Question

#1: Methane burns in oxygen to yield carbon dioxide and water. The chemical formula for this reaction is CH4 + 2O2--> CO2 + 2H2O. What is the product, or what are the products, of this reaction?

A. oxygen and methane

B. water and methane

C. carbon dioxide and water

D. carbon dioxide and methane

**my answer: C

is it right?

Answer 1

#2: Carbon and oxygen combine to form carbon dioxide. What are the products, or what is the product, in this chemical reaction?

A. carbon only

B. oxygen only

C. carbon and oxygen

D. carbon dioxide

***my answer; C

is that right?

Answer 2

1 is right, but the second is carbon dioxide, D.

Answer 3

#3: What does the law of conservation of mass say?

A. The mass of the products in a chemical reaction is equal to the mass of the reactants.

B. The mass of the reactants is greater than the mass of the products in a chemical reaction.

C. The mass of the reactants is less than the mass of the products in a chemical reaction.

D. The mass of the products in a chemical reaction is unrelated to the mass of the reactants.

**my answer; A
is that right?

Answer 4

and okay :)

Answer 5

#4: Which of the following equations is balanced?

attached answer choices A,B,C,D top to bottom :)

**my answer; D

is that right?

Answer 6

#5: What type of chemical reaction is CH4 + 2O2 ---> CO2 + 2H2O?

A. decomposition

B. combustion

C. synthesis

D. single-displacement

**my answer: B. combustion

is that right?? :D

Answer 7

yep! 3,4,5 are right!

Answer 8

awesome! :) thanks!! :D

Answer 9

:)

Answer 10

l,