How many total numbers in the 5 statements below have 2 significant figures?
· The mass was measured to be 0.02 gram
· The object massed at 2.25 lbs
· I measured a length of 40 cm
· There were 24 crayons in the box.
· I measured the height to be 1.0 m
1
2
3
4
5
How many total numbers in the 5 statements below have 3 significant figures?
· The mass was measured to be 0.00250 gram
· There are 220 lbs of flour
· There are 291 students present
· I measured a length of 40 cm
· The height of the box is 21.0 cm
1
2
3
4
5
What is the independent variable for the experiment?
Number of trials
Height of seedlings
Amount of water
Water type
What is the dependent variable for the experiment?
Amount of water
Height of seedlings
Water type
Number of trials
Select the correct set of properties for the following: salt water is boiling
Mixture, physical change
Substance, compound, physical change
Mixture, chemical change
Substance, compound, chemical change
Select the correct set of properties for the following: foam forms when vinegar and baking soda are mixed.
Substance, compound, chemical change
Substance, compound, physical change
Mixture, physical change
Mixture, chemical change
Ariel weighed an object on her balance and recorded a mass of 24.3 grams. Her teacher told her that there was obviously something wrong with her balance because it should have been 35.1 grams. What is her percent error?
30.8%
-30.8%
10.8%
44.4%
Ariel weighed an object on her balance and recorded a mass of 35.1 grams. Her teacher told her that there was obviously something wrong with her balance because it should have been 24.3 grams. What is her percent error?