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Chemical Reactions and Properties Quiz

Total questions: 65

Worksheet time: 33mins

Name
Class
Date
1.

How is the law of conservation of mass shown in a chemical reaction?

a)

Energy is absorbed by reactants

b)

New atoms are created

c)

The total mass of reactants equals products

d)

Products always weigh more

2.

Why must chemical equations be balanced?

a)

To show reaction speed

b)

To follow atomic structure rules

c)

Because mass is conserved

d)

To release energy

3.

How does energy affect chemical reactions?

a)

It changes atomic mass

b)

It controls bond breaking and forming

c)

It changes element identity

d)

It eliminates reactants

4.

What happens to substances when they dissolve in water?

a)

They disappear

b)

They chemically react

c)

Their particles spread evenly

d)

They change elements

5.

How are nuclear reactions different from chemical reactions?

a)

Nuclear reactions involve electrons

b)

Chemical reactions release more energy

c)

Nuclear reactions change the nucleus

d)

Chemical reactions form new elements

6.

Why do atoms form bonds?

a)

To gain mass

b)

To become more stable

c)

To increase energy

d)

To release protons

7.

A chemical equation shows:

a)

Only reactants

b)

Only products

c)

Reactants changing into products

d)

Energy only

8.

Which is a diatomic molecule?

a)

CO₂

b)

H₂

c)

NaCl

d)

H₂O

9.

A precipitate forms when:

a)

A gas dissolves

b)

A solid forms from solution

c)

A liquid evaporates

d)

Energy is released

10.

In the reaction C₂H₄ + 3O₂ → 2CO₂ + 2H₂O, which are the reactants?

a)

CO₂ and H₂O

b)

C₂H₄ and O₂

c)

CO₂ only

d)

H₂O only

11.

In the same equation, which numbers are coefficients?

a)

Subscripts only

b)

2 and 4

c)

2 and 3

d)

C and O

12.

Which balanced equation is correct?

a)

H₂ + O₂ → H₂O

b)

2H₂ + O₂ → 2H₂O

c)

H₂ + O₂ → 2H₂O

d)

4H + O₂ → H₂O

13.

Which is the balanced form of Mg + HCl → H₂ + MgCl₂?

a)

Mg + HCl → H₂ + MgCl₂

b)

Mg + 2HCl → H₂ + MgCl₂

c)

2Mg + HCl → H₂ + MgCl₂

d)

Mg + H₂Cl → MgCl₂

14.

Which reaction type forms a single compound from simpler substances?

a)

Decomposition

b)

Combustion

c)

Synthesis

d)

Replacement

15.

AB → A + B is an example of:

a)

Synthesis

b)

Single replacement

c)

Decomposition

d)

Combustion

16.

A + BC → AC + B represents:

a)

Double replacement

b)

Single replacement

c)

Synthesis

d)

Combustion

17.

AB + CD → AD + BC describes:

a)

Combustion

b)

Synthesis

c)

Single replacement

d)

Double replacement

18.

A reaction that produces CO₂, H₂O, heat, and light is:

a)

Decomposition

b)

Nuclear

c)

Combustion

d)

Synthesis

19.

Activation energy is:

a)

Energy released

b)

Energy stored

c)

Energy required to start a reaction

d)

Energy lost

20.

Chloroplasts are responsible for:

a)

Cellular respiration

b)

Protein synthesis

c)

Photosynthesis

d)

Digestion

21.

Glucose is important because it:

a)

Stores genetic information

b)

Is a waste product

c)

Stores and transports energy

d)

Breaks bonds

22.

Endothermic reactions:

a)

Release heat

b)

Lower activation energy

c)

Absorb more energy than they release

d)

Always burn

23.

Exothermic reactions:

a)

Absorb heat

b)

Release more energy than absorbed

c)

Stop reactions

d)

Decrease temperature

24.

On an energy diagram, activation energy is shown as:

a)

The lowest point

b)

The energy difference between products

c)

The energy barrier to reaction

d)

The final energy

25.

Increasing temperature affects reaction rate by:

a)

Lowering collisions

b)

Slowing particles

c)

Increasing collision energy

d)

Changing mass

26.

A catalyst speeds reactions by:

a)

Increasing temperature

b)

Lowering activation energy

c)

Being consumed

d)

Changing products

27.

Photosynthesis and respiration are similar because both:

a)

Require sunlight

b)

Use oxygen

c)

Are chemical reactions

d)

Produce glucose

28.

Which equation represents photosynthesis?

a)

Glucose + O₂ → CO₂ + H₂O

b)

CO₂ + H₂O + light → glucose + O₂

c)

CO₂ + O₂ → glucose

d)

ATP → glucose

29.

Cellular respiration produces:

a)

Glucose

b)

Oxygen

c)

ATP

d)

Chlorophyll

30.

