Question

I NEED HELP ASAP PLEASE WILL AWARD AND FAN.
which of these is an indication that a chemical reaction has occured?
a. formation of gas
b.freezing of a substance
c.boiling of a substance
d.melting of a substance

Answer 1

If the temperature changes in a chemical reaction, what has occurred?
a.energey was destroyed
b.energy was transferred
c.energy was created
d.there was no energy transfer

Answer 2

Which of these Accurately describes the reactants of a reaction?
a.substances that do not participate of a reaction
b. new substances that are present at the end of a reaction
c.substances that are used up in a reaction
d.new substances formed in the reaction

Answer 3

5.what occurs in a chemical reactiong
A.no chemical bonds are broken
b. reactants break bonds and reform the same bonds
c.reactants break bonds but do not form new substances
d. reactants break bonds and form new bonds to make new substances
4.in which of these reactions is energy released?
a.exothermic
b.no reactions
c.all reactions
d.endormic reaction

Answer 4

the first one is A
the second one is B
the third one is c
the fourth one(5) is D
The fifth one is A