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WorksheetsChemical Reactions and Counting Atoms
Total questions: 15
Worksheet time: 15mins
Which of the following lists all of the elements that are present in a molecule of potassium carbonate, K2CO3?
Phosphate and calcium
Potassium, carbon, and oxygen
Argon and Oxygen
Phosphorus, oxygen, and calcium
What would be the chemical formula for the molecule above
CH8
C8H
CH4
C4H
Which of the following would be evidence that a chemical change took place? Click all that apply.
A solid melts at 200oC
A precipitate is formed
A rock breaks in half
Sugar Dissolves in Kool-Aid
Light and heat are produced when a log burns
What does the Law of Conservation of Mass state?
matter can always been created
matter is always destroyed
matter cannot be created or destroyed
Matter can be destroyed, but never created
When two liquids are mixed together and a solid is formed, what do we call it?
Metal
A rock
Precipitation
Precipitate
Determine the number of atoms for each element in the compound: OC(NH₂)₂
O =
C =
N =
H =
(a)
What does the red represent on the formula?
(a)
Determine the number of " Fe" atoms for each element in the compound: 5 Fe₂(SO₄)₃
(a)
The blue number represents the:
(a)
In the equation shown, what are the product(s)?
(a)
Determine the number "O" of atoms for each element in the compound: H₃BO₃
(a)
What are the reactants of the formula:
CH4 +CO2
CH4+ 2O2
CO2+202
CO2+ 2H20
Which of the following is a balanced chemical equation?
@@ ext{H}_2 + ext{O}_2 ightarrow ext{H}_2 ext{O}@@
@@ ext{2H}_2 + ext{O}_2 ightarrow ext{2H}_2 ext{O}@@
@@ ext{H}_2 + ext{O}_2 ightarrow ext{2H}_2 ext{O}@@
@@ ext{2H}_2 + ext{2O}_2 ightarrow ext{2H}_2 ext{O}@@
In the reaction @@ ext{2H}_2 + ext{O}_2 ightarrow ext{2H}_2 ext{O}@@, how many oxygen atoms are there in the reactants?
1
2
3
4
What is the total number of atoms in a molecule of glucose, C6H12O6 ?
12
24
18
6
