Biochem Learning Check Questions

Identify the place value for each of the digits in the following number: 15.24 g

1- tens 5- ones 2- tenths 4-hundreths

write 12 800 000 m in scientific notation

1.28 × 107 m

An unknown liquid has a density of 1.32 g/mL. What is the volume (mL) of a 14.7-g sample of the liquid?

11.1 mL of liquid

John took 2.0 teaspoons (tsp) of cough syrup for a cough. If the syrup had a density of 1.20 g/mL and there is 5.0 mL in 1 tsp, what was the mass, in grams, of the cough syrup?

12 g of syrup

How many minutes are in 1.6 days?

2304 minutes

A rattlesnake is 2.44 m long. How many centimeters long is the snake?

244 cm

An aspirin tablet contains 325 mg of aspirin (active ingredient), and the tablet has a mass of 545 mg. What is the percentage of aspirin in the tablet?

59.6% asprin

1 L = 10 dL 1 L = 1000 mL 1 dL = 100 mL

= 1 × 101 dL = 1 × 103 mL = 1 × 102 mL

1 m = 100 cm 1 m = 1000 mm 1 cm = 10 mm

= 1 × 10^2 cm = 1 × 10^3 mm = 1 × 10^1 mm

1 kg = 1000 g 1 g = 1000 mg 1 g = 100 cg 1 mg = 1000 μg (mcg)

= 1 × 10^3 g = 1 × 10^3 mg = 1 × 10^2 cg = 1 × 10^3 μg (mcg)

Write the equality and two conversion factors for each of the following: A. meters and decimeters B. jewelry that contains 18% gold C. One gallon of gas is $2.40.

A - 1m/10dm and 10dm/1m B- 18g gold/100g jewelry and 100g jewelry/18g gold C- $2.40/1 gal and 1 gal/$2.40

Write each of the following in correct scientific notation: A. 64 000 B. 0.021

A - 6.4 × 10^4 B - 2.1 × 10^−2

Write the correct value when 3.145 g is rounded off to each of the following: Two figure after the decimal point One figure after the decimal point

A. The answer is 3.15 g. B. The answer is 3.1 g.

A. 1 kg = _____ (1) 10 g (2) 100 g (3) 1000 g B. 1 cL = _____ (1) 0.001 L (2) 0.01 L (3) 100 L

A. 1 kg = _____ (3) 1000 g B. 1 cL = _____ (2) 0.01 L

Indicate the unit that completes each of the following equalities: A. 1000 m = _____ (1) 1 mm (2) 1 km (3) 1 dm B. 0.01 m = _____ (1) 1 cm (2) 1 mm (3) 1 dm

A. 1000 m = _____ (2) 1 km B. 0.01 m = _____ (1) 1 cm

Write the equality and two conversion factors for each of the following pairs of units: A. liters and milliliters B. inches and meters C. milligrams and micrograms

A. 1000mL / 1L and 1L / 1000mL B. 39.4in / 1 m and 1m/39.4in C. 1mg/1000mcg and 1000mcg/1mg

Adjust the following calculated answers to give answers with one figure after the decimal point: A. 824.75 cm B. 0.112 486 g C. 5.3 L

A. 824.75 cm 824.8 cm B. 0.112 486 g 0.1 g C. 5.3 L 5.3 L

For each of the following, indicate whether the unit describes (1) length, (2) mass, or (3) volume. A. A bag of onions has a mass of 2.6 kg. B. A person is 1.7 m tall. C. A medication contains 0.50 g of aspirin. D. A bottle contains 1.5 L of water.

A. A bag of onions has a mass of 2.6 kg. (2) B. A person is 1.7 m tall. (1) C. A medication contains 0.50 g of aspirin. (2) D. A bottle contains 1.5 L of water. (3)

Identify the measurement given in an SI unit. A. John's height is _____. (1) 1.5 yd (2) 6 ft (3) 1.9 m B. The mass of a lemon is _____. (1) 12 oz (2) 0.145 kg (3) 0.31 lb C. The temperature is _____. (1) 255 K (2) 85 °C (3) 45 °F

A. John's height is______. (3) 1.9 m B. The mass of a lemon is _____. (2) 0.145 kg C. The temperature is _____. (1) 255 K

Which of the following contains chemicals? A. sunlight B. fruit C. milk D. breakfast cereal

B,C,D

Fill in the blanks with the correct prefix. A. 1000 m = 1 ___m B. 1 × 10−2 g = 1 ___g C. 0.1 L = 1 ___L

Fill in the blanks with the correct prefix. A. 1000 m = 1 ___m The prefix for 1000 is kilo; 1000 m = 1 km. B. 1 × 10−2 g = 1 ___g The prefix for 1 × 10−2 is centi; 1 × 10−2 g = 1 cg (cg). C. 0.1 L = 1 ___L The prefix for 0.1 is deci; 0.1 L = 1 dL.

Identify the larger unit in each of the following: A. mm or cm B. kilogram or centigram C. dL or μL D. mcg or mg

Identify the larger unit in each of the following: A. mm or cm!!! B. kilogram!!! or centigram C. dL!!! or μL D. mcg or mg!!!

Solve the following equation for P1: P1V1=P2V2

P1= (P2V2)/(V1)

What is the length of the red line? (1) 9.2 cm (2) 9.4 cm (3) 9.20 cm . |8. . . . | . . . . |9. * . . | . . . . |10. . cm

What is the length of the red line? (1) 9.2 cm (2) 9.4 cm (3) 9.20 cm (we can estimate the last digit 0)