Chemistry Concepts and Calculations Review

How many significant figures are in the number 0.004560?

• 3

• 4

• 5

• 6

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DOK Level 1: Recall

• 15.3445

• 15.34

• 15.3

• 15.345

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DOK Level 2: Skill/Concept

Which of the following is an SI base unit?

• Liter

• Gram

• Meter

• Celsius

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DOK Level 1: Recall

A student measures the mass of a substance to be 5.2 g, but the actual mass is 5.0 g. What is the percent error of the student's measurement?

• 2%

• 4%

• 5%

• 10%

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DOK Level 2: Skill/Concept

What is the mass number of an atom with 20 protons, 20 neutrons, and 18 electrons?

• 38

• 40

• 42

• 58

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DOK Level 1: Recall

Describe the atomic structure of an atom with an atomic number of 6 and a mass number of 14.

• 6 protons, 6 neutrons, 6 electrons

• 6 protons, 8 neutrons, 6 electrons

• 6 protons, 8 neutrons, 8 electrons

• 8 protons, 6 neutrons, 6 electrons

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DOK Level 2: Skill/Concept

Which subatomic particle has a positive charge?

• Electron

• Neutron

• Proton

• Positron

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DOK Level 1: Recall

A block of metal has a mass of 150 g and a volume of 50 cm³. What is its density?

• 2 g/cm³

• 3 g/cm³

• 4 g/cm³

• 5 g/cm³

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DOK Level 2: Skill/Concept

Explain how the discovery of the electron led to the development of the modern atomic model.

• It showed that atoms are indivisible.

• It led to the plum pudding model, which was later replaced by the nuclear model.

• It confirmed that atoms are mostly empty space.

• It proved that electrons orbit the nucleus in fixed paths.

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DOK Level 3: Strategic Thinking

Given the atomic number and mass number, how can you determine the number of neutrons in an atom?

• Subtract the atomic number from the mass number.

• Add the atomic number to the mass number.

• Subtract the mass number from the atomic number.

• Divide the mass number by the atomic number.

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DOK Level 2: Skill/Concept