Think about what chemical reactions are required to launch the rocket. There is no right or wrong answer, respond what you think for this phenomemon video.

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The energy released when kerosene and oxygen molecules react to form carbon dioxide and water comes from:

• The breaking of chemical bonds in kerosene and oxygen

• The formation of chemical bonds in carbon dioxide and water

• The increase in temperature during the reaction

• The movement of molecules

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What are the substances present before a chemical reaction called?

• Products

• Reactants

• Equations

• Compounds

In the word equation 'Iron + Oxygen → Iron(III) oxide', what is the product?

• Iron(III) oxide.

• Iron(II) oxide.

• Iron(IV) oxide.

• Iron oxide.

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How are word and skeleton equations used to represent chemical reactions?

• Word equations use words to describe the reactants and products, while skeleton equations use chemical formulas.

• Word equations use chemical formulas, while skeleton equations use words to describe the reactants and products.

• Both word and skeleton equations use chemical formulas to describe the reactants and products.

• Neither word nor skeleton equations are used to represent chemical reactions.

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NGSS.MS-PS1-2

3. Write the skeleton equation for the iron and diatomic oxygen gas reaction to form iron(III) oxide (Fe2O3). Sketch a molecular model of the reactants and products in the reaction.

• 3Fe + 2O2 -> Fe3O4
• Fe + O2 -> Fe2O3

• 4Fe + O2 -> 2Fe2O3
• 2Fe + 3O2 -> Fe2O3

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Write the skeleton equation for the reaction of iron and diatomic oxygen gas to form iron(III) oxide (Fe2O3).

• Fe + O2 → Fe2O3

• 4Fe + 3O2 → 2Fe2O3

• 2Fe + O2 → Fe2O3

• 3Fe + 2O2 → Fe2O3

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NGSS.MS-PS1-5

What does the symbol '+' represent in chemical equations?

• Separates two reactants or two products

• Indicates heat is supplied

• Designates an aqueous solution

What does the symbol '→' mean in a chemical equation?

• A) Shows that the reaction is reversible

• B) 'Yields'; separates reactants from products

• C) Designates a reactant in the solid state.

Fill in the blank: The symbol '⇌' shows that the reaction is ______ and can go in either direction.

• reversible.

• irreversible.

• unidirectional.

• static.

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