Scientific Method
What variable in an experiment do we change?
independent variable
Convert 80 g to kg.
.08 kg
Put 560000 into scientific notation.
5.6 x 105
What is the SI base unit for temperature?
K (Kelvin)
Convert 11.0 cm to m.
0.110 m
What is the variable we measure in an experiment?
dependent
Convert 5600 L to mL.
5600000 mL
How many sig figs does 56.010 have?
5
What is the SI base unit for length?
meter (m)
What is the average of 40, 67, 81, and 42?
57.5
Jill is trying to see how plants in the same pots grow with differing amounts of sunlight. What is the independent and dependent variable? Constants?
amounts of sunlight is ind, height of plants is dep., constant is the pot
Jill has a giraffe that is 12 km tall. How tall is her giraffe in cm?
1200000 cm
Compute this answer with the correct number of sig figs. 50.00 - 25.000 = ?
50.00 - 25.000 = 25.00
What measurement shows the greatest precision? 14 m, 14.0 m, 14.00 m
14.00 m
Convert 5600 to scientific notation.
5.6 x 103
Explain why we need constants in experiments.
How many L are in 100 cL?
1 L
Put 2.3 x 10-2 into standard notation.
.023
If a student measure the mass as 11.0 g and the volume as 12.0 mL, what is the density?
0.920 g/mL
What is the percentage error if Jill got 54.1 g, but the actual value was 56.2 g?
3.7%
What is a hypothesis?
This is an educated guess.
What is a conversion factor?
a ratio of equivalent values that equals 1
How many sig figs are in 560060?
5
Jenna was in the lab and recorded the volume of her block as 40.0 cm3. The actual volume of the block was 43.0 cm3. What is Jenna’s percent error?
6.98%
A graduated cylinder reads 41.0 mL. After a rock is added, it reads 75.5 mL. If the rock’s mass is 32.0 g, find its density.
0.928 g/mL