Chemistry First Semester Practice Exam Multiple Choice ...

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Chemistry First Semester Practice Exam

Multiple Choice Questions

1) What is the approximate total number of atoms in 1.0 mole of lithium?

(a) 1.0 ? 1023 (b) 6.0 ? 1023

(c) 3.0 (d) 6.9

2) In which list can all particles be accelerated by an electric field?

(a) alpha particles, beta particles, and neutrons (b) alpha particles, beta particles, and protons (c) alpha particles, protons, and neutrons (d) beta particles, protons, and neutrons

5) Given the nuclear equation:

14 7

N+X

16 8

O+

2 1

H

What is particle X?

(a) an alpha particle (b) a beta particle

(c) a deuteron (d) a triton

6) Which type of radiation is most similar to high-energy x rays?

(a) alpha (b) beta

(c) neutron (d) gamma

3) Which reaction is matched correctly with the particle represented by letter X ?

(a)

226 88

Ra

222 86

Rn + X; X is

an

alpha particle.

(b)

234 90

Th

234 91

Pa + X;

X

is

an

alpha

particle.

(c)

230 90

Th

226 88

Ra + X; X is a

beta

particle.

(d)

234 92

U

230 90

Th + X;

X

is

a beta

particle.

4) Within Period 2 of the Periodic Table, as the atomic number increases, the atomic radius generally

(a) decreases (b) increases

(c) remains the same

7) Which type of bond exists between an atom of carbon and an atom of fluorine?

(a) ionic (b) metallic

(c) polar covalent (d) nonpolar covalent

8) At which location in the Periodic Table would the most active metallic element be found?

(a) in Group 1 at the top (b) in Group 1 at the bottom (c) in Group 17 at the top (d) in Group 17 at the bottom

9) Given the reaction:

2C2H2(g) + 5O2(g) 4CO2(g) + 2H2O(g)

What is the total number of grams of O2(g) needed to react completely with 0.50 mole of C2H2(g)?

(a) 10. g (b) 40. g

(c) 80. g (d) 160 g

10) Given the unbalanced equation:

N2(g) + O2(g) N2O5(g)

When the equation is balanced using smallest whole numbers, the coefficient of N2(g) will be

(a) 1 (b) 2

(c) 5 (d) 4

11) Which atom will form an ionic bond with a Br atom?

(a) N (b) Li

(c) O (d) C

12) Which atoms are isotopes of the same element?

(a)

24 12

X and

25 12

X

(b)

20 10

X and

20 11

X

(c)

31 15

X and

32 16

X

(d)

31 19

X and

31 19

X

13) Given the equation:

H2(g) + Cl2(g) 2HCl(g)

What is the total number of moles of HCl(g) produced when 3 moles of H2(g) is completely consumed?

(a) 5 moles (b) 2 moles

(c) 3 moles (d) 6 moles

14) According to the periodic table, which of the following elements most readily loses an electron?

(a) F (b) Ne (c) Li (d) C

15) What is the total number of neon atoms contained in 20.2 grams of neon gas?

(a) 1.01 ? 1024 (b) 2.02 ? 1024

(c) 3.01 ? 1023 (d) 6.02 ? 1023

16) 24 grams of carbon equals how many moles? (a) 1 (b) 2 (c) 3 (d) 4

17) Which properties are most common in nonmetals? (a) low ionization energy and low electronegativity (b) low ionization energy and high electronegativity (c) high ionization energy and low electronegativity (d) high ionization energy and high electronegativity

18) Which shows the correct Lewis structure for H2O?

(a) H O H

H

(b)

OH

(c) H O H

(d) H O H

19) The forces between atoms that create chemical bonds are the result of interactions between (a) nuclei (b) electrons (c) protons and electrons (d) protons and nuclei

20) Which molecule exhibits covalent bonding? (a) LiF (b) CO2 (c) KBr (d) CaCl2

21) Which pair of atoms is held together by a covalent bond?

(a) HCl (b) LiCl

(c) NaCl (d) KCl

22) Given the reaction:

226 88

Ra

222 86

Rn + X

Which type of emanation is represented by X?

(a) alpha particle (b) beta particle

(c) proton (d) positron

23) Which list is in order of increasing penetrating strength?

(a) Alpha, gamma, beta (b) Alpha, beta, gamma (c) Gamma, alpha, beta (d) Gamma, beta, alpha

24)

The

atomic

mass

unit

is

defined

as

exactly

1 12

the

mass

of an atom of

(a)

12 6

C

(b)

14 6

C

(c)

24 12

Mg

(d)

26 12

Mg

25) In a salt crystal, NaCl, how does the number of positive sodium ions compare with the number of negative chloride ions?

(a) The number of positive ions is less than the number of negative ions.

(b) The number of positive ions is more than the number of negative ions.

(c) The number of positive ions is equal to the number of negative ions.

(d) It depends on the particular crystal.

26) How are protons held together in the nucleus of an atom?

