Chem Exam 1

Question 1

A Physical Property can be ____ and ____ without changing ____ or ____ of the substance.

A Chemical Property involves a _____ _____.

Answer 1

• Observed
• Measured
• Identity
• Chemical Structure
• Chemical Change

Question 2

Physical or Chemical

A) Color 
B) Flammability 
C) Hardness
E) Melting Point 
D) Toxicity 
F) Density

Answer 2

A) P
B) C
C) P
D) P
E) C
F) P

Question 3

Differences between Chem. & Phys. Changes?

Answer 3

Phys. Changes are usually Reversible

Chem. Changes are super difficult to reverse

Question 4

What is an Atom?

Answer 4

• Single Element

* Cannot be divided

Question 5

What is a Compound?

Answer 5

Two or more “Connected” Atoms

Question 6

What is Matter?

Answer 6

Matter has Mass, and takes up space

Question 7

Mixture or pure substance?

Can it be separated by a physical process?

Answer 7

Can it be separated by a physical process?

Yes: Mixture

No: Pure Substance

Question 8

Easy Definition for Heterogenous?

Answer 8

Shake or Stir? If so, then Yes- Heterogeneous

Question 9

Common Metric Prefixes:

Answer 9

Mega- 10^6
Kilo- 10^3 
Base Units 
Deci- 10^1 
Centi- 10^2 
Milli- 10^3 
Micro- 10^6 (weird u) 
Nano- 10^9

Question 10

Conversion Factors:
a) cm-m

B) kg-g

C) ms-s

D) Ms-s

E) L-uL

F) J-KJ

Answer 10

A) 1m/ 100cm

B) 1g/ 1000kg

C) 1s/ 1000ms

D) 1s/ 1x10^6 Ms

E) 1x10^6 uL/ 1L

F) 1000 KJ/ 1J

Question 11

Definition of Volume:

Answer 11

The amount of 3D Space occupied by a sample of Matter

Question 12

Density Formula:

Answer 12

D= Mass / Volume

Question 13

Volume Formula:

Answer 13

Volume = L•W•H

All must have the same unit before multiplying to find Volume.

Question 14

Definition of Density:

Answer 14

The amount of Matter that fits into a given Space

Question 15

The density of water at room temperature ( 1.0 g/mL )

Float or Sink?

Answer 15

• If an object has a density Less than 1.0 g/mL, then it Floats on water.
• If an object has a density Greater than 1.0 g/mL, then it Sinks in water.

Question 16

1.0 g/mL = ?

Answer 16

1.0 g/mL = 1.0 g/cm^3 = 1.0 g/cc

Question 17

Temperature Conversions:

Answer 17

T(F) = 1.8T(F) + 32

T(K) = T(C) + 273

Kelvin Temps are ALWAYS POSITIVE. No negative values because 0K is Absolute Value.

Question 18

The Three Temperature Scales:
List the degrees from water freezes to water boils, and the degree intervals for each scale.

1) Fahrenheit
2) Celsius
3) Kelvin

Answer 18

F Scale: 32F - 212F
~ 180 degree interval

C Scale: 0C - 100C
~ 100 degree interval

K Scale: 273K- 373K
~ 100 degree interval

Question 19

Digits Rule for Temp Conversion:

Answer 19

The number of decimal places on the initial unit determines the number of decimal places on final answer.

Only use this on the final answer.