Question 1

The Mars Climate Orbiter was lost due to a failure in unit conversion. Which of the following best explains the error?

Accepted Answer

The contractor used English units while NASA expected metric units, leading to a miscalculation.

Question 2

Which of the following is the correct SI base unit for measuring mass?

Accepted Answer

Kilogram (kg)

Question 3

A cube of copper has a mass of 1.00 kg. Given the density of copper is $$8.96\ \mathrm{g/cm^3$}$$, what is the edge length of the cube in centimeters? (1 kg = 1000 g)

Accepted Answer

$$4.81\ \mathrm{cm}$$

Question 4

Which of the following numbers has three significant figures?

Accepted Answer

0.00823

Question 5

Which of the following is an example of an exact number?

Accepted Answer

There are 12 eggs in a dozen

Question 6

Convert 1 kilometer to miles using the following conversions: 1 mile = 5280 feet, 1 foot = 12 inches, 1 inch = 2.54 cm, 1 km = 100,000 cm.

Accepted Answer

0.6214 miles

Question 7

Which of the following statements about significant figures is correct?

Accepted Answer

Zeros between two significant figures are significant.

Question 8

A student measures the mass of a block four times and gets values very close to each other, but far from the true value. This means the measurements are:

Accepted Answer

Precise but not accurate

Question 9

Which of the following is the correct formula for density?

Accepted Answer

$$D = \dfrac{m}{V}$$

Question 10

A car gets 33 miles per gallon. If a hogshead is 300 L and 1 gallon = 3.785 L, how many hogsheads are needed to travel 3000 miles?

Accepted Answer

1.1 hogsheads

Question 11

Which of the following is the correct relationship between Celsius and Kelvin temperatures?

Accepted Answer

$$K = ^\circ C + 273.15$$

Question 12

Which prefix represents $$10^{-6} in $$the metric system?

Accepted Answer

Micro

Question 13

A measurement is recorded as 0.0540 g. How many significant figures does this value have?

Accepted Answer

3

Question 14

Which of the following is a derived SI unit?

Accepted Answer

Liter

Question 15

When multiplying $$2.0035 by$$ $$3.20$$, how many significant figures should the answer have?

Accepted Answer

3

Question 16

Which of the following best describes the difference between mass and weight?

Accepted Answer

Mass is the amount of matter in an object; weight is the gravitational pull on that matter.

Question 17

A scientist adds $$2.345$$, $$0.07$$, and $$2.9975. $$What is the correct answer with the proper number of decimal places?

Accepted Answer

$$5.41$$

Question 18

Which of the following is the correct formula for the kinetic energy of a moving object?

Accepted Answer

$$E = \dfrac{1}{2}mv^2$

Question 19

A sample of ethanol has a density of $$0.789\ \mathrm{g/cm^3$}. $$What is the mass of $$50.0\ \mathrm{mL} of $$ethanol?

Accepted Answer

$$39.5\ \mathrm{g}$$

Question 20

Which of the following best describes the concept of dimensional analysis?

Accepted Answer

Using units as a guide to solving problems and converting between quantities.

Units, Measurement, and Problem Solving in General Chemistry

Guida di studio - Domande di pratica

Study guide - Flashcard