Matter and Chemical Change
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Particle Model of Matter
SubtopicParticle Model of Matter under Matter and Chemical Change for Grade 7 IB.
Preview questions (no answers)
- 1.
When steam touches a cold mirror and turns into water droplets, this is called:
A.Melting
B.Evaporation
C.Condensation
D.Sublimation
- 2.
What do we call the change of state from liquid to gas that occurs only at the surface of the liquid?
A.Boiling
B.Evaporation
C.Freezing
D.Melting
- 3.
Which state of matter is characterized by particles vibrating in fixed positions?
A.Gas
B.Liquid
C.Solid
D.Vapor
- 4.
If you decrease the temperature of a gas, its particles will move:
A.Faster
B.Slower
C.At the same speed
D.In circles
- 5.
A student carefully mixes of water with of isopropyl alcohol. After stirring the mixture, they observe that the total volume is only instead of . Which statement best explains this observation using the particle model of matter?
A.The particles of both liquids bonded together to form new, heavier particles that occupy less space.
B.The total number of particles decreased because some matter was destroyed when the liquids were combined.
C.The particles of one liquid are smaller and fit into the empty spaces between the particles of the other liquid.
D.The individual particles of both liquids shrank in size due to a cooling effect during the mixing process.
- 6.
Which of the following represents a substance where particles are widely spaced and move independently?
A.A block of ice
B.A glass of orange juice
C.Helium inside a balloon
D.A copper wire
- 7.
Why does the mass of a sealed container remain the same even if the liquid inside evaporates into a gas?
A.Gases have no mass.
B.The number of particles remains constant despite the change in state.
C.Liquid particles are heavier than gas particles.
D.The pressure inside the container balances the mass.
- 8.
If a gas is cooled until it turns into a liquid, what has happened to the 'lost' energy?
A.It was destroyed during the phase change.
B.It was converted into potential energy within the particles.
C.It was transferred to the surroundings as heat.
D.It was used to make the particles smaller.
- 9.
What is the primary factor that determines whether a substance is a solid, liquid, or gas at room temperature?
A.The mass of its individual particles.
B.The balance between the kinetic energy of the particles and the strength of the attractive forces between them.
C.The amount of light the substance can absorb.
D.The total volume of the substance available in the universe.
- 10.
Why is it that you can smell a gas but often cannot see it, based on the particle model?
A.Gas particles are too small and too far apart to reflect enough light for our eyes to detect.
B.Gas particles are invisible because they move faster than the speed of light.
C.Gas particles absorb all the light that hits them, making them transparent.
D.Gas particles only exist when we are smelling them.
Download the worksheet for Matter and Chemical Change - Particle Model of Matter to practice offline. It includes additional chapter-level practice questions.
States of Matter
SubtopicStates of Matter under Matter and Chemical Change for Grade 7 IB.
Preview questions (no answers)
- 1.
In which state are the attractive forces between particles the weakest?
A.Solid
B.Liquid
C.Gas
D.They are the same in all states
- 2.
When steam touches a cold soda can, it turns into water droplets. This is called:
A.Evaporation
B.Condensation
C.Melting
D.Sublimation
- 3.
What is the term for the amount of space an object occupies?
A.Mass
B.Weight
C.Volume
D.Density
- 4.
Which of these is a property of a liquid?
A.It can be squashed easily
B.It has a fixed shape
C.It has a definite volume
D.Its particles only vibrate in place
- 5.
When using a thermometer to measure the temperature of boiling water, the level of the liquid inside the thermometer rises. Why?
A.More liquid is created inside the thermometer.
B.The liquid inside the thermometer expands due to increased particle motion.
C.The glass of the thermometer shrinks and squeezes the liquid up.
D.Air enters the thermometer and pushes the liquid up.
- 6.
If you double the speed of the particles in a gas, what property have you primarily changed?
A.Its mass
B.Its chemical identity
C.Its temperature
D.Its color
- 7.
What is 'Brownian Motion'?
A.The movement of large particles due to gravity.
B.The random movement of visible particles caused by collisions with invisible atoms or molecules.
C.The change of state from a solid to a liquid.
D.The process of heat moving through a metal rod.
- 8.
A scientist compares two samples of gas in identical sealed flasks. Flask A contains Helium atoms (mass ) and Flask B contains Xenon atoms (mass ). If both gases are kept at exactly , which of the following is a correct comparison of the behavior of the particles in the two flasks?
A.The Xenon atoms have a higher average kinetic energy than the Helium atoms because they are much heavier.
B.The average speed of the Helium atoms is significantly higher than the average speed of the Xenon atoms.
C.Both types of gas atoms move at the same average speed because they are at the same temperature.
D.The Helium atoms have a lower average kinetic energy than the Xenon atoms because they have less mass.
- 9.
A substance has a melting point of and a boiling point of . At , what state is the substance in, and how are the particles moving?
A.Solid; vibrating in fixed positions.
B.Gas; moving rapidly in all directions.
C.Liquid; sliding over each other and taking the shape of the container.
D.Plasma; ionized and highly energetic.
- 10.
What happens to the particles of a gas if the absolute temperature is doubled at constant volume?
