Balancing Chemical Equations Flashcards

1
Q

How many carbon atoms are represented below?

A

1

(There is one carbon atom in one molecule of methane. The carbon atom is the black atom in the center)

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2
Q

How many oxygen atoms are represented below?

A

4

(Count the 4 red atoms in the two oxygen molecules)

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3
Q

How many carbon atoms are represented below?

A

1

(Its the black one in the middle)

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4
Q

How many water molecules are represented below?

A

2 water molecules

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5
Q

How many atoms, total, are represented below?

A

9

(count ‘em)

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6
Q

How would you represent the molecule below in a chemical equation?

A
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7
Q

How would you represent what is below in a chemical equation?

A
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8
Q

Look at the chemical equation below. How many molecules of methane (CH4) are shown?

CH4 + 2O2 → CO2 + 2H2O

A

1

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9
Q

How would you represent what is below in a chemical equation?

A
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10
Q

How would you represent what is below in a chemical equation?

A
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11
Q

How would you represent what is below in a chemical equation?

A

CO2 + 2H2O

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12
Q

How would you represent what is below in a chemical equation?

A

CH4 + 202

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13
Q

What is the chemical formula for this compound?

A

Fe2O3

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14
Q

What is the chemical formula for this?

A

3Fe2O3

(3 molecules of Iron Oxide)

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15
Q

What is the chemical formula for this?

A

4Na

(Four individual atoms of Sodium)

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16
Q

What is the chemical formula for this?

A

ZnCl2

(One molecule of zinc chloride)

17
Q

What is the chemical formula for this?

A

4ZnCl<span>2</span>

(Four molecules of zinc chloride)

18
Q

What is the chemical formula for this?

A

NaCl

19
Q

What is the chemical formula for this?

A

3NaCl

20
Q

What is the chemical formula for this?

A

Cl2

(One molecule of chlorine)

21
Q

What is the chemical formula for this?

A

5Cl2

(5 molecules of chlorine)

22
Q

What is the chemical formula for this?

A

Zn(OH)2

(One molecule of zinc hydroxide)

23
Q

What is the chemical formula for this?

A

3Zn(OH)<span>2</span>

(3 molecules of zinc hydroxide)

24
Q

What is the chemical formula for this?

A

CaBr2

(one molecule of calcium bromide)

25
Q

What is the chemical formula for this?

A

3CaBr2

(3 molecules of calcium bromide)

26
Q

What is the chemical formula for this?

A

H<span>2</span>0

(One molecule of water)

27
Q

What is the chemical formula for this?

A

6H20

(6 molecules of water)

28
Q

You will see this little guy often. What is he?

A

Hydroxide

(Oxygen and Hydrogen pair up like this so often, we sometimes just treat them like a single object.)

29
Q

What is the chemical formula for this?

A

3OH

(If these three hydroxide groups were part of a larger molecule, perhaps stuck onto an aluminum atom, you might see them represented as follows:

Al(OH)3

30
Q

What is the chemical formula for this?

A

Al(OH)3

(one molecule of aluminum hydroxide)

31
Q

What is the chemical formula for this?

A

2Al(OH)3

(2 molecules of aluminum hydroxide)