Grade 8 Physical Science Physical, Chemical, Conservation

Front

What is a chemical property of a substance?

Back

A chemical property is a characteristic that can only be observed during a chemical reaction, indicating how a substance interacts with other substances.

Tags

NGSS.MS-PS1-2

Front

What happens when zinc is added to hydrochloric acid (HCl)?

Back

Bubbles are produced due to the release of hydrogen gas, indicating a chemical reaction.

Tags

NGSS.MS-PS1-2

Front

Why does oil float on water?

Back

Oil floats on water because it is less dense than water.

Front

What is the law of conservation of mass?

Back

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction; the total mass of reactants equals the total mass of products.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Front

What indicates a chemical change has occurred?

Back

Indicators of a chemical change include a change in color, temperature, formation of a gas (bubbles), or production of an odor.

Tags

NGSS.MS-PS1-2

Front

If a reaction starts with 20g of reactants, what is the expected mass of the products?

Back

The expected mass of the products will also be 20g, according to the law of conservation of mass.

Tags

NGSS.MS-PS1-5

Front

True or False: The number of atoms in the products is greater than in the reactants in a chemical reaction.

Back

False. The number of atoms in the products is equal to the number of atoms in the reactants.

Tags

NGSS.MS-PS1-5

Front

What is density?

Back

Density is the mass of a substance divided by its volume, often expressed in grams per cubic centimeter (g/cm³).

Front

What is an example of a physical change?

Back

An example of a physical change is melting ice into water, where the substance changes state but not its chemical composition.

Front

What is a chemical change?

Back

A chemical change results in the formation of one or more new substances with different properties from the original substances.

Tags

NGSS.MS-PS1-2