Chemistry Basics Quiz

The symbol Δ in a chemical equation means:

• heat is supplied to the reaction.

• a catalyst is needed.

• yields.

• precipitate.

A catalyst is:

• a solid product of a reaction.

• one of the reactants in a single-replacement reaction.

• not used up in a reaction.

• the product of a combustion reaction.

When the equation Fe + O₂ → Fe₂O₃ is balanced, the coefficient for O₂ is:

• 4

• 3

• 2

• 1

Tags

NGSS.HS-PS1-7

The equation H₃PO₄ + 3KOH → K₃PO₄ + 3H₂O is an example of which type of reaction?

• double-replacement

• combination

• decomposition

• single-replacement

In a double-replacement reaction:

• the reactants are usually a metal and a nonmetal.

• the reactants are generally two ionic compounds in aqueous solution.

• one of the reactants is often water.

• energy in the form of heat or light is always produced.

In order for the reaction 2Al(s) + 6HCl(aq) → 2AlCl₃(aq) + 3H₂(g) to occur, which of the following must be true?

• Al must be above Cl on the activity series.

• Al must be above H on the activity series.

• Heat must be supplied for the reaction.

• AlCl₃ must be a precipitate.

Tags

NGSS.HS-PS1-1

In a double-replacement reaction:

• one of the products is always a gas.

• one of the products must be an element.

• positive ions are exchanged between two compounds.

• all of the above

When the following equation is balanced, the coefficient in front of HCl is: Ba(s) + HCl(aq) → BaCl₂(aq) + H₂(g)

• 6

• 3

• 1

• 2

Tags

NGSS.HS-PS1-7

This symbol ⇌ indicates:

• that heat must be applied.

• an incomplete combustion reaction.

• that a gas is formed by the reaction.

• that the reaction is reversible.

Tags

NGSS.HS-PS1-6

Which of the following statements is incorrect?

• Complete combustion has occurred when all the carbon in the product is in the form of carbon dioxide.

• A single reactant is the identifying characteristic of a decomposition reaction.

• The only way to determine the products of a reaction is to perform the reaction.

• All chemical reactions can be classified as one of four general types.