U9 Water and Solutions

Front

Why does ice float?

Back

As water freezes, it expands and its density decreases.

Front

Which technique could increase or speed up the rate of dissolving?

Back

Stirring the mixture.

Front

What is the minimum temperature needed to dissolve at least 10 g of KClO3?

Back

25 °C.

Front

How many grams of K2Cr2O7 are soluble in 100 g of water at 95 ºC?

Back

75 grams.

Front

The substance that gets dissolved is called solvent. True or False?

Back

False.

Front

What is a solution?

Back

A homogeneous mixture of two or more substances.

Front

What is solubility?

Back

The ability of a substance to dissolve in a solvent at a given temperature and pressure.

Front

What is the solvent in a solution?

Back

The substance that dissolves the solute.

Front

What is a solute?

Back

The substance that is dissolved in a solution.

Front

What happens to the density of water when it freezes?

Back

It decreases, causing ice to float.