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abruzzese [7]
3 years ago
14

What are some chemical formulas for compounds?

Chemistry
1 answer:
Galina-37 [17]3 years ago
4 0
Hello there!

First, we need to know what compounds are.
Compounds "are pure substances that are made up of two or more elements that are chemically combined in fixed mass ratios."

Now we need to understand what chemical formulas are.
The compounds have a chemical formula which tell us that
a) the elements that are present in the compound
b) the ratio of these elements in the compound

What are some chemical formulas for compounds?
Well, we start with water. The chemical formula for water is H2O

When we go back to the definition of compounds, it says it is when a pure substance that are made up two or more elements. So, whatever is a pure substance and it's made up of two elements. These elements are Hydrogen and Oxygen. And keep an mind that water is made up with metal plus non-metal.

--------------------------------------
Here are one more chemical formulas for compounds
 Sodium Chloride = NaCI


I included a picture that might help you too. (Credit to google image)
 


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Which energy changes are associated with a liquid boiling?
Ray Of Light [21]

Answer: D. Energy is absorbed, and kinetic energy increases.

Explanation:

An endothermic reaction is a type of of chemical reaction in which energy is absorbed from the surrounding.

An Exothermic reaction is a type of of chemical reaction in which energy is released into the surrounding.

When a liquid boils , it converts to gaseous state by absorbing energy from surroundings.

Kinetic energy is the energy possessed by an object by virtue of motion of particles.

Thus when liquid molecules absorb energy, the molecules gain kinetic energy and start moving faster in gaseous state.

7 0
3 years ago
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0. 820 mole of hydrogen gas has a volume of 2. 00 l at a certain temperature and pressure. What is the volume of 0. 125 mol of t
Mamont248 [21]

The volume of 0.125 mole of the gas at the same temperature and pressure 0.30 L

<h3>Data obtained from the question </h3>
  • Initial mole (n₁) = 0.82 mole
  • Initial volume (V₁) = 2 L
  • New mole (n₂) = 0.125 mole
  • Pressure = Constant
  • Temperature = Constant
  • New Volume (V₂) =?

<h3>How to determine the new volume</h3>

The new volume can be obtained as illustrated below

PV = nRT

Divide both side by P

V = nRT / P

Divide both side by n

V / n = RT / P = Constant

Thus,

V₁ / n₁ = V₂ / n₂

2 / 0.82 = V₂ / 0.125

Cross multiply

0.82 × V₂ = 2 × 0.125

Divide both side by 0.82

V₂ = (2 × 0.125) / 0.82

V₂ = 0.30 L

Learn more about ideal gas equation:

brainly.com/question/4147359

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4 0
1 year ago
A hydrate is a compound that has water molecules within its crystal structure. Magnesium sulfate heptahydrate, MgSO4·7H2O, is a
Alenkasestr [34]

Answer:

We are heating the sample repeatedly to become a pure compound of only MgSO4 (withot H2O) and a constant mass.

Explanation:

Step 1: Data given

Mass of MgSO4·7H2O = 5.06 grams

The remaining MgSO4 had a constant mass of 2.47 grams.

Step 2: Explain why the sample in the crucible was heated repeatedly until the sample had a constant mass.

Before heating the compound has magnesium sulfate and water.

The total mass of this compound is 5.06 grams

By heating we try to eliminate the water.

After heating there remain mgSO4 with a mass of 2.47 grams

This means 5.06 - 2.47 = 2.59 grams is water. All of this is eliminated.

The heating process happens repeatedly to make sure the final compound is pure. So the 2.47 grams os only MgSO4. If the mass would not be constant. It means the compound is not pure, the not all the water is eliminated yet.

So we are heating the sample repeatedly to become a pure compound of only MgSO4 (withot H2O) and a constant mass.

4 0
3 years ago
The chart shows four environments and the kind of succession that would occur there.
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Answer: row 1

Explanation:

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At constant P and n, T decreases at V is?
goblinko [34]

Answer:

This means that as pressure increases,the volume decreases or the volume increases as the temperature increases, and decreases as the temperature decreases

8 0
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