Question 1

Which of the following best describes a scientific law?

Accepted Answer

A statement that describes what happens under certain conditions.

Question 2

Which step comes first in the scientific method?

Accepted Answer

Observation

Question 3

A student mixes two clear solutions and observes the formation of bubbles and a color change. What type of change has occurred?

Accepted Answer

Chemical change

Question 4

Which of the following is a pure substance?

Accepted Answer

Rust (Fe$$_2O$_3)$$

Question 5

How many significant figures are in the measurement 0.00456?

Accepted Answer

3

Question 6

Which statement correctly describes the difference between an element and a compound?

Accepted Answer

Elements are composed of only one type of material, while compounds are chemically combined from two or more elements.

Question 7

Which subatomic particle determines the identity of an element?

Accepted Answer

Proton

Question 8

A cation is formed when an atom:

Accepted Answer

Loses electrons and becomes positively charged.

Question 9

Which of the following is a heterogeneous mixture?

Accepted Answer

Salad

Question 10

Which element is the most electronegative?

Accepted Answer

Fluorine

Question 11

What is the correct formula for magnesium chloride?

Accepted Answer

MgCl$$_2$$

Question 12

Which of the following best describes an ionic bond?

Accepted Answer

A bond formed by transferring electrons from a metal to a nonmetal.

Question 13

What is the charge on a sulfur ion in the compound CaS?

Accepted Answer

$$2^-$$

Question 14

Which of the following is a polyatomic ion?

Accepted Answer

SO$$_4$$^{2-}$$

Question 15

What is the correct name for the compound P$$_2O$_5$$?

Accepted Answer

Diphosphorus pentoxide

Question 16

Which rule is used to determine the number of significant figures in the result of a multiplication or division?

Accepted Answer

The result should have the same number of significant figures as the number with the fewest significant figures.

Question 17

Which of the following is a physical change?

Accepted Answer

Breaking a pencil in half

Question 18

What is the octet rule?

Accepted Answer

Atoms want to have 8 electrons in their outermost shell to be stable.

Question 19

Which of the following is the correct name for NCl$$_3$$?

Accepted Answer

Nitrogen trichloride

Question 20

Which of the following best describes a covalent bond?

Accepted Answer

A bond formed by sharing electrons between two nonmetals.

CHEM 101 Review: Introduction to Chemistry, Matter, the Atom, and Bonding

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