$$6.02 \times 10$$^{23}$$ = 602$$,000,000,000,000,000,000,000$$

Question 1

Which of the following correctly applies the rules for significant figures when adding $$12.34$$, $$0.56$$, and $$7.1$$?

Accepted Answer

$$12.34 + 0.56 + 7.1 = 20.0$$

Question 2

Convert $$3.25 	imes 10^4$ to standard notation.

Accepted Answer

$$32,500$$

Question 3

Which of the following is a physical change?

Accepted Answer

Boiling water to produce steam

Question 4

A patient’s temperature is $$39.0\ ^\circ C. $$What is this temperature in Fahrenheit? Use $$F = \frac{9}{5}C + 32.$$

Accepted Answer

$$102.2\ ^\circ F$$

Question 5

Which of the following is a homogeneous mixture?

Accepted Answer

Salt dissolved in water

Question 6

Which of the following is a compound?

Accepted Answer

Carbon dioxide ($$CO_2)$$

Question 7

Which of the following is an example of a chemical property?

Accepted Answer

Iron reacts with oxygen to form rust

Question 8

Convert $$250\ ^\circ F to $$Celsius using $$C = \frac{5}{9}(F - 32).$$

Accepted Answer

$$121.1\ ^\circ C$$

Question 9

Which of the following best describes a heterogeneous mixture?

Accepted Answer

A mixture where the components are not uniformly distributed

Question 10

Which of the following is the correct scientific notation for $$0.00045$$?

Accepted Answer

$$4.5 	imes 10$$^{-4}$$

Question 11

A sample of juice contains $$0.25 L. $$How many mL is this? ($$1 L$$ $$= 1000 mL)$$

Accepted Answer

$$250$$\ mL

Question 12

Which of the following is an example of a chemical change?

Accepted Answer

Milk turning sour

Question 13

Which of the following best describes an element?

Accepted Answer

A substance that cannot be broken down into simpler substances by chemical means

Question 14

A reaction releases $$150 kJ of $$energy. How many calories is this? ($$1$$ cal $$= 4.184 J)$$

Accepted Answer

$$35,860$$ cal

Question 15

Which of the following is a correct conversion from scientific to standard notation?

Accepted Answer

$$6.02 	imes 10$$^{23}$$ = 602$$,000,000,000,000,000,000,000$$

Question 16

Which of the following is a pure substance?

Accepted Answer

Distilled water

Question 17

A student needs to prepare $$500 mL of a$$ $$0.2 M $$NaCl solution. How many moles of NaCl are required?

Accepted Answer

$$0.1$$ mol

Question 18

Which of the following is an intensive property?

Accepted Answer

Density

Question 19

Which of the following best describes a mixture?

Accepted Answer

A combination of two or more substances that retain their individual properties

Question 20

A chemical reaction requires $$250$$ cal of energy. How many joules is this? ($$1$$ cal $$= 4.184 J)$$

Accepted Answer

$$1046 J$$

Exam 1 Study Guide: Introduction to Chemistry (CHM 130, Chapters 1–3)

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