A.The particles double in size.
B.The average kinetic energy of the particles doubles.
C.The particles move at half the speed they did before.
D.The attractive forces between the particles double.
Download the worksheet for Matter and Chemical Change - States of Matter to practice offline. It includes additional chapter-level practice questions.
Elements, Compounds, and Mixtures
SubtopicElements, Compounds, and Mixtures under Matter and Chemical Change for Grade 7 IB.
Preview questions (no answers)
- 1.
The vertical columns on the periodic table are known as:
A.Periods
B.Rows
C.Groups
D.Scales
- 2.
Which of the following is the chemical symbol for Fluorine?
A.Fl
B.F
C.Fe
D.Fr
- 3.
Which of these is a characteristic of a pure substance?
A.It can be separated by filtration.
B.It has a constant composition.
C.It is always a liquid.
D.It must contain at least two different elements.
- 4.
Which element has the chemical symbol 'O'?
A.Osmium
B.Gold
C.Oxygen
D.Ozone
- 5.
Which of the following is the correct symbol for Gold?
A.B.C.D. - 6.
In a laboratory, a student accidentally mixes iron filings with sugar. What property of iron allows the student to separate it from the sugar easily?
A.Solubility
B.Density
C.Magnetism
D.Melting point
- 7.
Which of the following correctly describes an atom?
A.The smallest unit of a compound that still has the compound's properties.
B.A mixture of different elements.
C.The smallest particle of an element that retains the properties of that element.
D.A group of molecules bonded together.
- 8.
Which of the following would be the most effective way to separate a mixture of two solids with very different solubilities in hot and cold water?
A.Filtration
B.Fractional crystallization
C.Simple distillation
D.Magnetic separation
- 9.
A liquid is found to have a pH of 7 and leaves no residue when evaporated. However, when it is cooled to , it is still a liquid. What can you conclude?
A.It is pure water.
B.It is a mixture (likely water with a dissolved solute).
C.It is a pure element with a low freezing point.
D.It is a compound that does not freeze.
- 10.
A sample of 'stainless steel' is used to make kitchen utensils. It contains iron, chromium, and nickel. These atoms are not chemically bonded in a specific ratio. Stainless steel is a:
A.Compound
B.Heterogeneous mixture
C.Homogeneous mixture (Alloy)
D.Pure element
Download the worksheet for Matter and Chemical Change - Elements, Compounds, and Mixtures to practice offline. It includes additional chapter-level practice questions.
Physical vs. Chemical Changes
SubtopicPhysical vs. Chemical Changes under Matter and Chemical Change for Grade 7 IB.
Preview questions (no answers)
- 1.
If you mix sand and water, and the sand sinks to the bottom, what has happened?
A.A chemical change occurred
B.A physical change occurred
C.The sand turned into water
D.A new substance was created
- 2.
Which of the following is a clue that a chemical change has taken place?
A.A change in volume
B.A change in texture
C.The evolution of heat or cold
D.Breaking into smaller pieces
- 3.
Melting a lead weight to pour it into a new mold is a:
A.Chemical change
B.Physical change
C.Biological change
D.Geological change
- 4.
When milk is left in a warm room and it becomes lumpy and smells bad, what has happened?
A.A physical change because the milk is still liquid
B.A chemical change because new substances have formed
C.A physical change because the temperature changed
D.No change has occurred
- 5.
Which of these processes describes a chemical change involving the atmosphere?
A.Nitrogen gas being compressed into a tank.
B.Oxygen reacting with a forest to produce a wildfire.
C.Water vapor forming clouds in the sky.
D.Wind blowing dust across a desert.
- 6.
A piece of lead is melted and poured into a mold to make a fishing weight. Once it cools and solidifies, what has happened?
A.A chemical change occurred because the lead changed its form.
B.A physical change occurred because the lead is still the element lead.
C.A chemical change occurred because heat was used.
D.A physical change occurred because the lead reacted with the mold.
- 7.
When milk turns sour, it develops a sharp taste and a thick texture. This is because bacteria have converted lactose sugar into lactic acid. This is a:
A.Physical change because it is still milk.
B.Chemical change because a new substance (lactic acid) has been formed.
C.Physical change because only the taste changed.
D.Chemical change because the milk changed color.
- 8.
Observe the reaction: . If a catalyst like manganese dioxide is added, the reaction speeds up significantly. The catalyst itself is recovered unchanged at the end. What does this indicate?
A.The catalyst underwent a physical change but the hydrogen peroxide underwent a chemical change.
B.The entire process is a physical change because the catalyst was not consumed.
C.The catalyst was a reactant that turned into a product and back again.
D.The hydrogen peroxide molecules were physically shaken apart by the catalyst.
- 9.
Why is the process of 'dissolving' often a point of debate between physical and chemical changes at an advanced level?
A.Because it involves the breaking of all covalent bonds within the solute.
B.Because it involves interactions between solute and solvent particles that can release or absorb energy, similar to bond formation.
C.Because the solute disappears, which is the definition of a chemical reaction.
D.Because the resulting solution always has a higher mass than the sum of its parts.
- 10.
