Question 1

Which of the following best defines Chemistry?

Accepted Answer

The study of the composition, structure, properties, and changes of matter.

Question 2

How many significant figures are in the measurement 0.0045200?

Accepted Answer

5

Question 3

A runner completes a 5.00 km race. Convert this distance to meters using dimensional analysis.

Accepted Answer

$$5.00 	imes 10^3$ meters

Question 4

Which of the following correctly converts 250 micrograms ($$\mug) to $$grams (g)?

Accepted Answer

$$2.5 	imes 10$$^{-5}$$ g

Question 5

A metal cube has a mass of 54.0 g and a volume of 18.0 cm$$^3. $$What is its density?

Accepted Answer

$$3.00\ \mathrm{g/cm^3$}$$

Question 6

Which of the following is the correct sequence of steps in the scientific method?

Accepted Answer

Observation, Hypothesis, Experiment, Law, Theory

Question 7

Which of the following statements about uncertain digits is correct?

Accepted Answer

The last digit in a measured value is always uncertain.

Question 8

Which of the following is a compound?

Accepted Answer

Water ($$H_2O)$$

Question 9

Which of the following best describes a homogeneous mixture?

Accepted Answer

A mixture with uniform composition throughout, such as salt water.

Question 10

Which of the following is a chemical change?

Accepted Answer

Iron rusting in air

Question 11

Which of the following reactions is endothermic?

Accepted Answer

Photosynthesis in plants

Question 12

How much heat (in Joules) is required to raise the temperature of 100.0 g of water from 25.0 $$^\circC to 75.0$$ $$^\circC$$? (Specific heat of water $$= 4.18\ \mathrm{J/g\cdot ^\circ C})$$

Accepted Answer

$$2.09 	imes 10^4$ J

Question 13

Which separation technique would be most appropriate to separate a mixture of sand and salt?

Accepted Answer

Dissolve in water, filter, then evaporate water

Question 14

Which statement best describes the Law of Conservation of Mass?

Accepted Answer

Mass is neither created nor destroyed in a chemical reaction.

Question 15

Which of the following is NOT a form of energy?

Accepted Answer

Density

Question 16

Which scientist is credited with discovering the electron?

Accepted Answer

J.J. Thomson

Question 17

Which subatomic particle has a mass of approximately $$1\ \mathrm{amu}$$ and no charge?

Accepted Answer

Neutron

Question 18

What is the most common charge for an oxygen atom when it forms an ion?

Accepted Answer

$$-2$$

Question 19

A sample of chlorine contains 75.77% $$^{35}Cl ($$mass = 34.97 amu) and 24.23% $$^{37}Cl ($$mass = 36.97 amu). What is the average atomic mass of chlorine?

Accepted Answer

$$35.45$$ amu

Question 20

Which of the following is the empirical formula for glucose ($$C_6H_{12}O_6$)?

Accepted Answer

$$CH_2O$$

Introduction to Chemistry: Exam 1 Study Guide

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