Science 8: Unit One Review

Front

What ion is more present in a basic solution?

Back

OH- (hydroxide ion)

Front

Which illustration shows the spacing of particles in solids?

Back

Illustration A

Front

What is a qualitative observation?

Back

A description based on qualities, such as 'The bird's nest was made from twigs and some moss.'

Front

What is a chemical change?

Back

A change that results in the formation of new chemical substances, e.g., iron rusting, wood burning, food rotting.

Front

What is a physical change?

Back

A change that does not alter the chemical composition of a substance, e.g., water evaporating.

Front

What is a chemical property?

Back

A characteristic of a substance that becomes evident during a chemical reaction, e.g., rusting, burning.

Front

What is a physical property?

Back

A characteristic that can be observed or measured without changing the substance's chemical identity, e.g., boiling point.

Front

What is the difference between qualitative and quantitative observations?

Back

Qualitative observations describe qualities (e.g., color, texture), while quantitative observations involve measurements (e.g., length, mass).

Front

What happens to particles in a solid?

Back

Particles are closely packed together and vibrate in fixed positions.

Front

What happens to particles in a liquid?

Back

Particles are close together but can move past one another, allowing liquids to flow.