In an experiment, methane () is burned in oxygen () to produce carbon dioxide () and water (). Which of the following is true about the atoms involved?
A.Some of the carbon atoms are converted into energy to produce the flame.
B.The number of hydrogen atoms in the reactants is exactly equal to the number of hydrogen atoms in the products.
C.The oxygen atoms are destroyed and replaced by carbon dioxide atoms.
D.The methane molecules are simply compressed to form liquid water.
Download the worksheet for Matter and Chemical Change - Physical vs. Chemical Changes to practice offline. It includes additional chapter-level practice questions.
Introduction to the Periodic Table
SubtopicIntroduction to the Periodic Table under Matter and Chemical Change for Grade 7 IB.
Preview questions (no answers)
- 1.
What is the chemical symbol for Sulfur?
A.Su
B.Sf
C.S
D.Sl
- 2.
The Alkali Metals are found in which group of the Periodic Table?
A.Group 1
B.Group 2
C.Group 17
D.Group 18
- 3.
Where are the Transition Metals located on the Periodic Table?
A.The far left column
B.The far right column
C.The middle block
D.The very top row
- 4.
Which property is common for metalloids?
A.They only act as gases
B.They have properties of both metals and non-metals
C.They are all highly radioactive
D.They are located in Group 1
- 5.
The Periodic Table is organized such that the atomic number increases by exactly one for each element as you move from left to right across a period. Based on the sequence shown in the diagram, which element occupies the position with an atomic number of ?
A.Silicon ()
B.Sulfur ()
C.Nitrogen ()
D.Chlorine ()
- 6.
Which element is the most basic building block of organic life and has the atomic number 6?
A.Nitrogen ()
B.Oxygen ()
C.Carbon ()
D.Hydrogen ()
- 7.
If you are looking at an element in Group 17, which other element is in that same vertical column?
A.Iodine ()
B.Sulfur ()
C.Argon ()
D.Oxygen ()
- 8.
An element is located in Period 4, Group 17. How many electron shells does it have, and how many valence electrons?
A.4 shells, 7 valence electrons
B.17 shells, 4 valence electrons
C.4 shells, 17 valence electrons
D.7 shells, 4 valence electrons
- 9.
Which of the following subatomic particles is responsible for determining the chemical identity of an element?
A.Electron
B.Proton
C.Neutron
D.Positron
- 10.
Which of the following elements is most likely to form a cation?
A.Lithium ()
B.Beryllium ()
C.Boron ()
D.Neon ()
Download the worksheet for Matter and Chemical Change - Introduction to the Periodic Table to practice offline. It includes additional chapter-level practice questions.
Separating Mixtures (Filtration, Distillation, Chromatography)
SubtopicSeparating Mixtures (Filtration, Distillation, Chromatography) under Matter and Chemical Change for Grade 7 IB.
Preview questions (no answers)
- 1.
Which of the following describes the movement of the solvent in chromatography?
A.It moves down the paper due to gravity
B.It stays at the bottom of the beaker
C.It moves up the paper by capillary action
D.It evaporates before reaching the ink
- 2.
What is the boiling point of pure water at standard pressure?
A.B.C.D. - 3.
In an experiment to separate sand, salt, and water, which process would you use LAST?
A.Filtration
B.Evaporation
C.Dissolving
D.Decanting
- 4.
What is the main advantage of using chromatography in forensic science?
A.It can separate tiny amounts of complex mixtures
B.It is the only way to see color
C.It creates new substances
D.It is very loud
- 5.
Which of the following is true about the substances in a mixture being separated by chromatography?
A.They must all have the same boiling point
B.They must be insoluble in the mobile phase
C.They travel at different speeds based on their properties
D.They must be chemically bonded to the paper
- 6.
What role does gravity play in a basic laboratory filtration setup?
A.It pulls the liquid through the filter paper into the flask
B.It keeps the filter paper from floating away
C.It helps the solid dissolve in the liquid
D.It separates the mixture based on boiling point
- 7.
When separating a mixture of sawdust and water, why is filtration more efficient than chromatography?
A.Sawdust is soluble in water
B.Sawdust particles are too large to move through chromatography paper
C.Chromatography only works for liquids
D.Filtration uses chemicals to dissolve the sawdust
- 8.
Which of these factors does NOT affect the value of a substance in paper chromatography?
A.The total length of the chromatography paper
B.The type of solvent used
C.The temperature of the environment
D.The type of paper used
- 9.
To separate a mixture of two solids where one is soluble in water and the other is not, which sequence is correct?
A.Add water, stir, filter, evaporate the filtrate
B.Filter, add water to the residue, evaporate
C.Evaporate the solid mixture, then add water
D.Distill the mixture, then filter
- 10.
If a student uses a permanent marker to draw the baseline in chromatography, what will they observe?
A.The baseline will likely bleed or move with the solvent, ruining the chromatogram
B.The results will be clearer because the line is darker
C.The dyes will travel further because of the chemicals in the marker
D.Nothing will change; the marker behaves the same as a pencil
Download the worksheet for Matter and Chemical Change - Separating Mixtures (Filtration, Distillation, Chromatography) to practice offline. It includes additional chapter-level practice questions.