it is chemical change because chemical change occur when bonds are broken or formed between molecules or atoms.
Which change happens when a substance melts? (1 point)
The molecules of the substance move farther apart, which pulls on the intermolecular bonds between them.
Heat energy forces the molecules of the substance farther apart until the rigid structure of the solid breaks.
Heat energy overcomes the forces of attraction between the molecules of the substance, so the molecules can move more
freely.
The vibration of the molecules produces enough heat to weaken the forces of attraction between the molecules of the
substance.
Answer:
The molecules of the substance move further apart which pulls on the intermolecular bonds between them
Explanation:
because it said it was right
How many molecules of o2 are produced from 82g of h2o?
2na2o2 +2h2o= o2 +4naoh
Answer:
857.2947
Explanation:
You start with what you’re given 82g of H20 and multiply by 1 mole and the actual grams of h20 which is 18.0 then you do the mole. 1 mol of O2 and 2 mol of H2O times 6.02 x 10^23
Three examples where is helpful to have a low reaction rate
Explanation:
combustion of fuels
digestion of food
cooking of food
It is easier to determine the electron configurations for the p-block elements in periods 1, 2, and 3 than to determine the electron configurations for the rest of the p-block elements in the periodic table because.
Answer:
See Explanation
Explanation:
Because you have to get through the d-block electron configurations for the rest of the p-block elements which is a hassle to do. You need to know how to account for electron stability, from which subshell to remove electrons, etc. because it is all weird for d-block.
How many moles are in 8.35 g of H2O?
(show all work)
Answer: 0.463 mol (to 3 sf)
Explanation:
The atomic mass of hydrogen is 1.00794 g/mol.The atomic mass of water is 15.9994 g/mol.So, the mass of water is 2(1.00794)+15.9994 = 18.01528 g/mol.
This means that in 8.35 grams of water, there are:
8.35/18.01528, which is 0.463 mol (to 3 sf)How is polypropylene commonly used?
The solubility of sodium hydrogen carbonate in water 20 degrees is 9.6 g/100 g h2o.
what is the mole fraction of nahco3 in a saturated solution?
what is the molality of the solution?
We can see from the details below that, the value of the solution's molality is 1.14 mol/Kg.
What is solubility?The term solubility has to do with the quantity of solute that is able to dissolve in a given quantity of solvent. We have the solubility of the sodium hydrogen carbonate in water at 20 degrees as 9.6 g/100 g h2o.
Number of moles of sodium hydrogen carbonate = 9.6 g/84 g/mol = 0.114 moles
Number of moles water = 100 g /18 g/mol = 5.55 moles
Mole fraction of sodium hydrogen carbonate is obtainable by the use of the relation;
0.114 moles/0.114 moles + 5.55 moles
= 0.02
Molality of the solution = 0.114 moles/0.1 Kg = 1.14 mol/Kg
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What happens when an electron absorbs photons? OA. It changes into a neutron and falls into the nucleus. B. It moves to a higher energy level. OC. It changes into an alpha particle and is ejected from the atom. OD. It falls to a lower energy level.
When an electron absorbs photons it moves to a higher energy level.
What happens when an electron absorbs photons?
Absorption of photons occurs when electrons in a given state absorb photons which causes them to gain energy and jump to higher energy levels.
The electrons will move to higher energy level because they have acquired more energy.
Thus, when an electron absorbs photons it moves to a higher energy level.
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what is the last letter letter that comes after this word in chemistry
the answer is Ethane
hope it helps...!!!
the answer is Ethane
hope it helps...!!!
V2 = (P1 × V1 × T2) (P2 × T1) A gas with a beginning pressure of 2 atm at a temperature of 300 K has a volume of 20 ml. What will be the new volume if the pressure increases to 4 atm and the temperature is lowered to 200 K?
6.6ml will be the new volume if the pressure increases to 4 atm and the temperature are lowered to 200 K.
What is an ideal gas equation?The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).
