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3 years ago

What is a property of a substance? why are properties important? Explain your answer

1 answer:

3 0

A physical property is a characteristic of a substance that can be observed or measured without changing the identity of a substance. It is important to know because it can help define what the substance is, because if it has certain characteristics than a certain element, it can be traced to a specific substance.

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What does the 4 mean in the formula4Na2SO3

Anon25 [30]

Answer:

4 means there are four molecules of Na₂SO₃.

Explanation:

Molecule:

A molecule is the smaller particle which can exist independently.

It may be monoatomic , diatomic, triatomic etc.

For example,

Hydrogen molecule consist of two atoms H₂

Nitrogen molecule = N₂

It may be combination of atoms of different elements.

HCl, H₂SO₄,Na₂SO₃

HCl = 1 mole of hydrochloric acid or one molecules of hydrochloric acid

H₂SO₄= 1 mole of sulfuric acid or one molecule of sulfuric acid

Na₂SO₃ = 1 mole of sodium sulfite or one molecule of sodium sulfite.

4Na₂SO₃ = 4 mole of sodium sulfite or four molecule of sodium sulfite.

The coefficient before the formula indicate the total number of molecules.

4 0

3 years ago

What is the molar mass of Aul

torisob [31]

Answer:

no idea

Explanation:

7 0

3 years ago

Which focuses on the composition of matter

Sladkaya [172]

Answer is A. Analytical chemistry

8 0

3 years ago

Read 2 more answers

What has mass and takes up space

I am Lyosha [343]

Answer:

matter

Explanation:

everything around us

6 0

3 years ago

Any process with a negative change in enthalpy and a positive change in entropy will be:_______.

harkovskaia [24]

Answer:

a. spontaneous

Explanation:

Hello,

In this case, since the Gibbs free energy is a metric that allows us to know whether a chemical reaction is spontaneous (Gibbs free energy less than 0) or nonspontaneous (Gibbs free energy greater than 0) we can mathematically define it as:

$\Delta G=\Delta H-T\Delta S$

Thus, if the enthalpy is negative and the entropy is negative, the subtraction become always negative, for which the Gibbs free energy is negative as well, therefore, based on the aforementioned, any process with a negative change in enthalpy and a positive change in entropy will be: a. spontaneous.

Best regards.

5 0

2 years ago