Chem 170 chapter 1

Question 1

A chemist mixes sodium with water and witnesses a violent reaction between the metal and water, this is classified as…

a) observation
b) a law
c) a hypothesis
d) a theory

Answer 1

a) Observation

Question 2

2 different elements attached to each other are called

Answer 2

A compound

Question 3

A single element is called

Answer 3

a pure element

Question 4

Gasoline evaporating is an example of

Answer 4

physical change

Question 5

wood burning is an example of

Answer 5

chemical change

Question 6

convert 85 degrees F to Kelvin

Answer 6

302.6 K
f-32/1.8 = C
C + 273.5 = K

Question 7

33.2x10^-4 m to mm

Answer 7

33.2mm

Question 8

Match the values
mega (M) = ?
Kilo (K) = ?
deka (da) = ?
deci (d) = ?
centi (c) = ?
milli (m) = ?
micro (u) = ?
nana (n) = ?
pico (p) = ?

Answer 8

mega (M) = 10^6
Kilo (K) = 10^3
deka (da) = 10^1
deci (d) = 10^-1
centi (c) = 10^-2
milli (m) = 10^-3
micro (u) = 10^-6
nana (n) = 10^-9
pico (p) = 10^-12

Question 9

What is the mass of 1.75 L sample of liquid that has a density of 0.921 g/ml

Answer 9

1.61 x10^3g

Mass = Density * Volume

Question 10

sigfig rules

Answer 10

Rule 1: Non-zero digits are always significant.
Rule 2: Any zeros between two significant digits are significant.
Rule 3: A final zero or trailing zeros in the decimal portion ONLY are significant.

Question 11

Exact numbers are

Answer 11

Whole numbers without decimals

Question 12

1285 cm^2 to m^2

Answer 12

.1285m^2

Question 13

1m = ? cm
1m^2 = ? cm^2
1m^3 = ? cm^3

Answer 13

1m = 100 cm
1m^2 = 10000 cm^2
1m^3 = 1000000 cm^3

Question 14

Formulas for Mass, Density, and Volume
Mass = ?
Density = ?
Volume = ?

Answer 14

Mass = Density * Volume
Density = Mass / Volume
Volume = Mass / Density