Science

Question 1

Which of these is the best explanation of how a smooth round stone became smooth

Answer 1

It was in a stream for a long time

Question 2

When a lobster grows a claw to replace one that was lost, the process is called

Answer 2

Regeneration

Question 3

Any astronomical body that revolves around a larger body is called

Answer 3

A satellite

Question 4

In chemistry, to be classified as an organic substance, a substance must contain

Answer 4

Carbon atoms

Question 5

Which element does NOT contain any neutrons?

Answer 5

Hydrogen

Question 6

The chemical formula of a compound describes the elements the compound contains and the

Answer 6

ratio of elements in the compound.

Question 7

What is the symbol for the hydroxyl ion?

Answer 7

OH-

Question 8

Tympanic membranes are also known as the

Answer 8

ear drums.

Question 9

Which of the following actions produce a chemical change?

Answer 9

Adding salt to the hot water

Question 10

Choking is prevented by the

Answer 10

epiglottis covering the voice box.

Question 11

What do a hydrogen molecule and an oxygen molecule have in common?

Answer 11

The charge on each electron

Question 12

Which of the following is a non-renewable source?

Answer 12

Copper

Question 13

What are the two main gases that make up the stars?

Answer 13

Hydrogen and helium

Question 14

The term “meiosis” is usually associated with

Answer 14

reproduction.

Question 15

Which of the following enables this pen to work?

Answer 15

Capillary action