Given data:
[tex]V_1=20 ml[/tex]
[tex]T_1=3[/tex]
[tex]P_1=2 atm[/tex]
[tex]T_2=200 K[/tex]
[tex]P_2=4 atm[/tex]
[tex]V_2=?[/tex]
Using equation:
[tex]V_2 =[/tex] [tex]\frac{P_1 X V_1 XT_2}{P_2 X T_1}[/tex]
[tex]V_2 =[/tex][tex]\frac{2 atm X 20 ml X200 K}{4 atm X 300 K}[/tex]
[tex]V_2 = 6.6 ml[/tex]
Hence, 6.6ml will be the new volume if the pressure increases to 4 atm and the temperature are lowered to 200 K.
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what id the study of living things called
Answer:
biology
Explanation:
bi- means life and ology means study of
Name and Title:
Include your name, instructor's name, date, and name of lab.
Objectives(s):
In your own words, what is the purpose of this lab?
Hypothesis:
In this section, please include the predictions you developed during your lab activity. These statements reflect your predicted outcomes for the experiment.
Procedure:
The materials and procedures are listed in your virtual lab. You do not need to repeat them here. However, you should note if you experienced any errors or other factors that might affect your outcome. Using your summary questions at the end of your virtual lab activity, please clearly define the dependent and independent variables of the experiment.
Data:
Record the elements present in each unknown astronomical object. Be sure to indicate “yes” or “no” for each element.
Hydrogen Helium Lithium Sodium Carbon Nitrogen
Moon One
Moon Two
Planet One
Planet Two
Conclusion:
Your conclusion will include a summary of the lab results and an interpretation of the results. Please answer all questions in complete sentences using your own words.
Using two to three sentences, summarize what you investigated and observed in this lab.
Astronomers use a wide variety of technology to explore space and the electromagnetic spectrum; why do you believe it is essential to use many types of equipment when studying space?
If carbon was the most common element found in the moons and planets, what element is missing that would make them similar to Earth? Explain why. (Hint: Think about the carbon cycle.)
We know that the electromagnetic spectrum uses wavelengths and frequencies to determine a lot about outer space. How does it help us find out the make-up of stars?
Why might it be useful to determine the elements that a planet or moon is made up of?
Answer:
I don't no this answer do you know then telle
If 0.094 moles of magnesium react with excess oxygen, how many moles of magnesium oxide would be formed?
The equation for this reaction is
[tex]\text{Mg}+\text{O} \longrightarrow \text{MgO}[/tex]
This means that for every mole of magnesium consumed, 1 mole of magnesium oxide is produced.
So, the answer is 0.094 moles.
Assume that heating a 3.50g sample of the hydrate of copper (II) sulfate yields 2.10g of anhydrous copper (II) sulfate. What is the mass percent of water in the hydrate?
If a 3.50g sample of the hydrate of copper (II) sulfate is heated to yield 2.10g of anhydrous copper (II) sulfate, the mass percent of water in the hydrate is 40%.
How to calculate mass percent?The mass percent of hydrate in a sample can be calculated by dividing the mass of water in the sample by the mass of the hydrated compound.
According to this question, 3.50g sample of an hydrate of copper (II) sulfate is heated to yield 2.10g of anhydrous copper (II) sulfate. The mass percent of water is calculated as follows:
Mass percent of water = (3.5-2.1)/3.5 × 100
Mass percent of water = 40%
Therefore, if a 3.50g sample of the hydrate of copper (II) sulfate is heated to yield 2.10g of anhydrous copper (II) sulfate, the mass percent of water in the hydrate is 40%.
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According to the postulates of kinetic molecular theory, which statement describes the movement of the particles of a liquid?
According to the postulates of kinetic molecular theory, the particles of a liquid are close together and are in constant random motion.
What is the Kinetic theory of matter?The Kinetic theory of matter states that all forms of matter are made up of tiny particles which possess kinetic energy and are in constant state of motion.
The strength of the forces keeping the particles together determines the state in which that substance exists in.
For liquids, the intermolecular forces of attraction between between the molecules are not very strong, and as such, the particles of a liquid are in constant state of random motion.
Therefore, according to the postulates of kinetic molecular theory, the particles of a liquid are close together and are in constant random motion.
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Which of the following lists electromagnetic radiations from lowest to highest energy?
