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PDF Download HESI A2 CHEMISTRY & BIOLOGY EXAM QUESTIONS Qs and Ans Expert- Explanation
This Exam contains:
-Guarantee passing score -100 Questions and Answers -format set of multiple-choice -Expert- Explanation
Question 1: chemical reactions
Answer:
breaking of bonds & reforming of new bonds to create new chemical compounds with different chemical formulas & different chemical properties
Question 2: decomposition
Answer:
breaking of compound into component parts
Question 3: polarity
Answer:
based on difference in electronegativity values for elements involved in the bond; greater the difference the more polar bond will be
Question 4: mole
Answer:
most important concepts in chemistry; amount of a substance that contains 6.02 x 10^23 represents part of that stances
Question 5: weak intermolecular force
Answer:
positive end of a dipole in 1 compound will be attracted to negative end of another dipole in a separate compound
Question 6: Hierarchic System of Organization?
Answer:
Kingdom, Phylum, Class, Order, Family, Genus, Species Question 7: charge: Electron
Answer:
negative charge
Question 8: What are the most significant contributors to cellular function?
Answer:
Proteins
Question 9: 2 types of chemical bonding
Answer:
covalent ionic
Question 10: Most important purposes of Carbs?
Answer:
Storage, Structure, Energy
Question 11: What is cohesion?
Answer:
Ability of a molecule to stay bonded or attracted to another molecule of the same substance.
Question 12: dispersion forces
Answer:
weakest of all intermolecular forces
Question 13: increase in temp
Answer:
causes particles to have a greater kinetic energy; enabling to move faster & greater chance of contact.contact is when chemical reactions occur
Question 14: 5 main types of chemical reactions
Answer:
synthesis decomposition combustion single displacement double displacement
Question 15: 3 states of matter
Answer:
solid liquid gas
Question 16: electrons
Answer:
corresponds to elements atomic # & is equal to # of protons
Question 17: location of electron
Answer:
orbitals (clouds)
Question 18: dipole interactions
Answer:
attraction of 1 dipole for another; created when an electron pair in a covalent bond is shared unequally; result is a bond in which the more highly electronegative element is slightly positive
Question 19: types of mixtures
Answer:
homogenous & heterogenous
Question 20: double covalent bond
Answer:
formed when 2 electron pairs are shared
Question 21: Importance of the way phospholipids form?
Answer:
Create barrier to protect the cell.
Question 22: Structure of phospholipids?
Answer:
Two fatty acids and a phosphate group.
Question 23: What is a lattice?
Answer:
The spreading apart of molecules when they freeze. Causes the phenomenon of floating.
Question 24: 4 ways to increase reaction rate
Answer:
increase in temp increase surface area increase concentration of reactants add a catalyst
Question 25: cation
Answer:
positively charged
Question 26: reversible
Answer:
reactants are forming products at the same rate that products are forming reactants
Question 27: double displacement
Answer:
when anions & cations of 2 different molecules switch places, forming 2 entirely different compounds
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