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Chapter 9 Review - Moles & Mass-Mole Conversions

Authored by Stephanie Haas

Chemistry

10th - 12th Grade

Used 2+ times

Chapter 9 Review - Moles & Mass-Mole Conversions
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26 questions

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1.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

The LD50 of saccharin is 17.0 g/kg. What is the lethal dose for a person who weighs 165 pounds?

107 mg

10.7 g

107 g

1.28 kg

2.

MULTIPLE CHOICE QUESTION

2 mins • 1 pt

How many mg of table salt (LD50= 3000 mg/kg) would be a lethal dose for a 44 lb child?

60,000 mg

30,000 mg

6 g

3 g

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which substance is most toxic?

table salt (LD50 = 3000 mg/kg)

aspirin (LD50 = 200 mg/kg)

cola (LD50 = 127 mg/kg)

vitamin A (LD50 =1510 mg/kg)

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which substance is the least toxic?

lorchel mushroom (LD50 = 320 mg/kg)

arsenic oxide (LD50 =15 mg/kg)

soft drink (LD50 = 127 mg/kg)

vitamin A (LD50 = 1510 mg/kg)

5.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

What would be the best way to get a sample of 1000 beans by using mass?

Weigh 20 beans and collect a sample that is 100xs that

Weigh 10 beans and collect a sample that is 1000xs that

Weigh 1 bean and collect a sample that weighs 1000xs that

Weigh 20 beans and collect a sample that weighs 50xs that

6.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

Which has a smaller percent error if the actual value is 126: a calculated value of 123 or 129?

A calculated value of 129 has the smaller error.

A calculated value of 123 has the smaller error.

The percent error is the same for both.

There is not enough information to answer the question.

7.

MULTIPLE CHOICE QUESTION

1 min • 1 pt

The expected weight of 100 clips is 503 g. The actual weight is 495 g. What is percent error?

8.0%

1.6%

4.0%

0.16%

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