Introduction to Chemical Equations and Reactions

After the correct formula for a reactant in an equation has been written, the—

• chemical formula cannot be altered

• subscripts of the formula are changed to balance the equation

• chemical symbols in the formula must appear only on the reactant side

• same chemical formula must be written on the product side of the equation

Tags

NGSS.HS-PS1-7

Which equation represents a precipitation reaction?

• H₂CO_{3 (aq)} --> CO_{2 (g)} + H₂O _(l)

• H₂SO_{4 (aq)} + 2NaOH _(aq) --> Na₂SO_{4 (aq)} + 2H₂O _(l)

• 2H_{2 (g)} + O_{2 (g)} --> 2H₂O_(l)

• AgNO_{3 (aq)} + NaOH _(aq) --> AgOH _(s) + NaNO_3(aq)

Which of the following reactions involves two or more substances combining to form a single compound?

• Single-replacement reaction

• Synthesis reaction

• Decomposition reaction

• Combustion reaction

Which of the following reactions involves one element replacing an element in a compound that is from the same activity series?

• Combustion reaction

• Decomposition reaction

• Single-replacement reaction

• Double-replacement reaction

Which of the following reactions involves the ions of two compounds exchanging places to form two new compounds?

• Synthesis reaction

• Single-replacement reaction

• Double-replacement reaction

• Combustion reaction

Which of the following reactions involves a single compound producing two or more simpler substances?

• Synthesis reaction

• Decomposition reaction

• Combustion reaction

• Double-replacement reaction

By predicting the outcome of the following reactants mixing together in an aqueous solution, what type of reaction will take place?

Pb(NO₃)₂ (aq) + 2 KI (aq) →

• Double-replacement reaction

• Synthesis reaction

• Decomposition reaction

• Single-replacement reaction

When an acid, such as carbonic acid, decomposes, the products are —

• non-metal oxides and a salt

• non-metal oxides and water

• metal oxides and oxygen

• metal oxides and peroxide

Predict the outcome of the reaction where zinc metal is added to a solution of potassium chloride.

• No reaction occurs.

• Gaseous zinc is formed.

• Potassium calcide forms.

• Zinc chloride forms.

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2

Predict the products of the following reaction:

Na₂O + CO₂ →

• Na₂CO₃

• Na + CO₃

• NaCO₂ + O₂

• NaC + O₃

Tags

NGSS.HS-PS1-1

NGSS.HS-PS1-2