31 Jan 20. Which of the following

Question 1

1. The superscript of element Cl? indicates it is a

A. negative isotope.

B. negative ion.

C. positive ion.

D. neutral atom.

Question 2

2. If the thermometer reads 20° Celsius, what’s the temperature in Fahrenheit?

A. 68°

B. 72°

C. 52°

D. 36°

Question 3

3. Which of the following does not increase reaction rates?

A. Pressure

B. Catalyst

C. Temperature

D. Inhibitor

Question 4

4. Which of the following statements is not true of using electron dot diagrams?

A. An element with eight valence electrons is chemically unstable.

B. An atom is chemically stable if all dots are paired.

C. The element’s group number provides a clue about the number of valence electrons.

D. Dots should be placed one at a time on each side of the chemical symbol.

Question 5

5. If a 0.5 L container of juice contains 15 g of sugar, what’s the concentration of sugar?

A. 30 g/L

B. 7.5 g/L

C. 3.33 g/L

D. 45 g/L

Question 6

6. The chemical formula for carbon dioxide is

A. CO.

B. C2O2.

C. CO2.

D. C2O.

Question 7

7. Which of the following is not produced by nuclear decay?

A. Beta particles

B. Gamma rays

C. Delta particles

D. Alpha particles

Question 8

8. Which of the following men did not help to advance the understanding of the atom?

A. Aristotle

B. Democritus

C. Dalton

D. Rutherford

Question 9

9. A baseball thrown from the outfield to home plate does not have which of the following types of energy while it’s in the air?

A. Radiant energy

B. Kinetic energy

C. Gravitational potential energy

D. Mechanical energy

Question 10

10. Which of the following is not a part of kinetic molecular theory?

A. Small particles make up all matter.

B. When temperature is increased, particles move more slowly.

C. Particles are in constant, random motion.

D. When particles collide, no energy is lost.

Question 11

11. A cold glass of iced tea warms quickly on a hot day through the process of

A. insulation.

B. expansion.

C. conversion.

D. conduction.

Question 12

12. In a solution if substance A makes up 1%, substance B makes up 9%, substance C makes up 20% and substance D makes up 70%, which substance would generally function as the solvent?

A. Substance B

B. Substance C

C. Substance A

D. Substance D

Question 13

13. The number of _______ in an atom of an element is the element’s atomic number.

A. electrons

B. neutrons

C. mass

D. protons

Question 14

14. What needs to happen for the equation CH4 + O2 ? CO2 + H2O to be balanced?

A. A coefficient of 2 must be added before the second reactant and the second product.

B. Nothing, the equation is already balanced.

C. A coefficient of 2 must be added before both products and reactants.

D. A coefficient of 2 must be added before both products.

Question 15

15. The number of valence electrons in an atom can often be quickly determined by referencing

A. the period number on the periodic table.

B. the group number on the periodic table.

C. the atomic number of the element.

D. the atomic mass of the element.

Question 16

16. Heat passes through liquids by the process of

A. radiation.

B. absorption.

C. conduction.

D. convection.

Question 17

17. The burning of fossil fuels results in which type of chemical reaction?

A. Combustion

B. Single-replacement

C. Synthesis

D. Decomposition

Question 18

18. A solution with higher pH levels is more

A. soluble.

B. neutral.

C. basic.

D. acidic.

Question 19

19. Which of the following statements about covalent bonds is false?

A. The resulting compound has a dull appearance.

B. The resulting compound can be dissolved in water.

C. The resulting compound is a poor conductor of electricity.

D. The bond can be formed only between nonmetals.

Question 20

20. Which of the following is not found in the nucleus of an atom?

A. Neutron

B. Proton

C. Quark

D. Electron

c