Would you expect salts like NaCl, which have singly-charged ions, to have larger or smaller lattice energies compared to salts like CaO which are composed of doubly-charged ions?

Answer: Thus [tex]\Delta H[/tex] for the conversion of gray tin to white tin is -20.9 kJ

Explanation:

According to Hess’s law of constant heat summation, the heat absorbed or evolved in a given chemical equation is the same whether the process occurs in one step or several steps.

According to this law, enthalpy change of the overall reaction is the sum of the enthalpy changes of the intermediate reactions.

The final reaction is

[tex]Sn(s, gray)\rightarrow Sn(s, white)[/tex]  [tex]\Delta H=?[/tex]

The intermediate balanced chemical reaction will be,

[tex]Sn(s, gray)+O_2(g)\rightarrow SnO_2(g)[/tex]  [tex]\Delta H^0=-582.78kJ[/tex]    (1)

[tex]Sn(s, white)+O_2(g)\rightarrow SnO_2(g)[/tex]  [tex]\Delta H^0=-580.69kJ[/tex]     (2)    

substarcting (2) form (1) we get

[tex]\Delta H=\Delta H_1-\Delta H_2[/tex]

[tex]\Delta H=-582.78-(-580.69kJ)[/tex]

[tex]\Delta H=-20.9kJ[/tex]

Answer:

Nuclear fusion is when two atomic nuclei combine and form one nucleus. Nuclear fusion generates all of the Sun's energy. Inward pulling by the Sun's gravity is counteracted by outward pushing by the Sun's nuclear fusion; this balance keeps the sun from collapsing or exploding.

Explanation:

Answer:

it converts mass into energy and hydrogen into helium.

Explanation:

Nuclear fusion, the source of all the energy so generously radiated by the Sun

Answer:

[tex]\frac{214}{83} Bi[/tex]

Explanation:

In beta emission, a neutron is converted into a proton thereby reducing the neutron:proton (N/P) ratio.

When a beta emission occurs, the mass number remains the same while the nuclear charge increases by one unit. The daughter nucleus is found one place to the right of its parent in the periodic table.

Answer:

There is no air, wind, liquid water or life on the moons surface.

Explanation:

Answer:

ok i know it wont help now bc this was in 2020 but i did this on my lessons and its: There is no air, wind, liquid water, or life on the moon's surface.

Explanation:

i got all the right except the last one

Answer:

5

Explanation:

The number of the ions or the electrons transferable is called the number of equivalents. The number of equivalents of 0.70-mole iron (Fe³⁺) is 2.1 eq.

The number of equivalents is the property of the atom, molecule, or compound to transfer its ions or electrons in a chemical reaction. The equivalents can be said to be the moles of the ions with a valency of one to neutralize the oppositely charged species.

The number of equivalents is calculated as,

Number of equivalents = number of moles × valence

Given,

Valency of iron (Fe³⁺) = +3

Number of moles of iron = 0.70 moles

Substituting values above to calculate equivalents as

Number of equivalents = 0.7 × 3

Number of equivalents = 2.1 eq

Therefore, there are 2.1 equivalents in 0.70 moles of iron.

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First, we write the reaction for CH3OH combustion

CH3OH+3/2O2--->CO2+2H2O

for 1 mole of methanol, we get 1 mole of CO2, therefore for 5,25 moles of methanol we will get 5,25 moles of CO2

Answer: There are two types of crust; oceanic and continental. Oceanic crust is denser and thinner and mainly com​posed of basalt.

Explanation:

The crust This is the outside layer of the earth and is made of solid rock, mostly basalt and granite.  Oceanic crust is denser and thinner and mainly com​posed of basalt.

Answer:

The crust and the upper layer of the mantle together make up a zone of rigid, brittle rock called the Lithosphere .

Explanation:

Answer:

Mass = 61.6 g

Explanation:

Given data:

Mass of ammonia produced = 75.0 g

Mass of nitrogen needed = ?

Solution:

Chemical equation:

N₂ + 3H₂    →      2NH₃

Number of moles of ammonia:

Number of moles = mass/molar mass

Number of moles = 75 g/ 17 g/mol

Number of moles =  4.4 mol

No we will compare the moles of ammonia with nitrogen.

              NH₃           :          N₂

                2             :           1

               4.4           :          1/2×4.4 =2.2 mol

Mass of N₂:

Mass = number of moles × molar mass

Mass = 2.2 mol × 28 g/mol

Mass = 61.6 g

Answer:

Explanation:

I hope this helps xD

Answer:

Electrical energy is used to power up a light bulb. The current moves from the outlet to the light bulb through the wire.

Lightning is another example of electrical energy. The negatively charged particles are separated from the positively...

Batteries are also sources of electrical energy. In car batteries, the moving charges Explanation:

fI gave u 3 think of the 4th one

Answer:

the yeast did not produce the carbon dioxed needed for the bread to rise.

