The question requires us to determine the molecular mass of the compound thorium sulfate (Th(SO4)2), considering the atomic masses to the tenth of a gram.
The atomic masses of the elements present in the molecule given are:
Th: 232.0 u
S: 32.1 u
O: 16.0 u
To obtain the molecular mass of the compound, we must consider the number of atoms of each element: there are 8 oxygen (O) atoms, 2 sulfur (S) atoms and 1 thorium (Th) atom, therefore we calculate the mass as:
molecular mass Th(SO4)2 = (1 * 232.0) + (2 * 32.1) + (8 * 16.0) = 424.2 g/mol
Therefore, the molecular mass of Th(SO4)2 is 424.2 g/mol.
Samples of two metals of equal mass but with different heat capacities are originally at the same temperature. Il the same amounto1'heat is added to both samples, for which metal will the final temperature be lower (assume that no phase change, such as meltng, occurs).
The heat capacity corresponds to the energy needed to raise one degree of temperature for one gram of substance. That is, the greater the heat capacity, for the same mass, the greater the energy required to raise the temperature of the material.
Therefore, between the two metals with the same mass, the same initial temperature, and the same heat added, we can say that the one with the higher heat capacity will present a lower final temperature.
i need help on question 2For each of the reactions below, write the (i)equilibrium constant expression, (ii) find its value,and (iii) determine if it’s reactant-favored, product-favored, or neither.(a) N 2 (g) + 3 H 2 (g) -----> 2 NH 3 (g)[N 2 ]eq = 1.50 M [H 2 ]eq = 2.00 M[NH 3 ]eq = 0.01 M(b)HF(aq) -----> H + (aq) + F – (aq)[HF] eq = 0.55 M [H + ] eq = 0.001 M[F – ] eq = 0.001 M(c) Fe 3+ (aq) + SCN – (aq) -----> FeSCN 2+ (aq)[Fe 3+ ] eq = 0.55 M [SCN – ] eq = 0.001M[FeSCN 2+ ] eq = 0.001 M
Answer
Explanation
Part A
Given:
a) N₂ (g) + 3H₂ (g) -----> 2NH₃ (g)
[N₂ ]eq = 1.50 M, [H₂ ]eq = 2.00 M, [NH 3 ]eq = 0.01 M
Solution:
i. The equilibrium constant expression for the reaction is
[tex]Kc=\frac{[NH_3]^2}{[N_2][H_2]^3}[/tex]1. Which of the following elements are metals, nonmetals and metalloids?
As, Xe, Fe, Li, B, Cl, Ba, P, I, Si.
Answer:
Aluminium, Thorium, Barium and Strontium. Nonmetals will be : Fluorine, Phosphorus and Krypton. Metalloids will be : Gallium and Tellurium.
Consider the reaction below Which species is/are) the Bronsnsted-Lowry base(s)?HCO₃⁻ (aq) + F⁻ (aq) = CO₃²⁻ (aq) + HF (aq)A) F-,HFB) HCO3-, F-C) CO32-, HFD) CO32-, F-
Answer
D) CO₃²⁻, F⁻
Explanation
A Brønsted-Lowry acid is a compound that supplies a hydrogen ion in a reaction. A Brønsted-Lowry base, conversely, is a compound that accepts a hydrogen ion in a reaction. Thus, the Brønsted-Lowry definitions of an acid and a base focus on the movement of hydrogen ions in a reaction, rather than on the production of hydrogen ions and hydroxide ions in an aqueous solution.
HCO₃⁻ (aq) + F⁻ (aq) = CO₃²⁻ (aq) + HF (aq)
Therefore, in the reaction above, the species that is/are Bronsnsted-Lowry base(s) are CO₃²⁻ and F⁻
Thus, the correct answer is: D) CO₃²⁻, F⁻
Which of the following are SI units? Select all that apply.gLs
INFORMATION:
We have the following options
g
L
s
And we must select the options that are SI units.
STEP BY STEP EXPLANATION:
The SI units are:
- For mass: Kg
- For volume: cm^3
- For time: s
- For length: m
Finally, we can see that from given options, s is the unique that belongs to the SI units.
ANSWER:
s
Density
Which of the following do you think is more dense?
Water
Ping Pong Ball
Which is more dense a drop of water or ping pong ball
A drop of water is denser than a ping-pong ball.
