Question 1

Which of the following best describes why chemistry is considered the 'central science'?

Accepted Answer

Because it connects and overlaps with fields such as biology, physics, medicine, engineering, and environmental science.

Question 2

Which of the following is an example of a homogeneous mixture?

Accepted Answer

Air

Question 3

A sample of water is heated from 25 $$^\circC to 100$$ $$^\circC. $$Which type of change is this?

Accepted Answer

Physical change

Question 4

Which of the following statements about compounds is correct?

Accepted Answer

Compounds are composed of two or more elements chemically combined in a fixed ratio.

Question 5

A student measures the mass of a metal cube as 6.67 g and its edge length as 1.14 cm. What is the density of the metal? (Use $$V = L^3$)

Accepted Answer

$$4.51\ \mathrm{g/cm^3$}$$

Question 6

Which of the following is an intensive property?

Accepted Answer

Density

Question 7

Which separation technique would be most appropriate to separate a mixture of sand and water?

Accepted Answer

Filtration

Question 8

Convert 40 $$^\circC to $$Kelvin using the correct formula.

Accepted Answer

$$313.15\ \mathrm{K}$$

Question 9

Which of the following is a chemical property?

Accepted Answer

Ability to burn in air

Question 10

A car travels 17 km/L of gasoline. How many miles per gallon will the car go? (1 mile = 1.6093 km, 1 gal = 3.7854 L)

Accepted Answer

40 mi/gal

Question 11

Which of the following is NOT a pure substance?

Accepted Answer

Air

Question 12

Which of the following best describes the Law of Definite Proportions?

Accepted Answer

A compound always contains the same elements in the same proportion by mass.

Question 13

Which of the following is the correct formula to convert Celsius to Fahrenheit?

Accepted Answer

$$^\circ F = \frac{9}{5}(^\circ C) + 32$$

Question 14

Which of the following is an example of a heterogeneous mixture?

Accepted Answer

Vegetable soup

Question 15

A sample of ethanol has a mass of 20.0 g and a density of $$0.789\ \mathrm{g/cm^3$}. $$What is its volume?

Accepted Answer

$$25.3\ \mathrm{cm^3$}$$

Question 16

Which of the following is true about significant figures?

Accepted Answer

Zeros between nonzero digits are significant.

Question 17

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

Accepted Answer

Kilogram (kg)

Question 18

Which of the following best describes accuracy in measurements?

Accepted Answer

How close a measurement is to the true value.

Question 19

Which of the following is a physical property of sodium chloride (table salt)?

Accepted Answer

It is white and crystalline.

Question 20

A student adds 5.00 mL of a 100 mg/5.0 mL ibuprofen suspension to a dose for an infant weighing 18 lb. If the recommended dose is 10 mg/kg, how many mL should be given? (1 kg = 2.205 lb)

Accepted Answer

4 mL

Chapter 1: Introduction to Matter and Measurement – General Chemistry Study Notes

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