Chemistry Grade 7 Worksheet with Answers & Notes

States of Matter

Subtopic

States of Matter under Chemistry for Grade 7 IGCSE.

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1.
$Which of the following is NOT a state of matter?$
A. $Solid$
B. $Liquid$
C. $Energy$
D. $Gas$
2.
$What happens to the movement of gas particles when they are cooled?$
A. $They speed up$
B. $They slow down$
C. $They start to vibrate in place$
D. $0^\circ C$
3.
$In which state of matter are the forces of attraction between particles the weakest?$
A. $Solid$
B. $Liquid$
C. $Gas$
D. $They are the same in all$
4.
$What is the primary difference between boiling and evaporation?$
A. $Boiling only happens at the surface$
B. $Evaporation only happens at the boiling point$
C. $Boiling happens throughout the liquid at a specific temperature$
D. $They are exactly the same thing$
5.
$Two experiments on diffusion are performed at the same temperature as shown in the diagram. Why is the rate of diffusion in Process B much slower than in Process A?$
A. $Liquid particles are significantly larger than gas particles$
B. $Diffusion only occurs when particles are very far apart$
C. $Liquid particles are much closer together, which limits their movement$
D. $Gas particles have less kinetic energy than liquid particles at the same temperature$
6.
$The diagram shows a substance changing state from solid to liquid to gas. What happens to the average speed of the particles and the strength of the attractive forces between them during this sequence?$
A. $Average speed decreases and attractive forces become stronger$
B. $Average speed increases and attractive forces become weaker$
C. $Average speed increases and attractive forces become stronger$
D. $Average speed stays the same and attractive forces become weaker$
7.
$The flowchart represents the cooling of a sample of pure oxygen from a gas to a solid. At which stage is the substance existing as a mixture of both liquid and solid?$
A. $Stage 1$
B. $Stage 2$
C. $Stage 3$
D. $Stage 4$
8.
$O_2$
A. $H_2$
B. $He$
C. $CH_4$
D. $CO_2$
9.
$In a cooling curve for a gas being turned into a solid, there are two horizontal sections. What does the second (lower temperature) horizontal section represent?$
A. $Condensation$
B. $Freezing$
C. $Sublimation$
D. $Boiling$
10.
$If you are standing in a room and someone opens a bottle of perfume in the corner, you will eventually smell it. This is primarily due to:$
A. $The perfume particles being carried by air currents only.$
B. $The random movement and collision of perfume particles with air molecules (diffusion).$
C. $The perfume particles being attracted to your nose by magnetic forces.$
D. $The perfume particles expanding to fill the room because they are less dense than air.$

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The Particle Model

Subtopic

The Particle Model under Chemistry for Grade 7 IGCSE.

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1.
$The particle model states that all matter is made up of:$
A. $Tiny, invisible particles$
B. $Small bits of liquid$
C. $Solid cubes$
D. $Nothing but air$
2.
$When a substance changes from a liquid to a solid, its particles:$
A. $Move further apart$
B. $Stop vibrating$
C. $Get into a fixed, regular pattern$
D. $Gain more kinetic energy$
3.
$Which of the following describes the volume of a gas?$
A. $Fixed volume$
B. $No fixed volume$
C. $Volume only changes when it freezes$
D. $1$
4.
$A balloon is placed in a very cold freezer. What is likely to happen to the balloon's size?$
A. $It will get bigger because the particles expand$
B. $It will get smaller because the gas particles lose energy and move closer$
C. $It will stay the same size$
D. $It will pop because the pressure increases$
5.
$Two identical containers are filled with different gases at the same temperature. Container X contains Gas A, which has light particles. Container Y contains Gas B, which has heavy particles. If a tiny opening is made in each container, which statement correctly predicts the behavior of the gases?$
A. $Both gases will escape at the exact same rate because they are at the same temperature.$
B. $Gas A will escape more quickly because lighter particles move at higher average speeds than heavier particles.$
C. $Gas B will escape more quickly because heavier particles exert more force against the opening.$
D. $Neither gas will escape because gas particles are too small to be affected by the opening.$
6.
$50\text{ cm}^{3}$
A. $Mixing the two liquids causes the individual particles to lose a small amount of mass.$
B. $The particles of both liquids shrink in size when they are combined together.$
C. $The particles of ethanol are a different size and fit into the spaces between the water particles.$
D. $Some of the ethanol particles are destroyed when they come into contact with water.$
7.
$If you double the number of gas particles in a fixed-volume container at a constant temperature, what happens to the pressure?$
A. $It stays the same.$
B. $It is halved.$
C. $It doubles.$
D. $It becomes zero.$
8.
$KE$
A. $KE$
B. $KE$
C. $KE$
D. $KE$
9.
$Why does a smell spread faster in a hot room than in a cold room?$
A. $Hot air is thinner so there is less resistance.$
B. $The particles have more kinetic energy and move faster at higher temperatures.$
C. $The smell particles expand and fill the room.$
D. $Heat energy creates a vacuum that pulls the particles.$
10.
$The diagram shows a process where a substance changes state. Which statement is correct?$
A. $Energy is being absorbed to break bonds.$
B. $The particles are losing kinetic energy.$
C. $The density of the substance is increasing.$
D. $The temperature is dropping.$

