IQWST IC2 Review

What is the significance of the pH scale in chemistry?

• It measures the temperature of a solution.

• It measures the acidity or basicity of a solution, with values ranging from 0 (acidic) to 14 (basic), and 7 being neutral.

• It indicates the concentration of solutes in a solution.

• It determines the color of a solution.

What is the role of reactants in a chemical reaction?

• Reactants are the final products of a chemical reaction.

• Reactants are the substances that do not change during the reaction.

• Reactants are the starting substances that undergo a chemical change.

• Reactants are the catalysts that speed up the reaction.

What is the difference between a physical change and a chemical change?

• A physical change alters the form of a substance but not its chemical composition, while a chemical change results in the formation of new substances.

• A physical change results in the formation of new substances, while a chemical change alters the form of a substance.

• Both physical and chemical changes do not affect the chemical composition of a substance.

• A physical change is reversible, while a chemical change is irreversible.

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What is a chemical reaction?

• A process that leads to the transformation of one set of chemical substances to another.

• A method of separating mixtures into their individual components.

• A technique used to measure the pH of a solution.

• A way to combine different elements without changing their properties.

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What is the difference between an atom and a molecule?

• An atom is the smallest unit of an element, while a molecule is a group of two or more atoms bonded together.

• An atom is a group of two or more molecules, while a molecule is a single unit of an element.

• An atom can exist independently, while a molecule cannot exist without an atom.

• An atom is larger than a molecule, which is made up of smaller particles.

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What unit is mass measured in?

• Kilograms

• Pounds

• Grams

• Ounces

What happens to the density of a loaf of bread when it is cut in half?

• The density increases for each half.

• The density decreases for each half.

• The density remains the same for each half.

• The density becomes zero for each half.

What is the difference between an element and a compound?

• An element is a pure substance that cannot be broken down into simpler substances, while a compound is made up of two or more elements chemically bonded together.

• An element is a mixture of different substances, while a compound is a single substance.

• An element can be broken down into simpler substances, while a compound cannot.

• An element is always a solid, while a compound can be a solid, liquid, or gas.

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What is the law of conservation of mass?

• Mass can be created or destroyed in a chemical reaction.

• The total mass of reactants is always greater than the total mass of products.

• Mass is neither created nor destroyed in a chemical reaction.

• Mass can change forms but is always conserved.

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In the chemical reaction H2O + CO2 → H2CO3, what are the reactants?

• H2O and CO2

• H2CO3 and O2

• H2 and CO2

• H2O and O2

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