Explanation:

i am not fooly sure but i think its it

but warn me if i am wrong pweez

Answer:

 11(u²  + 9)

Explanation:

The problem is to write a numerical expression for the statement given;

       sum of u squared and 9, multiplied by eleven

Variable given  = u;

             u squared = u²

         Sum;

                     u²  + 9

    multiplied by 11;

                     11(u²  + 9)

Answer:

7. A. ee

8. Genotypes in which the dominant gene must show: Both A & B

9. Genotypes in which the recessive genes must show: A. aa

Answer:Gaseous C4H8 + oxygen gas ---> carbon dioxide + water

C4H8(g) + 6O2(g) ---> 4CO2(g) + 4H2O(g)

Not the one u want but its similar so u can get an idea of what the one u want is like  

Answer:

not sure if this us right but oxygen and fluorine? I learned chem but I forgot about it kinda sorry

Answer:

The answer is one

Explanation:

I will just type any rubbish here bcuz my answer should be more than 20 words..... Just know the answer is 1

The question is incomplete, the complete question is;

Chlorine monoxide accumulates in the stratosphere above Antarctica each winter 3nd plays a key role the formation of the ozone hole above the South Pole each spring Eventually. CIO decomposes acco to the equation: 2CIO(g) rightarrow CL2(g) + O2(g) The second-order rate constant for the decomposition of CIO is 6950000000 M-1 s-1 at a particular temperature Determine the half-life of CIO when its initial concentration is .0000000185 M

Answer:

7.8 * 10^-3 s

Explanation:

Given that the half life of a second order reaction is obtained from the formula;

t1/2 = k-1[A]o-1

t1/2 = 1/k[A]o

second order rate constant (k) = 6950000000 M-1 s-1

initial concentration ([A]o) =0.0000000185 M

t1/2 = 1/6950000000 * 0.0000000185

t1/2 = 7.8 * 10^-3 s

Look at my screenshot:

Answer:

A 7.59 mol Ne

Explanation:

The number of moles of Ne in a sample of 4.57 x 10²⁴ atoms of neon (Ne) are 7.59 mol of Ne. Hence Option (A) is the correct option. It can be solved with the help of Mole concept.

The mole, symbol mol, is the SI base unit of amount of substance.

The quantity amount of substance is a measure of how many elementary entities of a given substance are in an object or sample.

n = given number / Avogadro's number

  = 4.57 x 10²⁴ / 6.022 x 10²³

  = 7.59 mol of Ne

Therefore, The number of moles of Ne in a sample of 4.57 x 10²⁴ atoms of neon (Ne) are 7.59 mol of Ne. Hence Option (A) is the correct option. It can be solved with the help of Mole concept.

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Answer:

Atoms are the building blocks of matter. They are the smallest particles of an element that still have the element's properties. All atoms are very small, but atoms of different elements vary in size. Three main types of particles that make up all atoms are protons, neutrons, and electrons.

Explanation:

Answer:

Atoms are the basic building blocks for life

Answer:

Ionic compounds are neutral compounds made up of positively charged ions called cations and negatively charged ions called anions. For binary ionic compounds (ionic compounds that contain only two types of elements), the compounds are named by writing the name of the cation first followed by the name of the anion.

Explanation:

Hope this helps.

Answer:

11

Explanation:

Answer:

4per m 2

20 mice divided by 5 so it will be 4 per m 2

Answer:

replacement

Explanation:

Explanation:

Hi! I don't know why I am not getting any brainliest answer and if you are kind enough could you please mark me as the brainliest answer and please follow me also.

Answer:

Mass = 32 g

Explanation:

Given data:

Number of moles of oxygen = 1.0 mol

Mass of oxygen = ?

Solution:

Formula:

Number of moles = mass/molar mass

Molar mass of oxygen (O₂) is  32 g/mol

by putting values,

1.0 mol = mass/ 32 g/mol

Mass = 1.0 mol ×32 g/mol

Mass = 32 g

Answer:

Our current model of the atom can be broken down into three constituents parts – protons, neutron, and electrons. Each of these parts has an associated charge, with protons carrying a positive charge, electrons having a negative charge, and neutrons possessing no net charge.

Answer:

249 K

Explanation:

Step 1: Given data

Step 2: Calculate the moles corresponding to 4.03 g of nitrogen

The molar mass of N₂ is 28.01 g/mol.

4.03 g × 1 mol/28.01 g = 0.144 mol

Step 3: Calculate the temperature of the gas sample

We will use the ideal gas equation.

P × V = n × R × T

T = P × V / n × R

T = 3.19 atm × 0.921 L / 0.144 mol × 0.0821 atm.L/mol.K

T = 249 K

Answer:

Explanation:

The new pressure can be found by using the formula for Boyle's law which is

[tex]P_1V_1 = P_2V_2[/tex]

Since we are finding the new pressure

[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]

From the question

760 mmHg = 1 atm

380 mmHg = 0.5 atm

We have

[tex]P_2 = \frac{0.5 \times 5}{8} \\ = 0.3125[/tex]

We have the final answer as

Hope this helps you