S1 exam

Front

What is a testable answer to a scientific question that predicts what will happen in an experiment?

Back

Hypothesis

Front

Which of the following is a chemical property of water?

Back

none of the choices

Front

What is a sign that a chemical reaction has occurred?

Back

formation of a gas

Front

How is a gas defined?

Back

Indefinite shape, indefinite volume

Front

How many protons are in Beryllium?

Back

4

Front

What is the definition of a chemical property?

Back

A characteristic of a substance that can only be observed during a chemical reaction.

Front

What is the difference between a physical change and a chemical change?

Back

A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

Front

What is the law of conservation of mass?

Back

In a chemical reaction, mass is neither created nor destroyed.

Front

What is an example of a physical change?

Back

Melting of ice.

Front

What is the definition of an element?

Back

A pure substance that cannot be broken down into simpler substances by chemical means.