Answer:
The lattice energy increases as cations get smaller, as shown by LiF and KF.
Explanation:
Lattice energy is the change in internal energy that accompanies the formation of one mole of the solid from its constituent gas phase ions at 0 K. In calculating the lattice energy, we assume an electrostatic model where the ions are regarded as point charges.
The size of the ions determines the magnitude of the lattice energy. If the anion is the same, then the magnitude of the lattice energy depends on the the size of the cation, the smaller the cation the greater the lattice energy.
Since Li^+ is smaller than K^+, it is expected that LiF will have a greater lattice energy than KF, hence the answer.
The statement about crystal lattice energy that is supported by the information in the table is A. The lattice energy increases as cations get smaller, as shown by LiF and KF.
It should be noted that lattice energy simply means the change in internal energy that occurs after the formation of one mole of the solid from its constituent gas phase ions.
The magnitude of the lattice energy is determined by the size of the ions. From the table, the lattice energy increases as cations get smaller, as shown by LiF and KF.
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Calculate the heat of reaction, ∆H°, for the following:
3FeCl2(s) + 4H2O(g) Fe3O4(s) + 6HCl(g) + H2(g)
Answer:
562.76 kJ
Explanation:
∆H° (kJ) is the total of the heats of formation of the products minus the total of the heats of formation of the reactants.
NB: look up the heats of formation of the compounds in the heats of formation reference tables, it is found at the back of most chemistry text
heats of formation of the products (i.e. Fe₃O₄(s) , 6HCl(g) , H₂(g) ) = -1120.9 + 6(-92.3)+ 0 = -1674.7 kJ
heats of formation of the reactants (i.e. 3FeCl₂(s) , 4H₂O(g) ) =3(-423.42) + 4(-241.8) = -2237.46kJ
∆H° = -1674.7 kJ - (-2237.46kJ) =562.76 kJ
Pretend that unbinilium has an atomic mass of 299.01 amu. It is a group 2A element.
In the future, a local scientist reports that they have successfully synthesized 0.0295 moles of unbinilium. How many grams of unbinilium is this?
Do not enter units.
Answer:
8.82g
Explanation:
At a certain temperature, Ke = 3 for the reaction NO3(g) NO(g) + O2(g) Find the direction of thereaction if at some point in time in a 1.0 vessel the following respective concentrations were measured; [NO] = 2.0 mol/L, [O2] = 1.0 mol/L and NO3(g) = 0.75 mol/L.
10) A hydrobromic acid (HBr) solution has a molar concentration of 0.0085 M. Calculate the
[H3O+], [OH-] and pH of the solution.
Answer:
Explanation:
To find the [H3O+] of the solution, we can use the fact that HBr is a strong acid and completely dissociates in water. Therefore, the concentration of H3O+ is equal to the molar concentration of HBr:
[H3O+] = 0.0085 M
To find the [OH-], we can use the equation:
Kw = [H3O+][OH-]
Where Kw is the ion product constant for water, which has a value of 1.0 x 10^-14 at 25°C.
Rearranging the equation to solve for [OH-], we get:
[OH-] = Kw / [H3O+]
[OH-] = (1.0 x 10^-14) / (0.0085)
[OH-] = 1.176 x 10^-12 M
To find the pH of the solution, we can use the equation:
pH = -log[H3O+]
pH = -log(0.0085)
pH = 2.07
Therefore, the [H3O+] of the solution is 0.0085 M, the [OH-] is 1.176 x 10^-12 M, and the pH is 2.07.
Explain the difference between the way a molecule (which does not ionize) dissolves and an ionic compound dissolves, using sugar water and salt water as an example
Answer:
The molecules (which do not ionize) dissolves in water depends on the polarity of molecules while the ionic compounds that dissolve in water depend on the electric charge of the compound.
For example sugar dissolves in water because of the polar nature of sugar which releases energy and form intermolecular bonds with the polar water molecules.
While salt dissolves in water as salt has a net electric charge that attracted by the oppositely charged ions present in the water. The attractive force between salt and water is stronger than sodium and chloride and allow salt to dissolve in the water.
What is the shape of a molecule of CH4?
O A. Trigonal-bipyramidal
O B. Bent
O C. Trigonal-pyramidal
O D. Tetrahedral
Answer:
D. Tetrahedral
Explanation:
the reason is because four electron pairs are distributed.
The pH of a substance can only be determined when it is
a) dried in a powder
b) frozen
c) dissolved in water
d) heated
The pH of a substance can only be determined when it is frozen. Hence, option B is correct.
What is pH?pH stands for Hydrogen potentials.
The use of the pH scale is one practical way of quantitatively determining how acidic something is.
