CHM113 Chapter 1 HW

Which of the following is the correct description of the inside of a grapefruit A) It consists of a single compound in different states B) It consists of a homogeneous mixture of compounds C) It consists of a heterogeneous mixture of compounds D) It consists of a heterogeneous mixture of elements and compounds E) It is a pure compound

C - because many different compounds make up a grapefruit

A barrel of oil as measured on the oil market is equal to 1.333 U.S. barrels. A U.S. barrel is equal to 31.5 gal. If oil is on the market at $94.0 per barrel, what is the price in dollars per gallon? (a) $2.24/gal (b) $3.98/gal (c) $2.98/gal (d) $1.05/gal (e) $8.42/gal

a

Which of the following numbers in your personal life are exact numbers? (a) Your cell phone number (b) your weight (c) your IQ (d) your driver's license number (e) the distance you walked yesterday

a and d

Using Wolfram Alpha (http://www.wolframalpha.com/) or some other reference, determine which of these elements would be liquid at 525 K (assume samples are protected from air): (a) bismuth, Bi; (b) platinum, Pt; (c) selenium, Se; (d) calcium, Ca; (e) copper, Cu.

a. No b/c Bi melts at 544.45K b. No - 2041.5K c. No - 494.15K d. no - 1115.15K e. no - 1357.77K

Ellen recently purchased a new hybrid car and wants to check her gas mileage. At an odometer setting of 651.1 mi, she fills the tank. At 1314.4 mi, she requires 16.1 gal to refill the tank. Assuming that the tank is filled to the same level both times, how is the gas mileage best expressed? (a) 40 mi/gal (b) 41 mi/gal (c) 41.2 mi/gal (d) 41.20 mi/gal

d

Use decimal notation to express 4.22 mg in grams.

0.00422

How many picometers are there in 1 m?

10^12 pm

Platinum, Pt, is one of the rarest of the metals. Worldwide annual production is only about 130 tons. Platinum has a density of 21.4 g>cm3. If thieves were to steal platinum from a bank using a small truck with a maximum payload capacity of 900 lb, how many 1 L bars of the metal could they take? (a) 19 bars (b) 2 bars (c) 42 bars (d) 1 bar (e) 47 bars

19 1L bars

The density of the organic compound benzene is 0.879 g/mL. Calculate the mass in grams of 1.00 qt of benzene.

311.702g/qt

Use exponential notation to express 4.22 mg in grams.

4.22 x 10^(-3)

Express 6.0*103 m using a prefix to replace the power of ten.

6.0 km

How many significant figures are in each of the following measurements? (a) 3.549 g, (b) 2.3*104 cm, (c) 0.00134 m3.

a. 4 b. 2 c. 3

Fabiola, who lives in Mexico City, fills her car with gas, paying 357 pesos for 40.0 L. What is her fuel cost in dollars per gallon, if 1 peso =0.0759 dollars? (a) $1.18/gal (b) $3.03/gal (c) $1.47/gal (d) $9.68/gal (e) $2.56/gal

e

At a particular instant in time, the Earth is judged to be 92,955,000 miles from the Sun. What is the distance in kilometers to four significant figures? (See the back inside cover for the conversion factor). (a) 5763*104 km (b) 1.496*108 km (c) 1.49596*108 km (d) 1.483*104 km (e) 57,759,000 km

b