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Properties of Materials

Subtopic

Properties of Materials under Chemistry for Grade 7 IGCSE.

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1.
$Which material has the property of being very elastic?$
A. $A rubber band$
B. $A glass rod$
C. $A piece of chalk$
D. $A brick$
2.
$Which metal is widely used for making food cans because it does not rust easily?$
A. $Magnesium$
B. $Iron$
C. $Aluminium$
D. $Sodium$
3.
$What is the process called when a liquid changes into a gas at a temperature below its boiling point?$
A. $Freezing$
B. $Melting$
C. $Evaporation$
D. $Condensation$
4.
$Which of these materials is opaque?$
A. $Clear glass$
B. $Air$
C. $A wooden door$
D. $Clean water$
5.
$Materials like food scraps and paper are described as biodegradable because they:$
A. $Can be dissolved in water easily$
B. $Are made by chemical factories$
C. $Can be broken down by living organisms$
D. $Do not have a melting point$
6.
$25^{\circ}\text{C}$
A. $Dilute$
B. $Concentrated$
C. $Saturated$
D. $Insoluble$
7.
$Four rods made of different materials are placed in boiling water. After one minute, which rod will most likely have the highest temperature at the end not in the water?$
A. $Glass rod$
B. $Wooden rod$
C. $Copper rod$
D. $Plastic rod$
8.
$A material is described as being 'brittle'. Which statement best explains this at the particle level?$
A. $The particles are held together by very weak forces.$
B. $The particles are arranged in layers that slide easily.$
C. $When a force is applied, the structure shatters because the particles cannot move past each other without breaking the bonds.$
D. $The particles are free to move randomly like in a liquid.$
9.
$Which of the following would be the best method to separate a mixture of sand, salt, and iron filings?$
A. $Dissolve in water, then filter, then evaporate.$
B. $Use a magnet, then dissolve in water, then filter, then evaporate the filtrate.$
C. $Distill the mixture, then use a magnet.$
D. $Filter the dry mixture, then use a magnet.$
10.
$In a saturated solution at a specific temperature, what is happening at the molecular level?$
A. $The solvent particles have stopped moving.$
B. $The rate of dissolving is equal to the rate of recrystallization.$
C. $All the solvent particles have reacted with the solute.$
D. $The solute particles have become larger than the solvent particles.$

Download the worksheet for Chemistry - Properties of Materials to practice offline. It includes additional chapter-level practice questions.

Elements, Compounds, and Mixtures

Subtopic

Elements, Compounds, and Mixtures under Chemistry for Grade 7 IGCSE.

