Question 1

Which of the following is an example of a chemical property?

Accepted Answer

Ability to combust in oxygen

Question 2

A student separates a mixture of sand and salt by adding water, filtering, and then evaporating the water. Which physical property is primarily used in the filtration step?

Accepted Answer

Particle size

Question 3

Which of the following best describes an extensive property?

Accepted Answer

Depends on the amount of substance present

Question 4

Which equation correctly relates Celsius and Fahrenheit temperatures?

Accepted Answer

$$C = \frac{5}{9}(F - 32)$$

Question 5

A graduated cylinder contains 50.0 mL of water. A piece of iron (density = 7.86 g/cm$$^3) $$with a mass of 15.7 g is dropped in. What is the new volume reading?

Accepted Answer

51.0 mL

Question 6

Which instrument is best for delivering a precise, variable volume of liquid in a titration?

Accepted Answer

Burette

Question 7

Which of the following is NOT a chemical change?

Accepted Answer

Evaporation of water

Question 8

A sample of ethanol has a mass of 39.5 g and a volume of 50.0 mL. What is its density?

Accepted Answer

$$0.79\ \mathrm{g/cm^3$}$$

Question 9

Which prefix represents $$10^{-6}$$?

Accepted Answer

Micro

Question 10

Which of the following statements about significant figures is correct?

Accepted Answer

Zeros at the end of a number with a decimal are significant

Question 11

A force of 10 N is applied to move an object 5 m. How much work is done?

Accepted Answer

$$50\ \mathrm{J}$$

Question 12

Which of the following is an example of a mixture?

Accepted Answer

Air

Question 13

Which separation technique would be most effective for separating pigments in ink?

Accepted Answer

Chromatography

Question 14

Which of the following is the correct formula for kinetic energy?

Accepted Answer

$$KE = \frac{1}{2}mv^2$

Question 15

Which of the following is an intensive property?

Accepted Answer

Boiling point

Question 16

A student measures the mass of a sample as 2.50 g and its volume as 3.20 mL. What is the density of the sample?

Accepted Answer

$$0.78\ \mathrm{g/mL}$$

Question 17

Which of the following is the lowest possible temperature?

Accepted Answer

0 K

Question 18

Which of the following is a compound?

Accepted Answer

Table salt (NaCl)

Question 19

Which of the following best describes the difference between accuracy and precision?

Accepted Answer

Accuracy is how close measurements are to the true value; precision is how closely measurements agree with each other

Question 20

A student records a measurement as 0.00450 g. How many significant figures does this value have?

Accepted Answer

3

Fundamental Concepts and Measurements in General Chemistry

Guida di studio - Domande di pratica

Study guide - Flashcard