Deck 1

Question 1

What is the atomic number of an element?

Answer 1

The number of protons in the nucleus of an atom.

Question 2

True or False: The mass number is the sum of protons and neutrons in an atom.

Answer 2

True

Question 3

Fill in the blank: The chemical formula for water is ____.

Answer 3

H2O

Question 4

What is an ion?

Answer 4

An atom or molecule that has a net electric charge due to the loss or gain of one or more electrons.

Question 5

What is the pH scale used for?

Answer 5

To measure the acidity or alkalinity of a solution.

Question 6

What is a catalyst?

Answer 6

A substance that increases the rate of a chemical reaction without being consumed.

Question 7

What is the formula for calculating density?

Answer 7

Density = Mass / Volume

Question 8

True or False: All alkali metals are found in Group 1 of the periodic table.

Answer 8

True

Question 9

What is the process of a solid turning directly into a gas called?

Answer 9

Sublimation

Question 10

What is the principle behind the law of conservation of mass?

Answer 10

Mass is neither created nor destroyed in a chemical reaction.

Question 11

What do we call a solution that has a pH of 7?

Answer 11

Neutral solution

Question 12

Fill in the blank: The chemical symbol for sodium is ____.

Answer 12

Na

Question 13

What is an exothermic reaction?

Answer 13

A reaction that releases energy in the form of heat.

Question 14

What is the main component of natural gas?

Answer 14

Methane (CH4)

Question 15

True or False: Acids taste bitter.

Answer 15

False

Question 16

What is the term for a substance that increases the concentration of hydrogen ions in a solution?

Answer 16

Acid

Question 17

What is the formula to calculate the number of moles?

Answer 17

Moles = Mass (g) / Molar Mass (g/mol)

Question 18

What do you call the horizontal rows in the periodic table?

Answer 18

Periods

Question 19

What is the difference between an element and a compound?

Answer 19

An element consists of one type of atom, while a compound consists of two or more different types of atoms chemically bonded together.

Question 20

What is the name of the gas released during photosynthesis?

Answer 20

Oxygen (O2)

Question 21

Fill in the blank: The process of breaking down glucose to release energy is called ____.

Answer 21

Cellular respiration

Question 22

What is the term for the amount of energy required to raise the temperature of 1 gram of water by 1 degree Celsius?

Answer 22

Calorie

Question 23

True or False: Noble gases are highly reactive.

Answer 23

False

Question 24

What is a combustion reaction?

Answer 24

A chemical reaction that occurs when a substance combines with oxygen, releasing energy in the form of light or heat.

Question 25

What is the law of definite proportions?

Answer 25

A chemical compound always contains its component elements in fixed ratio by mass.

Question 26

What is the main characteristic of metals?

Answer 26

They are good conductors of heat and electricity.

Question 27

What is the term for the energy required to break the bonds in a chemical reaction?

Answer 27

Activation energy