Measuring Matter (sig. figs., density, precision, etc.)

You will have to DRAW particle diagrams in order to answer Questions 2, 4, and 5 in this Test Review (using Notability). Your particle diagrams MUST be approved by Dr. Moore before you submit your answer to Quizziz.

Do you understand?

• YES!

• NO!

Consider particle diagrams for a 10.0 gram cubes of Metal A (red particles).

Metal A has a density of 2.0 g/mL and Metal B has a density of 6.0g/mL. If you had the same MASS of both metals (10.0 grams each), then how would the particle diagram for Metal B differ from Metal A? Sketch the particle diagram for Metal B in Notability to represent the VOLUME or size of the Metal B sample relative to Metal A.

• The boxes for both metals would be the same size, but the box for metal B would have more particles in it.

• The box for metal B would be 3 times larger than the box for metal A, but the particle count would be the same in each box.

• The box for metal A would be 3 times larger than the box for metal B, but the particle count would be the same in each box.

• The box for metal A would be the same size as the box for metal B, but there would be a third (or 1/3) as many particles in box A.

Consider the plot of Metal A (Blue) and Metal B (Red). Determine the density of Metal B (Red) from the plot to the correct sig. figs.

• 1.45 g/mL

• 8.46 g/mL

• 2.43 g/mL

• 7.64 g/mL

In Notability, illustrate equal VOLUME (same size) cubes of Metal A (blue) and Metal B (red) from Question 4 (by drawing circular particles in the same SIZE boxes). If the box for Metal A (2.43 g/mL) has 4 (evenly distributed) particles in it, then ...

...how many (evenly distributed) particles should be drawn in the box for Metal B (8.46 g/mL)? (Sketch both Metal A and Metal B in Notability.)

• 3

• 4

• 7

• 14

Consider the incomplete particle diagram for dissolving salt in water, then use Notability to complete the particle diagram. Does Dr. Moore approve your particle diagram?

• OH yea! - She said it was an A/A+ submission.

• Nope! - She said it needs a little work; B/B- submission.

• Nope! - She said I must have forgotten how to draw particle diagrams and I need to come in ASAP for extra instruction.

State the number of significant figures in the measurement: 0.0050.

• 1

• 2

• 3

• 4

What is the answer to the following expression to the correct number of significant figures: (12.125 + 0.530 + 71.4)?

• 84.055

• 84.1

• 84

• 84.06

Which of the following numbers is matched with the CORRECT number of significant figures for the number? (Check all that are correct.)

• 1.04; 2 significant figures

• 0.04300; 5 significant figures

• 156,000; 3 significant figures

• 3.0650; 4 significant figures

How many centigrams are 1 kilogram?

• 1 x 10² cg

• 1 x 10³ cg

• 1 x 10⁵ cg

• 1 x 10^-5 cg

How many significant figures does the difference 218.7201 - 218.63 contain?

• 1

• 3

• 5

• 7