If the pH of a solution is less than 7, it is acidic. If the pH is 7, the solution is neutral and if the pH is greater than 7,the solution is basic.
The pH of a substance can only be determined when it is frozen. Hence, option B is correct.
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In order from left to right, what are the coefficients (front numbers) needed to
balance the following equation? CzH6 + O2- CO2 + H20*
Answer:
10CH6 + 10O2 → 10CO2 + 3H20
Explanation:
A 13.00 g sample of citric acid reacts with an excess of baking soda as shown in the equation.
H3C6H507+3NaHCO3->3CO2+3H20+Na3C6H507
What is the theoretical yield of carbon dioxide? 0.993 g 2.98 g 3.65 g 8.93 g
Answer:2.98
Explanation:
Answer:
D) 8.93 g
Explanation:
Calculate the volume in liters of a 0.00183g / L mercury(1) chloride solution that contains 125 mg of (Hg 2 Cl 2 ) .
Answer: 68.3L
Explanation:
Density = Mass / Volume
Density = 0.00183 g/L
Mass = 125 mg = 0.125g
Volume = Mass / Density = 68.3L
plz help!!!!!!
This equation for the reaction when solid magnesium and solid lead (II) oxide are heated together is:
Mg(s)+Pb(s) => MgO(s)+Pb(s)
a)what does tell you about the position of lead in the reactivity series? explain your answer.
b)rewrite equation as an ionic equation
this shows that magnesium is higher in the reactivity series than lead.
I don't think there can be an ionic equation written because both components are in solid form and neither is in an aqeuos state.
Reactivity series is the progression of the metals based on the activity. In a reaction between magnesium and lead (II) oxide, it can be said that lead is at a lower position in the reactivity series.
What is reactivity series?Reactivity series is the depiction of the metals in a decreasing order based on their ability to displace the other metal in the reaction. More reactive species are placed at the upper position, while the less reactive species are placed at the lower positions.
In the series, magnesium is placed at the upper part of the series and has high reactivity, whereas lead is placed at the lower level with low reactivity. hence, in the reaction, Mg replaces Pb and forms a bond with oxygen.
The reaction between magnesium and lead (II) oxide cannot be written in the ionic form as all the reactants and the products are in the solid state and not in an aqueous state.
Therefore, lead is at a lower level of reactivity series.
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Plants can only
cause mechanical weathering.
Please select the best answer from the choices provided
OT
OF
Answer:
Ice wedging, pressure release, plant root growth, and abrasion can all cause mechanical weathering. in the cracks and pores of rocks, the force of its expansion is strong enough to split the rocks apart. This process, which is called ice wedging, can break up huge boulders.
Answer:
f
Explanation:
When dissolved in water, an acid or a base breaks down into a proton and an electron. two negative ions. a positive and a negative ion. a positive ion and a proton.
Answer:
got c
Explanation:
When dissolved in water, an acid or a base breaks down into a positive and a negative ion.
What is an acid-base reactions?
An acid–base reaction is a chemical reaction that occurs between an acid and a base. Acid-base reactions can be used to determine pH.
When dissolved in water, acids donate hydrogen ions (H+). Hydrogen ions are hydrogen atoms that have lost an electron and now have just a proton, giving them a positive electrical charge, whereas, bases, when dissolved in water yield hydroxide ions (OH-).
If a solution has a high concentration of H+ ions, then it is acidic whereas the solution having high concentration of OH- ions, called as basic.
Thus, from above , it is clear that when dissolved in water, an acid or a base breaks down into a positive and a negative ion.
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In this lab procedure, the ___ variable is the number of half-life cycles (time) and the ___ variable is the number (or fraction) of (radioactive) Lincolnium nuclei remaining at that time.
Answer:
Independent, Dependent
Explanation:
In the given lab procedure, the number of half-life cycles or the time in which the number of nuclei in radio-active substance turns into its half would be characterized as the 'independent' variable as it directly affects the dependent variable i.e. 'the number(or fraction) of Lincolnium nuclei remaining at that time.' The number of nuclei would be the dependent variable as it bears the change or effect of a change in the independent variable(half-life cycle).
Answer:
Its independent and dependent
Explanation:
On Edge 2021
Determine the [H+] or [OH−] for each of a solutions at 25°C.
Solution B: [H3O+] = 9.99 x 10^-9 M
Solution B: [OH-] = ?
Solution C: [H3O+] = 0.000777 M
Solution C: [OH-] = ?
Answer:
Solution B: [OH-] = 1×10^–6 M
Solution C: [OH-] = 1×10^–6 M
Explanation:
Solution B:
Hydronium ion concentration, [H3O+] = 9.99×10^–9 M
Hydroxide ion concentration, [OH-] = ?
