2026 HESI A2 Chemistry
Latest Update
What makes an atom's physical structure? -Answer--A nucleus and orbits(sometimes
known as electron clouds)
What composes the center of the atom? -Answer--Protons and neutrons
What spins in the orbits of an atom? -Answer--Electrons
What are the energy levels of the atom called? -Answer--Shells or orbits
What is the term used to define an atom that is electrically charged? -Answer--Ionic
state.
What is a cation? -Answer--An atom with a positive charge
What is anion? -Answer--An atom with a negative charge
What is the structure of the periodic table? -Answer--A series of rows called periods,
and columns called groups.
What can be predicted by the group an element occupies? -Answer--Charge and the
numbers of electrons in its outer shell.
What is the name and properties of group VIII of the periodic table? -Answer--Noble
gases.
They tend to remain neutral in most situations, because their outer orbits are
complete.
What is the atomic number? -Answer--The number of protons in the nucleus, defines
an atom of a particular element.
What is the atomic mass? -Answer--The average mass of an element's isotopes.
, What are isotopes? -Answer--Different kinds of the same atom that vary in weight.
What is a compound? -Answer--The combination of different elements.
What do chemical reactions resemble? -Answer--A cooking recipe.
What are the reactants in a chemical reaction? -Answer--The ingredients of a
chemical reaction.
What is the term given to the results of a chemical reaction? -Answer--The products.
Why must a chemical equation be balanced at the end of a reaction?
-Answer--Because the law of conservation of mass indicates that mass cannot be
created nor destroyed in a chemical reaction.
What are equilibrium reactions? -Answer--Chemical reactions that stop before all the
reactants are used to make the products.
What causes equilibrium? -Answer--The state in which reactants are forming
products at the same rate that products are forming reactants.
What are the four basic ways to increase the reaction rate? -Answer--Increase
temperature
Increase the surface area of the reactants
Add a catalyst
Increase the concentration of the reactants.
What does increasing temperature cause in a chemical reaction? -Answer--The
particles have greater kinetic energy, increasing the speed at which they move
around, and the chance of collision between particles.
How does increasing the surface area of the particles in a reaction speed chemical
reactions? -Answer--Gives the Particles more opportunities to come in contact with
each other.
What is a catalyst? -Answer--An agent that accelerates a chemical reaction by
reducing the activation energy or the amount of energy necessary for a reaction to
occur.
What is the effect of increasing the concentration of reactants in a chemical
reaction? -Answer--More chance collisions occur between the reactants, producing
more products.
Latest Update
What makes an atom's physical structure? -Answer--A nucleus and orbits(sometimes
known as electron clouds)
What composes the center of the atom? -Answer--Protons and neutrons
What spins in the orbits of an atom? -Answer--Electrons
What are the energy levels of the atom called? -Answer--Shells or orbits
What is the term used to define an atom that is electrically charged? -Answer--Ionic
state.
What is a cation? -Answer--An atom with a positive charge
What is anion? -Answer--An atom with a negative charge
What is the structure of the periodic table? -Answer--A series of rows called periods,
and columns called groups.
What can be predicted by the group an element occupies? -Answer--Charge and the
numbers of electrons in its outer shell.
What is the name and properties of group VIII of the periodic table? -Answer--Noble
gases.
They tend to remain neutral in most situations, because their outer orbits are
complete.
What is the atomic number? -Answer--The number of protons in the nucleus, defines
an atom of a particular element.
What is the atomic mass? -Answer--The average mass of an element's isotopes.
, What are isotopes? -Answer--Different kinds of the same atom that vary in weight.
What is a compound? -Answer--The combination of different elements.
What do chemical reactions resemble? -Answer--A cooking recipe.
What are the reactants in a chemical reaction? -Answer--The ingredients of a
chemical reaction.
What is the term given to the results of a chemical reaction? -Answer--The products.
Why must a chemical equation be balanced at the end of a reaction?
-Answer--Because the law of conservation of mass indicates that mass cannot be
created nor destroyed in a chemical reaction.
What are equilibrium reactions? -Answer--Chemical reactions that stop before all the
reactants are used to make the products.
What causes equilibrium? -Answer--The state in which reactants are forming
products at the same rate that products are forming reactants.
What are the four basic ways to increase the reaction rate? -Answer--Increase
temperature
Increase the surface area of the reactants
Add a catalyst
Increase the concentration of the reactants.
What does increasing temperature cause in a chemical reaction? -Answer--The
particles have greater kinetic energy, increasing the speed at which they move
around, and the chance of collision between particles.
How does increasing the surface area of the particles in a reaction speed chemical
reactions? -Answer--Gives the Particles more opportunities to come in contact with
each other.
What is a catalyst? -Answer--An agent that accelerates a chemical reaction by
reducing the activation energy or the amount of energy necessary for a reaction to
occur.
What is the effect of increasing the concentration of reactants in a chemical
reaction? -Answer--More chance collisions occur between the reactants, producing
more products.
