Quiz about Introduction to (Bio)Chemistry Quiz

Question 1

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

Accepted Answer

Atom

Answer

Molecule

Answer

Compound

Answer

Ion

Question 2

Which subatomic particle has a positive charge?

Accepted Answer

Proton

Answer

Electron

Answer

Neutron

Answer

Ion

Question 3

What is a substance made of two or more elements chemically combined in a fixed ratio?

Accepted Answer

Compound

Answer

Element

Answer

Ion

Answer

Molecule

Question 4

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

Accepted Answer

Covalent Bond

Answer

Ionic Bond

Answer

Hydrogen Bond

Answer

van der Waals forces

Question 5

What is the term for a charged atom or molecule?

Accepted Answer

Ion

Answer

Isotope

Answer

Element

Answer

Compound

Question 6

What are the three subatomic particles of an atom?

Accepted Answer

Protons, Neutrons, Electrons

Answer

Atoms, Molecules, Compounds

Answer

Ions, Isotopes, Elements

Answer

Solids, Liquids, Gases

Question 7

How are all of the isotopes of an element similar?

Accepted Answer

They have the same number of protons.

Answer

They have different chemical properties.

Answer

They have different numbers of electrons.

Answer

They have different atomic numbers.

Question 8

How can radioactive isotopes be used to date fossils?

Accepted Answer

By measuring the decay rate of isotopes.

Answer

By comparing the size of isotopes.

Answer

By observing the color change in isotopes.

Answer

By counting the number of isotopes.

Question 9

In what ways does a compound differ from its component elements?

Accepted Answer

A compound has different properties than its elements.

Answer

A compound is the same as its elements.

Answer

A compound is always a gas.

Answer

A compound is always a liquid.

Question 10

What are the main types of chemical bonds?

Accepted Answer

Ionic and Covalent

Answer

Metallic and Non-metallic

Answer

Solid and Liquid

Answer

Physical and Chemical

Question 11

What is the basic unit of matter, the fundamental unit of elements?

Accepted Answer

Atom

Answer

Molecule

Answer

Cell

Answer

Compound

Question 12

Where is the nucleus located in an atom?

Accepted Answer

At the center of the atom

Answer

On the outer shell

Answer

Between the electrons

Answer

Outside the atom

Question 13

Which subatomic particle has a positive charge?

Accepted Answer

Proton

Answer

Neutron

Answer

Electron

Answer

Photon

Question 14

What is the charge of a neutron?

Accepted Answer

Neutral

Answer

Positive

Answer

Negative

Answer

Double positive

Question 15

Where are electrons located in an atom?

Accepted Answer

Outside of the nucleus

Answer

Inside the nucleus

Answer

Between protons and neutrons

Answer

In the center of the nucleus

Question 16

Diagram of a carbon atom showing protons, neutrons, and electrons.

Accepted Answer

Diagram of a carbon atom showing protons, neutrons, and electrons.

Answer

Diagram of a nitrogen atom showing protons, neutrons, and electrons.

Answer

Diagram of an oxygen atom showing protons, neutrons, and electrons.

Answer

Diagram of a hydrogen atom showing protons, neutrons, and electrons.

Question 17

What provides the identity to an atom?

Accepted Answer

Protons

Answer

Neutrons

Answer

Electrons

Answer

Valence electrons

Question 18

What role do neutrons play in the nucleus?

Accepted Answer

They stabilize the nucleus by reducing repulsion between protons

Answer

They provide a positive charge

Answer

They determine the atom's chemical reactivity

Answer

They hold electrons in orbitals

Question 19

What determines an atom's chemical reactivity?

Accepted Answer

Valence electrons

Answer

Protons

Answer

Neutrons

Answer

Atomic number

Question 20

What is an element?

Accepted Answer

A pure substance that consists of entirely one type of atom

Answer

A substance made of different types of atoms

Answer

A mixture of various compounds

Answer

A form of matter with no definite shape

Question 21

What defines an isotope?

Accepted Answer

Forms of a single element with the same number of protons but different numbers of neutrons

Answer

Different elements with the same number of protons

Answer

Forms of a single element with the same number of neutrons

Answer

Different elements with different numbers of electrons

Question 22

Which of the following remains the same in isotopes of an element?

Accepted Answer

Type of element and chemical reactivity

Answer

Mass and nuclear stability

Answer

Number of neutrons and electrons

Answer

Physical state and color

Question 23

How is the periodic table organized?

Accepted Answer

By horizontal rows and vertical columns

Answer

By color and shape

Answer

By atomic number and mass

Answer

By alphabetical order

Question 24

What do elements in the same column of the periodic table share?

Accepted Answer

The same number of valence electrons

Answer

The same atomic number

Answer

The same atomic mass

Answer

The same color

Question 25

What is the periodic table organized by?

Accepted Answer

Atomic number

Answer

Atomic mass

Answer

Alphabetical order

Answer

Color

Question 26

What is the charge of a cation?

Accepted Answer

Positive

Answer

Negative

Answer

Neutral

Answer

No charge

Question 27

What happens to electrons in anions?

Accepted Answer

Electrons are gained

Answer

Electrons are lost

Answer

Electrons remain the same

Answer

Electrons are shared

Question 28

What defines an ion?

Accepted Answer

Unequal number of protons and electrons

Answer

Equal number of protons and electrons

Answer

Only protons present

Answer

Only electrons present

Question 29

Why do ions form?

Accepted Answer

To increase the overall stability of an atom's electron configuration.

Answer

To decrease the overall stability of an atom's electron configuration.

Answer

To make atoms unstable.

