Chemistry: Properties of Matter
Each subtopic includes About section, revision page link, 10 preview questions, and practice CTAs.
Atomic Structure (Protons, Neutrons, Electrons)
SubtopicAtomic Structure (Protons, Neutrons, Electrons) under Chemistry: Properties of Matter for Grade 8 IB.
Preview questions (no answers)
- 1.
Which particle is found inside the nucleus alongside the proton?
A.Electron
B.Neutron
C.Photon
D.Orbit
- 2.
If an atom has 20 protons and 20 electrons, what is the net electrical charge?
A.+20
B.-20
C.0
D.40
- 3.
Which subatomic particle has a relative mass of 1 amu and no charge?
A.Proton
B.Electron
C.Neutron
D.Nucleus
- 4.
What particle is added to a nucleus to create a different isotope of the same element?
A.Proton
B.Neutron
C.Electron
D.Positron
- 5.
Aluminum has an atomic number of and a mass number of . How many subatomic particles are in its nucleus?
A.13
B.14
C.27
D.40
- 6.
Which statement correctly describes the relationship between protons and electrons in a cation?
A.The number of protons is equal to the number of electrons.
B.The number of protons is greater than the number of electrons.
C.The number of electrons is greater than the number of protons.
D.The number of protons is zero.
- 7.
If an atom has protons and neutrons, what is its atomic number?
A.3
B.4
C.7
D.1
- 8.
In the modern model of the atom, which particle determines the identity of the element?
A.Proton
B.Neutron
C.Electron
D.Valence electron
- 9.
If an atom has 11 protons, 12 neutrons, and 11 electrons, what is its identity and mass number?
A.Sodium, 23
B.Magnesium, 23
C.Sodium, 11
D.Magnesium, 12
- 10.
What is the total number of electrons in a molecule of water ()?
A.10
B.18
C.8
D.3
Download the worksheet for Chemistry: Properties of Matter - Atomic Structure (Protons, Neutrons, Electrons) to practice offline. It includes additional chapter-level practice questions.
The Periodic Table and Element Trends
SubtopicThe Periodic Table and Element Trends under Chemistry: Properties of Matter for Grade 8 IB.
Preview questions (no answers)
- 1.
The total number of protons and neutrons in an atom's nucleus is called the:
A.Atomic Number
B.Mass Number
C.Group Number
D.Isotope Number
- 2.
Which of these symbols represents Fluorine?
A.B.C.D. - 3.
What is the chemical symbol for Calcium?
A.B.C.D. - 4.
Which group contains the most stable (least reactive) elements?
A.Group 1
B.Group 2
C.Group 17
D.Group 18
- 5.
Which property decreases as you move from left to right across Period 3?
A.Atomic Number
B.Number of protons
C.Metallic character
D.Number of valence electrons
- 6.
Which of the following elements is found in Period 4?
A.Magnesium
B.Potassium
C.Sodium
D.Lithium
- 7.
How many electrons can the first energy shell (closest to the nucleus) hold at maximum?
A.8
B.2
C.18
D.1
- 8.
When an atom of Sulfur () becomes a sulfide ion (), what happens to its electron configuration?
A.It loses 2 electrons to match Neon ().
B.It gains 2 electrons to match Argon ().
C.It gains 2 electrons to match Oxygen ().
D.It loses 6 electrons to match Magnesium ().
- 9.
Which of the following statements about Silicon () is true?
A.It is a metal in Period 4.
B.It is a non-metal in Group 14.
C.It is a metalloid in Period 3.
D.It is an alkali metal in Group 1.
- 10.
Which of the following is the correct order of the elements in Group 1 by reactivity (least reactive to most reactive)?
A.B.C.D.
Download the worksheet for Chemistry: Properties of Matter - The Periodic Table and Element Trends to practice offline. It includes additional chapter-level practice questions.
Chemical vs. Physical Changes
SubtopicChemical vs. Physical Changes under Chemistry: Properties of Matter for Grade 8 IB.
Preview questions (no answers)
- 1.
Which of the following describes a physical change to a metal?
A.Iron rusting
B.Silver tarnishing
C.Copper turning green
D.Gold being hammered into a thin sheet
- 2.
A chemical change always results in:
A.A change of state
B.The formation of new substances
C.A change in mass
D.The substance melting
- 3.
What is an example of a physical change when preparing a salad?
A.Slicing the cucumbers
B.The cucumbers rotting
C.The dressing reacting with the bowl
D.The salad fermenting
- 4.
Which of the following is an example of a chemical change in food?
A.Cutting a tomato
B.Peeling an orange
C.Milk turning sour
D.Stirring soup
- 5.
Which of the following statements best describes the 'Law of Conservation of Mass' in the context of a chemical reaction?
A.The mass of the products is always less than the reactants if a gas is produced.
B.The total mass of the reactants must equal the total mass of the products.
C.Mass is only conserved in physical changes, not chemical changes.
D.The number of molecules must be the same before and after the reaction.
- 6.
A student observes that when a piece of paper is shredded, it is a physical change, but when it is burned, it is a chemical change. What is the reason for this distinction?
A.Shredding changes the size, while burning changes the chemical composition.
B.Shredding is irreversible, while burning is reversible.
C.Burning involves heat, and shredding does not.
D.Shredding creates new matter, while burning destroys it.
- 7.
Which of the following is a physical property that can be observed without changing the substance into another substance?
A.Reactivity with water
B.Toxicity
C.Boiling point
D.Stability under UV light
- 8.
