How does a catalyst influence a chemical reaction. A. It speeds up or slows down a chemical reaction by direct participation.
B. it reacts with products to increase the concentration of reactants.
C. It provides an alternative energy pathway for the reaction to proceed.
It provides an alternative energy pathway for the reaction to proceed.
D. It increases the total amount of product formed.

the correct answer is:

a. formation of precipitation

16

explanation:

the marks go by 4s

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.

more infor would

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