Science

Question 1

1The chemical symbol for sodium is

Medium

A. Sd B. S C. Na D. So

Question 2

2The chemical symbol for copper is ___.

Medium

Your answer (fill in the blank)

Question 3

3A mixture is

Easy

A. a compound with fixed formula B. one kind of atom C. two or more substances not chemically combined D. always pure

Question 4

4Which of these is a compound?

Easy

A. gold B. oxygen C. water (H₂O) D. iron

Question 5

5Water is an element.

Easy

A. True B. False

Question 6

6In a solution, the substance that dissolves is the solute.

Easy

A. True B. False

Question 7

7Which of these is a mixture?

Easy

A. sodium chloride B. air C. copper D. carbon dioxide

Question 8

8Which statement about compounds is true?

Medium

A. Their properties differ from those of the elements in them. B. They have no fixed composition. C. They can be separated by filtering. D. They contain only one element.

Question 9

9A solution is made of

Easy

A. a solute dissolved in a solvent B. water only C. a gas and a solid only D. two solids

Question 10

10The chemical symbol for iron is

Medium

A. In B. Ir C. I D. Fe