Question

1) How many g/in^3 in 3.11 x 10^3 g/dm^3?

2) 1.00 in^3 (cubic inch) of a material has a mass of 0.240 lb. How many liters of this material would weigh 3.30 kg?

3) 1.00 in^3 of a metal weighs 0.544 pounds. What is the mass in kg of 7.80 L of this metal?

4) When you perform the following operations, how many significant figures should your answer have? (1.20000 x 10^4 g) + (2.41 x 10^2)

5) When you perform the following operations, how many significant figures should your answer have? (2.000 cm^3 x 15.6 g/cm^3) + 1.000 kg

6) Which of the following is a substance?

I. sodium hypochlorite

II. aqueous sodium hydroxide

III. Selenium

IV. Milk

Answer 1

1]

1 dm = 3.937 inch

3.11*10^3 g / dm^3 = 3.11*10^3 g / (3.937)^3 = 50.964 gm / inch^3

2]

1 inch3 ---> 0.24 lb

1 lb = 0.453592

0.24 lb = 0.10886 Kg

1 inch^3 = 0.10886 Kg

1 inch^3 = 0.0163871 L

0.0163871 L =  0.10886 Kg

3.3 Kg ----> 3.3* 0.0163871 / 0.10886 = 1.936 L

3]

1 inch3 = 0.544 pounds

1 inch^3 = 0.0163871 L

0.0163871 L = 0.544*0.453592 = 0.24675 Kg

7.8 L = 0.24675 *7.8 / 0.0163871 = 117.45 Kg

4]

01: 1.20000E+4+2.41E+2
02: 12241
03: 12241
Answer: 12241

Significant figures = 5

5]

01: 2.000*15.6+1.000
02: 31.2000+1.000
03: 31.2+1.000
04: 32.200
05: 32.2
Answer: 32.2

Significant figures = 3

6]

Answer is Selenium

Elements ---> Pure substance