Regents Review 3- Reactions

Which of the following concepts is FALSE?

• Gram formula mass is the sum of the element masses in a chemical formula.

• Molar mass is another term for gram formula mass.

• Gram formula mass is the mass of 1 mole of a substance.

• The periodic table contains the molar mass for each element in the bottom left corner of each box.

Which of the following chemistry concepts is FALSE?

• A chemical equation has reactants on the left side of the arrow.

• A chemical equation is balanced when the amount of elements in the reactants is greater than the amount of elements in the products.

• Conservation of mass states that the total mass of the reactants must be equal to the total mass of the products.

• We put coefficients in front of substances in a chemical equation to balance it.

Which of the following chemistry concepts is FALSE?

• Exothermic reactions absorb energy.

• Exothermic reactions have energy as a product.

• Endothermic reactions have energy as a reactant.

• Endothermic reactions means the energy of the products is greater than the energy of the reactants.

Which of the following chemistry concepts is FALSE?

• The activation energy is the amount of energy it takes for a reaction to occur.

• The heat of reaction is the energy of the reactants minus the energy of the products.

• A negative heat of reaction shows an exothermic reaction.

• A positive heat of reaction shows an endothermic reaction.

Which of the following chemistry concepts is FALSE?

• When a bond breaks, energy needs to be absorbed.

• When a bond is formed, energy is released.

• An effective collision requires a sufficient amount of energy, but the positioning of particles does not matter.

• The more particle collisions there are, the faster the reaction rate.

Which of the following chemistry concepts is FALSE?

• Equilibrium occurs when the rate of the forward and reverse reactions are equal.

• Equilibrium occurs when the amount of reactants is equal to the amount of products.

• Equilibrium occurs when the concentrations of both reactants and products are constant.

• Dynamic equilibrium means that the forward and reverse reactions are both occurring simultaneously.

Which of the following chemistry concepts is FALSE?

• Increasing the temperature will increase the speed of a chemical reaction.

• Increasing the concentration of reactants will speed up a chemical reaction.

• Increasing the pressure of gases only will speed up a chemical reaction.

• Increasing the surface area of the substances will decrease the speed of a chemical reaction.

Which of the following chemistry concepts is FALSE?

• Synthesis reaction is

  A + B --> B + A

• Decomposition reaction is

  AB --> A + B

• Single replacement reaction is

  AB + C --> CB + A

• Double replacement reaction is

  AB + CD --> AD + BC

Which of the following chemistry concepts is FALSE?

• Molarity is the moles of solution per liter (mol/L).

• Parts per million (ppm) is a unit of concentration.

• Molarity is a unit of volume.

• Titration is the process of determining an unknown concentration of an acid or base.

Which of the following chemistry concepts is FALSE?

• An acid is a proton donor.

• A base is a proton acceptor.

• A base produces hydronium ions.

• An acid produces H₃O⁺ ions.