Chemisty

Question 1

What is the atomic number of Carbon?

Answer 1

6

Question 2

True or False: The pH scale ranges from 0 to 14.

Answer 2

True

Question 3

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

Answer 3

H2O

Question 4

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

Answer 4

Covalent bond

Question 5

Which element has the symbol ‘Na’?

Answer 5

Sodium

Question 6

What is the primary component of organic compounds?

Answer 6

Carbon

Question 7

What is the pH of pure water at 25 degrees Celsius?

Answer 7

7

Question 8

True or False: Ionic bonds are formed when electrons are shared.

Answer 8

False

Question 9

What is the molecular formula for glucose?

Answer 9

C6H12O6

Question 10

Which group in the periodic table contains noble gases?

Answer 10

Group 18

Question 11

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

Answer 11

Vaporization

Question 12

Fill in the blank: The chemical bond formed by the transfer of electrons is called a ____ bond.

Answer 12

Ionic

Question 13

What is the most abundant element in the universe?

Answer 13

Hydrogen

Question 14

What is the term for substances that cannot be broken down into simpler substances?

Answer 14

Elements

Question 15

True or False: Acids have a pH less than 7.

Answer 15

True

Question 16

Which compound is a common acid found in vinegar?

Answer 16

Acetic acid

Question 17

What is the chemical formula for table salt?

Answer 17

NaCl

Question 18

What type of reaction involves the breaking down of a compound into simpler products?

Answer 18

Decomposition reaction

Question 19

Which particle has a positive charge?

Answer 19

Proton

Question 20

What is the term for a mixture of two or more substances that are not chemically bonded?

Answer 20

Mixture

Question 21

Fill in the blank: The main component of the Earth’s atmosphere is ____.

Answer 21

Nitrogen

Question 22

What is the formula for calculating pH?

Answer 22

pH = -log[H+]

Question 23

True or False: Water is a polar molecule.

Answer 23

True

Question 24

What is the term for the energy required to break a bond?

Answer 24

Bond dissociation energy

Question 25

Which of the following is an organic compound: CH4, NaCl, H2O?

Answer 25

CH4

Question 26

What is the primary reason for the high boiling point of water?

Answer 26

Hydrogen bonding

Question 27

What is the term for the number of protons in the nucleus of an atom?

Answer 27

Atomic number

Question 28

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

Answer 28

NH3

Question 29

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

Answer 29

Acid

Question 30

True or False: Bases have a pH greater than 7.

Answer 30

True

Question 31

Which type of bond is the strongest?

Answer 31

Covalent bond

Question 32

What is the primary characteristic of alkali metals?

Answer 32

They are highly reactive.

Question 33

What is the chemical name for H2SO4?

Answer 33

Sulfuric acid

Question 34

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

Answer 34

Sublimation

Question 35

What is the term for the number of atoms in a molecule?

Answer 35

Molecular formula

Question 36

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

Answer 36

False

Question 37

What is the term for a solution that resists changes in pH?

Answer 37

Buffer

Question 38

What is the main difference between an element and a compound?

Answer 38

An element is a pure substance, while a compound is made of two or more elements chemically bonded.

Question 39

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

Answer 39

C2H5OH

Question 40

What type of reaction occurs when two or more substances combine to form a new compound?

Answer 40

Synthesis reaction

Question 41

Which gas is produced during cellular respiration?

Answer 41

Carbon dioxide

Question 42

What is the term for the attractive force between molecules?

Answer 42

Intermolecular force

Question 43

True or False: Metals typically form anions.

Answer 43

False

Question 44

What is the term for the ability of a substance to dissolve in water?

Answer 44

Solubility

Question 45

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

Answer 45

NaHCO3

Question 46

What is the main component of the cell membrane?

Answer 46

Phospholipids

Question 47

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

Answer 47

Freezing

Question 48

Which element is found in all organic molecules?

Answer 48

Carbon