Sampling Learning PSS HW
Label each of the following digits as significant or not significant. 0.03090
1) 0: Not significant 2) 0: Not significant 3)3: Significant 4) 0: Significant 5) 9: Significant 6) 0: Significant
Arrange these in values according to magnitude: 9.0 *10^-6 5.1*10^4 2.1*10^5 3.8*10^-2 7.1*10^-6
2.1*10^5 5.1*10^4 3.8*10^-2 9.0 *10^-6 7.1*10^-6
Read the volume of the liquid in this container, and report the answer with the proper number of digits.
37.7 mL (Again always measure one more decimal than given: PS Sapling Learning prefers .7 over all other numbers)
Add the following numbers. (8.385*10^-6) + (1.152 *10^-3)
= 0.001160385
Carry out the following multiplication. (1.58*10^4)(1.53*10^-6)
=0.024174
Carry out the following division. 4.28*10^3 /7.89*10^-8
=512158806*10^10
Use both rulers to measure the length of the pencil. Report the length from each ruler with the proper number of digits.
Ruler A: 1.7 dm Ruler B: 1.73 dm ( Always measure one more decimal than given by the ruler.)
Write the following numbers in scientific notation. a) 1117 b) 0.00045
a) 1.117 *10^3 b) 4.5*10^-4
Round each number to two significant figures. a) 233.356 b)0.002353 c)1.005
a) 23.00 (This one was wrong) b)0.0024 c)1.0
Write the following numbers in standard notation, maintaining the same number of significant figures. a) 6.104*10^2 b) 9.5*10^-3
a) 610.4 b)0.0095
To how many significant figures should each answer be rounded? a) (6.626*10^-34 J*s)(2.9979*10^8 m/s) / 4.070*10^-7 m = 4.880610663391*10^-19 J(unrounded) b) (6.022*10^23 atoms/mol)(0.589 g) / 20.18 g/mol = 1.758*10^22 atoms (unrounded)
a) after rounding: 4 significant figures. b)after rounding: 3 significant figures.
To what decimal place should each answer be rounded? How many significant figures does the rounded answer have? a) 9cm+2.8cm=11.8cm b) 0.135atm+0.6atm=0.735atm
a) rounded to the ones place and 2 significant figures. b) rounded to tenths place and 1 significant figure.
Identify the number of significant figures (sig figs) in each of these values. a) 80060 b) 6700 c)0.009 d)0.52000 e)3000 f)7.000 g)0.0090
a)80060: 4 sig figs b) 6700: 2 sig figs c)0.009: 1 sig fig d)0.5200: 5 sig figs e)3000: 1 sig fig f)7.0000: 4 sig figs g)0.0090: 2 sig figs
A student is measuring the mass of 20 paper clips using an electric balance that measures to the thousandths of a gram. The balance displays the following values for the mass of the paper clip: 20.120 g. Which of the following choices would be acceptable ways to record this mass on a lab report? Select all that apply. a) 20g b) 20.1 g c) 20.12 g d) 20.120g e) 20.1200g
d) 20.120g
Which of the following measurements contain three significant figures? a) 500 b) 5.0 *10^2 c) 0.001 d) 395 e) 0.00100 f) 1.00*10^-3
d) 395 e) 0.00100 f) 1.00*10^-3
