Earth Science: Geology, the Environment, and the Universe

Section 2: How Atoms Combine

How Atoms Combine

1
Why does a water molecule have a bent shape?
A)because it occurs on Earth as a solid, liquid, and a gas
B)it's a compound
C)it has ionic bonds
D)it's a polar molecule
2
What is an ion?
A)a molecule
B)an isotope
C)a charged particle
D)a gas
3
According to the table, which material tested underwent a chemical change when vinegar was added?
Material TestedAddition of VinegarAddition of IodineHeated with candle
Distilled waterNo changeNo changeBoiled
CornstarchNo changeTurns blueNo change
SugarNo changeNo changeMelts
Baking sodaFizzing takes placeNo changeNo change
Mystery mixtureFizzing takes placeTurns blueNo change

A)baking soda
B)sugar
C)distilled water
D)cornstarch
4
What is the attractive force between two particles of opposite charge called?
A)a compound force
B)a covalent bond
C)an ionic bond
D)an isotope
5
The attraction of two atoms for a shared pair of electrons that hold the atoms together is called __________.
A)an ionic bond
B)a covalent bond
C)a compound
D)a chemical reaction
6
An Mg +2 particle has __________ electrons.
A)lost two
B)gained one
C)lost four
D)gained two
7
What type of bond is shown in the figure?
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A)hydrogen
B)ionic
C)metallic
D)covalent
8
What makes an element stable?
A)if its outermost energy level is full
B)if it has the same number of neutrons and protons
C)if it has a covalent bond
D)if its nucleus is packed tightly
9
Bases produce __________ in solution.
A)helium ions
B)hydrogen ions
C)oxygen ions
D)hydroxide ions
10
A __________ is composed of two or more atoms held together by covalent bonds.
A)a gas
B)molecule
C)ionic bond
D)covalent bond
11
Predict what will happen to the zinc shown in the higher concentration of acid, as shown in the figure.
A)it will not affect the rate at which it dissolves
B)it will form a covalent bond with the acid
C)it will dissolve slower
D)it will dissolve faster
12
What type of bond is shown in the figure?
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A)ionic
B)metallic
C)hydrogen
D)covalent
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