PSU CHEM 111 Test Questions Fully
Solved 2025-2026 Updated.
Accuracy - Answer The closeness of a measurement to the true value of the quantity
measured
Actual Yield - Answer the measured amount of a product obtained from a reaction
Anion - Answer An ion with a net negative charge
Atom - Answer The smallest piece of an element that can enter into chemical combinations
Buffer Solution - Answer A solution that has the ability ti resist small changes in pH upon the
addition of small amounts of acid or base
Catalyst - Answer A substance that increases the rate of a chemical reaction without itself
being consumed
Cation - Answer An ion with a net positive charge
Chemical Reaction - Answer Process in which one or more substances are converted into
other substances
Chemical Kinetics - Answer The area of chemistry concerned with the speeds at which
chemical reactions occur
Compound - Answer A substance composed of atoms of two or more elements chemically
united in fixed proportions
Covalent Bond - Answer A bond in which two electrons are shared by two atoms
Density - Answer The mass of a substance divided by its volume
, Dilution - Answer A procedure for preparing a less concentrated solution from a more
concentrated solution
Electrolyte - Answer When dissolved in water, a solution results that can conduct electricity
Electronegativity - Answer The ability of an atom to attract electrons toward itself in a
chemical bond
Element - Answer A substance that cannot be separated into simpler substances by chemical
means
Endothermic Process - Answer Processes that absorb heat from the surroundings
Energy - Answer The capacity to do work
Enzyme - Answer A biological catalyst
Equilibrium - Answer A state in which there are no observable changes as time goes by
Excess reagents - Answer One or more reactants present in quantities greater than those
needed to react with the quantity of the limiting reagent
Exothermic Processes - Answer Process that gives off heat to the surroundings
Full Ionic Equation - Answer A reaction equation that shows all soluble compounds in the
ionic forms
Heat - Answer The transfer of thermal energy between two bodies that are at different
temperatures
Hess's Law - Answer When reactants are converted to products, the change in enthalpy is
the same whether the reaction takes place in one step or in a series of steps
Solved 2025-2026 Updated.
Accuracy - Answer The closeness of a measurement to the true value of the quantity
measured
Actual Yield - Answer the measured amount of a product obtained from a reaction
Anion - Answer An ion with a net negative charge
Atom - Answer The smallest piece of an element that can enter into chemical combinations
Buffer Solution - Answer A solution that has the ability ti resist small changes in pH upon the
addition of small amounts of acid or base
Catalyst - Answer A substance that increases the rate of a chemical reaction without itself
being consumed
Cation - Answer An ion with a net positive charge
Chemical Reaction - Answer Process in which one or more substances are converted into
other substances
Chemical Kinetics - Answer The area of chemistry concerned with the speeds at which
chemical reactions occur
Compound - Answer A substance composed of atoms of two or more elements chemically
united in fixed proportions
Covalent Bond - Answer A bond in which two electrons are shared by two atoms
Density - Answer The mass of a substance divided by its volume
, Dilution - Answer A procedure for preparing a less concentrated solution from a more
concentrated solution
Electrolyte - Answer When dissolved in water, a solution results that can conduct electricity
Electronegativity - Answer The ability of an atom to attract electrons toward itself in a
chemical bond
Element - Answer A substance that cannot be separated into simpler substances by chemical
means
Endothermic Process - Answer Processes that absorb heat from the surroundings
Energy - Answer The capacity to do work
Enzyme - Answer A biological catalyst
Equilibrium - Answer A state in which there are no observable changes as time goes by
Excess reagents - Answer One or more reactants present in quantities greater than those
needed to react with the quantity of the limiting reagent
Exothermic Processes - Answer Process that gives off heat to the surroundings
Full Ionic Equation - Answer A reaction equation that shows all soluble compounds in the
ionic forms
Heat - Answer The transfer of thermal energy between two bodies that are at different
temperatures
Hess's Law - Answer When reactants are converted to products, the change in enthalpy is
the same whether the reaction takes place in one step or in a series of steps