Your answer:
radio waves, microwaves, ultraviolet radiation, visible light
microwaves, radio waves, visible light, X-rays
radio waves, infrared radiation, visible light, ultraviolet radiation
gamma radiation, infrared radiation, visible light, X-rays
Answer:
Highest wavelength : radio waves
So lowest energy: radio waves
Hence order is:
radio waves < microwaves < IR waves < visible light < ultraviolet radiation < X-rays < gamma rays
You find that it takes 23 mL of 0.0150 M nitric acid to neutralize 18 mL of a barium
hydroxide solution. What is the molarity of the base ?
Answer: 0.02 M
Explanation:
[tex]M_{A}V_{A}=M_{B}V_{B}\\(23)(0.0150)=(18)M_{B}\\M_{B}=\frac{(23(0.0150)}{18} \approx \boxed{0.02 \text{ M}}[/tex]
how many moles are in 2.00g of beryllium chloride
Answer:
[tex]\huge\bold\color{pink}{- Magdonal -}[/tex]
[tex]\huge\red{\overline{\qquad\qquad\qquad\qquad}}[/tex]
[tex]\pink{\rule{1pt}{999999pt}}[/tex]
Answer:
.025 moles
Explanation:
Be Cl2 is beryllium chloride
Be = 9.0121 gm/mole
Cl = 35.45 gm mole
Be Cl2 = 79.91 gm/mole
2 gm / 79.91 gm/mole = .025 moles
Which of the following would be appropriate reason(s) for scientists to reject atomic theory?
evidence that John Dalton did not give credit to others who helped him develop the theory
evidence that some kinds of matter are made up of waves instead of particles
observations that cannot be explained by the theory
observations that are predicted by the theory
The appropriate reasons for scientists to reject atomic theory are :
Evidence that some kinds of matter are made up of waves instead of particles ( B )Observations that cannot be explained by the theory ( C )What is atomic theory ?
Atomic theory states that every material substance is composed of similar minute particles known as atoms which share the same properties. these particles ( atoms ) bound together to form a matter.
Matter is composed of particles ( atoms ) and not wave also certain observations that cannot be explained will lead to the discredit of the atomic theory.
Hence we can conclude that The appropriate reasons for scientists to reject atomic theory are : Evidence that some kinds of matter are made up of waves instead of particles and Observations that cannot be explained by the theory
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Write the formula for an isotope of oxygen with nine neutrons, including the mass number and the atomic number. Write the answer in the form XZA using the atomic symbol button in the toolbar, where A is the mass number, Z is the atomic number, and X is the chemical symbol for the unknown element.
The formula for an isotope of oxygen with nine neutrons, including the mass number and the atomic number is 17/8 O.
What is an isotope?Isotope is any of two or more forms of an element where the atoms have the same number of protons, but a different number of neutrons within their nuclei.
This means that atoms of isotopes will have the same atomic number but a different mass number.
According to this question, an isotope of oxygen has 9 neutrons. If oxygen has an atomic number of 8, the formula of this particular isotope is as follows: 17/8 O.
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How many atoms are contained in 100.0 g of mercury
3.00097 x [tex]10^{23}[/tex] atoms are contained in 100.0 g of mercury.
What is moles?The mole is defined as the amount of substance that contains as many elementary entities as there are atoms in exactly 12 g of carbon-12.”
Number of moles of mercury = [tex]\frac{mass}{molar \;mass}[/tex]
Number of moles of mercury = [tex]\frac{100.0 g}{200.59 u}[/tex]
= 0.4985 moles
Number of moles of mercury = Number of atoms = moles of Hg x [tex]6.02 X 10^{23}[/tex]
= 0.4985 x [tex]6.02 X 10^{23}[/tex]
= 3.00097 x [tex]10^{23}[/tex] atoms.
Hence, 3.00097 x [tex]10^{23}[/tex] atoms are contained in 100.0 g of mercury.
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Research some metal ores and what the extracted metals are used for?
(besides copper)
Lithium is used to build computer batteries, whereas iron is used in industry to construct buildings and bridges.
