Q: Which of the following is a correct example of dimensional analysis for converting 1 inch to centimeters, given $$1\ inch = 2.54\ cm$$?

$$1\ inch \times \frac{2.54\ cm}{1\ inch} = 2.54\ cm$$

Question 1

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

Accepted Answer

Because it connects and enhances understanding in fields such as biology, physics, medicine, agriculture, and forensics.

Question 2

A sample of seawater contains both dissolved salts and suspended sand particles. How should this sample be classified?

Accepted Answer

As a heterogeneous mixture

Question 3

Which of the following is an example of an extensive property?

Accepted Answer

Mass

Question 4

A nurse is monitoring a patient’s sodium levels to prevent hyponatremia. Which property of matter is most relevant to the measurement of sodium concentration in blood?

Accepted Answer

Physical property

Question 5

Which of the following statements about molecules is correct?

Accepted Answer

Molecules are combinations of atoms held together by covalent bonds.

Question 6

A student measures the mass of a sample as 1.0785 g. How many significant digits are in this measurement?

Accepted Answer

5

Question 7

Which of the following is a chemical change?

Accepted Answer

Burning of gasoline

Question 8

Which SI prefix corresponds to $$10^{-9}$$?

Accepted Answer

nano-

Question 9

A chemist needs to convert a temperature of $$25\ ^\circ C to $$Kelvin. Which equation should be used, and what is the result?

Accepted Answer

$$T(K) = T(^\circ C) + 273.15$$; $$298.15\ K$$

Question 10

Which of the following best describes a compound?

Accepted Answer

A substance containing more than one type of atom chemically bonded in fixed proportions

Question 11

A 1.00 L sample of chocolate pudding weighs 0.2884 kg. What is its density in $$g/mL$$?

Accepted Answer

$$0.2884\ g/mL$$

Question 12

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

Accepted Answer

Brass

Question 13

Which of the following is NOT a step in the scientific approach to knowledge?

Accepted Answer

Ignore experimental results

Question 14

A student records a burette reading as 20.46 mL. Which digit is considered uncertain?

Accepted Answer

6

Question 15

Which of the following is a correct example of dimensional analysis for converting 1 inch to centimeters, given $$1\ inch = 2.54\ cm$$?

Accepted Answer

$$1\ inch 	imes \frac{2.54\ cm}{1\ inch} = 2.54\ cm$$

Question 16

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 reproducible measurements are.

Question 17

Which of the following is a physical change?

Accepted Answer

Sublimation of dry ice

Question 18

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

Accepted Answer

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

Question 19

A gold ring is made from an alloy of gold and copper. How should this material be classified?

Accepted Answer

Homogeneous mixture

Question 20

Which of the following is an example of an intensive property?

Accepted Answer

Density

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

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