Chemistry: Chemical Reactions

What is a chemical reaction?

• A chemical reaction is a process that involves only one chemical substance.

• A chemical reaction is a process that does not involve any change in properties of substances.

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

• A chemical reaction is a process that leads to the transformation of physical substances.

What are the different types of chemical reactions?

• Addition, subtraction, multiplication, division

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

• Oxidation, reduction, neutralization

• Solidification, liquidation, gasification

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

• The law of conservation of mass applies to chemical reactions by ensuring that the total mass of the reactants is equal to the total mass of the products.

• The law of conservation of mass only applies to physical changes, not chemical reactions.

• In chemical reactions, the law of conservation of mass states that the total mass of the reactants is always less than the total mass of the products.

• The law of conservation of mass allows for the creation of matter in chemical reactions.

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NGSS.HS-PS1-7

Explain the difference between exothermic and endothermic reactions.

• Exothermic reactions release energy, while endothermic reactions absorb energy.

• Exothermic reactions are slower than endothermic reactions

• Endothermic reactions release energy

• Exothermic reactions absorb energy

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NGSS.HS-PS1-4

What is a catalyst in the context of chemical reactions?

• A catalyst is a substance that slows down 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 the reactants into products

• A catalyst is a substance that is consumed during a chemical reaction

Describe the process of balancing a chemical equation.

• The process of balancing a chemical equation involves adjusting the coefficients of the compounds to ensure the same number of atoms of each element on both sides of the equation.

• The process of balancing a chemical equation ensures the reactants and products are different

• Balancing a chemical equation involves changing the chemical formula of the compounds

• Balancing a chemical equation requires adding or removing elements from the compounds

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NGSS.HS-PS1-7

What are the key components of a chemical equation?

• Molecules, Compounds, Coefficients, Chemical Reaction Arrow

• Reactants, Products, Coefficients, Chemical Reaction Arrow

• Reactants, Products, Equations, Chemical Formula

• Substances, Elements, Coefficients, Chemical Reaction Arrow

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NGSS.MS-PS1-5

How do you identify the reactants and products in a chemical reaction?

• Analyze the chemical equation to determine the substances present at the beginning (reactants) and those formed as a result (products).

• Ask a friend to guess

• Count the number of atoms in each substance

• Look for the most colorful substance

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is a reversible reaction and give an example.

• Nitrogen gas + Oxygen gas ⇌ Nitrogen dioxide gas

• Oxygen gas + Hydrogen gas ⇌ Water vapor

• Hydrogen gas + Iodine gas ⇌ Hydrogen Iodide gas

• Carbon dioxide gas + Water ⇌ Carbonic acid

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NGSS.HS-PS1-6

Explain the concept of limiting reactants in a chemical reaction.

• Limiting reactants are the reactants that are not involved in the reaction.

• Limiting reactants are the reactants that are in excess in a chemical reaction.

• Limiting reactants are the reactants that speed up the reaction.

• The concept of limiting reactants in a chemical reaction refers to the reactant that is completely consumed first, limiting the amount of product that can be formed.