28 Sep Which of the following is a proper measurement?

CHEM1305 Introductory Chemistry

Chapter 2 Homework Assignment  

Question 1Which of the following is a proper measurement?

  12

 

  yard stick

 

  50 meters

 

  dozen

 

 Question 2Give the number of significant figures in each:

 

a) 6000 mL

 

1

 

 b) 0.02508 cm

 

4

 

 c) 94.2 g

 

3

 

d) 1,001 in

 

Question 3What is the number 0.000583 in scientific notation format?

 

  5.83 × 10-4

 

  5.83 × 104

 

  5.83 × 10-3

 

  5.83

 

 Question 4What is the number 7.9 × 108 written as an ordinary number?

 

  790,000

 

  0.000000079

 

  790,000,000

 

  7,900,000,000

 

 Question 5Complete the calculation and choose the answer using the correct number of significant figures:

 

5.007 m × 6 m

 

  30.042 m2

 

  30.04 m2

 

  30 m2

 

  30 m

 

 Question 6Complete the calculation and choose the answer using the correct number of significant figures:

 

17.75 g + 21 g

 

  39 g

 

  38.8 g

 

  38.75 g

 

  38.75 g2

 

 Question 7Choose the correct abbreviation for the unit “milliliter” and define in terms of the base unit.

 

  mil; 100 mil = 1 l

 

  ML; 1 ML = 1,000,000 L

 

  mL; 1000 mL = 1 L

 

  μL; 1,000,000 μL = 1 L

 

 Question 8Convert 651,000 m to km, given 1000 m = 1 km

 

  65.1 km

 

  6.51 km

 

  651,000,000 km

 

  651 km

 

 Question 9Convert 135 lb to kg, given 1 lb = 454 g; 1000 g = 1 kg

 

  3.36 kg

 

  61.3 kg

 

  0.000297 kg

 

  297 kg

 

 Question 10What is the density of oxygen, given that a 2.00 L sample of oxygen has a mass of 2.86 g?

 

  5.72 g/L

 

  1.43 g/mL

 

  0.699 g/L

 

  1.43 g/L