CHM 111 Supplemental Instruction 1-17-23

Conversions

100

Convert 5000 grams (g) to kilograms (kg).

5 kg

200

Convert 1.25 grams (g) to milligrams (mg).

1250 mg

300

Convert 544 milliliters (mL) to liters (L).

0.544 L

400

A person weighs 85 kilograms (kg).  Express this weight in pounds (lb).

Note: 1 lb = 453.6 g

187.39 lb

500

Convert 1.2 g/mL to g/cm³.

1.2 g/cm³

Accuracy, Precision, and Calculations with Sig Figs

100

If I hit the center of a target multiple times in a row, am I accurate, precise, or both?

Both Accurate and Precise

200

If I hit the left side of a target multiple times at the same location, am I accurate and/or precise?

Precise, but not Accurate

300

What is the correct number of significant figures resulting from this calculation?

21.3 g x 2.7 g

2 sig figs

400

How many decimal places will the answer from this calculation have?

51.2 m + 5.72 m

1 decimal place

500

What is the correct answer (with significant figures) for the following calculation?

5.78 mL x 4.356 mL

25.2 mL

Sig Figs

100

How many sig figs are in the following number?  

456 grams

3 sig figs

200

How many sig figs are in the following number?

15,300 grams

3 sig figs

300

How many sig figs are in the following number?

9305 meters

4 sig figs

400

How many sig figs are in the following number?

45.360 grams

5 sig figs

500

How many sig figs are in the following number?

0.0032 cm

2 sig figs

Density

100

What is the formula for density?

d = m/v

200

What is the most common unit for the density of a solid?

g/cm³

300

What is the most common unit for the density of a liquid?

g/L or g/mL

400

A piece of metal with a mass of 672 g has a volume of 54.0 cm³.  Calculate the density of the metal in g/cm³.

Apply d=m/v.

12.4 g/cm³

500

A fluid has a volume of 152 mL and a density of 15 g/mL.  What is the mass of the liquid in grams?

Apply m=vd.  

2280 grams

Periodic Table

100

What is the name of a positive ion?

Example: Na⁺

Cation

200

True or False: Elements have similar properties based on their Group in the Periodic Table.

True

300

What is the atomic number of potassium (K)?

The atomic number is the number of protons.  Potassium (K) has an atomic number of 19.

400

Is ⁴²Ca an isotype?

Yes, it has two extra neutrons.

500

Find the number of protons, neutrons, and electrons in the following isotope:

¹⁸O^2-

Protons: 8

Neutrons: 10

Electrons: 10