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1st Semester exam 25 review part 1

Total questions: 92

Worksheet time: 4hrs 28mins

Name
Class
Date
1.

2C6H14 + 19O2 --> 12CO2 + 14H2O

a)

combustion reaction

b)

synthesis reaction

c)

decomposition reaction

d)

single-displacement reaction

e)

double-displacement reaction

2.

Why are electrical forces necessary for elements to form compounds?

a)

the attraction of like charges forms chemical bonds

b)

the repulsion of like charges forms chemical bonds

c)

the attraction of opposite charges forms chemical bonds

d)

electrical forces hold the nucleus together

3.

What does this Lewis dot diagram tell you about the bond for HCN?

a)

It is a covalent bond

b)

Hydrogen and Carbon share 2 electrons

c)

Carbon and Nitrogen share 6 electrons

d)

All of these!

4.

Radium is an alkaline earth metal. What is its' oxidation number?

a)

1+

b)

1-

c)

2+

d)

2-

5.

The following chemical equation is balanced.

NiCl2 + 2NaOH --> Ni(OH)2 + 2NaCl

a)

True

b)

False

6.

Which of the following would increase the rate of a reaction? (MR)

a)

add a catalyst

b)

decrease the temperature

c)

add an inhibitor

d)

increase the concentration

e)

increase the surface area

7.

A bonfire is an _____ reaction.

a)

Endothermic

b)

Exothermic

8.

PbCl2 + AgNO3 --> Pb(NO3)2 + AgCl

a)

combustion reaction

b)

synthesis reaction

c)

decomposition reaction

d)

single-displacement reaction

e)

double-displacement reaction

9.

Is the following equation balanced or unbalanced?

MgCl2 + AgNO3 --> Mg(NO3)2 + AgCl

a)

Balanced

b)

Unbalanced

10.

An ___ is a reaction where more energy is absorbed. (MR)

a)

endergonic

b)

exergonic

c)

endothermic

d)

exothermic

11.

What is the name of this chemical compound

a)

aluminium Iodoxide

b)

aluminium oxide

c)

aluminium trioxide

d)

none of these

12.

Is the following equation balanced or unbalanced?

2Mg + O2 --> 2MgO

a)

Balanced

b)

Unbalanced

13.

Breaking chemical bonds ___ energy.

a)

releases

b)

absorbs

14.

NH3 + HCl --> NH4Cl

a)

combustion reaction

b)

synthesis reaction

c)

decomposition reaction

d)

single-displacement reaction

e)

double-displacement reaction

15.

An element's oxidation number tells you

a)

how many valence electrons it has

b)

how many protons are found in the nucleus

c)

how many electrons it gains or loses when bonding

d)

how many electrons it has

16.

A compound made of many charged atoms covalently bonded together.

a)

binary ionic compound

b)

binary covalent compound

c)

polyatomic ion

d)

double bonded covalent compound

17.

In order to balance the following equation, you can add a '2' after the Hg on the product side.

2HgO --> O2 + Hg

a)

True

b)

False

18.

An ____ reaction is where more energy is released than absorbed.(MR)

a)

endergonic

b)

exergonic

c)

endothermic

d)

exothermic

19.

"C6H12O6 + 6O2 --> 6CO2 + 6H2O + energy" is an ____ reaction.

a)

endergonic

b)

exergonic

20.

Forming chemical bonds ____ energy.

a)

releases

b)

absorbs

21.

Which of the following are ways to measure the rate of a chemical reaction? (MR)

a)

the surface area of the reactants

b)

how fast the reactants are used up

c)

how fast the products appear

d)

increase the temperature

e)

how fast energy is released

22.

"N2 + 3H2 + energy --> 2NH3" is an ____ reaction.

a)

endergonic

b)

exergonic

23.

_____ determine bonding behavior.

a)

negative ions

b)

positive ions

c)

sharing electrons

d)

valence electrons

24.

What is the ratio of hydrogen to oxygen in C6H12O6?

a)

12:6

b)

6:6

c)

2:1

d)

1:1

25.

In an ____ reaction, the products have more energy than the reactants. The energy can be electrical, light, heat, etc.

a)

exergonic

b)

endergonic

c)

exothermic

d)

endothermic

26.

The reason atoms bond is to ___.

a)

create new substances

b)

develop stable outer energy levels

c)

release energy

d)

absorb energy

27.

An atom is stable if it has

a)

a good relationship with friends

b)

forms a nonpolar bond

c)

has 8 electrons in its' outermost energy shell

d)

none of these!

28.
a)

ionic

b)

covalent

29.

A metal and a nonmetal form

a)

an ionic bond

b)

a covalent bond

c)

a salt

d)

both a and c

30.

If atoms bond by losing or gaining electrons they are forming

a)

hydrogen bonds

b)

covalent bonds

c)

polar bonds

d)

ionic bonds

31.

