Chem exam 1 Flashcards


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Dr. Roberts Chem 111 Exam 1 hw usca Ch One
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1

What is the difference between an element and a compound?

An element is a pure substance which cannot be decomposed into simpler substances. A compound is composed of two or more elements in fixed proportions.

2

What is the difference between a pure substance and a mixture?

A pure substance is composed of only one type of atom or molecule; a mixture is a substance composed of two or more different types of atoms or molecules.

3

What is the difference between a homogeneous and a heterogeneous mixture?

A homogeneous mixture has the same composition throughout, while a heterogeneous mixture has different compositions in different regions

4

Pure Substance

Carbon Monoxide

Lead

5

Mixture

White Wine

Lobster Bisque

6

If it is a pure substance, classify it as an element or a compound.

Lead is an element; carbon monoxide is a compound.

7

If it is a mixture, classify it as homogeneous or heterogeneous.

White wine is homogeneous; lobster bisque is heterogeneous.

8

Define kinetic energy

energy associated with the motion of an object

9

Define potential energy.

energy associated with the position or composition of an object

10

The factor 0.01 corresponds to which prefix?

Centi`

11

The factor 101 corresponds to which prefix?

Deka

12

What symbol is used to represent the factor 102?

h

13

Convert 212 ∘F to ∘C (temperature of boiling at sea level)

100 ∘C

14

Convert 23 ∘C to K (approximate room temperature).

298 K

15

Convert 0.00 K to ∘F (coldest temperature possible, also known as absolute zero). Express your answer using five significant figures.

-459.67 ∘F

16

Convert 2.735 K to ∘C (average temperature of the universe as measured from background blackbody radiation).Express your answer using five significant figures.

-270.42 ∘C

17

39.0 ×10^5 g

3.90 megagrams

18

11.9 ×10^−10 s

1.19 nanoseconds

19

32.7 ×10^11 m

3.27 terameters

20

91.8× 10^−7 L

9.18 mircoliters

21

35 μL

3.5×10^−5 L

22

225 nm

2.25×10^−7 m

23

133 fg

1.33×10^−13 g

24

1.5 dg

1.5×10^−1 g

25

How many 1-cm cubes would it take to construct a cube that is 3 cm on edge?

27 cubes (3*3*3)

26

Calculate the density of the nugget

19.30 g/ml

m3

27

Could the nugget be made of gold?

The density of the nugget and the density of gold are essentially the same, thus the nugget could be made of gold could be returned

28

Human fat has a density of 0.918 g/cm3.

How much volume (in cm3) is gained by a person who gains 10.7 lb of pure fat?

5290 cm^3

29

A methane molecule contains 1 atom of carbon. The number 1 represents how many significant figures?

infinite

30

How many significant figures are there in the answer for the following problem?

[(143.7−121) × 2.06]0.600 = ?

two

31

560,405 mi express your answer as an integer. How many sig figs?

6

32

0.01050 m: how many sig figs

4

33

0.040058 km: how many sig figs

5

34

8,003 m: how many sig figs

4