(a) Nuclear forces (b) Electromagnetic attraction (c) Electromagnetic repulsion (d) Rotational inertia

27) As the elements of Group l are considered in order from top to bottom, the first ionization energy of each successive element will

(a) decrease (b) increase

(c) remain the same

28) What is the total number of molecules in a 0.5-mole sample of He gas?

(a) 6 ? 1023 (b) 2 ? 1023

(c) 3 ? 1023 (d) 4 ? 1023

29) Which elements are both classified as metalloids?

(a) Ge and As (b) Bi and Po

(c) B and C (d) Si and P

30) Which pair of atoms will share electrons when a bond is formed between them?

(a) Ba and I (b) Br and CI

(c) K and CI (d) Li and I

31) Which bond exists between the atoms in a water molecule?

(a) Ionic (b) Covalent (c) Ionic and covalent (d) Hydrogen

32) Which particles may be gained, lost, or shared by an atom when it forms a chemical bond?

(a) protons (b) electrons

(c) neutrons (d) nucleons

33) Which element in Group 1 has the greatest tendency to lose an electron?

(a) cesium (b) rubidium

(c) potassium (d) sodium

34) Given the reaction:

4Al(s) + 3O2(g) 2Al2O3(s)

What is the minimum number of grams of oxygen gas required to produce 1.00 mole of aluminum oxide?

(a) 32.0 g (b) 48.0 g

(c) 96.0 g (d) 192 g

35) What is the total number of valence electrons in an atom of boron in the ground state?

(a) 1 (b) 7

(c) 3 (d) 5

36) What is the total number of protons and neutrons in

an atom of

86 37

Rb?

(a) 37

(c) 86

(b) 49

(d) 123

37) Which type of radiation has zero mass and zero charge?

(a) alpha (b) beta

(c) neutron (d) gamma

38) The elements known as the alkaline earth metals are found in Group

(a) 1 (b) 2

(c) 16 (d) 17

39) Atoms of which element have the weakest attraction for electrons?

(a) Na (b) P

(c) Si (d) S

40) In which set do the elements exhibit the most similar chemical properties?

(a) N, O, and F (b) Hg, Br, and Rn

(c) Li, Na, and K (d) Al, Si, and P

41) Which subatomic particle is found in the nucleus of all isotopes of hydrogen?

(a) proton (b) neutron

(c) electron (d) positron

42)

In the equation

234 90

Th

234 91

Pa + X

the symbol

X represents

(a)

0 +1

e

(b)

0 -1

e

(c)

1 0

n

(d)

1 1

H

43) What is the total number of moles of sulfur atoms in 1 mole of Fe2(SO4)3?

(a) 1 (b) 15

(c) 3 (d) 17

44) Given the unbalanced equation.

CaSO44 + AlCl3 Al2(SO4)3 + CaCl2

What is the coefficient of Al2(SO4)3 when the equation is completely balanced using the smallest wholenumber coefficients?

(a) 1 (b) 2

(c) 3 (d) 4

45) Atoms of which set of elements all exhibit the same oxidation state?

(a) actinoid series (b) metalloids (c) alkaline earth metals (d) transition metals

46) Which noble gas has the highest first ionization energy?

(a) radon (b) krypton

(c) neon (d) helium

47) Which statement explains why fusion reactions are difficult to initiate?

(a) Positive nuclei attract each other. (b) Positive nuclei repel each other. (c) Neutrons prevent nuclei from getting close enough

to fuse. (d) Electrons prevent nuclei from getting close enough

to fuse.

48) Which statement describes the elements in Period 3?

(a) Each successive element has a greater atomic radius.

(b) Each successive element has a lower electronegativity.

(c) All elements have similar chemical properties. (d) All elements have valence electrons in the same

principal energy level.

49) Which electron dot symbol represents the atom in Period 4 with the highest first ionization energy?

(a)

(c)

(b)

(d)

50) If M represents an alkali metal, what is the formula for the compound formed by M and oxygen?

(a) MO2 (b) M2O

(c) M2O3 (d) M3O2

51) What is the charge and mass of a proton?

(a) charge of +1 and mass of 1 amu

(b)

charge of +1 and mass of

1 1836

amu

(c) charge of -1 and mass of 1 amu

(d)

charge of -1 and mass of

1 1836

amu

Chemistry First Semester Practice Exam Batten

1) b 2) b 3) a 4) a 5) a 6) d 7) c 8) b 9) b 10) b 11) b 12) a 13) d 14) c 15) d 16) b 17) d 18) d 19) c 20) b 21) a 22) a 23) b 24) a 25) c 26) a 27) a 28) c 29) a 30) b 31) b 32) b 33) a 34) b 35) c 36) c 37) d 38) b 39) a 40) c 41) a 42) b 43) c 44) a 45) c 46) d 47) b 48) d 49) d

Answer Key Multiple Choice Questions

50) b 51) a

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