Q: What is the correct metric equality for converting grams to milligrams?

$$1\ \text{g} = 1000\ \text{mg}$$

Q: What is the correct formula to convert Fahrenheit to Celsius?

$$^\circ\text{C} = (^\circ\text{F} - 32) \times \frac{1}{1.8}$$

Question 1

Which of the following best describes brass, an alloy of copper and zinc, according to the classification of matter?

Accepted Answer

A homogeneous mixture

Question 2

Which process describes the direct conversion of a solid to a gas, as shown in the phase change diagram?

Accepted Answer

Sublimation

Question 3

What is the correct metric equality for converting grams to milligrams?

Accepted Answer

$$1\ 	ext{g} = 1000\ 	ext{mg}$$

Question 4

How many significant figures are in the measurement 0.00450 g?

Accepted Answer

3

Question 5

A patient receives a prescription for 250 mg of a medication. How many grams is this?

Accepted Answer

$$0.25\ 	ext{g}$$

Question 6

Convert 0.00056 to scientific notation.

Accepted Answer

$$5.6 	imes 10$$^{-4}$$

Question 7

Which of the following elements is a diatomic molecule in its natural state?

Accepted Answer

Oxygen

Question 8

How many atoms of hydrogen are in one molecule of C$$_2H$_6O$$?

Accepted Answer

6

Question 9

Which of the following is a chemical change?

Accepted Answer

A nail rusting

Question 10

Balance the following equation: $$	ext{C}_2	ext{H}_6 + 	ext{O}_2 ightarrow 	ext{CO}_2 + 	ext{H}_2	ext{O}. $$What is the coefficient for $$	ext{O}_2 in $$the balanced equation?

Accepted Answer

3.5 (or 7 if all coefficients are doubled)

Question 11

Which subatomic particle determines the identity of an element?

Accepted Answer

Proton

Question 12

An isotope of carbon has a mass number of 14. How many neutrons does it have?

Accepted Answer

8

Question 13

Which type of radiation has the greatest penetrating ability?

Accepted Answer

Gamma ($$\gamma)$$

Question 14

A radioactive isotope has a half-life of 5 days. If you start with 80 mg, how much remains after 15 days?

Accepted Answer

10 mg

Question 15

Which radioisotope is commonly used for thyroid imaging?

Accepted Answer

Iodine-123

Question 16

Which of the following is a homogeneous mixture?

Accepted Answer

Sugar water

Question 17

What is the correct formula to convert Fahrenheit to Celsius?

Accepted Answer

$$^\circ	ext{C} = (^\circ	ext{F} - 32) 	imes \frac{1}{1.8}$$

Question 18

Which of the following is NOT a base SI unit?

Accepted Answer

Milliliter (mL)

Question 19

Which statement about isotopes is correct?

Accepted Answer

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

Question 20

Which of the following is a physical change?

Accepted Answer

Mixing oil, water, and eggs to make mayonnaise

Chemistry Basics: Matter, Measurement, and Atomic Structure – Study Guide

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