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3 years ago

When a candle is cooling down is it a physical or chemical change

Chemistry

2 answers:

Temka [501]3 years ago

6 0

Answer:

Chemical

Explanation:

because its still hot and changing

Ksivusya [100]3 years ago

3 0

Physical

When something is cooling it isn’t changing it’s chemical composition so it’s physical

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3 years ago

What is the concentration of a solution that has 15.0 g NaCl dissolved to a total of 750 ml?

Oksana_A [137]

<u>Answer:</u> The concentration of solution is 0.342 M

<u>Explanation:</u>

To calculate the molarity of solution, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (in mL)}}$

We are given:

Mass of solute (Sodium chloride) = 15 g

Molar mass of sodium chloride = 58.5 g/mol

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Putting values in above equation, we get:

$\text{Molarity of solution}=\frac{15g\times 1000}{58.5g/mol\times 750mL}\\\\\text{Molarity of solution}=0.342M$

Hence, the concentration of solution is 0.342 M

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3 years ago

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sveticcg [70]

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valentina_108 [34]

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The answer to this question is A. 100

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