Half Book 1

1

Ibrahim is learning about electron affinity. He knows that electron affinity is the energy change when an electron is added to a gaseous atom. Which group has the most negative electron affinities (most favorable)?

A Alkali metals B Halogens C Noble gases D Alkaline earth metals

2

Concentration of a solution means:

A Color of solution B Amount of solvent only C Amount of solute in given solvent D Temperature of solution

3

Which molecule is polar?

A O2 B N2 C HCl D H2

4

Ibrahim is studying gram molecular mass. He knows that the gram molecular mass of a compound is the mass of one mole of molecules of that compound. What is the gram molecular mass of CO2? (C=12, O=16)

A 28 g B 44 g C 56 g D 72 g

5

Metals are generally found on which side of the periodic table?

A Right side B Left side C Center only D Bottom only

6

The mole is a unit used to measure:

A Mass B Volume C Amount of substance D Density

7

Which property depends on amount of matter?

A Density B Color C Mass D Melting point

8

Pressure has no effect on equilibrium when:

A Reaction is slow B Only solids are involved C Equal moles of gas are present D Catalyst is added

9

Xia is studying the conditions for equilibrium. She learns that equilibrium is a dynamic process. Which of the following is an example of a system at dynamic equilibrium?

A A sealed container of water and ice at 0°C B A burning candle C A piece of iron rusting D A glass of soda losing its fizz

10

Which statement best describes a redox reaction?

A Only oxidation occurs B Only reduction occurs C Oxidation and reduction occur together D No electron transfer occurs

11

A double bond involves sharing of how many electrons?

A One pair B Two pairs C Three pairs D Four pairs

12

Which branch is concerned with chemical tests in laboratories?

A Analytical chemistry B Industrial chemistry C Nuclear chemistry D Environmental chemistry

13

Zayn is studying chemical equilibrium. He learns that the equilibrium constant (K) for a reaction is constant at a given temperature. If K is very large, what does it indicate about the reaction?

A The reaction proceeds almost to completion B The reaction hardly proceeds at all C The reaction is in the middle D The reaction is very slow

14

Bilal is studying dynamic equilibrium. He understands that at equilibrium, the rate of the forward reaction equals the rate of the reverse reaction. What is the state of the concentrations of reactants and products at equilibrium?

A They are equal B They are constant but not necessarily equal C They are zero D They are continuously changing

15

Xia is studying the uniqueness of proton number. She learns that the number of protons determines the identity of an element. What is the term for the number of protons in an atom?

A Mass number B Atomic number C Neutron number D Electron number

16

Ming is studying empirical and molecular formulas. He knows that the empirical formula is the simplest ratio of atoms, while the molecular formula is the actual number. For a compound with empirical formula CH and molecular mass 78, what is the molecular formula? (C=12, H=1)

A C6H6 B C2H2 C C3H3 D C4H4

17

Which molecule is non-polar?

A H2O B NH3 C O2 D HCl

18

Which branch studies chemicals present in the environment?

A Industrial chemistry B Environmental chemistry C Polymer chemistry D Nuclear chemistry

19

Subshells are denoted by:

A K, L, M B s, p, d, f C A, B, C D X, Y, Z

20

Which quantity is conserved in a chemical reaction?

A Volume B Mass C Temperature D Energy only

21

Decrease in temperature favors:

A Endothermic reaction B Exothermic reaction C Both equally D No change

22

Waseem is studying the energy changes in respiration. He knows that anaerobic respiration produces less ATP than aerobic respiration. How many ATP molecules are produced from one glucose molecule in anaerobic respiration?

A 2 ATP B 36 ATP C 4 ATP D 18 ATP

23

Which unit is used for molar mass?

A g B mol C g/mol D kg/mol

24

Mohamed is learning about isotopes. He understands that isotopes are atoms of the same element with different mass numbers. What is the reason for this difference?

A Different number of protons B Different number of electrons C Different number of neutrons D Different number of nuclei

25

Particles of matter are always in:

A Rest B Motion C Sleep D Vacuum