The Hydroxide ion concentration, [OH-] can be obtained as follow:
[H3O+] × [OH-] = 1×10^–14
9.99×10^–9 × [OH-] = 1×10^–14
Divide both side by 9.99×10^–9
[OH-] = 1×10^–14 / 9.99×10^–9
[OH-] = 1×10^–6 M
Therefore, the Hydroxide ion concentration, [OH-] is 1×10^–6 M
Solution C:
Hydronium ion concentration, [H3O+] = 0.000777 M
Hydroxide ion concentration, [OH-] = ?
The Hydroxide ion concentration, [OH-] can be obtained as follow:
[H3O+] × [OH-] = 1×10^–14
0.000777 × [OH-] = 1×10^–14
Divide both side by 0.000777
[OH-] = 1×10^–14 / 0.000777
[OH-] = 1.29×10^–11 M
Therefore, the Hydroxide ion concentration, [OH-] is 1.29×10^–11 M
The overall process of photosynthesis has the balanced chemical equation 6CO, +6H,0 CH.0, 60, What does this tell you about the relative amounts of carbon
dioxide and water consumed in this process?
A. For every six moles of carbon dioxide consumed, one mole of water is consumed
B. For every mole of carbon dioxide consumed, one mole of water is consumed
C. For every gram of carbon dioxide consumed, one gram of water is consumed
D. For every six grams of carbon dioxide consumed, one gram of water is consumed.
Answer:
(C)
Explanation:
Because of the physics of it.
According to the overall equation of photosynthesis as follows: 6CO2 + 6H2O = C6H12O6 + 6O2, for every mole of carbon dioxide consumed, one mole of water is consumed.
What is photosynthesis?Photosynthesis is the process by which plants and other photoautotrophs convert light energy into chemical energy.
Photosynthesis makes use of carbon dioxide and water to produce glucose and oxygen as follows:
6CO2 + 6H2O = C6H12O6 + 6O2
This chemical equation suggests that for every mole of carbon dioxide consumed, one mole of water is consumed.
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How many grams of NO are produced from 15.8 g of H2O
Answer:
26.33 g of NO.
Explanation:
We'll begin by writing the balanced equation to produce NO from H2O. This is given below:
5N2 + 6H2O —> 4NH3 + 6NO
Next, we shall determine the mass of H2O that reacted and the mass of NO produced from the balanced equation. This is illustrated below:
Molar mass of H2O = (2x1) + 16 = 18 g/mol
Mass of H2O from the balanced equation = 6 x 18 = 108 g
Molar mass of NO = 14 + 16 = 30 g/mol
Mass of NO from the balanced equation = 6 x 30 = 180 g
From the balanced equation above,
108 g of H2O reacted to produce 180 g of NO.
Finally, we shall determine the mass of NO produced by the reaction of 15.8 g of H2O.
This is illustrated below:
From the balanced equation above,
108 g of H2O reacted to produce 180 g of NO.
Therefore, 15.8 g of H2O will react to produce = (15.8 x 180)/108 = 26.33 g of NO.
Therefore, 26.33 g of NO were obtained from the reaction.
How is alchemy different from modern chemistry?
O A. Alchemy experiments only with living things, and chemistry uses
chemicals
O B. Alchemy was practiced before Aristotle, and chemistry has been
popular since his death.
C. Alchemy is not scientific, but chemistry is based on evidence.
O D. Alchemy covers all areas of science, but chemistry covers only
matter.
Answer:
C. Alchemy is not scientific, but chemistry is based on evidence.
Explanation:
Alchemy was based on mystical beliefs instead of the scientific method.
Chemistry is the study of matter and change based on evidence.
How many Liters of 18 M H2SO4 are needed to make 0.5 L of 1.5 M H2SO4
Answer:
0.04 L
Explanation:
The following data were obtained from the question:
Concentration of stock solution (C1) = 18M
Volume of stock solution needed (V1) =?
Concentration of diluted solution (C2) = 1.5M
Volume of diluted solution (V2) = 0.5L
The volume of the stock solution needed can be obtain by using the dilution formula.
This is illustrated below:
C1V1 = C2V2
18 x V1 = 1.5 x 0.5
Divide both side by 18
V1 = (1.5 x 0.5)/18
V1 = 0.04L
Therefore, the volume of the stock solution needed is 0.04L.
hello:) I’m a little confused because the textbook says it forms water but the notes from my school says that it forms salt and water :/
Answer:
Yes, it form Salt and Water
In the equation 2KCIO3 → 2KCI + 302, how many moles of oxygen are produced when 12.61 mol of
KCIO3 decompose completely?
