$$\text{Density} = \frac{\text{mass}}{\text{volume}}$$

$$1\ \text{in} = 2.54\ \text{cm}$$

$$\text{F} = \frac{9}{5} \times \text{C} + 32$$

Question 1

Which of the following statements best describes a compound?

Accepted Answer

A substance composed of two or more elements chemically united in fixed proportions with unique properties.

Question 2

Which property is classified as intensive?

Accepted Answer

Density

Question 3

A student measures the mass of a sample as 0.004560 g. How many significant figures does this measurement have?

Accepted Answer

4

Question 4

Which of the following is a chemical property?

Accepted Answer

Ability to react with hydrochloric acid

Question 5

Which of the following is a polyatomic cation?

Accepted Answer

NH\_4\^+

Question 6

Which of the following mixtures is heterogeneous?

Accepted Answer

Sand mixed with iron filings

Question 7

What is the correct scientific notation for 0.0001234 with four significant figures?

Accepted Answer

$$1.234 	imes 10$$^{-3}$$

Question 8

Which of the following ions is formed by Group 2A elements?

Accepted Answer

Be\^2+

Question 9

A balance measures to the nearest 0.01 g. If you weigh a sample and record 12.14 g, which digit is uncertain?

Accepted Answer

4 (the hundredths place)

Question 10

Which of the following is NOT a guideline for using significant figures?

Accepted Answer

Zeros to the left of the first nonzero digit are significant.

Question 11

Which of the following is the correct formula for density?

Accepted Answer

$$	ext{Density} = \frac{	ext{mass}}{	ext{volume}}$$

Question 12

A sample has a mass of 14.62 g and a density of 1.345 g/mL. What is its volume, rounded to the correct number of significant figures?

Accepted Answer

$$1.087\ 	ext{mL}$$

Question 13

Which of the following is a correct conversion factor for length?

Accepted Answer

$$1\ 	ext{in} = 2.54\ 	ext{cm}$$

Question 14

Which of the following is a physical change?

Accepted Answer

Ice melting to form water

Question 15

Which of the following is a correct statement about compounds?

Accepted Answer

Compounds cannot be separated into simpler substances by physical means.

Question 16

Which of the following ions is a polyatomic anion?

Accepted Answer

NO\_3\^-

Question 17

A student adds $$3.25 	imes 10^2$ and 1.45$$ 	imes $$10^4. $$What is the correct first step?

Accepted Answer

Convert both numbers to the same exponent.

Question 18

Which of the following is true about the scientific method?

Accepted Answer

A law is a concise verbal or mathematical statement that is always the same under the same conditions.

Question 19

Which of the following is the correct formula to convert Celsius to Fahrenheit?

Accepted Answer

$$	ext{F} = \frac{9}{5} 	imes 	ext{C} + 32$$

Question 20

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

Accepted Answer

Volume

chapter 1 lec 1

Guida di studio - Domande di pratica