HESI CHEMISTRY NEWEST VERSION 2024-2025 130 QUESTION
AND CORRECT ANSWER FROM VERIFIED SOURCES RATED A
GRADE.
What makes an atom's physical structure? ✔✔CORRECT ANSWER✔✔A
nucleus and orbits(sometimes known as electron clouds)
What composes the center of the atom? ✔✔CORRECT ANSWER✔✔Protons
and neutrons
What spins in the orbits of an atom? ✔✔CORRECT ANSWER✔✔Electrons
What are the energy levels of the atom called? ✔✔CORRECT
ANSWER✔✔Shells or orbits
What is the term used to define an atom that is electrically charged?
✔✔CORRECT ANSWER✔✔Ionic state.
What is a cation? ✔✔CORRECT ANSWER✔✔An atom with a positive charge
What is anion? ✔✔CORRECT ANSWER✔✔An atom with a negative charge
What is the structure of the periodic table made of? ✔✔CORRECT
ANSWER✔✔A series of rows called periods, and columns called groups.
,What can be predicted by the group an element occupies? ✔✔CORRECT
ANSWER✔✔Charge and the numbers of electrons in its outer shell.
What is the name and properties of group VIII of the periodic table?
✔✔CORRECT ANSWER✔✔Noble gases.
They tend to remain neutral in most situations, because their outer orbits
are complete.
What is the atomic number? ✔✔CORRECT ANSWER✔✔The number of
protons in the nucleus, defines an atom of a particular element.
What is the atomic mass? ✔✔CORRECT ANSWER✔✔The average mass of an
element's isotopes.
What are isotopes? ✔✔CORRECT ANSWER✔✔Different kinds of the same
atom that vary in weight.
What is a compound? ✔✔CORRECT ANSWER✔✔The combination of
different elements.
What do chemical reactions resemble? ✔✔CORRECT ANSWER✔✔A cooking
recipe.
, What are the reactants in a chemical reaction? ✔✔CORRECT
ANSWER✔✔The ingredients of a chemical reaction.
What is the term given to the results of a chemical reaction? ✔✔CORRECT
ANSWER✔✔The products.
Why must a chemical equation be balanced at the end of a reaction?
✔✔CORRECT ANSWER✔✔Because the law of conservation of mass indicates
that mass cannot be created nor destroyed in a chemical reaction.
What are equilibrium reactions? ✔✔CORRECT ANSWER✔✔Chemical
reactions that stop before all the reactants are used to make the products.
What causes equilibrium? ✔✔CORRECT 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? ✔✔CORRECT
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?
✔✔CORRECT ANSWER✔✔The particles have greater kinetic energy,
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