If atoms bond by sharing electrons they are forming

a)

hydrogen bonds

b)

covalent bonds

c)

nonpolar bonds

d)

ionic bonds

32.

What is the smallest particle in a covalent bond?

a)

an atom

b)

an ion

c)

a molecule

d)

none of these

33.

What is the smallest particle in an ionic bond?

a)

an atom

b)

an ion

c)

a molecule

d)

none of these

34.

What type of bond does carbon have with nitrogen in the compound HCN?

a)

It is a covalent bond

b)

a double covalent bond

c)

a triple covalent bond

d)

an ionic bond

35.

If the bonded atoms have slightly different electron charges at opposite ends of the molecule this forms a

a)

polar bond

b)

nonpolar bond

c)

polyatomic ion

d)

hydrogen bond

36.

A positive ion ____. (MR)

a)

has lost electrons

b)

has more electrons than protons

c)

has more electrons than neutrons

d)

has more protons than electrons

37.

In which of the following can you find acids? (MR)

a)

cleaning products

b)

antacid tablets

c)

carbonated drinks

d)

soap

e)

citrus fruit

38.

A substance with a pH of 2 is a ____.

a)

strong base

b)

weak base

c)

strong acid

d)

weak acid

39.

___ is a substance that changes color when exposed to an acid or a base.

a)

Litmus paper

b)

An indicator

c)

A neutralizer

d)

An alkaline

40.

When a base reacts with water it produces ___. (MR)

a)

positive ions

b)

negative ions

c)

hydronium ions

d)

hydroxide ions

41.

A substance with a pH of 11 is ___ times more alkaline than one with a pH of 8.

a)

10

b)

100

c)

1000

d)

10000

42.

A/An ___ is the precipitate/compound that forms when an acid reacts with a base.

a)

buffer

b)

ion

c)

salt

d)

neutralized solution

43.

Which of the following are properties of acids? (MR)

a)

taste bitter

b)

can cause burns to skin

c)

corrosive to metals

d)

taste sour

e)

turns red litmus paper blue

44.

A negative ion ____.

a)

has more electrons than neutrons

b)

has more protons than electrons

c)

has more electrons than protons

d)

has lost electrons

45.

A/An ___ is a substance that interacts with acids or bases to prevent them from affecting the pH.

a)

base

b)

acid

c)

buffer

d)

concentrated solution

46.

Neutralization ___. (MR)

a)

ionizes a base

b)

combines an acid with a base

c)

brings the pH closer to 7

d)

produces a salt and water

e)

ionizes an acid

47.

Bases on the pH scale are ____.

a)

greater than 7

b)

7

c)

less than 7

48.

The strength of an acid or base depends on ___.

a)

how much acid or base you have

b)

how far it is from 7, neutral

c)

the amount of ions produced in the reaction

d)

how close it is to 7, neutral

49.

A strong acid produces more ions and therefore does not conduct electricity as well.

a)

True

b)

False

50.

A substance with a pH of 8 is a ____.

a)

strong base

b)

weak base

c)

strong acid

d)

weak acid

51.

If a substance is said to be alkaline, it is ___. (MR)

a)

acidic

b)

basic

c)

an acid

d)

a base

52.

A solution that has a lot of solute dissolved in the solvent is a ____ solution.

a)

saturated

b)

dilute

c)

concentrated

d)

mixed up

53.

Neutral on the pH scale is ___.

a)

5

b)

6

c)

7

d)

8

54.

Which of the following are characteristic properties of bases? (MR)

a)

cleans dirt and grease

b)

taste sour

c)

can cause chemical burns to tissue

d)

corrosive to metals

e)

turns blue litmus paper red

55.

Weak acids transfer ___ electric current because they have ___ ions.

a)

more, fewer

b)

less, fewer

c)

more, more

d)

less, more

56.

When an acid reacts with water it produces ____. (MR)

a)

hydronium ions

b)

negative ions

c)

hydroxide ions

d)

positive ions

57.

A ___ is a substance that can transfer electrical current.

a)

salt

b)

acid

c)

base

d)

electrolyte

58.

A substance that has a little solute dissolved in the solvent is a ____ solution.

a)

concentrated

b)

dilute

c)

mixed up

d)

saturated

59.

An atom that is not neutral is a/an ___.

a)

isotope

b)

ion

c)

characteristic property

d)

pH

60.

A ___ solution has so much solute dissolved in the solvent, no more will dissolve.

a)

concentrated

b)

dilute

c)

saturated

d)

complicated

61.

A measure comparing the number of positive ions or the number of negative ions is ___.

a)

an acid

b)

a base

c)

pH

d)

alkalinity

62.

Bases are commonly found in soaps and cleaning products.

a)

True

b)

False

63.

Which of the following are properties common to both acids and bases? (MR)

a)

become electrolytes in water

b)

pH

c)

corrosive

d)

can damage tissue

e)

taste

64.

