Chemical Reactions Quiz

What is the term for substances to the right of the arrow in a chemical equation?

• Catalyst

• Product

• Reactant

• Inhibitor

What are the numbers called that appear before symbols and formulas in chemical equations?

• Superscripts

• Subscripts

• Catalysts

• Coefficients

What are substances that accelerate chemical reactions known as?

• Inhibitors

• Products

• Reactants

• Catalysts

What type of chemical equation has an equal number of atoms for each element on both sides?

• Unbalanced

• Balanced

• Simple

• Complex

What type of reaction occurs when something is burned?

• Double displacement

• Single displacement

• Combustion

• Synthesis

How does an increase in temperature affect the reaction rate?

• Raises the activation energy

• Causes molecules to increase in size

• Decreases the concentration of reactants

• Increases the rate of particle collisions

Identify the type of reaction for CH3CH2OH + 3O2 -> 2CO2 + 3H2O.

• Double-displacement

• Single-displacement

• Combustion

• Synthesis

Which equation represents a double displacement reaction?

• 2Na + Cl2 -> 2NaCl

• 2KClO3 -> 2KCl + 3O2

• Zn + 2HCl -> ZnCl2 + H2

• NaOH + HCl -> NaCl + H2O

Which demonstration best illustrates a chemical reaction?

• Placing metal in an acid to create gas

• Measuring the densities of water and ice

• Melting a solid piece of aluminum

• Filling a balloon with helium gas

What type of reaction occurs when wood burns and releases heat?

• Endothermic

• Exothermic

• Endergonic

• Exergonic