Select one:
O a. 19
Ob. 8.4
O c. 6.3
O d. 13
PLEASE I AM BEGGING PLEASE HELP ME
Answer:
A 19
Explanation:
2 mole of KClO3 produces 3 mole of O3
2 : 3
1 : 3/2
12.61 : 3/2 × 12.61
12.61 : 18.9
12.61 mole of KClO3 produces 18.9mole of O2.
SERE
What type of energy is the sum of an object's potential and kinetic energy?
mechanical energy
electromagnetic energy
chemical energy
thermal enemy
Answer:
Mechanical energy
Answer:
Mechanical Energy
Explanation:
The mechanical energy is the sum of the objects potential energy (energy the object possess due to its position) and its kinetic energy (energy the object possess due to its motion). Adding this two energies together, gives the total mechanical energy.
I really need help!!!
look at the three chemical equations below. How many atoms of each element are in reactants? How many atoms of each element are in the products?
2H2 + O2➔ 2H2O
2Fe203➔ 4Fe+ 3O2
CI2+ 2NaBr➔ 2NaCI+ Br2
1. Give IUPAC for the following compound
Answer:
Ethane
Explanation:
Find the 5 number summary for the number of chapters in the Old Testament. (Recall that the 5-number summary is the minimum, lower quartile, median, upper quartile, and maximum.)
Hey, I am doing this project right now too. Did you end up figuring out the answer to this? I do not understand this at all. Message me back pls!
In what way does the shape of a molecule affect how the molecule is involved with living systems?
A. It determines the weight of a molecule
B. it determines what elements are in a molecule
C. it determines oxidation states present in a molecule
D. it determines how the molecule functions
There are two characteristics of molecules, one is geometry and other is shape. Shape is excluding lone pair surrounding the central element and geometry is including the lone pair. Therefore, the correct option is option D.
What is VSEPR theory?VSEPR stands for valence shell electron pair repulsions. VSEPR theory is used to predict the shape and geometry of molecules on the basis of valence electrons pairs that are present around the central element of the molecule.
According to VSEPR theory, Lone pair lone pair repulsion is greater than bond pair bond pair repulsion. There are so many limitations of VSEPR theory. There is a repulsion between bond pair electrons and lone pairs present on the central element. The shape of a molecule affect how the molecule is involved with living systems as it determines how the molecule functions.
Therefore, the correct option is option D.
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A reversible reaction has an equilibrium constant of 0.75. If the forward rate constant is 0.62 mol/L/s, what's the reverse reaction rate constant?
A. 0.910
B. 0.827
C. 1.010
D. 1.210
Answer: B.) 0.827
Explanation:
Given the following :
Equilibrium constant (k) = 0.75
Forward rate constant = 0.62 mol/L/s
Backward rate constant =?
The equilibrium constant denited as 'k' is the proportion of the forward rate constant and the reverse rate constant.
Mathematically,
K = [forward rate constant / Reverse rate constant]
k = 0.75 ; forward rate constant = 0. 62mol/L/s
0.75 = [ 0.62mol/L/s ÷ reverse rate constant]
Reverse rate constant * 0.75 = 0.62mol/L/s
Reverse rate constant = (0.62mol/L/s ÷ 0.75)
Reverse rate constant = 0.8266mol/L/s
Reverse rate constant = 0.827mol / L/s
Answer:
0.827
Explanation:
Like DNA, RNA contains four nitrogenous bases.
Three of them are the same as those found in
DNA. The one that is different is called
The five-carbon sugar in RNA is called
Answer:
Uracil, Ribose
Explanation:
The Nitrogenous base found in RNA that is not found in DNA is called Uracil.
While the five-carbon sugar in RNA is called Ribose.
Answer:
Uracil and then Ribose
Explanation:
Which of the following elements will not form a polar covalent bond with oxygen?
A. Hydrogen
B. Sodium
C. Oxygen
D. Fluorine
sodium will form an ionic bond
Answer:
C. Oxygen
Explanation:
Oxygen will not form a polar covalent bond with another oxygen atom because when 2 atoms of the same element bond, it is a nonpolar covalent bond.
Since they are the same element, the 2 oxygens have the same electronegativity and will share their electrons equally.
Polar covalent bonds involve 2 atoms that will share electrons unequally
In the past mining companies were not made responsible for the clean-up of any of
the mine sites. As a result, abandoned mines had a severe impact on the
environment in Ontario. Which of these is not a result of these mining practices?
a)
Chemical reactions producing sulphuric acid decrease soil and water ph in the
area.
b)
Acid leaching dissolves metals found in the soil thus allowing them to enter
the water system.
c)
Heavy metals which are left tailing ponds can dissolve and enter the water
system.
d)
Old and inefficient mining smokestacks contaminate the soils around
abandoned mine sites.