Theory
Is the following expression written in scientific notation? If not, explain why: 3.25+10-7
No, 3.25 should be multiplied by 10-7
Solve the expression (3.7 x 109) + (9.04 x 109)
1.274 x 1010
Solve the expression (7 x 105) - (5.2 x 104)
6.48 x 105
How many sig figs in 0.502?
3sf
0.003km → cm
0.003 × 1000=3 m
3 × 100=300 cm | or 3.0 × 10² cm
Keep the last significant figure digit the same and do not round up if the number after is..
What is less than five?
Solve (4.53 x 105) + (2.2 x 106)
What is 2.6 x 106?
Solve (2 x 104) - (4 x 102)
1.96 x 104
(3.0×102)(2.0×103)
3.0 × 2.0=6.0
102 × 103=105
6.0 × 105
300K→∘C
(use K - 273 = C)
27 ∘C
The size of the Sahara desert is about 3.629 x 106 square miles and the Arabian desert is about 9 x 105 square miles. Which desert is larger? Explain how you know.
What is Sahara, because it has a larger exponent?
Solve (5.4 x 103)+(1.2 x 105)
1.254 x 105
(2.130 x 103) - (6.6 x 102)
What is 1.5 x 103?
Round 77.0653 to three significant figures.
What is 77.1?
60miles/hour → m/s
(Use: 1 mile = 1609 m, 1 hr = 3600 s)
60 × 1609 / 3600 ≈26.8m/s
Round the last significant figure digit up if the number after is...
What is greater than five?
The population of the United States is 3.1 x 108 and the population of Canada is 3.38 x 107 . What is the total population?
3.438 x 108
Solve (2.005 x 105) - (8.664 x 103) and round to 2 significant figures.
2.0 x 105
2.0×102 / 6.0×105
6.0 ÷ 2.0 = 3.0
105-2=103
A sample has a density = 7.8 g/cm³ and a volume of 15 cm³.
Write the dimensional analysis set up only!
15cm3 ×1 cm / 37.8 g
How many sig figs in the following expression?
0.982 x 10^-3
What is 3?
Solve (3.2 x 10-2) + (3.2 x 10-4)+ (2.8 x 10-2)
6.032 x 10-2
(5.2 x 104) - (1.5 x 102) - (4.6 x 104)
5.85 x 103
Convert to standard number 736.9 x 105
What is 73690000?
68∘F→K
(hint: convert to C first)
293.15