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What is the simplest form of matter in which the substance cannot be broken into two or more simpler substances?

• element

• periodic table

• compound

• molecules

. Look at the equation. Hydrogen + oxygen --> water. What are the substances called the reactant?

• water

• oxygen

• hydrogen

• oxygen and hydrogen

Who is a scientist who first suggested the definition of an element?

• Robert Boyle

• Robert Hooke

• Charles Darwin

• Newton

What is the most abundant element in the universe?

• helium and nitrogen

• oxygen and hydrogen

• nitrogen and oxygen

• hydrogen and helium

What is the maximum number of Helium in the second shell?

• 0

• 8

• 2

• 1

What is the valence number of electron in a hydrogen?

• 1

• 2

• 4

• 8

Carbon dioxide is an example of

• mixture

• element

• compound

• all are correct

Which of the following type of radioactive radiation will stop by thin aluminum?

• alpha

• beta

• gamma

• none of the above

What is a mixture?

• A mixture is two or more substances combined.

• A mixture is two or more elements combined.

• A mixture is two or more atoms combined.

• All of the statements are correct.

Which of the following is an example of a pure substance?

• tea

• aluminum oxide

• orange

• tossed salad