HESI A2 CHEMISTRY EXAM QUESTIONS AND
CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) |ALREADY GRADED A+
Mixture with uniform density throughout and no distinguishable coponents. - ans
-Homogeneous Mixture
The emission of particle sfrom an unstable nucleus. Exists in three forms alpha,
beta, and gama radiation. - ans -Radioactivity
The mass of one mole of a compound. - ans -Molar mass
When a substance changes from a solid to a gas without first becoming a liquid. -
ans -Sublimation
PV=nRT (n is equal to the number of moles of the substance and R is the gas
constant 0.082) - ans -Ideal gas law
The number of moles of solute in 1 liter of solution. - ans -Molarity
Reactions that involve the transfer of electrons from one element to another. -
ans -Redox Reactions
The loss of electrons in an redox reaction. - ans -Oxidation
The gain of electrons in a redox reaction. - ans -Reduction
Rules for determining oxidation state. - ans -1. Elemental atoms have an oxidation
number of zero.
2. The oxidation number of any simple ion is the charge of the ion.
3. The oxidation number for oxygen in compound is always -2.
4. The oxidation number for hydrogen in compound is +1.
5. The sum of the oxidation numbers equals the charge on the molecule or
polyatomic ions.
5 Facts about Acids - ans -1. Proton donors
, 2. Produce H3O+
3. Most of their formulas begin with H
4. pH is less than 7
3 Facts about Bases - ans -1. Proton acceptors
2. Produce OH-
3. pH is greater than 7
Process which occurs when an acid and a base react to produce a salt and water.
The result is a pH near 7. - ans –Neutralization
Mixture in which the components are readily distinguished. - ans -Heterogeneous
Mixture
A change in which the checmical composition of a substance remains the same. -
ans -Physical Change
A change in which the chemical bonds are broken and reformed to create a new
and different substance. - ans -Chemical Change
The simplest of substances and is represented by a specific letter or combinations
of letters. - ans -Element
Combinations of eleements in whole number ratios. - ans -Compounds
Mass cannot be created or destroyed during a chemical reaction. - ans -Law of
Conservation of Mass
The breaking of bonds and the reforming of new bonds to create new chemical
compounds with different chemical forumulas and different chemical properties. -
ans -Chemical Reaction
syntehesis, decomposition, combusion, single replacement, double replacement -
ans -Five main types of chemical reactions.
Two elements combine to form a product. - ans -Syntehsis Reaction
CORRECT DETAILED ANSWERS (VERIFIED
ANSWERS) |ALREADY GRADED A+
Mixture with uniform density throughout and no distinguishable coponents. - ans
-Homogeneous Mixture
The emission of particle sfrom an unstable nucleus. Exists in three forms alpha,
beta, and gama radiation. - ans -Radioactivity
The mass of one mole of a compound. - ans -Molar mass
When a substance changes from a solid to a gas without first becoming a liquid. -
ans -Sublimation
PV=nRT (n is equal to the number of moles of the substance and R is the gas
constant 0.082) - ans -Ideal gas law
The number of moles of solute in 1 liter of solution. - ans -Molarity
Reactions that involve the transfer of electrons from one element to another. -
ans -Redox Reactions
The loss of electrons in an redox reaction. - ans -Oxidation
The gain of electrons in a redox reaction. - ans -Reduction
Rules for determining oxidation state. - ans -1. Elemental atoms have an oxidation
number of zero.
2. The oxidation number of any simple ion is the charge of the ion.
3. The oxidation number for oxygen in compound is always -2.
4. The oxidation number for hydrogen in compound is +1.
5. The sum of the oxidation numbers equals the charge on the molecule or
polyatomic ions.
5 Facts about Acids - ans -1. Proton donors
, 2. Produce H3O+
3. Most of their formulas begin with H
4. pH is less than 7
3 Facts about Bases - ans -1. Proton acceptors
2. Produce OH-
3. pH is greater than 7
Process which occurs when an acid and a base react to produce a salt and water.
The result is a pH near 7. - ans –Neutralization
Mixture in which the components are readily distinguished. - ans -Heterogeneous
Mixture
A change in which the checmical composition of a substance remains the same. -
ans -Physical Change
A change in which the chemical bonds are broken and reformed to create a new
and different substance. - ans -Chemical Change
The simplest of substances and is represented by a specific letter or combinations
of letters. - ans -Element
Combinations of eleements in whole number ratios. - ans -Compounds
Mass cannot be created or destroyed during a chemical reaction. - ans -Law of
Conservation of Mass
The breaking of bonds and the reforming of new bonds to create new chemical
compounds with different chemical forumulas and different chemical properties. -
ans -Chemical Reaction
syntehesis, decomposition, combusion, single replacement, double replacement -
ans -Five main types of chemical reactions.
Two elements combine to form a product. - ans -Syntehsis Reaction
