Homework Practice

Printable assignment

Final Assessment: Physical and Chemical Changes

Section A: Core Classification

Question 1mcq

Which question best helps decide whether a change is chemical?

A.Has a new substance with new properties formed?

B.Did the object move from one place to another?

C.Did the object become smaller only?

D.Was the object touched by a student?

Question 2mcq

Which pair contains only physical changes?

A.Burning paper and rusting iron

B.Melting ice and tearing paper

C.Cooking rice and curdling milk

D.Burning magnesium and baking a cake

Question 3mcq

Which sign is commonly linked with a chemical change?

A.Change in position of a book

B.Folding a cloth

C.Formation of gas after mixing substances

D.Sharpening a pencil

Question 4mcq

Which condition would most reduce rusting of an iron nail?

A.Keeping it wet in open air

B.Adding salt water regularly

C.Scratching off paint and leaving it outside

D.Keeping it dry and away from air/moisture

Question 5mcq

Crystallisation separates crystals because:

A.a dissolved substance can come out of solution as pure crystals

B.all substances burn when cooled

C.water changes into iron

D.indicators form crystals only in acids

Question 6mcq

Which change is chemical?

A.Cutting thread

B.Burning a candle wick

C.Melting butter

D.Inflating a balloon

Section B: Evidence and Rusting

Question 7mcq

Which statement is most accurate?

A.Every irreversible change is chemical.

B.Every physical change is reversible in daily life.

C.A change can be irreversible and still mainly physical if no new substance forms.

D.Reversibility is the only science test needed.

Question 8mcq

A student heats sugar strongly. It turns black and gives a burnt smell. What is the best conclusion?

A.Only a physical change occurred because sugar is still sweet.

B.No change occurred because heating is not a change.

C.It is crystallisation because it turned black.

D.A chemical change has occurred because new substances are formed.

Question 9mcq

Which example is both a change in appearance and a chemical change?

A.Iron nail developing reddish-brown rust

B.Paper folded into a fan

C.Ice becoming water

D.Clay shaped into a pot before firing

Question 10mcq

Stretching a rubber band is usually a physical change because:

A.it produces rust

B.its shape changes but no new substance forms

C.it forms carbon dioxide

D.it becomes cooked food

Question 11mcq

During a reaction, a solid appears when two clear solutions are mixed. This solid is called a precipitate. What does this usually indicate?

A.Only evaporation happened.

B.Only folding happened.

C.A chemical change may have occurred.

D.No particles are present.

Question 12mcq

Why does an iron object rust faster near the sea?

A.Sea air contains no oxygen.

B.Salt turns iron into plastic.

C.Dry sand prevents all reactions.

D.Salt and moisture in sea air speed up rusting.

Section C: Processes and Applications

Question 13mcq

Which observation suggests crystallisation has happened?

A.Shiny, regular-shaped solid particles appear from a solution.

B.A paper is cut into squares.

C.An iron nail turns brown.

D.A matchstick burns completely.

Question 14mcq

Why is burning paper not just a physical change?

A.The paper only becomes smaller pieces.

B.Ash, smoke and gases with new properties are formed.

C.The paper remains exactly paper.

D.No heat or light is involved.

Question 15mcq

Which row is correctly matched?

A.Melting ice — chemical; rusting iron — physical

B.Cutting paper — chemical; burning paper — physical

C.Melting ice — physical; rusting iron — chemical

D.Dissolving sugar — chemical; cooking food — physical

Question 16mcq

Case: A silver-coloured strip burns with bright white light and leaves a white powder. Which explanation is best?

A.Only the strip changed position.

B.The strip became colder and unchanged.

C.This proves all metals are indicators.

D.A chemical change formed a new white substance.

Question 17mcq

Which change is easiest to misclassify if a student uses only “reversible or irreversible”?

A.Breaking a glass tumbler

B.Burning paper into ash

C.Rusting a nail

D.Milk turning into curd

Question 18mcq

Which physical change involves change in state?

A.Rusting of iron

B.Evaporation of water

C.Burning of wood

D.Curdling of milk

Section D: Misconceptions and Cases

Question 19mcq

Which evidence is weakest by itself for proving chemical change?

A.Gas formation

B.Formation of a new solid precipitate

C.Change in size only

D.Heat and light during burning

Question 20mcq

Galvanisation protects iron by:

A.mixing iron with sugar

B.making iron acidic

C.turning rust back into pure iron automatically

D.coating iron with zinc to prevent contact with air and moisture

Question 21mcq

Why should the solution be filtered before crystallisation if insoluble impurities are present?

A.To remove insoluble dirt so purer crystals can form.

B.To convert all impurities into gas.

C.To make rust faster.

D.To make the solution strongly basic.

Question 22mcq

Which everyday change is most similar to burning in terms of new substance formation?

A.Folding a napkin

B.Cooking chapati on a hot tawa

C.Breaking chalk into two pieces

D.Melting an ice cube

Question 23mcq

Assertion: Dissolving salt in water is a physical change. Reason: The salt can be recovered by evaporating water. Choose the best answer.

A.Both are true, but the reason does not support the assertion.

B.Assertion is true, but reason is false.

C.Both assertion and reason are true, and the reason supports the assertion.

D.Assertion is false, but reason is true.

Question 24mcq

A student classifies boiling water as chemical because “bubbles are seen.” What is the best correction?

A.All bubbles always mean chemical change.

B.Boiling water forms rust.

C.Water vapour is a new metal.

D.Bubbles in boiling are water vapour, not necessarily a new substance.