PERCENTAGE COMPOSITION

PERCENTAGE COMPOSITION

9th Grade

10 Qs

quiz-placeholder

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PERCENTAGE COMPOSITION

PERCENTAGE COMPOSITION

Assessment

Quiz

Chemistry

9th Grade

Hard

Created by

Mae Racelis

Used 4+ times

FREE Resource

10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

What is percentage composition?

The mass of a compound divided by its molar mass.

The ratio of the mass of each element in a compound to the total mass of the compound, expressed as a percentage.

The percentage of a compound that is composed of oxygen atoms.

The percentage of a compound that is composed of hydrogen atoms.

2.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

How is the percentage composition of a compound calculated?

By dividing the mass of a compound by its volume.

By dividing the mass of each element in the compound by the molar mass of the compound and multiplying by 100%.

By subtracting the mass of each element in the compound from the total mass of the compound.

By multiplying the mass of each element in the compound by the molar mass of the compound.

3.

MULTIPLE CHOICE QUESTION

1 min • 2 pts

What is the percentage composition of water (H2O)?

(Atomic mass: H=1, O=16)

11.11% hydrogen, 88.89% oxygen

50% hydrogen, 50% oxygen

33.33% hydrogen, 66.67% oxygen

20% hydrogen, 80% oxygen

4.

MULTIPLE CHOICE QUESTION

1 min • 2 pts

                                 

What is the percentage composition of carbon dioxide (CO2)?

(Atomic mass: C=12, O=16)

27.27% carbon, 72.73% oxygen

50% carbon, 50% oxygen

40% carbon, 60% oxygen

90% carbon, 10% oxygen

5.

MULTIPLE CHOICE QUESTION

1 min • 2 pts

What is the percentage composition of methane (CH4)?

(Atomic mass: C=12, H=1)

25% carbon, 75% hydrogen

50% carbon, 50% hydrogen

75% carbon, 25% hydrogen

90% carbon, 10% hydrogen

6.

MULTIPLE CHOICE QUESTION

30 sec • 2 pts

Which of the following represents the percentage composition of ammonia (NH3)?

16.67% nitrogen, 83.33% hydrogen

25% nitrogen, 75% hydrogen

   82.35% nitrogen, 17.65% hydrogen

50% nitrogen, 50% hydrogen

7.

MULTIPLE CHOICE QUESTION

1 min • 2 pts

What is the percentage composition of sulfuric acid (H2SO4)?

(Atomic mass: H=1, S=32, O=16)

2.08% hydrogen, 32.65% sulfur, 65.27% oxygen

4.17% hydrogen, 32.65% sulfur, 63.18% oxygen

4.17% hydrogen, 65.27% sulfur, 30.56% oxygen

4.17% hydrogen, 16.33% sulfur, 79.50% oxygen

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