Unit 4 Review

Front

What happens to the mass of a liquid in a thermometer when it is heated?

Back

The mass stays the same.

Front

What effect does decreasing the temperature have on the rate of a chemical reaction?

Back

It slows down the rate of the chemical reaction.

Tags

NGSS.MS-PS3-4

Front

How can a chemist speed up a slow chemical reaction in a beaker?

Back

By heating the beaker on a hot plate.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-3

Front

Why does an opened bottle of milk stay fresh longer in a refrigerator than at room temperature?

Back

The lower temperature reduces the rate of the chemical reaction.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Front

What is the difference between scientific laws and theories?

Back

Laws are descriptions of phenomena, while theories are explanations of why phenomena exist.

Front

What is the definition of a chemical reaction?

Back

A process in which substances (reactants) are transformed into different substances (products).

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What is the role of temperature in chemical reactions?

Back

Temperature affects the energy of particles, influencing the rate of chemical reactions.

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

Front

What happens to the volume of a liquid when it is heated?

Back

The volume increases.

Tags

NGSS.MS-PS1-4

Front

What is the effect of stirring on the rate of a chemical reaction?

Back

Stirring can increase the rate of a reaction by mixing reactants more thoroughly.

Front

What is a catalyst?

Back

A substance that increases the rate of a chemical reaction without being consumed in the process.