A scientist completes a thermal decomposition reaction. 12.25g of calcium carbonate, CaCO3, is heated
and forms calcium oxide, Cao, and carbon dioxide, CO2.
a. Write a balanced chemical equation to demonstrate this reaction. Include state symbols.


b. Calculate the number of moles of calcium carbonate that is thermally decomposed in this
reaction.
Ok

Answer:

Mendeleev jotted down the symbols for the chemical elements, putting them in order according to their atomic weights and inventing the periodic table.

Answer:

On 17 February 1869, Russian chemist Dmitri Mendeleev jotted down the symbols for the chemical elements, putting them in order according to their atomic weights and inventing the periodic table. So convinced was he of the soundness of his periodic law that he left gaps for these elements in his table.

Answer:

wheres the image

Explanation:

Answer:

A. Tertiary alcohol

Explanation:

Secondary alcohols are oxidized to ketones - and that's it. For example, if you heat the secondary alcohol propan-2-ol with sodium or potassium dichromate(VI) solution acidified with dilute Sulphuric acid, you get propanone formed. Playing around with the reaction conditions makes no difference whatsoever to the product.

Answer:

75.924 g

Explanation:

To answer this question we first need to calculate the molar mass of Ga₂(SO₃)₃:

Molar Mass of Ga₂(SO₃)₃ = (Molar Mass of Ga)*2 + (Molar Mass of SO₃)*3

Molar Mass of Ga₂(SO₃)₃ = (69.72 g/mol)*2 + (80.06 g/mol) * 3

Then we convert 0.20 moles to grams, using the molar mass of Ga₂(SO₃)₃:

Mass of 0.20 moles of Ga₂(SO₃)₃ is 75.924 g

It is defined as the ratio of given mass over molar mass.

Given:

Number of moles= 0.20 moles

To find:

Mass=?

We need to calculate molar mass of Ga₂(SO₃)₃ first:

Molar Mass of Ga₂(SO₃)₃ = (Molar Mass of Ga)*2 + (Molar Mass of SO₃)*3

Molar Mass of SO₃ = Molar Mass of S + (Molar Mass of O)*3 = 80.06 g/mol

Molar Mass of Ga_2(SO_3)_3 = (69.72 g/mol)*2 + (80.06 g/mol) * 3

Molar Mass of Ga₂(SO₃)₃ =  379.62 g/mol

Then we convert 0.20 moles to grams, using the molar mass of Ga₂(SO₃)₃:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}} \\\\\text{Given mass}=\text{Number of moles}*\text{Molar mass}\\\\\text{Given mass}=0.20 moles*379.62 g/mol\\\\\text{Given mass}=75.92 grams\\[/tex]

Thus, the mass of 0.20 moles of Ga₂(SO₃)₃ is 75.92 grams.

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Answer:

Most of the atom is empty space. The rest consists of a positively charged nucleus of protons and neutrons surrounded by a cloud of negatively charged electrons. The nucleus is small and dense compared with the electrons, which are the lightest charged particles in nature.

Answer:

[tex]T_S=-1.09\°C[/tex]

Explanation:

Hello!

In this case, since the freezing point depression for a solution is computed via:

[tex](T_S-T_W)=-imK_f[/tex]

Whereas TW is the freezing temperature of water, TS that of the solution, i the van't Hoff's factor (3 for K2S as it ionizes properly), m the molality of the solution and Kf the freezing point constant of water. Thus, we plug in to obtain:

[tex](T_S-0\°C)=-3*0.195m*1.86\frac{\°C}{m}\\\\T_S=-1.09\°C[/tex]

Best regards!

The correct answer is -1.088. (Don't forget the negative sign).

Answer:

21.46 kg.

Explanation:

Hello!

In this case, when a variety of measurements are said to contribute to a total, we understand we need to add them all up in order to get that total; in such a way, since the given seafood is composed by 15 kg of salmon, 4.7 kg of crab and 1.76 kg of oysters, the total mass turns out:

[tex]m_T=15kg+4.7kg+1.76kg\\\\m_T=21.46kg[/tex]

Best regards!

Phan

convex

concave

duplex

Answer:

50 N ( left)

Explanation:

Given data:

The force on right side = 450 N

The force on left side = 500 N

Net force = ?

Solution:

F (net) = 500 N - 450 N

F (net) =  50 N ( left)

Answer:

Wood absorbs solar radiation to make chemical energy.

