Chem

Question 1

What is the chemical formula for water?

Answer 1

H2O

Question 2

True or False: The atomic number of an element is the number of protons in its nucleus.

Answer 2

True

Question 3

Fill in the blank: The process of a solid turning directly into a gas is called __________.

Answer 3

sublimation

Question 4

What is the pH value of pure water at 25°C?

Answer 4

7

Question 5

Which particle has a negative charge?

Answer 5

Electron

Question 6

Multiple Choice: Which of the following is a noble gas? A) Oxygen B) Nitrogen C) Argon D) Carbon

Answer 6

C) Argon

Question 7

What is the term for the amount of matter in an object?

Answer 7

Mass

Question 8

True or False: Isotopes of an element have the same number of protons but different numbers of neutrons.

Answer 8

True

Question 9

What is the main gas produced during photosynthesis?

Answer 9

Oxygen

Question 10

Fill in the blank: The reaction of an acid with a base is called __________.

Answer 10

neutralization

Question 11

Which law states that mass is neither created nor destroyed in a chemical reaction?

Answer 11

Law of Conservation of Mass

Question 12

Multiple Choice: Which of the following is a property of metals? A) Brittle B) Good conductors of heat C) Dull appearance D) Low density

Answer 12

B) Good conductors of heat

Question 13

What is the process of separating a liquid mixture into its components by heating and cooling called?

Answer 13

Distillation

Question 14

True or False: An exothermic reaction absorbs heat.

Answer 14

False

Question 15

What is the chemical symbol for gold?

Answer 15

Au

Question 16

Fill in the blank: The smallest unit of a chemical compound is called a __________.

Answer 16

molecule

Question 17

What is the primary component of natural gas?

Answer 17

Methane

Question 18

Multiple Choice: Which of the following elements is a halogen? A) Sodium B) Chlorine C) Calcium D) Neon

Answer 18

B) Chlorine

Question 19

What type of bond involves the sharing of electron pairs between atoms?

Answer 19

Covalent bond

Question 20

True or False: Acids turn litmus paper blue.

Answer 20

False

Question 21

What is the term for the temperature at which a solid becomes a liquid?

Answer 21

Melting point

Question 22

Fill in the blank: The __________ is the central part of an atom containing protons and neutrons.

Answer 22

nucleus

Question 23

What is the unit of pressure in the SI system?

Answer 23

Pascal

Question 24

Multiple Choice: Which of the following is a physical change? A) Burning wood B) Dissolving sugar in water C) Rusting iron D) Cooking an egg

Answer 24

B) Dissolving sugar in water

Question 25

What is the main component of the Earth's atmosphere?

Answer 25

Nitrogen

Question 26

True or False: A saturated solution contains the maximum amount of solute that can dissolve at a given temperature.

Answer 26

True

Question 27

Fill in the blank: The __________ scale measures the hardness of minerals.

Answer 27

Mohs

Question 28

What is the process of a liquid turning into a gas called?

Answer 28

Evaporation

Question 29

Multiple Choice: Which of the following is not a type of chemical bond? A) Ionic B) Covalent C) Metallic D) Gravitational

Answer 29

D) Gravitational

Question 30

What is the chemical formula for sodium chloride?

Answer 30

NaCl

Question 31

True or False: The boiling point of water decreases with increasing atmospheric pressure.

Answer 31

False

Question 32

Fill in the blank: The __________ is a measure of the average kinetic energy of particles in a substance.

Answer 32

temperature

Question 33

What is the term for a solution that has a pH less than 7?

Answer 33

Acidic solution

Question 34

Multiple Choice: Which of the following ions has a +2 charge? A) Na+ B) Ca2+ C) Cl- D) O2-

Answer 34

B) Ca2+

Question 35

What is the term for the energy required to start a chemical reaction?

Answer 35

Activation energy

Question 36

True or False: All metals are ductile.

Answer 36

False

Question 37

Fill in the blank: The __________ theory explains the behavior of gases.

Answer 37

Kinetic Molecular

Question 38

What is the primary use of sulfuric acid?

Answer 38

Battery production

Question 39

Multiple Choice: Which of the following is an alkali metal? A) Magnesium B) Potassium C) Iron D) Mercury

Answer 39

B) Potassium

Question 40

What is the term for a substance that speeds up a chemical reaction without being consumed?

Answer 40

Catalyst

Question 41

True or False: A base accepts protons in a chemical reaction.

Answer 41

True

Question 42

Fill in the blank: The __________ of a solution is the amount of solute dissolved in a given volume of solvent.

Answer 42

concentration

Question 43

What is the common name for dihydrogen monoxide?

Answer 43

Water

Question 44

Multiple Choice: Which of the following is a characteristic of ionic compounds? A) Low melting points B) Conduct electricity in solid form C) High melting points D) Gaseous at room temperature

Answer 44

C) High melting points

Question 45

What is the term for the process of a gas turning into a liquid?

Answer 45

Condensation

Question 46

True or False: The periodic table is arranged by increasing atomic mass.

Answer 46

False

Question 47

Fill in the blank: The __________ is a vertical column in the periodic table.

Answer 47

group

Question 48

What is the primary gas released during respiration?

Answer 48

Carbon dioxide

Question 49

Multiple Choice: Which of the following compounds is an example of an organic compound? A) H2O B) CO2 C) CH4 D) NaCl

Answer 49

C) CH4

Question 50

What is the term for the mass of one mole of a substance?

Answer 50

Molar mass

Question 51

True or False: The law of definite proportions states that a chemical compound contains the same elements in the same proportions by mass, regardless of the size or source of the sample.

Answer 51

True

Question 52

Fill in the blank: The __________ of a solution is the temperature at which it freezes.

Answer 52

freezing point

Question 53

What is the chemical symbol for silver?

Answer 53

Ag

Question 54

Multiple Choice: Which of the following is a non-metal? A) Iron B) Oxygen C) Copper D) Gold

Answer 54

B) Oxygen

Question 55

What is the term for the process of separating a mixture based on particle size?

Answer 55

Filtration

Question 56

True or False: A saturated solution can hold more solute at a given temperature.

Answer 56

False

Question 57

Fill in the blank: The __________ is a measure of how much solute can dissolve in a solvent at a given temperature.

Answer 57

solubility

Question 58

What is the primary component of air?

Answer 58

Nitrogen

Question 59

Multiple Choice: Which of the following is a strong acid? A) Acetic acid B) Hydrochloric acid C) Carbonic acid D) Phosphoric acid

Answer 59

B) Hydrochloric acid

Question 60

What is the term for the energy stored in chemical bonds?

Answer 60

Chemical potential energy

Question 61

True or False: The atomic mass of an element is the weighted average of the masses of its isotopes.

Answer 61

True

Question 62

Fill in the blank: The __________ is the amount of space an object occupies.

Answer 62

volume

Question 63

What is the chemical formula for carbon dioxide?

Answer 63

CO2

Question 64

Multiple Choice: Which of the following elements is a metalloid? A) Aluminum B) Silicon C) Gold D) Iron

Answer 64

B) Silicon

Question 65

What is the term for a chemical reaction that releases energy?

Answer 65

Exothermic reaction

Question 66

True or False: All alkali metals are found in nature in their elemental form.

Answer 66

False

Question 67

Fill in the blank: The __________ is the temperature at which a liquid boils.

Answer 67

boiling point

Question 68

What is the primary use of hydrochloric acid?

Answer 68

pH regulation and cleaning