Intro to chemistry

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

Tags

NGSS.4-LS1-2

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

Which of the following is an example of quantitative data?

• grey

• oily

• 44.2^oC

• Copper

Tags

NGSS.MS-PS3-1

NGSS.MS-PS3-4

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)

Tags

NGSS.MS-PS1-2

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