Chemistry Quiz 21 (20 MCQs)

Quiz Instructions

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1. How are ionic bonds formed?

Correct Answer: B) When electrons are transferred.

2. Which of the following lists contains a solid, liquid and a gas?

Correct Answer: B) K, Br, F.

3. What does an artery do?

Correct Answer: A) Transfers blood away from the heart.

4. The pH Scale works in powers of .....

Correct Answer: A) 10s.

5. What does the ATOMIC MASS tell us about an atom?

Correct Answer: A) Protons + Neutrons.

6. Which is a carboxyl group?

Correct Answer: A) -COOH.

7. What is the percent composition of a compound that contains 40.8 g carbon and 54.4 g oxygen?

Correct Answer: A) 42.9 % carbon; 57.1% oxygen.

8. The lock-and-key model of enzyme function illustrates which important characteristic of enzymes?

Correct Answer: B) Precise fit with a particular substrate.

9. When atoms share electrons they create a bond called a(n)

Correct Answer: D) Covalent Bond.

10. How many elements are C6H12O6?

Correct Answer: C) 3.

11. In which shel lor energy level are the valence electrons of the elements in period 2 found?

Correct Answer: B) 2.

12. Which statement is NOT true of chemical reactions?

Correct Answer: A) Synthesis reactions involve the breaking of bonds.

13. Covalent bonds mainly occur between

Correct Answer: A) Two nonmetallic elements.

14. What is the maximum capacity of electrons located in the d-sub shell?

Correct Answer: C) 10 electrons.

15. The energy required to start a chemical reaction is .....

Correct Answer: C) Activation.

16. The ..... is considered as standard by the IUPAC

Correct Answer: A) Carbon-12.

17. Which area of chemistry focuses on the composition of matter?

Correct Answer: D) Analytical.

18. Source of quick energy

Correct Answer: A) Carbohydrates.

19. The subatomic particle with a negative charge is the

Correct Answer: A) Electron.

20. What elements is necessary for muscle contractions and nerve impulse transmission?

Correct Answer: B) Na & K.