Q: Convert 5.00 kilometers to meters using dimensional analysis.

$$5.00 \times 10^3$\ \mathrm{m}$$

Question 1

Which of the following best describes a scientific theory?

Accepted Answer

A well-tested explanation for a broad set of observations that can be used to make predictions.

Question 2

A student measures the mass of a sample as 0.00450 g. How many significant figures are in this measurement?

Accepted Answer

3

Question 3

Which of the following is an example of a heterogeneous mixture?

Accepted Answer

Salad with lettuce, tomatoes, and cucumbers

Question 4

A block of metal has a mass of 250 g and a volume of 50.0 cm$$^3. $$What is its density?

Accepted Answer

$$5.00\ \mathrm{g/cm^3$}$$

Question 5

Which of the following changes is a chemical change?

Accepted Answer

Burning wood

Question 6

Which statement about kinetic and potential energy is correct?

Accepted Answer

Kinetic energy increases as an object's speed increases.

Question 7

Which scientist is credited with discovering the electron?

Accepted Answer

J. J. Thomson

Question 8

Rutherford’s gold foil experiment led to which major conclusion about atomic structure?

Accepted Answer

Atoms have a small, dense, positively charged nucleus.

Question 9

Which of the following is a correct example of scientific notation for the number 0.00036?

Accepted Answer

$$3.6 	imes 10$$^{-4}$$

Question 10

A patient receives a medication dosage of 0.75 mg/kg. If the patient weighs 60.0 kg, how many milligrams of medication should be administered?

Accepted Answer

$$45\ \mathrm{mg}$$

Question 11

Which of the following best describes an isotope?

Accepted Answer

Atoms of the same element with different numbers of neutrons.

Question 12

Which of the following elements is a noble gas?

Accepted Answer

Neon (Ne)

Question 13

Which of the following statements about the periodic table is correct?

Accepted Answer

Main group elements are found in groups 1, 2, and 13-18.

Question 14

If an atom gains two electrons, what is the resulting ion called?

Accepted Answer

Anion with a $$2^-$$ charge

Question 15

Which of the following is a physical property?

Accepted Answer

Melting point

Question 16

A sample of gas occupies 2.50 L at 1.00 atm. If the pressure is increased to 2.00 atm at constant temperature, what is the new volume? (Use $$P_1V_1 = P_2V_2)$$

Accepted Answer

$$1.25\ \mathrm{L}$$

Question 17

Which of the following best describes a pure substance?

Accepted Answer

A substance with a fixed composition and distinct properties

Question 18

Which of the following is the correct symbol for the element potassium?

Accepted Answer

K

Question 19

Which of the following best describes the difference between a hypothesis and a scientific law?

Accepted Answer

A hypothesis is a proposed explanation that can be tested, while a law is a statement that describes a consistent natural phenomenon.

Question 20

Convert 5.00 kilometers to meters using dimensional analysis.

Accepted Answer

$$5.00 	imes 10^3$\ \mathrm{m}$$

Exam 1 Study Guide: Introduction to Chemistry, Measurement, Matter, and Atomic Structure

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