Question 1

Which of the following best describes why chemistry is considered the 'central science'?

Accepted Answer

Because it connects and overlaps with many other scientific disciplines, such as biology, physics, and medicine, by studying matter at the atomic and molecular level.

Question 2

A student observes that when salt is added to water, it dissolves completely and the solution looks uniform throughout. How should this mixture be classified?

Accepted Answer

Homogeneous mixture

Question 3

Which of the following is an example of a chemical property?

Accepted Answer

Sodium reacts vigorously with water.

Question 4

Which of the following statements about elements and compounds is correct?

Accepted Answer

Compounds consist of two or more elements chemically combined in fixed proportions.

Question 5

Which of the following is a heterogeneous mixture?

Accepted Answer

Chocolate chip cookie dough

Question 6

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

Accepted Answer

Water boiling to form steam

Question 7

Which of the following best describes a compound?

Accepted Answer

A pure substance composed of two or more elements chemically combined in a fixed ratio.

Question 8

Which of the following is the correct chemical symbol for sodium?

Accepted Answer

Na

Question 9

Given the compound $$\mathrm{Al_2$(CO_3$)_2}$$, which elements are present?

Accepted Answer

Aluminum, carbon, and oxygen

Question 10

Write the chemical formula for a compound containing two copper atoms and one oxygen atom.

Accepted Answer

$$\mathrm{Cu_2O}$$

Question 11

Which of the following is an alkaline earth metal?

Accepted Answer

Ca

Question 12

Which of the following best describes a period on the periodic table?

Accepted Answer

A horizontal row of elements

Question 13

Which of the following is a property of metals?

Accepted Answer

They are malleable and ductile.

Question 14

A student proposes: 'If I increase the amount of fertilizer, my plants will grow taller.' According to the scientific method, this statement is best classified as:

Accepted Answer

A hypothesis

Question 15

Which of the following is a correct classification for the element silicon (Si) on the periodic table?

Accepted Answer

Metalloid

Question 16

Which group on the periodic table contains the noble gases?

Accepted Answer

Group 18

Question 17

A sample of matter is a colorless liquid at room temperature, boils at $$100^\circC$$, and can be separated into hydrogen and oxygen by electrolysis. How should this sample be classified?

Accepted Answer

Compound

Question 18

Which of the following is an example of a synthetic substance?

Accepted Answer

Plastic water bottle

Question 19

Which of the following best describes a chemical change?

Accepted Answer

A piece of paper burning to form ash and gases

Question 20

A student records: 'After adding 5 grams of sugar to 10 mL of water, the total mass is 15 grams.' According to the scientific method, this is an example of:

Accepted Answer

An observation

Chapter 1: Introduction to Chemistry – Study Notes

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