The chemical energy of wood has been absorbed by solar radiation. Thus, option B is correct.

The wood has been the source of energy by the burning for a long duration. The chemical energy has been stored in the dry wood has been converted to light and heat energy on burning.

The energy stored in the wood has been comprised by photosynthesis, where the solar energy has been entrapped in the wood and is converted to chemical energy that is stored.

Thus, the chemical energy of wood has been absorbed by solar radiation. Thus, option B is correct.

For more information about the stored energy of wood, refer to the link:

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Answer:

The atomic mass of an element is the average mass of the atoms of an element measured in atomic mass unit (amu, also known as daltons, D). The atomic mass is a weighted average of all of the isotopes of that element, in which the mass of each isotope is multiplied by the abundance of that particular isotope. (Atomic mass is also referred to as atomic weight, but the term "mass" is more accurate.)

Answer:

0.16 M.

Explanation:

Hello!

In this case, since the reaction can be determined as zeroth-order because of the units of M/s, we can write the rate law as:

[tex][X]=[X]_0-kt[/tex]

In such a way, since we need the initial concentration of X, we proceed as follows:

[tex][X]_0=[X]+kt[/tex]

So we plug in to obtain:

[tex][X]_0=0.096M+3.6x10^{-5}\frac{M}{s}*30.min*\frac{60s}{1min}[/tex]

[tex][X]_0=0.16M[/tex]

Best regards!

Answer:

b. Beta emission, beta emission

Explanation:

A factor to consider when deciding whether a particular nuclide will undergo this or that type of radioactive decay is to consider its neutron:proton ratio (N/P).

Now let us look at the N/P ratio of each atom;

For B-13, there are 8 neutrons and five protons N/P ratio = 8/5 = 1.6

For Au-188 there are 109 neutrons and 79 protons N/P ratio = 109/79=1.4

For B-13, the N/P ratio lies beyond the belt of stability hence it undergoes beta emission to decrease its N/P ratio.

For Au-188, its N/P ratio also lies above the belt of stability which is 1:1 hence it also undergoes beta emission in order to attain a lower N/P ratio.

Radioactive decay refers to the loss of energy by an unstable atomic nucleus as radiation. The substance having unstable nuclei is radioactive.

The correct answer is:

Option B. Beta emission, beta emission

The radioactive decay of 13B and 188 Au can be explained as:

1. Neutron proton ratio refers to the particular nuclei that will undergo what type of radioactive decay.

2. In the B-13 element, the N/P ratio is beyond the stability of the atom, thus, it will emit beta emission to reduce the N/P ratio.

3. Similarly, the N/P ratio of the Au-188 is above the stability of the atom, thus, it undergoes the beta emission to reduce the N/P ratio.

Thus, the correct answer is Option B.

To know more about radioactive decay, refer to the following link:

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Answer:

0.47 g

Explanation:

From the question given above, we obtained the following information:

4.20 g of nitrogen occupies 100 L.

We can obtain the mass of nitrogen that occupied 11.2 L by doing the following:

4.20 g of nitrogen occupies 100 L.

Therefore, Xg of nitrogen will occupy 11.2 L i.e

Xg of nitrogen = (11.2 × 4.2) / 100

Xg of nitrogen = 0.47 g

From the calculation made above, 0.47 g of nitrogen will occupy 11.2 L

Answer:

12

Explanation:

the 4 by the element symbol O multiplied by the 3 on the outside of the parentheses

Answer:

[tex]\boxed {\boxed {\sf C. \ 12 \ oxygen \ atoms }}[/tex]

Explanation:

We are given the chemical formula:

[tex]Fe(ClO_4)_3[/tex]

There are 3 elements here:

The question asks for the number of oxygen atoms, so we can just focus on the O in the formula.

The O has a subscript of 4, indicating there are 4 oxygen atoms in the compound. But the compound is also enclosed in parentheses with a subscript of 3. Therefore, there are 3 of the compounds with 4 oxygen atoms.

We can multiply 3 and 4.

There are 12 oxygen atoms.

Answer:

100M

Explanation:

Answer:

121

Explanation:

add 1+120 to get answer

Answer: The oxidation state of a free element (uncombined element) is zero. For a simple (monoatomic) ion, the oxidation state is equal to the net charge on the ion. For example, Cl– has an oxidation state of -1. When present in most compounds, hydrogen has an oxidation state of +1 and oxygen an oxidation state of −2.

