11. Alvin performs an experiment on displacement reactions. He brought materials like zinc, copper hydrochloric acid, zinc sulfate, and copper (II) sulfate.
which of these materials are compounds.

A. zinc, zinc sulfate hydrochloric acid.
B. zinc, copper hydrochloric acid.
C. hydrochloric acid, zinc sulfate, copper (II) sulfate.
D. zinc, copper zinc sulfate, copper (II) sulfate.

13. Which of the following statements is TRUE for both element and compound?

A. They can be broken down further though chemical change.
B. They are uniform and have composition.
C. They are composed of different type of atom.
D. They are composed of only one type of atom.

14. Reading supplement facts of the food you buy gives you an idea of the nutrients it contains. Which of the following is correctly matched as element and compounds?

A. element: iron; compound: sodium
B. element: sodium; compound: sugar
C. element: protein; compound: carbohydrate
D. element: sugar; compound: iron

15 Which of the following properties describes compound?
I- It is made up of one atom only.
II- It is joined though chemical process
III- It is made up of two or more different atoms.
IV- It cannot be broken down further.
A. I only C. II and III
B. I and II D. IV only

16. which of following properties describes an element?
I- It is made up of one atom only.
II- It is joined though a chemical process.
III- It is made up of two or more different atoms.
IV- It cannot be down further.
A. I only. C. II and III.
B. I and II. D. I and IV.

17. Evaluate the following statements:

I- Copper is a compound while copper (II) sulfate is element.
ll- Zinc is an element while zinc sulfate is a compound.
III- Hydrochloric acid and hydrogen peroxide are both compounds.
IV- Both elements and compounds can be broken down further.
Which statements above correctly describe elements and compounds?
A. I and II. C. III and IV.
B. II and III. D. I and IV.

18. Which of the following materials is a pure substance?
A. brine. C. aluminum foil.
B. cement. D. petroleum.

19. how will you identify whether a liquid sample is pure substance or mixture?
A. boiling test. C. color test.
B. melting test. D. solubility test.

20. Which of the following mixture can be separated physically through evaporation?
A. marbles and water. C. salt and water.
B. iron filings and sand. D. Sand and gravel.