HESI A2 CHEMISTRY: CHEMICAL REACTIONS CHEMICAL

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HESI A2 CHEMISTRY: CHEMICAL REACTIONS & CHEMICAL

BONDING EXAM QUESTIONS

Actual Qs and Ans Expert-Verified Explanation

This Exam contains:

-Guarantee passing score -21 Questions and Answers -format set of multiple-choice -Expert-Verified Explanation

Question 1: Polarity

Answer:

Based on the difference in electronegativity values for the elements involved in the bonds

Question 2: Decomposition

Answer:

Opposite of synthesis b/c it is the breaking of a compound into its component parts NaCl --> Na+ + Cl-

Question 3: Chemical Bonding

Answer:

Joining of one atom, element, or chemical to another

Question 4: Single covalent bond

Answer:

Sharing of one pair of electrons

Question 5: Strongest bond?

Answer:

Colavent bond

Question 6: Polar bond

Answer:

Shared electron density of the bond is concentrated around one atom more than the other

Question 7: Non-polar

Answer:

If electrons in the covalent bond are shared equally

Question 8: Triple covalent bond

Answer:

Formed when 3 electron pairs are shared

Question 9: Double Replacement

Answer:

Involve 2 iconic compounds; Positive ion from one compound combines with the negative ion of another compound AgNO3 + KCl --> AgCl + KNO3

Question 10: Single Replacement

Answer:

More active metal reacting with an iconic compound containing a less active metal to produce a new compound.Cu (s) + 2AgNO3 (aq) --> Cu(NO3)2 (aq) + 2 Ag (s)

Question 11: Intermolecular forces

Answer:

Types of attraction b/w particles; weaker forces of attraction b/w whole molecules

Question 12: Combustion

Answer:

Self-sustaining, exothermic chemical reaction where oxygen and a fuel compound such as hydrocarbon react.2C2H6 (g) + 7O2 (g) --> 4CO2 (g) + 6H2O (g)

Question 13: 5 Chemical Reactions

Answer:

Synthesis, decomposition, combustion, single replacement, and double replacement

Question 14: Double covalent bond

Answer:

Formed when 2 electron pairs are shared

Question 15: Synthesis

Answer:

• elements combine to form a product

2K+ + 2Cl- --> 2KCl

Question 16: Hydrogen bond

Answer:

Attraction for a hydrogen atom by a highly electronegative elements; strongest bond of the intermolecular forces

Question 17: Chemical Reactions

Answer:

Making or changing chemical bonds between elements or compounds to create new chemical compounds with different chemical formulas and different chemical properties

Question 18: Dispersion forces

Answer:

Weakest; Electrons within an element or a compound will concentrate themselves on one side of an atom.

Question 19: Covalent bond

Answer:

Formed when 2 atoms share electrons, generally in pairs. with one pair from each atom.

Question 20: Iconic bond

Answer:

Electrostatic attraction b/w 2 oppositely charged ions, or a cation and an anion. Generally formed b/w a metal and a non-metal.

Question 21: Dipole-dipole interactions

Answer:

Attraction of one dipole on one molecule for the dipole of another molecule.