Q: A solution contains 0.0026 g of phosphorus. Express this value in milligrams using scientific notation.

$$2.6 \times 10$$^{0}$$ \ \mathrm{mg}$$

Question 1

Which of the following best describes the substance shown in the first image (white crystalline solid)?

Accepted Answer

A pure substance, specifically a compound

Question 2

The second image shows sucrose being added to water. What type of change is occurring as the sucrose dissolves?

Accepted Answer

A physical change, because the chemical identity of sucrose remains the same

Question 3

The third image shows oil and water in a beaker. How would you classify this mixture?

Accepted Answer

A heterogeneous mixture

Question 4

Refer to the fourth image. What is the correct way to express 215 in scientific notation with three significant figures?

Accepted Answer

$$2.15 	imes 10^2$

Question 5

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

Accepted Answer

Sugar caramelizing when heated

Question 6

Which of the following statements about significant figures is correct?

Accepted Answer

Zeroes at the end of a number and after the decimal point are significant.

Question 7

A sample of water is heated from $$20^\circ \mathrm{C} to$$ $$80^\circ \mathrm{C}. If $$the mass of water is 100 g and the specific heat is $$1.00 \ \mathrm{cal}/(\mathrm{g} \cdot ^\circ \mathrm{C})$$, how much heat is required?

Accepted Answer

$$6000 \ \mathrm{cal}$$

Question 8

Which of the following is the correct conversion factor to change from milliliters (mL) to liters (L)?

Accepted Answer

$$1 \ \mathrm{mL} = 0.001 \ \mathrm{L}$$

Question 9

A patient weighs 154 lb. What is their mass in kilograms? (1 kg = 2.205 lb)

Accepted Answer

$$69.8 \ \mathrm{kg}$$

Question 10

Which of the following best describes the term 'density'?

Accepted Answer

The mass of an object per unit volume

Question 11

Which of the following is a derived SI unit?

Accepted Answer

Gram per cubic centimeter ($$\mathrm{g/cm^3$})$$

Question 12

A solution contains 0.0026 g of phosphorus. Express this value in milligrams using scientific notation.

Accepted Answer

$$2.6 	imes 10$$^{0}$$ \ \mathrm{mg}$$

Question 13

Which of the following is the correct formula to convert a temperature from Celsius to Kelvin?

Accepted Answer

$$K = ^\circ C + 273.15$$

Question 14

A sample has a mass of 25.0 g and a density of $$0.785 \ \mathrm{g/mL}. $$What is its volume in mL?

Accepted Answer

$$31.8 \ \mathrm{mL}$$

Question 15

Which of the following is a correct statement about the SI base units?

Accepted Answer

The SI base unit for length is the meter (m).

Question 16

Which of the following is the correct way to round 4.5832 to two significant figures?

Accepted Answer

4.6

Question 17

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

Accepted Answer

Salt water

Question 18

Which of the following is the correct relationship for specific gravity?

Accepted Answer

Specific gravity = density of substance / density of water

Question 19

A student measures the length of a pencil as 15.30 cm. How many significant figures are in this measurement?

Accepted Answer

4

Question 20

Which of the following is the correct conversion from 0.50 quarts to deciliters? (1 qt = 946 mL, 1 dL = 100 mL)

Accepted Answer

$$4.7 \ \mathrm{dL}$$

Chapter 1: Matter and Measurement – Study Notes

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