Chemical Reactions

What is a chemical reaction?

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

• A process that leads to the transformation of physical substances

• A process that leads to the separation of chemical substances

• A process that leads to the creation of new elements

What are the different types of chemical reactions?

• Solid, liquid, gas, plasma

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

• Acidic, basic, neutral, alkaline

• Addition, subtraction, multiplication, division

What is the law of conservation of mass and how does it apply to chemical reactions?

• Mass is neither created nor destroyed in a chemical reaction, it is only transformed from one form to another.

• Mass is created in a chemical reaction and can be destroyed

• Mass is transformed into energy in a chemical reaction

• Mass is only conserved in physical reactions, not chemical reactions

What are the reactants and products in a chemical reaction?

• Reactants are the substances formed at the end, and products are the substances present at the beginning.

• Reactants and products are the same thing in a chemical reaction.

• Reactants are the substances that are not involved in the chemical reaction, and products are the substances that initiate the reaction.

• Reactants are the substances present at the beginning, and products are the substances formed at the end.

Explain the difference between exothermic and endothermic reactions.

• Exothermic reactions absorb heat energy from the surroundings

• Endothermic reactions release heat energy to the surroundings

• Exothermic reactions and endothermic reactions have no difference

• Exothermic reactions release heat energy to the surroundings, while endothermic reactions absorb heat energy from the surroundings.

What is a catalyst and how does it affect a chemical reaction?

• A catalyst has no effect on a chemical reaction.

• A catalyst speeds up a chemical reaction without being consumed in the process.

• A catalyst is a byproduct of a chemical reaction.

• A catalyst slows down a chemical reaction without being consumed in the process.

Describe the process of balancing a chemical equation.

• Removing some products from the equation

• Adjusting the coefficients of the reactants and products to ensure the same number of each type of atom is present on both sides of the equation.

• Adding more reactants to one side of the equation

• Doubling the entire equation

What is a reversible reaction?

• A reaction that only occurs in one direction

• A reaction that produces no change in the substances involved

• A reaction that can only proceed in the reverse direction

• A chemical reaction that can proceed in both the forward and reverse directions.

Explain the concept of limiting reactants in a chemical reaction.

• Limiting reactant is the substance that speeds up a chemical reaction

• Limiting reactant is the substance that is never consumed in a chemical reaction

• Limiting reactant is the substance that is added in excess to ensure complete reaction

• Limiting reactant is the substance that is completely consumed in a chemical reaction, limiting the amount of product that can be formed.

Give an example of a chemical reaction and describe the changes that occur.

• Oxygen and nitrogen combining to form carbon dioxide

• Hydrogen and oxygen combining to form water

• Sodium and chlorine combining to form carbon dioxide

• Carbon dioxide and nitrogen combining to form water