Reactants and Products Lesson

The following chemical equations represent three different chemical reactions.

3NaOH + H₃PO₄ → Na₃PO₄ + 3H₂O

2Mg + O₂ → 2MgO

Pb(NO₃)₂ + 2NaI → PbI₂ + 2NaNO₃

_{Which Statement is correct choose the best answer}

• MgO is a reactant in one of the chemical reactions.

• Na₃PO₄ is a product in one of the chemical reactions.

• A total of five oxygen atoms are involved in the first reaction.

• H₃PO₄ shows that three atoms of oxygen are involved in the reaction.

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The substances listed on the right side of a chemical equation are the

• Yields

• Reactants

• Products

• Precipitates

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In chemical reactions, what does the principle of conservation of mass mean?

• Matter is not created or destroyed.

• The total mass of the reactants is greater than the total mass of the products.

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

• Matter is not changed.
  

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Chemical reactions happen when:

• The atoms grow until a substance changes state.

• The products break apart into different substances

• The atoms rearrange themselves to form new reactants.

• The bonds between atoms in reactants break and reform to make new substances.

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Electrolysis of water (H₂O) produces which two substances?

• O₁₂ and H₁₂

• N₂ and H₂

• O₂₂ and N₁₁

• O₂ and H₂

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Which of these is NOT true of a chemical equation?

• The reactants are on the left side of the equation.

• The products are on the right side of the equation.

• The two sides of the equation have different types and numbers of atoms.

• There may be more than one reactant and more than one product.

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A whole number to the left (Coefficient) of a formula tells:

• Volume of a substance.

• The average number of molecules.

• How many times a substance has undergone a chemical reaction.

• How many molecules of that substance are involved in a reaction.

What happens during a chemical reaction where molecules break apart? They will:

• Dissolve into their original elements.

• Form new groups of atoms that make new substances.

• Completely dissolve into the environment.

• Make a copy with the atoms of another molecule.

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Based on our discussion in class, which of these is a chemical equation that demonstrates the combination (synthesis) atoms of multiple substances?

• 2H₂O -> 2H₂ + O₂

• 2H₂O₂ -> 2H₂O + O₂

• 4Fe + 3O₂ -> 2Fe₂O₃

• Pb(NO₃)2 + 2KI -> PbI₂ + 2KNO₃

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If there are 10 atoms in the reactants prior to chemical reaction, how many atoms will be in

the products?

• 5 atoms

• 10 atoms

• 500 atoms

• 1000 atoms

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