Hope this helps...... Stay safe and have a Merry Christmas!!!!!!!!!!! :D

Explanation:

The molecular formula : Al₂Cl₆

Given

20.2% by mass of Aluminum and 79.8% by mass of Chlorine.

Required

the molecular formula

Solution

Aluminium (Ar=27 g/mol)

[tex]\tt \dfrac{20.2}{27}=0.748[/tex]

Chlorine(Ar=35.5 g/mol)

[tex]\tt \dfrac{79.8}{35.5}=2.248[/tex]

mol ratio Al : Cl =

[tex]\tt \dfrac{0.748}{0.748}\div \dfrac{2.248}{0.748}=1\div 3[/tex]

So the empirical formula = AlCl₃

(Empirical formula)n=Molecular formula

(27+3.35.5)n=267

(133.5)n=267⇒n=2

The molecular formula : Al₂Cl₆

Answer:

Deeper water, where too little sunlight penetrates for photosynthesis, is called the aphotic zone. Surface water dissolves oxygen from the air, so there is generally plenty of oxygen in the photic zone to support organisms. Water near shore usually contains more dissolved nutrients than water farther from the shore

Explanation:

Answer:

BBBBBBBB ITS B

Explanation:

Answer:

yes

Explanation:

Answer:

C

Explanation:

Because molecules of solids don't move

while molecules of liquids and gases move.

I Hope this helps!!.

Answer:

Explanation:

Sodium chloride has a high melting and boiling point

There are strong electrostatic attractions between the positive and negative ions, and it takes a lot of heat energy to overcome them. Ionic substances all have high melting and boiling points.

Answer:

The segment of this graph that shows a decreasing velocity is the EF segment. AB and DE segments show that whatever was moving, in these segments was stopped. The segment BC shows an increase in velocity - the metres travelled were always more as the time went by.

Explanation:

Answer:

A carbon atom bound to three atoms (two single bonds, one double bond) is sp2 hybridized and forms a flat trigonal or triangular arrangement with 120° angles between bonds. Notice that acetic acid contains one sp2 carbon atom and one sp3 carbon atom.

Answer:

The solute is the substance that is being dissolved,

Explanation:

A solution is a homogeneous mixture consisting of a solute dissolved into a solvent .

Answer:

solutes

Things which dissolve are called solutes and the liquid in which they dissolve is called a solvent to form a solution. Strongly polar substances easily attract water molecules. The water molecules surround the charged solute.

Explanation:

Took the same test and that was the one that was right hope this helps you

Answer:

Filtrate: Mixture of salt and water.

Residue: rock pieces

Answer:

Salt solution will be the filtrate

and the rock pieces will be the residue.

Explanation:

This is because salt is soluble in water and hence

it cannot be filtered out of water giving as a salt solution as the filtrate and since the rock pieces are not soluble in water they are left out and they become the residue.

Answer:

At Equilibrium

[COCl₂] = 0.226 M

[CO] = 0.054 M

[Cl₂] = 0.054 M

Explanation:

Given that;

equilibrium constant Kc = 1.29 × 10⁻² at 600k

the equilibrium concentrations of reactant and products = ?

when 0.280 moles of COCl2(g) are introduced into a 1.00 L vessel at 600 K. [COCl²]

Concentration of  COCl₂ = 0.280 / 1.00 = 0.280 M

COCl₂(g) ---------->  CO(g)   +  Cl₂(g)

0.280                      0                0  ------------ Initial

-x                             x                 x

(0.280 - x)               x                 x   ----------- equilibrium

we know that; solid does not take part in equilibrium constant expression

so

KC = [CO][Cl₂] / COCl₂

we substitute

1.29 × 10⁻² = x² / (0.280 - x)

0.0129 (0.280 - x) = x²

x² = 0.003612 - 0.0129x

x² + 0.0129x - 0.003612 = 0

x = -b±√(b² - 4ac) / 2a

we substitute

x = [-(0.0129)±√((0.0129)² - 4×1×(-0.003612))] / [2 × 1 ]

x = [-0.0129 ± √( 0.00017 + 0.01445)] / 2

x = [-0.0129 ± 0.1209] / 2

Acceptable value of x =[ -0.0129 + 0.1209] / 2

x = 0.108 / 2

x = 0.054

At equilibrium

[COCl₂] = (0.280 - x) = 0.280 - 0.054 = 0.226 M

[CO] = 0.054 M

[Cl₂] = 0.054 M