Q: Which of the following is a correct example of dimensional analysis for converting $$1$$ inch to centimeters?

$$1\ \text{inch} \times \dfrac{2.54\ \text{cm}}{1\ \text{inch}} = 2.54\ \text{cm}$$

Question 1

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

Accepted Answer

It connects and helps explain concepts in biology, physics, medicine, agriculture, and more.

Question 2

A nurse is concerned about the effect of ibuprofen on patient care. Which property of matter is most relevant when considering how ibuprofen interacts with the body?

Accepted Answer

Its chemical composition

Question 3

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

Accepted Answer

Filtered seawater

Question 4

Which statement correctly distinguishes between an element and a compound?

Accepted Answer

An element contains only one type of atom and cannot be decomposed, while a compound contains more than one type of atom and can be decomposed.

Question 5

A sample of brass is described as a homogeneous mixture. What does this mean about its composition?

Accepted Answer

Its composition is uniform throughout the sample.

Question 6

Which separation technique would be most appropriate for separating a solid from a liquid in a heterogeneous mixture?

Accepted Answer

Filtration

Question 7

Which of the following is an extensive property?

Accepted Answer

Mass

Question 8

Which of the following changes is a chemical change?

Accepted Answer

Burning gasoline

Question 9

A student measures the mass of a carbon atom as $$1.992 	imes 10$$^{-23}$$ g. What is this notation called?

Accepted Answer

Scientific notation

Question 10

Which SI unit is used to measure the amount of substance?

Accepted Answer

Mole

Question 11

Convert a temperature of $$25^{\circ}C$ to Kelvin using the correct formula.

Accepted Answer

$$T(K) = T$$(^{\circ}$$C) + 273.15 = 25 + 273.15 = 298.15\ K$$

Question 12

A cup of chocolate pudding weighs $$0.2884 kg $$and has a volume of $$0.25 L. $$What is its density in $$g/mL$$?

Accepted Answer

$$\dfrac{288.4\ g}{250\ mL} = 1.1536\ g/mL$$

Question 13

Which of the following statements about significant digits is correct?

Accepted Answer

Trailing zeros are only significant if there is a decimal point.

Question 14

A measurement is recorded as $$20.46 mL. $$How many significant digits does this value have?

Accepted Answer

4

Question 15

Which of the following best describes accuracy in scientific measurement?

Accepted Answer

How close a measurement is to the true value

Question 16

A student rounds the number $$3.73178 to $$two decimal places. What is the correct rounded value?

Accepted Answer

$$3.73$$

Question 17

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

Accepted Answer

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

Question 18

Which of the following is NOT a physical transformation?

Accepted Answer

Burning wood

Question 19

Which of the following is a correct example of dimensional analysis for converting $$1$$ inch to centimeters?

Accepted Answer

$$1\ 	ext{inch} 	imes \dfrac{2.54\ 	ext{cm}}{1\ 	ext{inch}} = 2.54\ 	ext{cm}$$

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

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