Usually, water is made of particles that are firmly pressed together. In differentiation, plastic (the material ping pong balls are made of) may be a lightweight fabric and the particles are not as firmly stuffed together.
The thickness of a ping pong ball is 0.0840 g/cm³, though water’s thickness is 997 kg/m³. Subsequently, ping pong balls aren’t about as thick as water and will continuously coast and surface greatly quickly.
The ping pong ball appears to oppose gravity and coast within the air.
Ping-pong balls drift within the water since they are amazingly lightweight, empty, and filled with air. Too, the water’s surface pressure makes it simple for the ping pong ball to drift.
In expansion, water is denser than ping pong balls, making them look for the most noteworthy point of water.
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.A voltaic cell consists of a Ni electrode in 1.0M Ni(NO3
)2
and an Fe electrode
in 1.0M Fe(NO3
)2
.
Calculate E°
cell for the spontaneous cell reaction at 25°C
The standard electrode potential value of a cell can be calculated from the reduction potentials of the electrodes. The standard electrode potential E⁰ of the voltaic cell with Ni electrode and iron electrode is 0.19 V.
What is standard electrode potential?The reduction potential of an electrode at standard conditions that is at 298 K and 1 bar pressure is called standard electrode potential.
There are two types of electrodes in a cell called cathode and anode. Cathode is the electrode at which reduction occur where as the electrode which undergo oxidation is called anode.
The standard electrode potential of a cell can be measured as follows.
[tex]E^{0} _{cell} = E^{0} _{cathode} - E^{0} _{anode}[/tex]
Here, the anode is Fe electrode with a standard electrode potential of -0.44 V and the anode is Ni electrode having -0.25 V reduction potential.
Thus the standard electrode potential of the voltaic cell can be calculated as follows:
[tex]E^{0} _{cell} = E^{0} _{Ni^{2+}/Ni} = E^{0} _{Fe/Fe^ {2+}}[/tex]
= (-0.25 v) - (-0.44 v)
= 0.19 V.
Hence, the standard electrode potential of the cell E⁰ containing Ni electrode and Fe electrode is 0.19 V.
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Answer question number 3. The question is in the image.
ANSWER
Octyne
EXPLANATION
Generally, an organic compound that has triple bond is called alkyne
The general formula for alkyne compound is given below as
[tex]\text{ C}_nH_{2n}[/tex]Where n is the number of carbon atom
[tex]\begin{gathered} \text{ n = 8} \\ \text{ C}_8H_{2\times8} \\ \text{ C}_8H_{16} \end{gathered}[/tex]Therefore, the answer is octyne
Determine whether the bond between each of the following pairs of atoms is purely covalent, polar covalent, or ionic.
- I and Cl
-C and O
- Ca and F
- P and P
The kind of bonds that can be formed between each of the atoms is;
I and Cl - ionic bondC and O - polar covalent bond Ca and F - ionic bond P and P - covalent bondWhat is the Ionic bond?The ionic bond is the kind of bond that is formed between two atoms in a compound when there is a complete transfer of electrons between the atoms in the compound.
A covalent bond is said to be formed between two atoms when there is a sharing of the electrons that can be found between two atoms. We know that a bond is ionic when the difference in the electronegativity of the atoms is high.
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Given the system at equilibrium: N2O4(g) + 58.1 kJ <----> 2 NO2(g) What will be the result of an increase in temperature at constant pressure?D) The equilibrium will shift to the right, and the concentration of NO2(g) will increaseA) The equilibrium will shift to the left, and the concentration of NO2(g) will decrease. B) The equilibrium will shift to the left, and the concentration of NO2(g) will increase. C) The equilibrium will shift to the right, and the concentration of NO2(g) will decrease.
STEP-BY-STEP EXPLANATION:
Given information
[tex]N_2O_{4(g)}\text{ + 58.1KJ }\rightleftarrows2NO_{2(g)}[/tex]From the given reaction, you will see that energy is added to the reactant side. This implies that the reaction is an endothermic reaction.
An endothermic reaction is a type of reaction in which heat is absorbed from the surroundings.
Recall, Le Chatelier's principle states that when external constraints such as (temperature, pressure, and concentration) are imposed in a chemical equilibrium system, the equilibrium shift so as to annul or neutralize the effect of the constraints
When temperature is
What is the minimum temperature at which 59 g of NH4Cl would completely dissolve in 100 grams of water?