Answer

To reduce the number of electrons in an atom.

Question 30

What is the Octet Rule?

Accepted Answer

The tendency of atoms to prefer to have eight electrons in the outermost shell.

Answer

The tendency of atoms to have six electrons in the outermost shell.

Answer

The tendency of atoms to have ten electrons in the outermost shell.

Answer

The tendency of atoms to have four electrons in the outermost shell.

Question 31

What charge do cations have?

Accepted Answer

Positive charge

Answer

Negative charge

Answer

Neutral charge

Answer

No charge

Question 32

What happens to electrons when anions are formed?

Accepted Answer

Electrons are gained

Answer

Electrons are lost

Answer

Electrons remain unchanged

Answer

Electrons are shared

Question 33

What is the charge of ions commonly formed by elements in Group 1 of the periodic table?

Accepted Answer

+ charge

Answer

2+ charge

Answer

3- charge

Answer

- charge

Question 34

Which group in the periodic table typically forms ions with a 2+ charge?

Accepted Answer

Group 2

Answer

Group 1

Answer

Group 15

Answer

Group 17

Question 35

What does the atomic number represent in an element?

Accepted Answer

Number of protons

Answer

Number of electrons

Answer

Number of neutrons

Answer

Mass number

Question 36

How can you find the atomic number using the periodic table?

Accepted Answer

By looking at the top of each box

Answer

By looking at the bottom of each box

Answer

By looking at the middle of each box

Answer

By looking at the side of each box

Question 37

What is the atomic number of Helium (He) as shown in the image?

Accepted Answer

2

Answer

4

Answer

24

Answer

12

Question 38

How do you find the mass number of an element using the periodic table?

Accepted Answer

Take the average atomic mass under the symbol and round to the nearest whole number.

Answer

Use the atomic number and multiply by two.

Answer

Subtract the charge from the atomic number.

Answer

Add the atomic number and charge.

Question 39

What is the mass number of the isotope C-13?

Accepted Answer

13

Answer

6

Answer

12

Answer

14

Question 40

What is the atomic number of an element with 3 protons?

Accepted Answer

3

Answer

1

Answer

2

Answer

4

Question 41

How many electrons does an element with an atomic number of 3 have?

Accepted Answer

2

Answer

1

Answer

3

Answer

4

Question 42

What is a characteristic of radioactive isotopes?

Accepted Answer

They have unstable nuclei and break down at a constant rate.

Answer

They are stable and do not change over time.

Answer

They are stable and break down at different rates.

Answer

They have stable nuclei and break down at a constant rate.

Question 43

Do all radioactive isotopes break down at the same rate?

Accepted Answer

No, they break down at different rates.

Answer

Yes, they all break down at the same rate.

Answer

Yes, they break down at a constant rate.

Answer

No, they do not break down at all.

Question 44

What is the definition of half-life?

Accepted Answer

The time it takes for half of the mass of a radioactive isotope to breakdown.

Answer

The time it takes for a radioactive isotope to completely decay.

Answer

The time it takes for a radioactive isotope to double in mass.

Answer

The time it takes for a radioactive isotope to become stable.

Question 45

If there is a 500 gram sample of a substance with a half-life of 11.25 minutes, how long will it take for the sample to only have 7.8125 grams?

Accepted Answer

56.25 minutes

Answer

45 minutes

Answer

67.5 minutes

Answer

78.75 minutes

Question 46

What happens to atoms when they lose or gain electrons?

Accepted Answer

They become charged ions.

Answer

They become neutral atoms.

Answer

They become isotopes.

Answer

They become molecules.

Question 47

Why do ions form bonds?

Accepted Answer

To cancel out charges and achieve stability.

Answer

To increase their mass.

Answer

To become radioactive.

Answer

To change their atomic number.

Question 48

What type of ion will a positive metal cation bond with?

Accepted Answer

A negative nonmetal anion.

Answer

Another positive metal cation.

Answer

A neutral atom.

Answer

A positive nonmetal anion.

Question 49

What is the main purpose of atoms sharing valence electrons in covalent bonding?

Accepted Answer

To reach a full outer shell

Answer

To create ions

Answer

To increase atomic mass

Answer

To decrease energy levels

Question 50

How many shared pairs are created in a single covalent bond?

Accepted Answer

One

Answer

Two

Answer

Three

Answer

Four

Question 51

What type of bond is formed when there are two shared pairs between the same atoms?

Accepted Answer

Double bond

Answer

Single bond

Answer

Triple bond

Answer

Ionic bond

Question 52

Between which types of elements are covalent bonds typically formed?

Accepted Answer

Nonmetals

Answer

Metals and nonmetals

Answer

Metals

Answer

Noble gases

Question 53

What is the role of valence electrons in chemical bonding?

Accepted Answer

They are involved in forming chemical bonds.

Answer

They are responsible for the charge of the nucleus.

Answer

They determine the atomic mass.

Answer

They define the atomic number.

Question 54

Which subatomic particle is responsible for the chemical properties of an element?

Accepted Answer

Electrons

Answer

Protons

Answer

Nucleus

Answer

Neutrons

Question 55

What happens to the atomic number when an atom becomes an ion?

Accepted Answer

It remains the same.

Answer

It doubles.

Answer

It decreases.

Answer

It increases.

Question 56

What is the charge of an anion?

Accepted Answer

Negative

Answer

Positive

Answer

No charge

Answer

Neutral

Question 57

Which subatomic particle is found in the nucleus and has no charge?

Accepted Answer

Neutron

Answer

Electron

Answer

Proton

Answer

Photon

Introduction to (Bio)Chemistry Quiz

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