Question 1

Which of the following best describes the main goal of green chemistry?

Accepted Answer

To develop chemical processes that reduce pollution and create products that do not harm future generations.

Question 2

A scientist is testing a new fertilizer to see if it increases crop yield. She repeats the experiment several times and gets similar results each time. Which property of science does this demonstrate?

Accepted Answer

Reproducible

Question 3

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

Accepted Answer

Boiling water to produce steam

Question 4

A block has a mass of 200 g and a volume of 50 mL. What is its density?

Accepted Answer

$D = \frac{200\ \mathrm{g}}{50\ \mathrm{mL}} = 4\ \mathrm{g/mL}$

Question 5

Which of the following best illustrates the difference between science and technology?

Accepted Answer

Science is the study of nature, while technology is the application of scientific knowledge for practical use.

Question 6

Which of the following is a homogeneous mixture?

Accepted Answer

Salt dissolved in water

Question 7

Rachel Carson’s 'Silent Spring' is significant because it:

Accepted Answer

Raised awareness about the environmental dangers of pesticide use.

Question 8

Which of the following is NOT a characteristic of scientific theories?

Accepted Answer

They are always final and unchangeable.

Question 9

A student is asked to critically evaluate the use of chlorine as a disinfectant. Which of the following best demonstrates critical thinking in this context?

Accepted Answer

Questioning both the benefits and potential risks of chlorine use, and considering alternative disinfectants.

Question 10

Which of the following best describes an element?

Accepted Answer

A pure substance consisting of only one kind of atom.

Question 11

Which of the following is a real-world example of a chemical change?

Accepted Answer

Burning wood in a fireplace

Question 12

A sample of metal has a mass of 27 g and a volume of 3 cm$^3$. What is its density?

Accepted Answer

$D = \frac{27\ \mathrm{g}}{3\ \mathrm{cm}^3} = 9\ \mathrm{g/cm}^3$

Question 13

Which of the following statements about energy is correct?

Accepted Answer

Energy is the ability to do work or produce heat.

Question 14

Which of the following is an example of applying scientific research to solve a societal problem?

Accepted Answer

Developing biodegradable plastics to reduce environmental pollution.

Question 15

Which of the following best describes a compound?

Accepted Answer

A substance formed when two or more elements are chemically bonded.

Question 16

Which of the following is a heterogeneous mixture?

Accepted Answer

Sand and water

Question 17

Which of the following is a key benefit of using SI units in chemistry?

Accepted Answer

They allow for consistent and standardized measurements across the scientific community.

Question 18

Which of the following best describes a tentative scientific explanation?

Accepted Answer

A hypothesis that can be changed as new evidence is discovered.

Question 19

A car engine converts chemical energy from gasoline into which form of energy to move the car?

Accepted Answer

Kinetic energy

Question 20

Which of the following is an example of a scientific model being predictive?

Accepted Answer

A climate change model forecasts future temperature increases based on current data.

Introduction to Chemistry: Study Guide Notes

Study Guide - Practice Questions

Study Guide - Flashcards