equal to 12 grams of carbon-12, the most common isotope of carbon.
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Place the following in order of increasing boiling point. C3H8, He, CH3OH, HOCH2OH, HC1
The order of increasing boiling points for the compounds is;
[tex]He < C_{3} H_{8} < CH_{3} OH < OHCH_{2} OH < HCl[/tex]
What is the boiling point?We know that the boiling point of the substance would depend on the kind of intermolecular forces that is existing in the substances. We know that the methanol and the glycol both have strong hydrogen bonds that is occurring in the molecule thus they would have a higher boiling point.
On the other hand, the helium, and the propane compounds only have the dispersion forces thus they would not be expected to have a high boiling point in the sequence.
This implies that helium would have the least boiling point since it contains only dispersion forces and has a low relative molecular mass while hydrogen chloride which has strong hydrogen bonds would have the highest boiling point.
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Please round answer to two decimal places
The percent composition of Ca in CaCl2 is ____ %
Consider one mole of CaCl₂ is given. The molar mass of CaCl₂ is 111 g/mol and mass of Ca is 40 g/mol. Thus, percent composition of Ca is 36.03 %.
What is percent composition?Percent composition of an element in a compound is the ratio of its mass in the compound to the total mass of the compound multiplied by 100.
Consider one mole of CaCl₂ is given. Atomic mass of Ca = 40 g/mol
atomic mass of Cl = 35.5 g/mol
2 moles of Cl = 35.5 × 2 = 71 g.
molar mass of CaCl₂ = 71 g + 40 g = 111 g/mol
The percent composition of Ca in one mole of CaCl₂ is:
= 40 g/ 111 g × 100
= 36.03%.
Therefore, the percent composition of Ca in one mole of CaCl₂ is 36.03 %.
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