Chemical Rxns practice problems

Question 1

What would slow down a reaction rate (2)?

Answer 1

• decreasing reactants
• decreasing pressure (bc decreasing temp and so decreasing OVERALL velocity of particles = decreasing number of collision of particles= dec rate of rxn)

Question 2

An enzyme speeds up the rate of reaction of what?

Answer 2

the forward AND the reverse rxn

Question 3

Which element is most likely to make 4 covalent bonds

Answer 3

CARBON

Question 4

What is the number as well as type of bond an atom of nitrogen is most likely going to make?

Answer 4

• 3, covalent
• 3 bc nitrogen becomes a -3 ion to have full 8 valence e-‘s, so to get to be a -3 ion , it has to gain 3 electrons
• covalent bc it is a non-metal

Question 5

Why does a change in pressure affect the rate of a rxn?

Answer 5

A: changes the velocity of the mlcs

inc in pressure causes an inc in temp = inc OVERALL velocity of the particles –> inc collison b/w particles = inc rate of reaction

Question 6

What atom forms the same number and type of bonds as Na?

Answer 6

F bc it forms a -1 anion and Na forms a +1 cation in order to get full 8 valence shell (so both are forming 1 bond bc F is gaining an electron and Na is losing an electron and both bonds are ionic)

Question 7

What type of bonds join carbon and oxygen in CO2?

Answer 7

covalent

Question 8

is CO2 overall polar or nonpolar?

Answer 8

nonpolar bc the dipoles going in opp direction linearly cancel each other out

Question 9

ATI manual page 239 question 4

Question 10

ATI manual page 239 question 5