What are metals?In engineering, metals are characterized to have electrical conductivity and other properties (e.g., ductility, reflectivity, etc).
For example, Lithium can be defined as soft metal (alkali metal) that is suitable to store electrical energy.
In conclusion, Lithium is used to build computer batteries, whereas iron is used in industry to construct buildings and bridges.
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When balancing chemical equations the left hand side of the equation is known as the ______, while the right hand side is known as the ______.
Answer:1# reactants 2#coefficient
Explanation:
Find an example of an ester used as a fragrance or flavoring and give the name, condensed structural formula, and flavor of your chosen ester.
The example of an ester used as a fragrance is isopentyl acetate and it is present in banana. Details about esters can be found below.
What are esters?Esters are compounds most often formed by the condensation of an alcohol and an acid and has the functional group carbon-oxygen double bond joined via carbon to another oxygen atom.
Esters are naturally found in certain fruits and can be used as major constituent of perfumes. An example of ester used as fragrance is isopentyl acetate.
Isopentyl acetate has the molecular formula of C7H14O2 and has a banana flavor.
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What is the molarity of a solution in which 102 grams of aluminum oxide, Al2O3, is
dissolved in 500 mL of solution?
Answer:
2.00 M
Explanation:
The formula mass of aluminum oxide is 2(27)+3(16)=102 g/mol.
So, there is 1 mole of solute in 500 mL=0.5 L of solution
Now, we can use the equation molarity = (moles of solute)/(liters of solution)
molarity = 1/0.5 = 2.00 MCan anyone please help me find molar masses of compounds. For example Copper (ll) sulfate (CuSO4)
Answer:
Explanation:
You would have to add up the atomic masses of all the compounds in the compound, making sure you include how many molecules of each are in the compound
For example, in CuSOA we have 1 molecule of Cu and S, as 4 molecules of O
The atomic masses are as follows:
Cu = 63.55 u
S = 32.065 u
O = 15.99 units
This is how we would add it up:
(Atomic mass of Cu) + (Atomic mass of S) + 4(Atomic Mass of O)
(63.55) + (32.065) + 4(15.99)
(63.55) + (32.065) + 63.96
= 159.575 u
Which branch of chemistry would study how pollution effects marine life?
Answer: Environmental chemistry
Explanation:
Which is a characteristic of nuclear fission?
Balancing Equations?
CrO3 → Cr₂O3 +0₂
Answer:
2CrO3→Cr₂O3 +0₂
Explanation:
that's the correct balancing
Balance the following equation.
[tex] \small\sf{ CrO_{3} → Cr_{2}O_{3} + O_{2}}[/tex]
Explanation -:[tex] \underline{ \boxed{ \small\frak{ Law \: of \: conservation \: of \: mass}}}[/tex]
The law of conservation of mass was put forward by Antoine Laurent Lavoisier. Law of conservation of mass states that matter is neither created nor destroyed during a chemical reaction. This means that there is no change in mass during a chemical reaction.
[tex] \small\sf{ CrO_{3} → Cr_{2}O_{3} + O_{2}}[/tex]
Word equation
[tex] \small\mathbb{ Chromium \: Trioxide = Dichromium \: Trioxide + Dioxygen}[/tex]
Reactant :
Chromium Trioxide = CrO3
Product :
Dichromium Trioxide + Dioxygen = Cr2O3 + O2
Balanced equation.
[tex] \small\sf{4CrO_{3} = 2Cr_{2}O_{3} + 3O_{2}} [/tex]
Wax is a nonpolar substance, but the surface of a piece of glass is polar. Based on your observations from part E, which substance is water more attracted to, polar substances or nonpolar substances? Does this finding agree with your observations from part C?
Based on the observations from, the substance that water is more attracted to are polar substances.
What is the Polarity of water?
Water is a compound made up of 2 atoms of hydrogen and 1 atom of oxygen.
Water molecule is polar due to the unequal sharing of electrons between the atoms and the unsymmetrical shape of the molecule.
Since water molecules are polar, they are more attracted to molecules that are also polar.
Thus, based on the observations from, the substance that water is more attracted to are polar substances.
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