Chemical Reactions

What is a balanced chemical equation?

• A chemical equation that has unequal numbers of atoms on both sides.

• An equation that shows the reactants and products with equal numbers of each type of atom on both sides.

• A representation of a chemical reaction that does not require balancing.

• An equation that only includes the products of a reaction.

Tags

NGSS.MS-PS1-5

How do you determine the mass of products formed in a reaction?

• By measuring the volume of reactants used

• By using the law of conservation of mass, which states that the total mass of reactants equals the total mass of products.

• By calculating the temperature change during the reaction

• By estimating based on the appearance of the products

Tags

NGSS.MS-PS1-5

What does it mean for a chemical equation to be balanced?

• A balanced chemical equation has different numbers of atoms on each side, indicating mass is lost during the reaction.

• A balanced chemical equation has the same number of each type of atom on both sides, indicating that mass is conserved during the reaction.

• A balanced chemical equation can have varying types of atoms on each side, showing that reactions are not always equal.

• A balanced chemical equation is one that includes only solid reactants and products.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-5

What is stoichiometry in chemistry?

• Stoichiometry is the calculation of reactants and products in chemical reactions based on the balanced equation.

• Stoichiometry is the study of the properties of gases under different conditions.

• Stoichiometry refers to the measurement of temperature in chemical reactions.

• Stoichiometry is the process of balancing chemical equations.

Tags

NGSS.MS-PS1-5

What is the law of conservation of mass?

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

• Mass remains constant in a closed system but can change forms.

• Mass can be converted into energy during a chemical reaction.

• Mass cannot be created or destroyed in a chemical reaction; it can only change forms.

Tags

NGSS.MS-PS1-5

What are products in a chemical reaction?

• Substances that are consumed during the reaction.

• Substances that are formed as a result of a chemical reaction.

• Substances that act as catalysts in the reaction.

• Substances that remain unchanged during the reaction.

Tags

NGSS.MS-PS1-5

What are reactants in a chemical reaction?

• Substances that are produced in a chemical reaction.

• Starting materials that undergo change to form products.

• Elements that are combined to create a new substance.

• The energy required to initiate a chemical reaction.

Tags

NGSS.MS-PS1-1

How can you identify the type of reaction occurring?

• By analyzing the reactants and products, as well as the energy changes involved.

• By observing the color change of the reactants.

• By measuring the temperature of the reaction mixture.

• By counting the number of reactants present.

Tags

NGSS.MS-PS1-2

What is a chemical reaction?

• A process where substances are created from nothing.

• A process in which one or more substances are converted into one or more different substances through the breaking and forming of chemical bonds.

• A method of mixing ingredients without any change in their properties.

• A reaction that only occurs in living organisms.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

What is an example of a simple chemical reaction?

• The combustion of methane: CH₄ + 2O₂ → CO₂ + 2H₂O.

• The rusting of iron: 4Fe + 3O₂ → 2Fe₂O₃.

• The electrolysis of water: 2H₂O → 2H₂ + O₂.

• The reaction of vinegar and baking soda: CH₃COOH + NaHCO₃ → CO₂ + H₂O + NaCH₃COO.

Tags

NGSS.MS-PS1-2