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Multiple Choice
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1

Which of the following terms best describes a well mixed cup of coffee with sugar?
A)pure substance
B)heterogeneous mixture
C)homogeneous mixture
D)compound
2

Hydrogen and oxygen are combined to form water. What term best describes this process?
A)chemical change
B)physical change
C)mixing
D)phase change
3

Select the best description of an element.
A)A pure substance that can be decomposed by a chemical change into simpler substances.
B)Matter made of unlike parts and a variable composition.
C)Matter made of unlike parts and a fixed composition.
D)A pure substance that cannot be broken down into anything simpler by chemical or physical means.
4

Select the correct statement about elements.
A)Some elements are artificially made.
B)CA is the correct way of writing the symbol for calcium.
C)Hydrogen is the most abundant element found on earth.
D)Chemical symbols do not refer to single atoms, but to the element in general.
5

What is a particle composed of two or more atoms held together by an attractive force called?
A)chemical bond
B)element
C)molecule
D)relative atom
6

Select the term that describes the smallest particle of a compound that can exist and still retain the characteristic chemical properties of a substance.
A)molecule
B)atom
C)electron
D)nucleus
7

Which one of the following is an example of a chemical reaction?
A)hydrogen and oxygen combine to form water
B)water boils to form steam
C)sugar mixes with water to form sugar solution
D)water freezes to form ice
8

In a chemical reaction A and B use energy to react yielding C. Select the correct description of this reaction.
A)A, B, and, C are the reactants
B)A, B, and, C are the products
C)A and B are the products and C is the reactant
D)A and B are the reactants and C is the product
9

Select the correct description of valence electrons.
A)electrons that occupy the inner energy level
B)electrons that occupy the outer energy level
C)electrons that do not participate in chemical bonding
D)electrons in noble gas atoms
10

Select the correct description of the octet rule. Representative elements
A)have eight electrons in their outermost energy level.
B)attempt to lose eight electrons.
C)attempt to acquire an outer orbital with eight electrons.
D)attempt to acquire eight electrons.
11

What does the symbol Mg2+ represent?
A)A magnesium atom that has acquired two electrons.
B)A magnesium atom with two protons.
C)A magnesium atom with two electrons.
D)A magnesium atom that has lost two electrons.
12

What is the attractive force that holds atoms together in a compound?
A)chemical energy
B)chemical bond
C)magnetic force
D)atomic force
13

Atoms A and B have achieved the noble gas structure by sharing electrons. Select the correct statement about A and B.
A)A and B have formed a covalent bond.
B)A and B have formed a metallic bond.
C)A and B have formed an ionic bond.
D)Either A or B must be a metal.
14

Atoms A and B have achieved the noble gas structure by transferring electrons. Select the correct statement about A and B.
A)A and B have formed a covalent bond.
B)A and B have formed a metallic bond.
C)A and B have formed an ionic bond.
D)Both A and B must be metals.
15

What is the energy released in the formation of an ionic compound called?
A)chemical energy
B)internal potential energy
C)heat of formation
D)formation energy
16

Select the correct statement about ionic compounds.
A)Usually they have a metallic look.
B)Usually they are crystalline.
C)Usually it is difficult to dissolve them in water.
D)They never contain a transition element.
17

Select the correct statement about the ionic compound AlCl3.
A)AlCl3 has one Al+ ion for every Cl3- ion.
B)AlCl3 has one Al+ ion for three Cl- ions.
C)AlCl3 has one Al3+ ion for every Cl- ion.
D)AlCl3 has one Al3+ ion for three Cl- ions.
18

What is the name of a chemical reaction in which electrons are transferred from one atom to another?
A)oxidation
B)reduction
C)redox
D)combustion
19

What are substances that take electrons from other substances called?
A)reducing agents
B)oxidizing agents
C)redox
D)hydrocarbons
20

What type of reaction has the general form X + Y → XY.
A)ion exchange
B)replacement
C)decomposition
D)combination
21

What type of reaction has the general form XY → X + Y.
A)ion exchange
B)replacement
C)decomposition
D)combination
22

What type of reaction has the general form XY + Z → XZ + Y.
A)ion exchange
B)replacement
C)decomposition
D)combination
23

What type of reaction has the general form AX + BY → AY + BX.
A)ion exchange
B)replacement
C)decomposition
D)combination
24

Choose the correct statement about combination and decomposition reactions.
A)Burning of nonmetals in air leads to a combination reaction.
B)Burning of nonmetals in air leads to a decomposition reaction.
C)Energy in the form of heat or electric current is released in decomposition reactions.
D)Energy in the form of heat or electric current is required for combination reactions.
25

According to the activity series, lead can hold its electrons better than chromium. Based on this information choose the incorrect statement.
A)Chromium must be chemically more active than lead.
B)Lead must be chemically more active than chromium.
C)Chromium will replace any lead ion in solution.
D)The energy involved in replacement reactions is usually less than the energy involved in combination or decomposition reactions.





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