Acids on the pH scale are ___.

a)

greater than 7

b)

7

c)

less than 7

65.

The process by which the nucleus of a cell decaying and emitting matter and energy is called _______.

a)

an isotope

b)

ionization

c)

radioactivity

d)

nuclear fission

66.

Which of the following in NOT one of the 3 types of nuclear radiation?

a)

ionization

b)

alpha radiation

c)

beta radiation

d)

gamma radiation

67.

The process by which nuclei having low masses are united to form nuclei with a larger mass is ____.

a)

a chain reaction

b)

a chemical reaction

c)

nuclear fission

d)

nuclear fusion

68.

Which type of nuclear radiation is composed of 2 protons and 2 neutrons?

a)

alpha radiation

b)

beta radiation

c)

gamma radiation

d)

ionization

69.

Which type of nuclear radiation is composed of 1 electron?

a)

alpha radiation

b)

beta radiation

c)

gamma radiation

d)

ionization

70.

Which type of nuclear radiation is composed of electromagnetic waves?

a)

alpha radiation

b)

beta radiation

c)

gamma radiation

d)

ionization

71.

An element with a different number of neutrons in its nucleus than is shown on the Periodic Table of Elements is called ________.

a)

an ion

b)

an isotope

c)

a beta particle

d)

an alpha particle

72.

The process by which one element changes into another element due to nuclear decay is called _______.

a)

transmutation

b)

ionization

c)

metamorphosis

73.

Polonium 210 undergoes alpha decay. What will its mass number and atomic number be?

a)

mass number 214 atomic number 86

b)

mass number 206

atomic number 82

c)

mass number 210

atomic number 84

d)

mass number 210

atomic number 85

74.

Iodine 131 undergoes beta decay. What will its new mass number and atomic numbers be?

a)

mass number 131

atomic number 54

b)

mass number 135

atomic number 55

c)

mass number 131

atomic number 53

d)

mass number 127

atomic number 52

75.

What type of nuclear reaction is shown?

a)

fission

b)

gamma decay

c)

beta decay

d)

fusion

76.

What type of radiation is most penetrating?

a)

alpha decay

b)

beta decay

c)

gamma ray

77.

What is the nucleus of an isotope called before it decays?

a)

daughter nucleus

b)

parent nucleus

c)

son nucleus

d)

Uncle nucleus

78.

Which of the following is the process of splitting a nucleus into two or more smaller nuclei?

a)

nuclear fusion

b)

nuclear fission

c)

ionization

d)

transmutation

79.

The time required for half of the nuclei of an isotope to decay?

a)

ionization

b)

transmutation

c)

half - life

d)

beta decay

80.

What type of nuclear decay releases 2 protons and 2 neutrons?

a)

gamma decay

b)

beta decay

c)

ionization

d)

alpha decay

81.

The half-life of 14C is 5,730 years. How long would it take for a 100 gram sample of 14C to decay into 50 grams?

a)

5,730 years

b)

2,865 years

c)

11,460 years

d)

17,190 years

82.

Nuclear reactions involve particles in the ______.

a)

electron levels

b)

half-life

c)

nucleus

d)

beta particle

83.

Which is NOT true of chemical reactions?

a)

Chemical reactions involve the electrons of the elements

b)

Chemical reactions involve a change in the mass of the products

c)

The reactants and products in chemical reactions have an equal mass.

84.

A form of radiation that emits an electron is known as _____________.

a)

Beta radiation

b)

Alpha radiation

c)

Gamma radiation

d)

Daughter nucleus

85.

The form of radiation that emits energy but no mass or charge

a)

Alpha radiation

b)

Beta radiation

c)

Gamma radiation

d)

daughter nucleus

86.

Plutonium - 241 has a half life of 14 years. How many years would it take a 100 gram sample to decay to 25 grams?

a)

14 years

b)

42 years

c)

25 years

d)

28 years

87.

Which of the following IS NOT one the 4 fundamental forces?

a)

strong nuclear force

b)

electromagnetism

c)

the jedi force

d)

gravity

e)

weak nuclear force

88.

Which force is primarily responsible for holding protons and neutrons together in the nucleus of atoms

a)

gravity

b)

electromagnetic force

c)

weak nuclear force

d)

strong nuclear force

89.

Which force is primarily responsible for holding atoms together in molecules and compounds

a)

gravity

b)

strong nuclear force

c)

electromagnetic force

d)

weak nuclear force

90.

What is the name given to atoms of the same element that have different numbers of neutrons in their nucleus?

a)

ions

b)

isotopes

c)

protons

d)

it's complicated

91.

___________________ is the process of nuclei decaying and emitting matter and energy.

a)

radioactivity

b)

chemical breakdown

c)

isotope emission

92.

In general, where are most radioactive elements located on the periodic table?

a)

towards the top

b)

towards the middle

c)

towards the bottom

d)

there are no radioactive elements on the periodic table

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