Question 1

Which of the following is an example of a heterogeneous mixture?

Accepted Answer

Salad

Answer

Air

Answer

Salt solution

Answer

Sugar water

Question 2

Which of the following is a compound?

Accepted Answer

Water

Answer

Copper

Answer

Brass

Answer

Salt water

Question 3

Which description best applies to a homogeneous mixture?

Accepted Answer

The composition is uniform throughout.

Answer

Components are chemically bonded.

Answer

Elements are present in equal parts.

Answer

It contains distinct regions or phases.

Question 4

What distinguishes an element from a compound?

Accepted Answer

An element consists of only one type of atom.

Answer

A compound has a fixed composition and structure.

Answer

A compound cannot be broken down into simpler substances.

Answer

An element contains a mixture of different atoms.

Question 5

Which of the following is a pure substance?

Accepted Answer

Oxygen gas

Answer

Soda

Answer

Granola bar

Answer

Fruit salad

Question 6

How would you classify milk?

Accepted Answer

Homogeneous mixture

Answer

Compound

Answer

Heterogeneous mixture

Answer

Element

Question 7

What defines a heterogeneous mixture?

Accepted Answer

The components are not evenly distributed.

Answer

Its components are chemically bonded.

Answer

It consists of one type of atom.

Answer

It has a fixed ratio of elements.

Question 8

Which of the following is an element?

Accepted Answer

Iron

Answer

Bronze

Answer

Table sugar

Answer

Water

Question 9

Which of the following is an example of a compound?

Accepted Answer

Carbon dioxide

Answer

Sand

Answer

Bronze

Answer

Oxygen

Question 10

Which description best fits a homogeneous mixture?

Accepted Answer

It has the same composition throughout.

Answer

It can be separated by physical methods.

Answer

It is composed of only one type of element.

Answer

Its components are easily distinguishable.

Question 11

What property of water allows insects like water striders to walk on its surface without sinking?

Accepted Answer

Surface tension

Answer

Cohesion

Answer

Density

Answer

Adhesion

Question 12

Which property of water is primarily responsible for the upward transport of water in plants?

Accepted Answer

Cohesion

Answer

Adhesion

Answer

Surface tension

Answer

Evaporation

Question 13

What is the property of water that causes it to form droplets when placed on a smooth surface?

Accepted Answer

Cohesion

Answer

Surface tension

Answer

Adhesion

Answer

Evaporation

Question 14

Which property of water allows it to climb up thin tubes against the force of gravity in plants?

Accepted Answer

Adhesion

Answer

Cohesion

Answer

Surface tension

Answer

Density

Question 15

Which property of water is involved when a paper towel absorbs a spill?

Accepted Answer

Adhesion

Answer

Cohesion

Answer

Surface tension

Answer

Viscosity

Question 16

What allows water droplets to remain nearly spherical on a waxed car surface?

Accepted Answer

Surface tension

Answer

Cohesion

Answer

Density

Answer

Adhesion

Question 17

Which phenomenon is most directly caused by the cohesive properties of water molecules?

Accepted Answer

Formation of water droplets

Answer

Insects walking on water

Answer

Water flowing through plant stems

Answer

Ice floating on water

Question 18

What property allows a small metal needle to float on the surface of water without sinking?

Accepted Answer

Surface tension

Answer

Adhesion

Answer

Buoyancy

Answer

Cohesion

Question 19

Which property of water helps it move upward through a plant's xylem tubes?

Accepted Answer

Cohesion and adhesion

Answer

Cohesion only

Answer

Surface tension only

Answer

Adhesion only

Question 20

When you pour water carefully onto a penny, what property of water allows the rounded dome shape to form on top?

Accepted Answer

Surface tension

Answer

Cohesion

Answer

Adhesion

Answer

Capillary action

Question 21

Which property of water allows small insects, such as water striders, to walk on its surface without sinking?

Accepted Answer

Surface tension

Answer

Adhesion

Answer

Density

Answer

Cohesion

Question 22

What property of water explains why it can rise through the narrow tubes in plants against gravity?

Accepted Answer

Adhesion

Answer

Cohesion

Answer

Buoyancy

Answer

Surface tension

Question 23

What causes water to form droplets on a surface rather than spreading out evenly?

Accepted Answer

Cohesion

Answer

Surface tension

Answer

Absorption

Answer

Adhesion

Question 24

Which property of water enables trees to transport water from their roots to their leaves?

Accepted Answer

Cohesion and adhesion

Answer

Only adhesion

Answer

Cohesion and evaporation

Answer

Surface tension alone

Question 25

Why can a paperclip float on the surface of water despite being made of metal?

Accepted Answer

Surface tension

Answer

Cohesion

Answer

Buoyancy

Answer

Adhesion

Question 26

Which example is true of the characteristic property that distinguishes acids from bases based on their interaction with Universal litmus paper?

Accepted Answer

Acids turn red - light green.

Answer

Neutral substances can be any color

Answer

Bases have no effect on litmus paper.

Answer

Bases turn red to green.

Answer

Acids turn blue.

Question 27

Which of the following statements correctly compares the properties of acids and bases?

Accepted Answer

Acids have a pH less than 7, while bases have a pH greater than 7.

Answer

Both acids and bases have a pH of 7.

Answer

Bases are sour and acids are bitter.

Answer

Acids turn litmus paper blue, while bases turn it red.

Question 28

Which property is typical of bases and not acids in a chemical solution?

Accepted Answer

Bases feel slippery to the touch.

Answer

Bases taste sour.

Answer

Bases release hydrogen ions in water.

Answer

Bases have a pH lower than 7.

Question 29

What happens to the pH of water when an acid is added to it?

Accepted Answer

The pH decreases as the solution becomes more acidic.

Answer

The pH fluctuates without a noticeable trend.

Answer

The pH increases as the solution becomes more basic.

Answer

The pH remains the same because water is neutral.

Question 30

Which of the following is a true statement about the taste of acids and bases?

Accepted Answer

Acids typically have a sour taste, while bases are bitter.

Answer

Acids have a bitter taste, and bases are tasteless.

Answer

Both acids and bases have a sweet taste.

Answer

Bases have a sour taste, while acids are salty.

Question 31

Which of the following correctly describes a reaction between an acid and a base?

Accepted Answer

Acids and bases react to form water and a salt.

Answer

Acids and bases do not react with each other.

Answer

Acids and bases react to form an acid and hydrogen gas.

Answer

Acids and bases react to produce carbon dioxide and water.

Question 32

What effect does a base have on the pH level when dissolved in water?

Accepted Answer

It increases the pH level, making the solution more basic.

Answer

It causes no change in the pH level.

Answer

It decreases the pH level, making the solution more acidic.

Answer

It keeps the pH level neutral, at 7.

Question 33

How does adding a base to a solution affect the concentration of hydrogen ions (

H^+

)?

Accepted Answer

The concentration of hydrogen ions decreases.

Answer

The concentration of hydrogen ions increases.

Answer

The concentration of hydrogen ions remains the same.

Answer

The concentration of hydrogen ions fluctuates randomly.

Question 34

What happens to universal litmus paper when it is dipped into an acidic solution?

Accepted Answer

The litmus paper turns red.

Answer

Both red and blue litmus paper remain unchanged.

Answer

Blue litmus paper stays blue.

Answer

Red litmus paper turns blue.

Question 35

What is the expected pH range of an acidic solution?

Accepted Answer

The pH is less than 7.

Answer

The pH is exactly 7.

Answer

The pH is between 8 and 14.

Answer

The pH is greater than 7.

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