$$44.7\,cm \times \frac{1\,in}{2.54\,cm} = 17.6\,in$$

$$1255\,cm^2$ \times \left(\frac{1\,in}{2.54\,cm}\$$right)^2$$ = 194.6\,in^2$

Question 1

Which of the following best describes a compound?

Accepted Answer

A pure substance formed by chemically joining two or more elements.

Question 2

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

Accepted Answer

A salad with lettuce, tomatoes, and cucumbers

Question 3

Which of the following represents a chemical change?

Accepted Answer

Burning a piece of paper

Question 4

A sample of liquid has a mass of 27.2 g and a volume of 25.0 mL. What is its density?

Accepted Answer

$$d = \frac{27.2\,g}{25.0\,mL} = 1.09\,g/mL$$

Question 5

Which of the following is an intensive property?

Accepted Answer

Density

Question 6

Convert 44.7 cm to inches. (Given: $$1\,in = 2.54\,cm)$$

Accepted Answer

$$44.7\,cm 	imes \frac{1\,in}{2.54\,cm} = 17.6\,in$$

Question 7

Which of the following numbers has three significant figures?

Accepted Answer

2.90 	imes $$10^5$$

Question 8

Which of the following is a physical property?

Accepted Answer

Boiling point

Question 9

A cube measures $$10.0\,mm 	imes 10.0\,mm 	imes 10.0\,mm$$ and has a mass of $$4.70\,g. $$What is its density in $$g/cm^3$$?

Accepted Answer

$$d = \frac{4.70\,g}{1.00\,cm^3$} = 4.70\,g/cm^3$

Question 10

Which of the following is an exact number?

Accepted Answer

1 inch = 2.54 cm

Question 11

Which of the following is a homogeneous mixture?

Accepted Answer

A well-stirred mixture of food dye and water

Question 12

Which of the following chemical formulas represents an elemental substance?

Accepted Answer

$$O_3$$

Question 13

Which of the following is the correct scientific notation for 0.00006?

Accepted Answer

$$6.0 	imes 10$$^{-5}$$

Question 14

A student adds 12.34 g, 0.56 g, and 7.1 g. What is the sum rounded to the correct number of decimal places?

Accepted Answer

$$12.34 + 0.56 + 7.1 = 20.0\,g$$

Question 15

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 close measurements are to each other.

Question 16

Which of the following is a physical change?

Accepted Answer

Melting of ice

Question 17

Convert 1255 $$cm^2 to$$ $$in^2. ($$Given: $$1\,in = 2.54\,cm)$$

Accepted Answer

$$1255\,cm^2$ 	imes \left(\frac{1\,in}{2.54\,cm}\$$right)^2$$ = 194.6\,in^2$

Question 18

Which of the following is a chemical property?

Accepted Answer

Flammability

Matter and Measurement – Chapter 1 Study Notes

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