$$1 \text{ in.} = 2.54 \text{ cm}$$

$$\text{Specific heat} = \dfrac{\text{heat}}{\text{grams} \times \Delta T}$$

Question 1

Which of the following best describes a chemical change?

Accepted Answer

Iron rusting when exposed to air

Question 2

A sample contains 25% of its original carbon-14. The half-life of carbon-14 is 5730 years. Approximately how old is the sample?

Accepted Answer

$$11460 	ext{ years}$$

Question 3

Which of the following is a correct example of a homogeneous mixture?

Accepted Answer

Salt dissolved in water

Question 4

What is the correct symbol for the element calcium?

Accepted Answer

Ca

Question 5

Which of the following statements about isotopes is TRUE?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons

Question 6

A student measures the mass of a liquid as $$12.50 	ext{ g}$$ and its volume as $$8.0 	ext{ mL}. $$What is the density of the liquid?

Accepted Answer

$$1.6 	ext{ g/mL}$$

Question 7

Which of the following is the correct scientific notation for the number 0.000012?

Accepted Answer

$$1.2 	imes 10$$^{-5}$$

Question 8

Which of the following is NOT a SI base unit?

Accepted Answer

Gram

Question 9

Which of the following is the correct conversion factor to convert $$1 	ext{ inch} to $$centimeters?

Accepted Answer

$$1 	ext{ in.} = 2.54 	ext{ cm}$$

Question 10

Which of the following best describes the law of conservation of energy?

Accepted Answer

Energy can change forms but cannot be created or destroyed

Question 11

A food item contains 220 Calories. How many joules does this represent? ($$1 	ext{ Calorie} = 4184 	ext{ J})$$

Accepted Answer

$$919,000 	ext{ J}$$

Question 12

Which of the following particles has no charge and is found in the nucleus?

Accepted Answer

Neutron

Question 13

Which type of nuclear radiation is most penetrating and can affect cells deep within the body?

Accepted Answer

Gamma rays

Question 14

What is the correct formula for calculating specific heat?

Accepted Answer

$$	ext{Specific heat} = \dfrac{	ext{heat}}{	ext{grams} 	imes \Delta T}$$

Question 15

Which of the following ions is named correctly?

Accepted Answer

Fe$$^{2+}$$: iron(II) ion

Question 16

Which of the following elements is a noble gas?

Accepted Answer

Neon

Question 17

Which of the following is a polyatomic ion?

Accepted Answer

OH$$^-$$

Question 18

Which of the following best describes the octet rule?

Accepted Answer

Atoms react to achieve eight electrons in their valence shell

Question 19

Which of the following is the correct formula for the number of electrons in an energy level $$n$$?

Accepted Answer

$$2n^2$$

Question 20

Which of the following is the correct name for the ion NH$$_4^+$$?

Accepted Answer

Ammonium ion

GOB Chemistry Study Notes: Matter, Measurement, Radioactivity, and How Elements Combine

Study Guide - Practice Questions