Q: Convert $$5.0\ \mathrm{m}^3 to$$ $$\mathrm{cm}^3.$$

$$5.0 \times 10^6$\ \mathrm{cm}^3$$

Q: Which of the following is the correct calculation for the specific heat $$c if$$ $$q = 49.5\ \mathrm{J}$$, $$m = 7.3\ \mathrm{g}$$, and $$\Delta T = 15\ ^\circ\mathrm{C}$$?

$$c = \dfrac{49.5}{7.3 \times 15}$$

Question 1

Which of the following best describes the difference between a physical and a chemical change?

Accepted Answer

A chemical change results in the formation of new substances, while a physical change does not alter the substance's composition.

Question 2

A student burns a piece of wood in an open dish and notices the mass decreases. Which principle explains why the total mass is actually conserved?

Accepted Answer

The Law of Conservation of Mass, because the lost mass is due to gases escaping into the air.

Question 3

Convert $$5.0\ \mathrm{m}^3 to$$ $$\mathrm{cm}^3.$$

Accepted Answer

$$5.0 	imes 10^6$\ \mathrm{cm}^3$$

Question 4

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes of an element have the same number of protons but different numbers of neutrons.

Question 5

A sample of a radioactive isotope has a half-life of 23 days. How many half-lives must pass for a 6.0 g sample to decay to less than 0.03 g?

Accepted Answer

9

Question 6

Which of the following is a homogeneous mixture?

Accepted Answer

Stainless steel

Question 7

Calculate the density of a metal if its mass is $$14.01\ \mathrm{g}$$ and it displaces water from $$25.2\ \mathrm{mL} to$$ $$33.6\ \mathrm{mL}.$$

Accepted Answer

$$1.67\ \mathrm{g/mL}$$

Question 8

Which of the following best describes the result of Rutherford’s gold foil experiment?

Accepted Answer

Most alpha particles passed through, indicating atoms are mostly empty space with a small dense nucleus.

Question 9

Which of the following is the correct symbol for an element with 15 protons and 16 neutrons?

Accepted Answer

$$^{31}_{15}\mathrm{P}$$

Question 10

A solution is prepared by dissolving salt in water. Which of the following best describes this mixture?

Accepted Answer

A homogeneous mixture

Question 11

Which of the following is the correct calculation for the specific heat $$c if$$ $$q = 49.5\ \mathrm{J}$$, $$m = 7.3\ \mathrm{g}$$, and $$\Delta T = 15\ ^\circ\mathrm{C}$$?

Accepted Answer

$$c = \dfrac{49.5}{7.3 	imes 15}$$

Question 12

Which of the following statements about ions is correct?

Accepted Answer

A cation is formed when an atom loses electrons.

Question 13

Which of the following is a correct application of significant figure rules for the calculation $$2.02 + 8.102 - 0.0297$$?

Accepted Answer

The answer should be rounded to two decimal places, giving $$10.09.$$

Question 14

Which of the following best describes the process of beta decay?

Accepted Answer

A neutron is converted into a proton and an electron, and the atomic number increases by 1.

Question 15

Which of the following is the correct scientific notation for $$0.000000000172$$?

Accepted Answer

$$1.72 	imes 10$$^{-10}$$

Question 16

Which of the following best explains why U-235 can sustain a chain reaction?

Accepted Answer

Because neutrons released by fission can initiate further fissions in nearby U-235 nuclei.

Question 17

Which of the following is a correct statement about the periodic table?

Accepted Answer

Metals are generally found on the left side of the periodic table.

Question 18

A sample contains two isotopes of chlorine: $$^{35}\mathrm{Cl} ($$mass = $$34.9689 u) $$and $$^{37}\mathrm{Cl} ($$mass = $$36.9695 u). If $$the atomic mass of chlorine is $$35.45 u$$, what is the approximate natural abundance of $$^{35}\mathrm{Cl}$$?

Accepted Answer

$$75.95\%$$

Question 19

Which of the following is NOT a base SI unit?

Accepted Answer

Liter

Question 20

Which of the following is an example of an endothermic process?

Accepted Answer

Melting of ice

Introduction to Chemistry: Exam 1 Study Guide (Chapters 1, 2, 3, 4, 17)

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