1) Identify the curve of the solute.
2) Look for the grams of solute in the vertical axis.
3) Go down looking for the temperature
The minimum temperature at which 59 g of NH4Cl would completely dissolve in 100 g H2O is 70ºC.
Please I need answer to this question
Answer:
What??
I dont understand the questii
How many valence electrons are in the outermost shell of all noble gases except helium?
Answer:
8
Explanation:
All noble gases have 8 electrons in their outermost shell and are in an octet state.
Of the molecules SiCl4 and SiI4 , which has bonds that are more polar?
The SiCl4 molecules' bonds will be more polar.
In a molecule, the difference in electronegativity between the atoms engaged in a bond determines its polarity. Iodine is not as electronegative as chlorine. As a result, the electrons in the Si-Cl bond will be localized more close to the Cl, giving the bond its polarity. Iodine is less electronegative than chlorine, hence it won't produce a Si-I bond that is highly polarized.
Tetrachlorosilane, often known as silicon tetrachloride, is an inorganic chemical having the formula SiCl4. It is an air-fuming, colorless volatile liquid. High purity silicon and silica are made using it for industrial applications.
The chemical compound with the formula SiI4 is called silicon tetraiodide. It is a tetrahedral molecule with 2.432 Si-I bonds. The silicon amides with the formula Si(NR2)4 are precursors to SiI4. Additionally, it has attracted attention in the production and etching of silicon for microelectronics.
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What ions are present in Fe(NO3)3 (aq) solutions?
Explanation:
Iron (III) nitrate is a soluble salt. When dissolved in water it will dissociate into its ions: Iron (III) and nitrate.
Fe(NO₃)₃ (aq) ----> Fe³⁺ (aq) + 3 NO₃⁻ (aq)
Answer: Fe³⁺ and NO₃⁻.
Calculate the molar mass of Na2CO3(in g/mol)
105.987. First we have to find the atomic mass of each atom of the molecule Na = 22.98977, C = 12.011 and O = 15.999. Since we have two atoms of Na the atomic mass of Na need be multiplied by 2, in case of carbon is 1 and 3 for oxigen and add them all together. 2x(22.98977) +1x(12.011) + 3x(15.999) = 105.987
Which of the following is an example of only a physical change? (1 point)Odry ice becoming vaporthe green color of the Statue of Libertythe creation of table saltO the smell of rotten eggs
Answer:
Dry ice becoming vapor.
Explanation:
In a physical change, the substance is the same, but in this case, it changes state from solid to vapor.
A 0.400M formic acid (HCOOH) solution freezes at −0.758∘C Calculate the Ka of the acid at that temperature. (Hint: Assume that molarity is equal to molality. Carry out your calculations to three significant figures and round off to two for Ka.)
First, find the molality of the solution.
[tex]i=\frac{T_f}{k_f\cdot m}[/tex]Where k is the molal freezing point, which is 1.86 C/m for water.
[tex]i=\frac{0.758}{1.86\cdot0.4}=\frac{0.758}{0.744}=1.02[/tex]The equilibrium constant Ka would be
[tex]K_a=\frac{\lbrack HCOO\rbrack\lbrack H\rbrack}{\lbrack HCOOH\rbrack}[/tex][tex]K_a=\frac{x\cdot x}{0.4-x}[/tex]Then, to find x.
[tex]\begin{gathered} i=\frac{0.4-x+x+x}{0.4}=1.02 \\ x=1.02\cdot0.4-0.4=0.008 \end{gathered}[/tex]Once we have x, we can obtain the constant Ka
[tex]K_a=\frac{(0.008)^2}{0.4-0.008}=\frac{6.4\times10^{-5}}{0.392}=1.6\times10^{-4}[/tex]Therefore, the constant Ka of the reaction is 1.6x10^-4.
I need help with solving this problem
Use the reaction below to determine how many liters of H2O(g) result when 2.7 grams of CH4 are combusted in excess oxygen. The temperature after combustion is 380K and the pressure is 1.5 atm.CH4(g) + 2O2(g) > CO2(g) + 2H2O(g)
1) Write the chemical equation.
[tex]CH_4+2O_2\rightarrow CO_2+2H_2O[/tex]2) List the known and unknown quantities.
Sample: 2.7 g CH4.
Temperature: 380 K.
Pressure: 1.5 atm.
3) Convert grams of CH4 to moles of CH4.