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1.
$Which of the following is a mixture containing red blood cells, white blood cells, and plasma?$
A. $Pure water$
B. $Blood$
C. $Salt$
D. $Iron$
2.
$What is the chemical symbol for Silicon?$
A. $S$
B. $Si$
C. $Sl$
D. $Sn$
3.
$Which of these is a pure element that we breathe in to survive?$
A. $Water$
B. $Carbon Dioxide$
C. $Oxygen$
D. $Sugar$
4.
$What is the chemical symbol for Boron?$
A. $Bo$
B. $Br$
C. $B$
D. $Bn$
5.
$When a solid dissolves in a liquid, the temperature of the mixture often changes. This indicates that:$
A. $A chemical compound has definitely been formed$
B. $Energy is involved in the physical process of dissolving$
C. $The solid is reacting with the container$
D. $The liquid is changing its chemical formula$
6.
$C_{6}H_{12}O_{6}$
A. $An element$
B. $A mixture$
C. $A compound$
D. $An atom$
7.
$Which of these is a heterogeneous mixture?$
A. $Vinegar$
B. $Brass$
C. $Concrete$
D. $Sugar water$
8.
$2H_2 + O_2 \rightarrow 2H_2O$
A. $The number of molecules on both sides of the equation must be equal$
B. $The total mass of the reactants equals the total mass of the products$
C. $The volume of the gases stays the same throughout the reaction$
D. $The atoms are destroyed and new ones are created$
9.
$In a saturated solution at a specific temperature:$
A. $No more solute can be dissolved in the solvent$
B. $The solvent has started to evaporate$
C. $The solute and solvent have reacted to form a new compound$
D. $The mixture has become a pure substance$
10.
$Which of the following is a property of a metalloid?$
A. $It has properties intermediate between metals and non-metals$
B. $It is always a gas at room temperature$
C. $It is extremely reactive with noble gases$
D. $It cannot form compounds with oxygen$

Download the worksheet for Chemistry - Elements, Compounds, and Mixtures to practice offline. It includes additional chapter-level practice questions.

Acids and Alkalis

Subtopic

Acids and Alkalis under Chemistry for Grade 7 IGCSE.

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1.
$Which of these substances is likely to have a pH greater than 7?$
A. $Lemon juice$
B. $Battery acid$
C. $Soap water$
D. $Vinegar$
2.
$What happens to the pH of an acidic solution when you add more water to it?$
A. $It increases towards 7$
B. $It decreases towards 0$
C. $It stays the same$
D. $It increases to 14$
3.
$What color would Universal Indicator turn in a solution of pH 1?$
A. $Green$
B. $Blue$
C. $Purple$
D. $Red$
4.
$Which of these describes a substance with a pH of 8?$
A. $Neutral$
B. $Weakly acidic$
C. $Weakly alkaline$
D. $Strongly alkaline$
5.
$Which of the following pH values represents a weak acid?$
A. $pH 1$
B. $pH 5$
C. $pH 7$
D. $pH 9$
6.
$A student accidentally spills a small amount of dilute acid on their hand. What should they do immediately?$
A. $Neutralize it with a strong alkali$
B. $Wipe it off with a dry paper towel$
C. $Wash it with plenty of running water$
D. $Wait for it to dry$
7.
$What is the product of the reaction between Nitric Acid and Ammonia?$
A. $Ammonium chloride$
B. $Ammonium nitrate$
C. $Ammonium sulfate$
D. $Ammonium carbonate$
8.
$H_3PO_4$
A. $H_3PO_4 + NaOH \rightarrow NaPO_4 + H_2O$
B. $H_3PO_4 + 3NaOH \rightarrow Na_3PO_4 + 3H_2O$
C. $2H_3PO_4 + 3NaOH \rightarrow Na_3(PO_4)_2 + 3H_2O$
D. $H_3PO_4 + NaOH \rightarrow Na_3PO_4 + H_2O$
9.
$A solution of sodium hydroxide is added to a solution of iron(III) sulfate. What is the observation?$
A. $A blue precipitate forms.$
B. $A green precipitate forms.$
C. $A reddish-brown precipitate forms.$
D. $A white precipitate forms.$
10.
$What is the name of the salt formed when ammonia reacts with hydrochloric acid?$
A. $Ammonia chloride$
B. $Ammonium chloride$
C. $Nitrogen chloride$
D. $Ammonium chlorate$

Download the worksheet for Chemistry - Acids and Alkalis to practice offline. It includes additional chapter-level practice questions.