A student mixes vinegar and baking soda in a balloon-topped bottle. The balloon inflates. The student then puts the bottle in the freezer. The balloon deflates significantly. What sequence of changes occurred?
A.Chemical change (reaction) followed by a physical change (gas contraction).
B.Physical change (mixing) followed by a chemical change (freezing).
C.Chemical change (reaction) followed by another chemical change (decomposition of gas).
D.Physical change (inflation) followed by a physical change (deflation).
- 9.
Why is the 'fading of colored clothes' in the sun usually a chemical change?
A.The water in the clothes evaporates, leaving the dye behind.
B.Ultraviolet radiation provides the activation energy to break the chemical bonds in the dye molecules (photodegradation).
C.The heat from the sun melts the dye, causing it to run off the fabric.
D.The dye molecules are physically rubbed off the clothes by the sunlight.
- 10.
During the 'hardening' of concrete, a reaction called hydration occurs between cement and water. This process continues for years. Why is this not simply 'drying'?
A.Drying is a physical change (evaporation), whereas hydration is a chemical change that incorporates water into the crystal structure of new compounds.
B.Drying is a chemical change, whereas hydration is a physical change of soaking.
C.The concrete gets heavier as it dries, which only happens in physical changes.
D.The process releases coldness (endothermic), which is a sign of a physical change.
Download the worksheet for Chemistry: Properties of Matter - Chemical vs. Physical Changes to practice offline. It includes additional chapter-level practice questions.
Acids, Bases, and the pH Scale
SubtopicAcids, Bases, and the pH Scale under Chemistry: Properties of Matter for Grade 8 IB.
Preview questions (no answers)
- 1.
Which of these is the most acidic pH value listed?
A.pH 2
B.pH 4
C.pH 6
D.pH 8
- 2.
The 'p' in pH stands for 'potenz' (power) and the 'H' stands for:
A.Helium
B.Hydrogen
C.Hydroxide
D.Heat
- 3.
Which pH value is closest to that of soapy water?
A.pH 2
B.pH 5
C.pH 7
D.pH 9
- 4.
Which of these is a correct word equation for a neutralization reaction?
A.Acid + Metal -> Salt + Hydrogen
B.Acid + Base -> Salt + Water
C.Acid + Carbonate -> Salt + Water
D.Base + Water -> Acid
- 5.
When an acid reacts with a metal, such as Zinc, what is the visual evidence that a gas is being produced?
A.The solution turns blue
B.The solution becomes clear
C.Effervescence (bubbles) are seen
D.A solid precipitate forms at the bottom
- 6.
Which of these ions is responsible for the acidity of a solution?
A.Sodium ion ()
B.Hydrogen ion ()
C.Hydroxide ion ()
D.Chloride ion ()
- 7.
A solution of pH 4 is how many times more acidic than a solution of pH 6?
A.2 times
B.10 times
C.20 times
D.100 times
- 8.
Which of the following contains the highest number of moles of ions?
A.10 of 1
B.100 of 0.1
C.50 of 0.2
D.All of the above contain the same number of moles.
- 9.
When zinc metal reacts with hydrochloric acid, the total mass of the flask and its contents decreases over time. Why?
A.The zinc is being destroyed.
B.Hydrogen gas is being produced and escaping.
C.The acid is evaporating.
D.The reaction is absorbing mass from the surroundings.
- 10.
A student mix equal volumes of pH 2 and pH 12 solutions. What is the most likely pH of the resulting mixture?
A.pH 7
B.pH 14
C.pH 2
D.pH 10
Download the worksheet for Chemistry: Properties of Matter - Acids, Bases, and the pH Scale to practice offline. It includes additional chapter-level practice questions.
Chemical Bonding and Naming Compounds
SubtopicChemical Bonding and Naming Compounds under Chemistry: Properties of Matter for Grade 8 IB.
Preview questions (no answers)
- 1.
The diagram shows the ratio of atoms that combine to form a stable ionic compound. What is the correct chemical name for the compound represented by the formula ?
A.Calcium Fluorine
B.Calcium Fluoride
C.Carbon Fluoride
D.Calcium Difluoride
- 2.
What is the correct chemical name for ?
A.Sodium sulfur
B.Disodium sulfide
C.Sodium sulfide
D.Sodium sulfate
- 3.
What does the prefix 'di-' mean when naming a covalent compound?
A.One
B.Two
C.Three
D.Four
- 4.
Which of the following substances is an ionic compound?
A.B.C.D. - 5.
Methane () is the main component of natural gas. What type of bonding holds the Carbon and Hydrogen atoms together?
A.Ionic
B.Covalent
C.Metallic
D.Hydrogen
- 6.
Lead(IV) oxide contains Lead ions with a charge and Oxide ions with a charge. What is its formula?
A.B.C.D. - 7.
What is the valency of Phosphorus when it forms an ionic bond with a metal?
A.B.C.D. - 8.
What is the correct chemical formula for Barium thiosulfate, given the thiosulfate ion is ?
A.B.C.D. - 9.
Which type of bonding involves the complete transfer of electrons from a metal atom to a non-metal atom?
A.Covalent
B.Ionic
C.Metallic
D.Dative
- 10.
Which compound is formed by sharing three pairs of electrons between two atoms?
A.B.C.D.
Download the worksheet for Chemistry: Properties of Matter - Chemical Bonding and Naming Compounds to practice offline. It includes additional chapter-level practice questions.