The molar mass of CH4 is 16.0425 g/mol.
[tex]mol\text{ }CH_4=2.7\text{ }g\text{ }CH_4*\frac{1\text{ }mol\text{ }CH_4}{16.0425\text{ }g\text{ }CH_4}=0.17\text{ }mol\text{ }CH_4[/tex]4) Moles of H2O produced from 0.17 mol CH4.
The molar ratio between CH4 and H2O is 1 mol CH4: 2 mol H2O.
[tex]mol\text{ }H_2O=0.17\text{ }CH_4*\frac{2\text{ }mol\text{ }H_2O}{1\text{ }mol\text{ }CH_4}=0.34\text{ }H_2O[/tex]5) Volume of H2O produced in the reaction.
5.1- List the known and unknown quantities.
Moles: 0.34 mol H2O.
Temperature: 380 K.
Pressure: 1.5 atm.
Ideal gas constant: 0.082057 L * atm * K^(-1) * mol^(-1)
5.2- Set the equation.
[tex]PV=nRT[/tex]5.3- Plug in the known values and solve for V (liters).
[tex](1.5\text{ }atm)*(V)=(0.34\text{ }mol\text{ }H_2O)*(0.082057\text{ }L*atm*K^{-1}*mol^{-1})*(380\text{ }K)[/tex][tex]V=\frac{(0.34\text{ }mol\text{ }H_2O)(0.082057\text{ }L*atm*K^{-1}*mol^{-1})(380\text{ }K)}{1.5\text{ }atm}[/tex][tex]V=7.1\text{ }L[/tex]7.1 L H2O was produced from 2.7 g CH4 in the reaction.
2.04 x 10^23 atoms of carbon to grams
Answer
Mass of carbon = 4.069 g
Explanation
Given:
Number of atoms = 2.04x10^23 atoms
Required: Mass of carbon
Solution
Step 1: Find the number of moles of carbon
1 mole = 6.022x10^23 atoms
x moles = 2.04x10^23 atoms
Solve for x
x = (2.04x10^23 atoms x 1 mole)/6.022x10^23 atoms
x = 0.339 mol
Step 2: From the moles, calculate the mass of carbon
m = n x M where m is the mass, n is the moles and M is the molar mass of carbon
m = 0.339 mol x 12,011 g/mol
m = 4.069 g
if you have 4.0 moles of nitrogen and 5.0 moles of hydrogen, what is the maximum amount of ammonia that you can produce?
Answer:
Explanation:
Here, we want to get the maximum amount of ammonia that can be produced
From the question, we have it that:
1 mole nitrogen gave 2 moles ammonia
Thus:
4 mole nitrogen will give 8 moles ammonia
Furthermore:
3 moles of hydrogen gave 2 moles of ammonia
5 moles of hydrogen will give:
[tex]\frac{5\times2}{3}\text{ = }\frac{10}{3}[/tex]The maximum amount of ammonia that can be produced is thus 8.0 moles
How do u do question 1b. Explain fully because i only got one mark from my answer here:Nonmetals will not conduct electricity on their own, but nonmetals from group 7 are very electronegative, and they are very likely to make bonds with metals from group 1 and 2, and these bonds will likely be ionic bonds, in which we have ions involved, and this is the case when we have conductivity, so if Bromine form a bond with metals, it will make ions and these ions when dissociated in a solution will cause the solution to conduct electricity.
A) The melting and boiling point of a compound depends on the elements, the bonds that form the molecule, and the geometry of the compound, so two compounds with a similar structure can have similar melting and boiling points.
Fluorethane has the molecular formula C2H5F, so poly(fluoroethane) may have a similar boiling point since its structure is similar.
B) This is because when a bond is formed, the chemical and physical properties of the compound change because there is a rearrangement of the electrons. So all the compounds that contain bromine will not have the same properties but it will depend on the elements with which they are linked and the type of link between them. If bromine bonds with an element with low electronegativity, such as a metal, for example, an ionic bond will be formed. This ionic bond with metal will give it different electrical properties and this compound can conduct electricity.
How many molecules of n2o4 are in 76.3 g n2o4 ? The molecular mass of n2o4 is 92.02g/mol
What Mass of Lithium nitrate would have to be dissolved in 30.0g of water in order to make an 18%. Solution?
The mass of lithium nitrate that needs to de dissolved in 30.0g of water in order to make 18% solution is 6.58 grams.
