HESI A2 CHEMISTRY EXAM QUESTIONS WITH FULLY SOLVED AND UPDATED ANSWERS

HESI A2 CHEMISTRY EXAM QUESTIONS WITH FULLY
SOLVED AND UPDATED ANSWERS.

1) Homogeneous Mixture -- Answer ✔✔ Mixture with uniform density throughout
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and no distinguishable components.
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2) Heterogeneous Mixture -- Answer ✔✔ Mixture in which the components are _ _ _ _ _ _ _ _ _ _ _




readily distinguished.
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3) Physical Change -- Answer ✔✔ A change in which the chemical composition of a
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substance remains the same. _ _ _




4) Chemical Change -- Answer ✔✔ A change in which the chemical bonds are
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broken and reformed to create a new and different substance.
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5) Element -- Answer ✔✔ The simplest of substances and is represented by a
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specific letter or combinations of letters.
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6) Compounds -- Answer ✔✔ Combinations of elements in whole number ratios.
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7) Law of Conservation of Mass -- Answer ✔✔ Mass cannot be created or destroyed
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_during a chemical reaction.
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8) Chemical Reaction -- Answer ✔✔ The breaking of bonds and the reforming of
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new bonds to create new chemical compounds with different chemical formulas
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and different chemical properties.
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9) Five main types of chemical reactions. -- Answer ✔✔ synthesis, decomposition,
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combustion, single replacement, double replacement _ _ _ _




10) Synthesis Reaction -- Answer ✔✔ Two elements combine to form a product.
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, 11) Decomposition Reaction -- Answer ✔✔ The breaking of a compound into _ _ _ _ _ _ _ _ _ _ _




component parts. _




12) Combustion Reaction -- Answer ✔✔ The reaction of a compound or element
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with oxygen. In the combustion of a hydrocarbon carbon dioxide and water are
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produced.

13) Replacement Reactions -- Answer ✔✔ Reaction involving ionic compounds. The
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reactivity of the ionic compounds determines whether the reaction will take place
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or not. Can be single replacement or double replacement reaction.
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14) Single Replacement Reaction -- Answer ✔✔ Reaction between a more active
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metal reacting with an ionic compound containing a less active metal to produce a
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new compound ex. copper wire reacting with aqueous silver nitrate.
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15) Double Replacement Reaction -- Answer ✔✔ Reaction involving two ionic
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compounds where the positive ion from one compound combines with the
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negative ion of the other compound. The result it two new ionic compounds that
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have switches partners.
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16) Atomic Number -- Answer ✔✔ The number of protons in a given element.
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17) Atomic Weight/ Atomic mass number -- Answer ✔✔ An average of the masses of
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_ each of the isotopes of an element as they occur in mature. (Represents the
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number of protons and the number of neutrons in an element because electrons
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essentially have no mass). _ _ _




18) IA -- Answer ✔✔ What group has a +1 charge
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19) IIA -- Answer ✔✔ What group has a +2 charge
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20) IIIA -- Answer ✔✔ What group has a +3 charge
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21) Specific Gravity -- Answer ✔✔ Density of an object relative to water
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