Q: What is the formula for converting Celsius to Fahrenheit?

$$\mathrm{F} = (1.8 \times \mathrm{C}) + 32$$

Question 1

Which of the following best describes a pure substance?

Accepted Answer

A material with a fixed composition and distinct properties, such as water or gold.

Question 2

Which of the following is a chemical property?

Accepted Answer

Reactivity with oxygen

Question 3

Which of the following changes is a physical change?

Accepted Answer

Boiling water

Question 4

Express the number 0.0000456 in scientific notation.

Accepted Answer

$$4.56 	imes 10$$^{-5}$$

Question 5

How many significant digits are in the measurement 0.1400 kg?

Accepted Answer

4

Question 6

A graduated cylinder contains 25.0 mL of water. If 0.01 mL is added, what is the total volume reported with the correct number of decimal places?

Accepted Answer

25.0 mL

Question 7

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

Accepted Answer

micro

Question 8

A sample of silver has a mass of 1000 g and a density of $$10.40 \ \mathrm{g/cm^3$}. $$What is its volume in $$\mathrm{cm^3$}$$?

Accepted Answer

$$96.2 \ \mathrm{cm^3$}$$

Question 9

Convert 77 miles to inches. (1 mile = 5280 ft, 1 ft = 12 in)

Accepted Answer

$$4,878,720$$ inches

Question 10

Which of the following is an exact number?

Accepted Answer

The number of eggs in a dozen

Question 11

A student multiplies 3.4 g by 0.023 g. How many significant digits should the answer have?

Accepted Answer

1

Question 12

Which of the following statements about density is correct?

Accepted Answer

Density is a physical property and depends on temperature.

Question 13

What is the formula for converting Celsius to Fahrenheit?

Accepted Answer

$$\mathrm{F} = (1.8 	imes \mathrm{C}) + 32$$

Question 14

A 20.0 g sample of gold is heated from 25°C to 55°C. If the specific heat of gold is $$0.031 \ \mathrm{cal/g\cdot ^\circ C}$$, how many calories of heat are required?

Accepted Answer

$$18.6$$ cal

Question 15

Which of the following is NOT a correct step in dimensional analysis for unit conversion?

Accepted Answer

Multiply the given unit by a conversion factor so the desired unit cancels.

Question 16

Which of the following is true about significant digits in addition and subtraction?

Accepted Answer

The answer should have the same number of decimal places as the measurement with the fewest decimal places.

Question 17

Which of the following is a correct conversion factor for 1 kilogram?

Accepted Answer

$$1 \ \mathrm{kg} = 1000 \ \mathrm{g}$$

Question 18

Which of the following is a physical change?

Accepted Answer

Evaporation of alcohol

Question 19

What is the density of a substance if a 2.500 g sample occupies a volume of 1.575 $$\mathrm{cm^3$}$$?

Accepted Answer

$$1.59 \ \mathrm{g/cm^3$}$$

Chapter 1: Matter and Measurements – Structured Study Notes

Guida di studio - Domande di pratica

Study guide - Flashcard