Chemistry Quiz 19 (20 MCQs)

Quiz Instructions

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1. Which is an example of a physical change?

Correct Answer: C) Burining a candle.

2. Why is water necessary to your body?

Correct Answer: D) It dissolves and transports substances.

3. Which notations represent different isotopes of the element sodium?

Correct Answer: D) 22Na and 23Na.

4. In an exothermic reaction, heat is

Correct Answer: A) Released.

5. What is the atomic symbol for sodium?

Correct Answer: A) Na.

6. Anything that takes up space and has mass is known as .....

Correct Answer: A) Matter.

7. What is the molar mass of (NH4)3PO4

Correct Answer: C) 149.12 g/mol.

8. The SI base unit for mass is the

Correct Answer: D) Kilogram.

9. If a dozen Clementine oranges have a mass of 744 g, what will be the mass of 15 Clementines?

Correct Answer: D) 930 g.

10. PH stands for presence of

Correct Answer: B) Hydrogen.

11. Matter cannot be created or destroyed; this is the .....

Correct Answer: B) Law of Conservation of Mass.

12. Isotopes have different numbers of

Correct Answer: B) Neutrons.

13. What is the number of valence electrons for Oxygen?

Correct Answer: B) 6.

14. The CORRECT name of Al2O3 is .....

Correct Answer: A) Aluminum oxide.

15. Reactions that give out heat to the surrounding are classified as one of the following

Correct Answer: B) Exothermic.

16. How many neutrons are in an atom of chlorine-35?

Correct Answer: B) 18.

17. Chemistry is the study of

Correct Answer: D) All the above.

18. Cellulose and starch are carbohydrates that are found in .....

Correct Answer: A) Plants.

19. What is the name of the precipitate formed in the reaction of calcium sulfide and aluminum nitrate

Correct Answer: B) Aluminum sulfide.

20. Which of the following is an example of a chemical property?

Correct Answer: C) Ability to rust.