Chemical Reactions Quiz

What is the law of conservation of mass?

• Mass can be created out of nothing

• Mass can change into energy without any limitations

• Mass can be destroyed completely

• Mass cannot be created or destroyed, only changed in form.

Define exothermic reaction.

• An exothermic reaction involves a decrease in entropy

• An exothermic reaction is always cold

• An exothermic reaction releases energy in the form of heat or light.

• An exothermic reaction absorbs energy

Explain the difference between endothermic and exothermic reactions.

• Endothermic reactions release heat

• Endothermic reactions are faster than exothermic reactions

• Endothermic reactions absorb heat, while exothermic reactions release heat.

• Exothermic reactions absorb heat

What is a catalyst in a chemical reaction?

• A catalyst is a substance that increases the rate of a chemical reaction without being consumed in the process.

• A catalyst is a substance that changes color during a chemical reaction

• A catalyst is a substance that slows down a chemical reaction

• A catalyst is a substance that is consumed in the chemical reaction

Describe the process of a chemical reaction.

• The process of a chemical reaction is solely based on temperature changes.

• Chemical reactions occur due to gravitational forces between molecules.

• A chemical reaction involves the transformation of physical states without any bond changes.

• A chemical reaction involves the transformation of reactants into products through the breaking and forming of chemical bonds.

What are the different types of chemical reactions?

• Oxidation, reduction, neutralization

• Solidification, liquidation, gasification

• Addition, subtraction, multiplication, division

• Synthesis, decomposition, single displacement, double displacement, combustion

What is a balanced chemical equation?

• A balanced chemical equation is one where the reactants and products are in the same physical state.

• A balanced chemical equation has an equal number of molecules for each element on both the reactant and product sides.

• A balanced chemical equation always includes the same number of reactants and products.

• A balanced chemical equation has an equal number of atoms for each element on both the reactant and product sides.

How do you identify a chemical reaction?

• Observe the time it takes to complete

• Look for signs such as color change, gas production, formation of a precipitate, or temperature change.

• Check for changes in texture

• Listen for sounds

What is a redox reaction?

• A redox reaction involves the formation of new compounds

• A redox reaction involves the absorption of electrons

• A redox reaction involves the transfer of electrons between two species.

• A redox reaction involves the release of energy

Discuss the role of enzymes in chemical reactions.

• Enzymes play a crucial role in chemical reactions by acting as catalysts to accelerate the reaction rate.

• Enzymes slow down chemical reactions

• Enzymes are only involved in physical reactions

• Enzymes have no impact on chemical reactions