The Percentage Concentration of a solution is the calculation of concentration of an element in a solution using the masses of solute/solvent and solution. It can be defined by the formula:
=> Percentage = (Mass of solute/Mass of solution)*100
The density of water is 1 gm/cm³, so the mass of 30.0g of water is 30ml. 18% concentration is given. The formula for percentage of concentration is given as
Percentage = (Mass of solute/Mass of solution) × 100
Here, Mass of solute is m, Mass of solution is m+30, and percentage is 18, So we get
=> 18 = (mass of solute/Mass of solution) × 100
=> 18 = (m/m+30)*100
=> 18(m+30) = m
=> 18m + 540 = 100m
=> 82m = 540
=> m = 6.58
Hence, the mass of lithium nitrate dissolved in 30g water to make 18% solution is 6.58g.
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When radium-226 experiences alpha decay, the relative mass of the particle released in amu is
Energy of a photon is equal to 4.655 (4.44 + 0.08).
=0.135MeV=135KeV
Nature contains the radioactive element Ra-226. In 1898, Pierre and Marie Curie were working with uranium ore when they made the discovery of radium.
Uranium-238 undergoes radioactive decay, resulting in Ra-226.
A light paint was also created by combining radium-226 with fluorescent zinc sulfide. During and after World War I, this luminescent paint was employed to decorate watches, compasses, and other equipment.
High radium levels can result in cancer (particularly bone cancer), anemia, a blood issue, shattered teeth and cavities, and cataracts, growths in the eyes.
Some of these medical issues take years to manifest. The majority are brought on by gamma radiation, which can spread widely through the atmosphere.
The mineral uraninite contains the highest concentrations of radium 226 in nature, while it can be found in different proportions in almost all types of rocks and soils that contain naturally occurring uranium.
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Where is visible light located on the EM spectrum?A. Right in the middleB. It isn’t on the EM spectrumC. All the way to the rightD. All the way to the left
explanation - Visible light sits in the region with ultraviolet (UV) to the left of the spectrum.
see picture below :
• The picture shows exactly where the visible light is located in the electromagnetic spectrum .
• That is to the left of the ultraviolet radiation, and to the right of infrared (IR).
Conversion factors can be generated based on a balanced chemical reaction. For the
reaction below, identify which conversion factor (equality) is not valid:
C(s) + O2(g) → CO2(g)
A: 1 mole CO₂ = 1 mole C
B: 1 mole CO₂ = 1 mole O2
C: 1 mole C = 1 mole O2
D: 2 moles O₂ = 1 mole CO2
Answer:
D
Explanation:
D. Since CO2 is the only product, all the oxygen has to be converted into the form of CO2.
Let's pretend for a minute that the equation is:
aC + 2O2 -> CO2 where a is a certain number.
There would be no way of balancing this equation because the amount of oxygen on the left would always be twice of that on the right.
Please I need answer to my question
Calcium carbonate (CaCO3) is not an organic substance since it only contains one of the two elements—carbon or hydrogen.
To identify whether a compound is organic, it is important to check:
if the compound contains carbon, hydrogen, and other non-metals altogetherthere should be no metal in the compoundIf a compound contains one of two elements, that is Carbon or Hydrogen, then it is not an organic compound.
Carbohydrates are a common type of organic compound. Carbohydrates contain the chemical formula (CH2O)n.
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Please HELP!!!?! Describe competitive and noncompetitive in inhibitors describe how mutations can lead to resistance with non-competitive inhibitors
A competitive inhibitor physically mimics the substrate for a specific enzyme and engages in binding competition with the substrate at the enzyme's active site.
A noncompetitive inhibitor can bind to either the free enzyme or the enzyme-substrate complex and binds at a location different from the active site.
What are inhibitors that are competitive and noncompetitive? How do they function?The substrate cannot attach to the active site because the competitive inhibitor is bound there. The noncompetitive inhibitor attaches to a different spot on the enzyme.
The inhibitor binds at an allosteric location apart from the active site of substrate binding in noncompetitive inhibition. Therefore, in noncompetitive inhibition, the inhibitor can attach to its target enzyme even if a bound substrate is present.
Inhibitors that are non-competitive can bind to both the enzyme and the enzyme-substrate complex. Uncompetitive inhibitors only bind to the complex of the enzyme and substrate.
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