Question 1

Which of the following best describes the scope of chemistry?

Accepted Answer

The study of composition, structure, properties, and reactions of matter

Question 2

A student drops an antacid tablet into water and observes bubbles forming. Which aspect of chemistry is being demonstrated?

Accepted Answer

Reaction

Question 3

Which of the following is NOT considered matter?

Accepted Answer

Light

Question 4

Toothpaste is described as a combination of many chemicals. Which statement about chemicals is correct?

Accepted Answer

Chemicals have the same composition and properties wherever found

Question 5

Which step in the scientific method involves proposing a possible explanation for an observation?

Accepted Answer

Hypothesis

Question 6

A person visits two friends with cats and experiences allergic symptoms both times. What is the best scientific conclusion?

Accepted Answer

The person is allergic to cats

Question 7

Which of the following is the correct scientific notation for the number 64,000?

Accepted Answer

$$6.4 	imes 10^4$

Question 8

What is the coefficient in the scientific notation $$2.4 	imes 10^3$?

Accepted Answer

$$2.4$$

Question 9

Convert 0.021 to scientific notation.

Accepted Answer

$$2.1 	imes 10$$^{-2}$$

Question 10

Which of the following numbers is written correctly in scientific notation?

Accepted Answer

$$7.2 	imes 10^7$

Question 11

A chickenpox virus has a diameter of $$3 	imes 10$$^{-7}$$ cm. Which of the following is the correct standard notation?

Accepted Answer

0.0000003 cm

Question 12

Which part of the scientific method is modified if the results of experiments do not support the hypothesis?

Accepted Answer

Hypothesis

Question 13

A scientist observes that a chemical reaction produces heat and gas. Which property of the substance is being investigated?

Accepted Answer

Reaction

Question 14

Which of the following is an example of applying the scientific method in everyday life?

Accepted Answer

Observing symptoms, proposing a cause, and testing by changing environment

Question 15

What is the correct scientific notation for the width of a human hair, 0.000008 meters?

Accepted Answer

$$8 	imes 10$$^{-6}$$ m

Question 16

Which statement about scientific notation is correct?

Accepted Answer

The coefficient must be at least 1 but less than 10

Question 17

A mass of a human is $$6.8 	imes 10^1$ kg. What is the mass in standard notation?

Accepted Answer

68 kg

Question 18

Which of the following is NOT a step in the scientific method?

Accepted Answer

Ignoring experimental results

Question 19

If a hypothesis is repeatedly supported by experiments, what does it become?

Accepted Answer

A theory

Question 20

Which of the following best illustrates the importance of chemistry in everyday life?

Accepted Answer

Chemistry helps explain the reactions in antacid tablets, toothpaste, and allergies

Introduction to Chemistry: Matter, Scientific Method, and Scientific Notation

Guida di studio - Domande di pratica