Density, Acids/Bases, Chemical Reactions

Front

What is density?

Back

Density is the mass of an object divided by its volume, usually expressed in grams per cubic centimeter (g/cm³).

Front

How do you calculate density?

Back

Density = Mass / Volume.

Front

What happens to liquids with different densities when mixed?

Back

They form different layers because the less dense liquid floats on top of the denser liquid.

Front

What is the pH scale?

Back

The pH scale measures how acidic or basic a solution is, ranging from 0 (very acidic) to 14 (very basic), with 7 being neutral.

Front

What is an acid?

Back

An acid is a substance that donates protons (H⁺ ions) in a solution and has a pH less than 7.

Front

What is a base?

Back

A base is a substance that accepts protons (H⁺ ions) in a solution and has a pH greater than 7.

Front

What is a chemical reaction?

Back

A chemical reaction is a process where substances (reactants) are transformed into new substances (products) with different properties.

Front

What is a precipitate?

Back

A precipitate is a solid that forms and settles out of a liquid mixture during a chemical reaction.

Front

What indicates a chemical reaction has occurred?

Back

Evidence of a chemical reaction includes a color change, temperature change, gas production, or formation of a precipitate.

Front

What is an example of a physical change?

Back

Melting ice is a physical change because it changes state but not chemical composition.