Q: Convert 694 kg to micrograms ($$\mug).$$

$$6.94 \times 10$$^{14}$$ \mu g$$

Q: What is the formula for density?

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

Question 1

Which of the following best describes a compound?

Accepted Answer

A substance composed of two or more different elements that are chemically bonded together.

Question 2

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

Accepted Answer

A cup of black coffee

Question 3

Which process is a chemical change?

Accepted Answer

Cooking an egg

Question 4

Which of the following is a reversible change?

Accepted Answer

Melting a chocolate bar then re-solidifying it in the freezer

Question 5

Which of the following represents a chemical property?

Accepted Answer

It reacts explosively with oxygen gas.

Question 6

Which of the following is NOT a physical property?

Accepted Answer

An iron bar rusts.

Question 7

Which of the following is an intensive property?

Accepted Answer

Melting point

Question 8

Which of the following is an extensive property?

Accepted Answer

Moles

Question 9

What is the formula for converting Celsius to Kelvin?

Accepted Answer

$$K = 	ext{ºC} + 273$$

Question 10

At what temperature are the Celsius and Fahrenheit scales equal?

Accepted Answer

$$-40$$

Question 11

Which scientific notation value is written correctly?

Accepted Answer

$$5.220 x 10^3$$

Question 12

What is the SI base unit for mass?

Accepted Answer

Kilogram (kg)

Question 13

Convert 694 kg to micrograms ($$\mug).$$

Accepted Answer

$$6.94 	imes 10$$^{14}$$ \mu g$$

Question 14

How many significant figures are in the measurement 0.003840?

Accepted Answer

4

Question 15

When multiplying or dividing numbers, the final answer should contain:

Accepted Answer

The least significant figures from the input values.

Question 16

A TA can grade 4 assignments per hour. If each assignment has 12 questions, how many questions can the TA grade in 130 minutes?

Accepted Answer

104

Question 17

What is the formula for density?

Accepted Answer

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

Question 18

A piece of unknown solid weighs 0.045 lbs. When placed in a beaker, the water level increases from 200 mL to 260 mL. What is the density of the solid in g/mL? (1 lb = 453.6 g)

Accepted Answer

0.87 g/mL

Question 19

If the density of a certain spherical atomic nucleus is $$1.0 	imes 10$$^{14}$$ g/cm^3$ and its mass is 3.5$$ 	imes $$10^{-23} g$$, what is the radius in angstroms ($$	ext{Å}$$)? (Volume of sphere: $$V = \frac{4}{3}\pi r^3$)

Accepted Answer

3.0 Å

Introduction to General Chemistry: Classification, Properties, and Measurement of Matter

Guida di studio - Domande di pratica

Study guide - Flashcard