Chemistry Final exam questions latest update
2025 with verified actual answers (West Coast
University)
64,000 g = 6.4 x 10⁴ g
0.021 m = 2.1 x 10⁻² m
138 mL = 1.38 x 10² mL - answer ✔✔-Scientific Notation
To write 2400 m in correct S.N. has three parts:
1) Coefficient is 2.4
2) Power of 10 is 3
3) Unit is "m"
2400 m = 2.4 x 1000 = 2.4 x 10³ m - answer ✔✔-Scientific Notation 2400 m
Are all the digits including the estimated digits.
a. Not a zero - 4.5g = 2 SF
b. A zero between digits - 205 m = 3SF
c. A zero at the end of a decimal number - 50.0 L = 2 SF
d. in the coefficient of a written number written in scientific notation\
4.8 x 10⁵ m = 2 SF - answer ✔✔-Significant Figures
a. At the beginning of a decimal number
Ex: 0.0004 s = 1 SF
b. Used as a placeholder in a large number without a decimal point
, Ex: 850 000 m = 2 SF - answer ✔✔-Not Significant if...
In multiplication or division, the final answer is written so it has the same number of SF as the
measurement with the FEWEST SF
Ex: 24.66 cm x 0.35 cm = 8.631 (calculator) = 8.6 cm²
2 SF
Multiplying 4 SFs by 2 SFs gives us an answer with 2 SFs
*** You may have to add significant zeros 4.00 - answer ✔✔-SF Rules for Multiplication and Division
The final answer is written so it has the same number of decimal places as the measurement with the
FEWEST DECIMAL PLACES
Ex: Add the following numbers
2.012 g = three decimal places
+61.09 g = two decimal places
+3.0 g = one decimal places
= 66.102 g (calculator display)
=66.1 g answer rounded to one decimal place - answer ✔✔-SF Rules for Addition & Subtraction
Prefixes that increase the size of a unit
T - Tera - 1 x 10¹² - "Tough"
G - Giga - 1 x 10⁹ - "Grandma"
M - Mega - 1 x 10⁶ = 1 000 000 - "Makes"
K - Kilo - 1 x 10³ = 1 000 - "Krack"
The exponents jump by 3s
2025 with verified actual answers (West Coast
University)
64,000 g = 6.4 x 10⁴ g
0.021 m = 2.1 x 10⁻² m
138 mL = 1.38 x 10² mL - answer ✔✔-Scientific Notation
To write 2400 m in correct S.N. has three parts:
1) Coefficient is 2.4
2) Power of 10 is 3
3) Unit is "m"
2400 m = 2.4 x 1000 = 2.4 x 10³ m - answer ✔✔-Scientific Notation 2400 m
Are all the digits including the estimated digits.
a. Not a zero - 4.5g = 2 SF
b. A zero between digits - 205 m = 3SF
c. A zero at the end of a decimal number - 50.0 L = 2 SF
d. in the coefficient of a written number written in scientific notation\
4.8 x 10⁵ m = 2 SF - answer ✔✔-Significant Figures
a. At the beginning of a decimal number
Ex: 0.0004 s = 1 SF
b. Used as a placeholder in a large number without a decimal point
, Ex: 850 000 m = 2 SF - answer ✔✔-Not Significant if...
In multiplication or division, the final answer is written so it has the same number of SF as the
measurement with the FEWEST SF
Ex: 24.66 cm x 0.35 cm = 8.631 (calculator) = 8.6 cm²
2 SF
Multiplying 4 SFs by 2 SFs gives us an answer with 2 SFs
*** You may have to add significant zeros 4.00 - answer ✔✔-SF Rules for Multiplication and Division
The final answer is written so it has the same number of decimal places as the measurement with the
FEWEST DECIMAL PLACES
Ex: Add the following numbers
2.012 g = three decimal places
+61.09 g = two decimal places
+3.0 g = one decimal places
= 66.102 g (calculator display)
=66.1 g answer rounded to one decimal place - answer ✔✔-SF Rules for Addition & Subtraction
Prefixes that increase the size of a unit
T - Tera - 1 x 10¹² - "Tough"
G - Giga - 1 x 10⁹ - "Grandma"
M - Mega - 1 x 10⁶ = 1 000 000 - "Makes"
K - Kilo - 1 x 10³ = 1 000 - "Krack"
The exponents jump by 3s