Chemical Reactions and Equations

Subtopic

Chemical Reactions and Equations under Chemistry for Grade 7 IGCSE.

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1.
$Which of these is a characteristic of a chemical change?$
A. $It is easily reversible$
B. $No new substances are made$
C. $A new substance is formed$
D. $The mass always increases$
2.
$Sulfur + Oxygen \rightarrow Sulfur \ dioxide$
A. $Sulfur$
B. $Oxygen$
C. $Sulfur dioxide$
D. $Sulfuric acid$
3.
$Which of these is a way to describe a reaction where a substance loses oxygen?$
A. $Oxidation$
B. $Reduction$
C. $Combustion$
D. $Thermal decomposition$
4.
$Carbon + ? \rightarrow Carbon \ dioxide$
A. $Hydrogen$
B. $Water$
C. $Oxygen$
D. $Nitrogen$
5.
$20^{\circ}C$
A. $The reaction is endothermic and absorbs heat.$
B. $The reaction is exothermic and releases heat.$
C. $The reaction is physical because the temperature changed.$
D. $The reaction is at equilibrium.$
6.
$A student burns 5g of magnesium in oxygen. The resulting magnesium oxide weighs 8.3g. How much oxygen was used in the reaction?$
A. $13.3g$
B. $8.3g$
C. $3.3g$
D. $5.0g$
7.
$Which of the following is the correct word equation for cellular respiration?$
A. $\rightarrow$
B. $\rightarrow$
C. $\rightarrow$
D. $\rightarrow$
8.
$2K + 2H_{2}O \rightarrow 2KOH + H_{2}$
A. $1:1$
B. $2:1$
C. $1:2$
D. $4:2$
9.
$Which of these observations would best indicate that an exothermic reaction is occurring in a test tube?$
A. $The test tube feels cold to the touch.$
B. $The test tube feels hot to the touch.$
C. $A purple solid dissolves to form a purple solution.$
D. $The color of the liquid remains the same.$
10.
$28g$
A. $22g$
B. $34g$
C. $31g$
D. $17g$

Download the worksheet for Chemistry - Chemical Reactions and Equations to practice offline. It includes additional chapter-level practice questions.

The Periodic Table Introduction

Subtopic

The Periodic Table Introduction under Chemistry for Grade 7 IGCSE.

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1.
$The Periodic Table is a chart that organizes all known:$
A. $Compounds$
B. $Mixtures$
C. $Elements$
D. $Molecules$
2.
$What is the chemical symbol for the element Argon?$
A. $A$
B. $Ar$
C. $Ag$
D. $An$
3.
$Which of these is an example of an Alkali Metal?$
A. $Lithium$
B. $Argon$
C. $Fluorine$
D. $Copper$
4.
$What is the chemical symbol for the element Tin?$
A. $Ti$
B. $T$
C. $Sn$
D. $Tn$
5.
$In the Periodic Table, elements in a single period are arranged by increasing atomic number. Based on the sequential pattern shown in the diagram, what is the atomic number of the 'Target Element'?$
A. $12$
B. $13$
C. $14$
D. $15$
6.
$The diagram displays a vertical section of the Periodic Table from Group 2. Based on the arrangement of periods, which element correctly replaces the 'X' in Period 3?$
A. $Lithium$
B. $Beryllium$
C. $Magnesium$
D. $Calcium$
7.
$How are elements with similar chemical properties arranged in the Periodic Table?$
A. $In the same horizontal period$
B. $In the same vertical group$
C. $In alphabetical order$
D. $By their date of discovery$
8.
$3$
A. $10$
B. $12$
C. $14$
D. $2$
9.
$The elements in the Periodic Table are currently arranged in order of increasing...$
A. $Atomic mass$
B. $Atomic number$
C. $Number of neutrons$
D. $Density$
10.
$An atom of an element has an atomic number of 9. What is its likely charge when it forms an ion?$
A. $1+$
B. $1-$
C. $2+$
D. $7-$

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Chemistry

States of Matter

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The Particle Model

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Properties of Materials

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Elements, Compounds, and Mixtures

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Acids and Alkalis

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Chemical Reactions and Equations

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The Periodic Table Introduction

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