1.3 Reading Quiz Explore

Charlotte, Nora, and Ethan are discussing the properties of matter. Which of the following statements about matter are true?

• matter can release and store energy through chemical reactions

• matter doesn't take up space or volume

• Matter cannot be created nor destroyed through chemical means.

• All matter is made up of molecules.

Answer explanation

The correct statements about matter are: it can release and store energy through chemical reactions, it cannot be created nor destroyed through chemical means, and all matter is made up of molecules. The statement that matter doesn't take up space or volume is incorrect as matter always occupies space.

In a chemistry class, Ava and Grace are discussing a chemical reaction. They come across the reaction AX + BY → AY + BX. Which statement is incorrect about this reaction?

• BY is a reactant

• AY and BX are products

• AX and BY are reactants

• AX and BY are products

Answer explanation

The chemical reaction AX + BY → AY + BX shows that AX and BY are reactants, not products. They are the substances that react with each other to form new substances, AY and BX, which are the products. Therefore, the statement 'AX and BY are products' is incorrect.

Maya, Ethan, and Ava are studying for their chemistry exam. They are discussing the categories of chemical reactions. Ava makes a statement about the categories of chemical reactions. Which of Ava's statements is written correctly?

• Decomposition reactions usually involve a change in the pH of a substance.

• Decomposition reactions occur when reactants combine to make a new product.

• Energy is absorbed during a combustion reaction.

• Synthesis reactions occur when two reactants combine to make a new product.

Answer explanation

Ava's correct statement is about synthesis reactions, which occur when two reactants combine to form a new product. The other options are incorrect because decomposition reactions involve breaking down a compound into simpler substances, and energy is released, not absorbed, during combustion reactions.

Match the following Reaction types

• Combustion

• CH₃CO₂H +H₂O --> CH₃CO₂^- + H₃O⁺

• Acid-Base

• Zn(s) + 2HCl(aq) --> ZnCl₂(aq) + H₂

• Synthesis

• 2H₂O₂ + light --> 2H₂0 + O₂

• Single replacement

• C₆H₁₂O₆(s) + O₂ (g) --> 6CO₂ + 6H₂O(l) + heat

• Decomposition

• 6CO₂ + 6H₂0 + light energy --> C₆H₁₂O₆ + 6O₂

Sophia and Lily were conducting a chemistry experiment in their school lab. They mixed two chemicals and observed a change. The result of their experiment can be best described as ______

• mixture

• new substance / or compound

• element

• Light

Answer explanation

In the chemistry experiment, Sophia and Lily observed a change after mixing two chemicals. This indicates that a chemical reaction occurred, resulting in the formation of a new substance or compound. The other options, such as mixture, element, and light, do not accurately describe the outcome of their experiment.

Aria, Priya, and Anika are studying for their chemistry exam. They come across a question in their textbook: 'What are the different categories of Chemical reactions?'

• oxidation reactions, reduction reactions, neutralization reactions, displacement reactions, addition reactions, elimination reactions

• synthesis reactions, decomposition reactions, single displacement reactions, double displacement reactions, combustion reactions, and redox reactions

• acid-base reactions, precipitation reactions, exothermic reactions, endothermic reactions, reversible reactions, irreversible reactions

• polymerization reactions, condensation reactions, hydrolysis reactions, substitution reactions, isomerization reactions, rearrangement reactions

Answer explanation

The question asks about the different categories of chemical reactions. The correct choice lists synthesis, decomposition, single displacement, double displacement, combustion, and redox reactions. These are the main types of chemical reactions studied in chemistry.

Abigail and William were doing a chemistry experiment in which they mixed two solutions AX and BY. What type of reaction occurred if the result was AY and BX?

• Double displacement reaction

• Combustion reaction

• Decomposition reaction

• Single displacement reaction

Answer explanation

In a double displacement reaction, the ions of two compounds exchange places in an aqueous solution to form two new compounds. In this case, AX and BY react to form AY and BX, which is a classic example of a double displacement reaction.

Lily, Aiden, and Michael are trying to find the balanced chemical equation for the reaction between X and Y. What is the correct equation?

• X + Y -> XY

• 2X + 3Y -> XY

• X + 2Y -> XY

• N/A

Answer explanation

The correct answer is N/A because the question does not provide enough information about the substances X and Y to determine the balanced chemical equation. Without knowing the specific elements or compounds involved, it is impossible to accurately balance the equation.

Lily, Aria, and Daniel are discussing chemical reactions in their chemistry class. They are trying to identify which statement about the categories of chemical reactions is incorrect. Can you help them?

• Some chemical reactions are irreversible.

• Chemical reactions can be classified as exothermic or endothermic.

• Chemical reactions involve the rearrangement of atoms.

• All of the statements are correct.

Answer explanation

All the statements provided are indeed correct. Some chemical reactions are irreversible, meaning they cannot be reversed. Chemical reactions can be classified as exothermic (releasing energy) or endothermic (absorbing energy). Lastly, chemical reactions involve the rearrangement of atoms to form new substances.

David, Mason, and Aiden are conducting a science experiment. In their experiment, how would they define the reactants?

• Reactants are the substances that are produced in their experiment.

• Reactants are the substances that undergo a chemical change and are consumed in their experiment.

• Reactants are the substances that are not involved in their experiment.

• Reactants are the substances that are formed after their experiment.

Answer explanation

In the given question, David, Mason, and Aiden are conducting a science experiment and we need to define 'reactants'. The correct answer is that reactants are the substances that undergo a chemical change and are consumed in their experiment. This means that reactants are the starting materials in a chemical reaction that undergo changes to form new substances, which are called products.