Question 1

What is the smallest unit of matter that retains the properties of an element?

Accepted Answer

Atom

Answer

Electron

Answer

Compound

Answer

Molecule

Question 2

Which of the following is a state of matter?

Accepted Answer

Liquid

Answer

Compound

Answer

Atom

Answer

Molecule

Question 3

What is the chemical symbol for water?

Accepted Answer

H2O

Answer

CO2

Answer

O2

Answer

NaCl

Question 4

Which of the following elements is a noble gas?

Accepted Answer

Neon

Answer

Hydrogen

Answer

Nitrogen

Answer

Oxygen

Question 5

Which of these is a property of metals?

Accepted Answer

Good conductors of heat and electricity

Answer

Poor conductors of heat

Answer

Brittle and non-lustrous

Answer

Always liquid at room temperature

Question 6

What do we call a substance made of two or more different elements that are chemically bonded together?

Accepted Answer

Compound

Answer

Element

Answer

Mixture

Answer

Solution

Question 7

What is the process called when a solid changes directly to a gas without becoming a liquid?

Accepted Answer

Sublimation

Answer

Condensation

Answer

Evaporation

Answer

Freezing

Question 8

What is the pH range of acidic solutions?

Accepted Answer

0 to 6

Answer

7 to 14

Answer

14 to 20

Answer

6 to 8

Question 9

Which particle in an atom has a positive charge?

Accepted Answer

Proton

Answer

Neutron

Answer

Photon

Answer

Electron

Question 10

What type of change occurs when a substance alters its physical form but not its chemical composition?

Accepted Answer

Physical change

Answer

Nuclear change

Answer

Chemical change

Answer

Combustion

Question 11

What is the basic unit of matter?

Accepted Answer

Atom

Answer

Compound

Answer

Element

Answer

Molecule

Question 12

Which of the following is a state of matter?

Accepted Answer

Liquid

Answer

Evaporate

Answer

Solidify

Answer

Condense

Question 13

What is formed when two or more elements chemically combine?

Accepted Answer

Compound

Answer

Solution

Answer

Mixture

Answer

Alloy

Question 14

What is the pH scale used to measure?

Accepted Answer

Acidity or alkalinity

Answer

Volume

Answer

Density

Answer

Temperature

Question 15

What do we call a substance that speeds up a chemical reaction?

Accepted Answer

Catalyst

Answer

Reagent

Answer

Solvent

Answer

Substrate

Question 16

Which particle has a positive charge?

Accepted Answer

Proton

Answer

Nucleus

Answer

Neutron

Answer

Electron

Question 17

What is the most abundant gas in the Earth's atmosphere?

Accepted Answer

Nitrogen

Answer

Helium

Answer

Carbon Dioxide

Answer

Oxygen

Question 18

What is the chemical symbol for water?

Accepted Answer

H2O

Answer

O2

Answer

H2

Answer

CO2

Question 19

Which process involves a liquid turning into a gas?

Accepted Answer

Evaporation

Answer

Sublimation

Answer

Condensation

Answer

Freezing

Question 20

What do we call the center of an atom?

Accepted Answer

Nucleus

Answer

Proton

Answer

Neutron

Answer

Electron

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