T2.3 Modeling Chemical Reaction

What is a chemical equation?

• A. A way to describe a chemical reaction using symbols instead of words.

• B. A way to describe a chemical reaction using words instead of symbols.

• C. A way to describe a physical change using symbols instead of words.

• D. A way to describe a physical change using words instead of symbols.

What is the chemical formula for water?

• H2O2

• H2O

• HO2

• H2

Tags

NGSS.MS-PS1-1

What is the general structure of a chemical equation?

• Reactant + Product → Reactant + Product

• Product + Reactant → Reactant + Product

• Reactant + Reactant → Product + Product

• Product + Product → Reactant + Reactant

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NGSS.MS-PS1-1

NGSS.MS-PS1-2

In the given chemical equation, what are the reactants?

• N2 and NH3

• H2 and NH3

• N2 and H2

• NH3 and H2

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NGSS.MS-PS1-2

NGSS.MS-PS1-5

In the given chemical equation, what are the products?

• N2 and NH3

• H2 and NH3

• N2 and H2

• NH3

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In the chemical reaction CH₄ + 2O₂ → CO₂ + 2H₂O, what are the reactants?

• CH₄ and O₂

• CO₂ and H₂O

• CH₄ and H₂O

• CO₂ and O₂

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

How many molecules of oxygen (O₂) are required in the reaction CH₄ + 2O₂ → CO₂ + 2H₂O?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-5

What does the Law of Conservation of Mass state?

• Matter is created during a chemical reaction.

• Matter is destroyed during a chemical reaction.

• Matter is neither created nor destroyed during a chemical reaction.

• Matter is both created and destroyed during a chemical reaction.

Tags

NGSS.MS-PS1-5

Which of the following best describes the Law of Conservation of Mass?

• The total mass of reactants is always less than the total mass of products.

• The total mass of reactants is always more than the total mass of products.

• The total mass of reactants is equal to the total mass of products.

• The total mass of reactants and products cannot be compared.

Tags

NGSS.MS-PS1-5

During a chemical reaction, what happens to matter according to the Law of Conservation of Mass?

• It is created.

• It is destroyed.

• It remains unchanged in quantity.

• It changes in quantity.

Tags

NGSS.MS-PS1-5