Unit 8: Reactions & Equations Check for Understanding

Identify the reactants and products in the following chemical equation: H2 + O2 -> H2O

• H2 and O2 are the reactants, and H2O is the product.

• H and O2 are the reactants, and H2O is the product.

• H and O are the reactants, and H2O2 is the product.

• H2O and O2 are the reactants, and H2 is the product.

Tags

NGSS.MS-PS1-1

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Identify the reactants and products in the following chemical equation: Fe + O2 -> Fe2O3

• Fe and O2 are the reactants, and Fe2O3 is the product.

• Fe2O3 and Fe are the products, and O2 is the reactant.

• Fe2O3 and Fe are the reactants, and O2 is the product.

• Fe2O3 and O2 are the reactants, and Fe is the product.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Identify the reactants and products in the following chemical equation: NaCl + AgNO3 -> AgCl + NaNO3

• NaCl + AgNO3 are the reactants, and AgCl + NaNO3 are the products.

• AgCl + NaNO3 are the reactants, and NaCl + AgNO3 are the products.

• AgNO3 + AgCl are the reactants, and NaCl + NaNO3 are the products.

• NaCl + AgNO3 are the products, and AgCl + NaNO3 are the reactants.

Tags

NGSS.MS-PS1-2

Balance the following chemical equation: H2 + O2 -> H2O

• 2H2 + O2 -> 2H2O

• H2O2 -> H2 + O2

• H2 + O2 -> H2O2

• 2H2O -> H2 + O2

Tags

NGSS.MS-PS1-5

Balance the following chemical equation: Fe + O2 -> Fe2O3

• FeO + O -> Fe2O3

• 2Fe + 3O2 -> 2Fe2O3

• 2Fe + 3O2 -> Fe3O2

• Fe2 + O3 -> FeO2

Tags

NGSS.MS-PS1-5

Balance the following chemical equation: Na + Cl2 -> NaCl

• 2Na + Cl2 -> 2NaCl

• Na + Cl2 -> NaCl2

• 3Na + Cl2 -> Na2Cl2

• 2Na + Cl2 -> Na2Cl

Tags

NGSS.MS-PS1-5

What type of chemical reaction is represented by the following equation: 2H2 + O2 -> 2H2O

• Synthesis reaction

• Combustion reaction

• Single displacement reaction

• Decomposition reaction

What type of chemical reaction is represented by the following equation: 2HgO  —>  2Hg  +  O2

• Decomposition reaction

• Synthesis or combination reaction

• Double displacement reaction

• Single displacement reaction

Using the law of conservation of mass, explain why it is important to balance chemical equations.

• To make the equation look more balanced

• To ensure that the same number of each type of atom is present on both sides of the equation.

• To change the type of atoms in the equation

• To ensure that the equation is more difficult to solve

Tags

NGSS.MS-PS1-5

Explain how the law of conservation of mass is applied when balancing chemical equations.

• By ignoring the number of atoms on each side of the equation

• By adding or removing atoms from the equation

• By changing the number of atoms on one side of the equation

• By ensuring that the same number of each type of atom is present on both sides of the equation.

Tags

NGSS.MS-PS1-5