WorksheetsIntro to Chemistry
Total questions: 15
Worksheet time: 8mins
Which of the following is something you should NOT do in a lab?
read the label of chemical bottles before using it
pour unused chemicals back into their original bottles
use lots of water to wash skin that has been splashed with chemicals
take only as much as you need of shared chemicals
An observation made with your senses
Qualitative observation
Quantitative observation
temperature
conclusion
What is an hypothesis?
a guess
a testable, tentative explanation
a theory
data
What is a manipulated variable (independent variable)?
the variable that changes as a result of the experiment
the variable that the scientist changes
the evidence
the quantitative observation
Based on the graph, what happens to the solubility of CO2 as the temperature increases?
it increases
it stays the same
it decreases
what is a graph?
What is an example of pure research?
creating synthetic elements to study their properities
producing heat-resistant plastics for use in household ovens
finding ways to slow down the rusting of iron ships
searching for fuel other than gasoline to power cars
What is a control?
a variable that is unchanged to compare results to
a changed variable
a hypothesis
a conclusion
Which of the following is an example of quantitative data?
grey
oily
44.2oC
Copper
Which is NOT an SI base unit?
second
kilogram
degree Celsius
meter
What is the correct representation of 702.2g in scientific notation?
7.02 x 103g
70.22 x 101 g
7.022 x 102 g
70.22 x 102 g
A piece of metal has a mass of 61.3g and a volume of 5.84cm3. What is the the metal? Hint: density!
copper (8.96 g/cm3)
molybdenum (10.2 g/cm3)
silver (10.5 g/cm3)
technetium (11.5 g/cm3)
Which of the following shows 229.613 correctly rounded to four significant figures and in scientific notation?
0.2296 x 10-3
2.29 x 103
2.296 x 10-2
2.296 x 102
How many significant figures (digits) are in the number 0.0034051?
4
5
7
3
A 5mL sample of water has a mass of 5g. What is the density of water?
1 g/mL
1 mL/g
25 gmL
10 gmL
What is chemistry?
the study of matter
the study of the universe
the study of science
the study of numbers
