Question 1

Which of the following indicates a physical change has occurred?

Accepted Answer

The substance changes its state of matter

Answer

A new substance is formed

Answer

There is a color change

Answer

There is a temperature change

Question 2

What type of change is observed when baking a cake?

Accepted Answer

Chemical change

Answer

Phase change

Answer

Physical change

Answer

Mechanical change

Question 3

Which of the following is an example of a physical property?

Accepted Answer

Boiling point

Answer

Reactivity with acid

Answer

Flammability

Answer

Oxidation state

Question 4

What happens to the temperature of a substance during a phase change?

Accepted Answer

It remains constant

Answer

It increases

Answer

It fluctuates

Answer

It decreases

Question 5

Which property measures how much mass is contained in a given volume?

Accepted Answer

Density

Answer

Mass

Answer

Weight

Answer

Volume

Question 6

Which of the following is a characteristic of a chemical change?

Accepted Answer

Production of gas

Answer

Change in color

Answer

Change in size

Answer

Dissolution in water

Question 7

What property describes the ability of a substance to be hammered or rolled into thin sheets?

Accepted Answer

Malleability

Answer

Ductility

Answer

Viscosity

Answer

Brittleness

Question 8

Which of the following is an example of a physical change?

Accepted Answer

Melting ice

Answer

Digesting food

Answer

Burning wood

Answer

Rusting iron

Question 9

Which of the following is a chemical property?

Accepted Answer

Ability to react with oxygen

Answer

Density

Answer

Color

Answer

Mass

Question 10

Which of the following is a physical property of water?

Accepted Answer

Boiling point

Answer

Flammability

Answer

Rusting

Answer

Reactivity with sodium

Question 11

Which of the following is a characteristic of a physical change?

Accepted Answer

Change in state

Answer

Formation of a gas

Answer

Change in color

Answer

Release of heat

Question 12

Which of the following substances is most likely to undergo a chemical change?

Accepted Answer

Vinegar reacting with baking soda

Answer

Sugar dissolving in water

Answer

Ice melting

Answer

Water boiling

Question 13

Which of the following is an example of a physical property?

Accepted Answer

Melting point

Answer

Ability to tarnish

Answer

Flammability

Answer

Ability to rust

Question 14

Which of the following changes is a chemical change?

Accepted Answer

Milk souring

Answer

Ice forming

Answer

Sugar dissolving

Answer

Water freezing

Question 15

Which of the following is an indication of a chemical reaction?

Accepted Answer

Change in temperature

Answer

Change in mass

Answer

Change in shape

Answer

Change in size

Question 16

Which of the following is a sign that a chemical change has occurred?

Accepted Answer

Formation of bubbles

Answer

Change in color without a reaction

Answer

Change in volume

Answer

Dissolution in water

Question 17

What is one common sign of a chemical change?

Accepted Answer

Formation of a gas

Answer

Change in color

Answer

Formation of a precipitate

Answer

Change in temperature

Question 18

Which of the following is NOT a sign of a chemical change?

Accepted Answer

Melting of ice

Answer

Color change

Answer

Formation of a solid

Answer

Production of light

Question 19

What is a sign that a chemical change has occurred?

Accepted Answer

Color change

Answer

Evaporation of alcohol

Answer

Freezing of water

Answer

Dissolving sugar in water

Question 20

Which of the following is a sign of a chemical change?

Accepted Answer

Formation of a precipitate

Answer

Dissolving salt in water

Answer

Changing the state of matter

Answer

Mixing oil and water

Question 21

What happens during a chemical change?

Accepted Answer

New substances are formed

Answer

Temperature stays the same

Answer

Only physical properties change

Answer

The mass is lost

Question 22

Which of the following is an indicator of a chemical change?

Accepted Answer

Release of energy in the form of heat or light

Answer

Increase in volume

Answer

Change in shape

Answer

Dissolution in water

Question 23

Which of the following occurrences suggests a chemical change has taken place?

Accepted Answer

Production of gas bubbles

Answer

Metal being hammered

Answer

Sugar dissolving in coffee

Answer

Water freezing into ice

Question 24

What does the law of conservation of mass state?

Accepted Answer

Mass is neither created nor destroyed in a chemical reaction

Answer

Mass can be created during a reaction

Answer

Mass is only destroyed in a chemical reaction

Answer

Mass changes into energy during a reaction

Question 25

Which of the following scenarios demonstrates the law of conservation of mass?

Accepted Answer

A closed system where water evaporates and forms clouds

Answer

A fire burning wood and leaving ashes

Answer

Mixing vinegar and baking soda, causing bubbling

Answer

Dissolving sugar in water, which disappears

Question 26

What happens to the mass of reactants during a chemical reaction according to the law of conservation of mass?

Accepted Answer

The mass of reactants equals the mass of products

Answer

The mass of reactants decreases

Answer

The mass of reactants disappears

Answer

The mass of products can be greater than reactants

Question 27

In a closed container, if you burn a candle, what happens to the mass of the candle and the released gases?

Accepted Answer

The total mass remains the same before and after burning

Answer

The mass decreases as the candle burns

Answer

The mass increases due to heat

Answer

The mass is lost as smoke disappears

Question 28

What is one way to verify the law of conservation of mass in a chemical reaction?

Accepted Answer

Measuring the mass of reactants before the reaction and products after

Answer

Observing the color change during the reaction

Answer

Checking the temperature increase of the mixture

Answer

Counting the number of bubbles formed

Question 29

Which statement correctly summarizes the law of conservation of mass?

Accepted Answer

The total mass of a closed system remains constant

Answer

Some reactions create mass

Answer

Mass can be lost in open systems

Answer

Mass doubles during chemical changes

Question 30

When mixing vinegar and baking soda, what happens to the total mass before and after the reaction?

Accepted Answer

The total mass remains the same

Answer

The mass changes depending on temperature

Answer

The mass decreases when the bubbles form

Answer

The mass increases due to new substances

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