A solution is:

a)

A heterogeneous mixture

b)

A pure substance

c)

A homogeneous mixture

d)

A compound

31.

Solubility refers to:

a)

Speed of dissolving

b)

Maximum solute dissolved

c)

Solution color

d)

Density

32.

Neutralization produces:

a)

Acid only

b)

Base only

c)

Water and salt

d)

Gas

33.

In a solution, the solute is:

a)

The dissolving substance

b)

The substance dissolved

c)

Always water

d)

Always solid

34.

Stirring increases dissolving by:

a)

Increasing mass

b)

Increasing particle contact

c)

Changing polarity

d)

Forming bonds

35.

Solutions differ from solute and solvent because they:

a)

Keep original properties

b)

Gain new properties

c)

Become solids

d)

Change elements

36.

Solubility is affected by all EXCEPT:

a)

Temperature

b)

Pressure

c)

Polarity

d)

Volume

37.

A saturated solution:

a)

Can dissolve more solute

b)

Has maximum solute dissolved

c)

Is unstable

d)

Crystallizes instantly

38.

A supersaturated solution is:

a)

Stable

b)

Below maximum solute

c)

Above normal solubility

d)

Always gaseous

39.

pH measures:

a)

Density

b)

Temperature

c)

Acidity or basicity

d)

Solubility

40.

Higher H₃O⁺ concentration means:

a)

Higher pH

b)

Lower pH

c)

Neutral solution

d)

Basic solution

41.

Acids typically have:

a)

pH above 7

b)

OH⁻ ions

c)

pH below 7

d)

Blue litmus

42.

Bases produce:

a)

H₃O⁺

b)

Electrons

c)

OH⁻ ions

d)

Neutrons

43.

In a neutralization reaction, pH moves toward:

a)

1

b)

14

c)

7

d)

0

44.

Half-life refers to:

a)

Total decay time

b)

Energy released

c)

Time for half to decay

d)

Reaction speed

45.

Radiation involves:

a)

Electron transfer

b)

Energy emitted from nuclei

c)

Chemical bonds

d)

Temperature change

46.

Transmutation means:

a)

Bond rearrangement

b)

Electron movement

c)

One element becoming another

d)

Phase change

47.

A natural radiation source is:

a)

Microwave ovens

b)

Radon gas

c)

Batteries

d)

Plastics

48.

Carbon-14 dating is used to:

a)

Measure temperature

b)

Determine fossil age

c)

Detect metals

d)

Produce energy

49.

Smoke alarms use radiation from:

a)

Uranium

b)

Carbon-12

c)

Americium-241

d)

Oxygen

50.

Nuclear reactions release more energy because they involve:

a)

Electrons

b)

Nuclei

c)

Molecules

d)

Bonds

51.

Alpha particles consist of:

a)

Electrons

b)

Protons only

c)

2 protons and 2 neutrons

d)

Energy waves

52.

52. Gamma radiation:

a)

Is stopped by paper

b)

Is highly penetrating

c)

Has charge

d)

Has mass

53.

After 8 years, a 1-gram sample with 2-year half-life becomes:

a)

0.5 g

b)

0.0625 g

c)

0.125 g

d)

0.25 g

54.

Nuclear fission involves:

a)

Chemical change

b)

Electron loss

c)

Splitting large nuclei

d)

Combining nuclei

55.

Fusion occurs in:

a)

Batteries

b)

The Sun

c)

Earth’s core

d)

Nuclear reactors

56.

Organic compounds always contain:

a)

Metals

b)

Carbon bonded to hydrogen

c)

Nitrogen

d)

Oxygen

57.

An alkane is:

a)

Polymer

b)

Saturated hydrocarbon

c)

Has double bonds

d)

Unsaturated

58.

A polymer is made of:

a)

Ions

b)

Monomers

c)

Elements

d)

Atoms

59.

Diamond is hard because carbon atoms:

a)

Conduct electricity

b)

Are loosely bonded

c)

Bond to four others

d)

Form layers

60.

Graphite conducts electricity because:

a)

It is ionic

b)

It is dense

c)

It is liquid

d)

It has free electrons

61.

61. Fullerenes differ because they form:

a)

Ions

b)

Rigid lattices

c)

Hollow structures

d)

Flat sheets

62.

Isomers have the same:

a)

Function

b)

Chemical formula

c)

Properties

d)

Shape

63.

Alkenes and alkynes are:

a)

Polymers

b)

Unsaturated hydrocarbons

c)

Ionic

d)

Saturated

64.

Fossil fuels include:

a)

Uranium

b)

Biomass only

c)

Coal, oil, natural gas

d)

Solar and wind

65.

Proteins are macromolecules that:

a)

Insulate cells

b)

Perform cellular functions

c)

Provide quick energy

d)

Store genetic code

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