Hesi A2 CHEMISTRY QUESTIONS WITH
CORRECT ANSWERS
Mixture with uniform density throughout and no distinguishable coponents. - Correct answer-
Homogeneous Mixture
Mixture in which the components are readily distinguished. - Correct answer- Heterogeneous
Mixture
A change in which the checmical composition of a substance remains the same. - Correct
answer- Physical Change
A change in which the chemical bonds are broken and reformed to create a new and different
substance. - Correct answer- Chemical Change
The simplest of substances and is represented by a specific letter or combinations of letters. -
Correct answer- Element
Combinations of eleements in whole number ratios. - Correct answer- Compounds
Mass cannot be created or destroyed during a chemical reaction. - Correct answer- 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. - Correct answer- Chemical
Reaction
syntehesis, decomposition, combusion, single replacement, double replacement - Correct
answer- Five main types of chemical reactions.
Two elements combine to form a product. - Correct answer- Syntehsis Reaction
The breaking of a compound into component parts. - Correct answer- Decomposition Reaction
The reaction of a compound or element with oxygen. In the combusiton of a hydrocarbon
carbon dioxide and water are produced. - Correct answer- Combustion Reaction
Reaction involoving ionic compounds. The reactivity of the ionic compounds determines
whether the reaction will take place or not. Can be single replacement or double replacement
reaction. - Correct answer- Replacement Reactions
Reaction between a more active metal reacting with an ionic compound containing a less active
metal to produce a new compound ex. copper wire reacting with aqueous silver nitrate. -
Correct answer- Single Replacement Reaction
Reaction involving two ionic compounds where the positive ion from one compound combines
with the negative ion of the other compound. The result it two new ionic compounds that have
switches partners. - Correct answer- Double Replacement Reaction
The number of protons in a given element. - Correct answer- Atomic Number
, An average of the masses of each of the iostopes of an element as they occur in mature.
(Represents the number of protons and the number of neutrons in an element because
electrons essentially have no mass). - Correct answer- Atomic Weight/ Atomic mass number
What group has a +1 charge - Correct answer- IA
What group has a +2 charge - Correct answer- IIA
What group has a +3 charge - Correct answer- IIIA
Density of an object realtive to water - Correct answer- Specific Gravity
Energy of motion - Correct answer- Kinetic Energy
Stored energy - Correct answer- Potential Energy
Form of energy, measured in calories - Correct answer- Heat
The amount of heat necessary to raise the temperature of 1g of water by 1 degree celsius. -
Correct answer- Calorie
Combination of two or more pure substances. - Correct answer- Mixture
Atoms with the same number of protons but different numbers of neutrons. - Correct answer-
Isotope
Elements in group 8A of the periodic table. Have no charge and are gases under normal
conditions. (Helium, Neon, Argon, Krypton, Xenon, Radon) - Correct answer- Noble Gases
CORRECT ANSWERS
Mixture with uniform density throughout and no distinguishable coponents. - Correct answer-
Homogeneous Mixture
Mixture in which the components are readily distinguished. - Correct answer- Heterogeneous
Mixture
A change in which the checmical composition of a substance remains the same. - Correct
answer- Physical Change
A change in which the chemical bonds are broken and reformed to create a new and different
substance. - Correct answer- Chemical Change
The simplest of substances and is represented by a specific letter or combinations of letters. -
Correct answer- Element
Combinations of eleements in whole number ratios. - Correct answer- Compounds
Mass cannot be created or destroyed during a chemical reaction. - Correct answer- 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. - Correct answer- Chemical
Reaction
syntehesis, decomposition, combusion, single replacement, double replacement - Correct
answer- Five main types of chemical reactions.
Two elements combine to form a product. - Correct answer- Syntehsis Reaction
The breaking of a compound into component parts. - Correct answer- Decomposition Reaction
The reaction of a compound or element with oxygen. In the combusiton of a hydrocarbon
carbon dioxide and water are produced. - Correct answer- Combustion Reaction
Reaction involoving ionic compounds. The reactivity of the ionic compounds determines
whether the reaction will take place or not. Can be single replacement or double replacement
reaction. - Correct answer- Replacement Reactions
Reaction between a more active metal reacting with an ionic compound containing a less active
metal to produce a new compound ex. copper wire reacting with aqueous silver nitrate. -
Correct answer- Single Replacement Reaction
Reaction involving two ionic compounds where the positive ion from one compound combines
with the negative ion of the other compound. The result it two new ionic compounds that have
switches partners. - Correct answer- Double Replacement Reaction
The number of protons in a given element. - Correct answer- Atomic Number
, An average of the masses of each of the iostopes of an element as they occur in mature.
(Represents the number of protons and the number of neutrons in an element because
electrons essentially have no mass). - Correct answer- Atomic Weight/ Atomic mass number
What group has a +1 charge - Correct answer- IA
What group has a +2 charge - Correct answer- IIA
What group has a +3 charge - Correct answer- IIIA
Density of an object realtive to water - Correct answer- Specific Gravity
Energy of motion - Correct answer- Kinetic Energy
Stored energy - Correct answer- Potential Energy
Form of energy, measured in calories - Correct answer- Heat
The amount of heat necessary to raise the temperature of 1g of water by 1 degree celsius. -
Correct answer- Calorie
Combination of two or more pure substances. - Correct answer- Mixture
Atoms with the same number of protons but different numbers of neutrons. - Correct answer-
Isotope
Elements in group 8A of the periodic table. Have no charge and are gases under normal
conditions. (Helium, Neon, Argon, Krypton, Xenon, Radon) - Correct answer- Noble Gases
