WorksheetsChemical Formula STAAR Review
Total questions: 10
Worksheet time: 5mins
What are the products in the chemical reaction shown?
CH₄ and O₂
CO₂ and H₂O
CH₄ and CO₂
O₂ and H₂O
How many different elements are present in the reaction?
2
3
4
5
How many total molecules are present in the products?
1
2
3
4
How many total atoms are present in the reactants?
5
6
9
10
How many oxygen atoms are in 2H₂O?
1
2
3
4
What are the reactants in the chemical reaction?
CH₄ and CO₂
CO₂ and H₂O
CH₄ and O₂
O₂ and H₂O
How many hydrogen atoms are in CH₄?
1
2
3
4
How do we know this is a chemical reaction?
New substances are formed.
The color changes.
The temperature increases.
The substances dissolve.
Is this chemical reaction balanced? Justify your answer.
Yes, because the number of atoms is the same on both sides.
No, because there are more reactants than products.
Yes, because the products are different from the reactants.
No, because the reaction releases energy.
How many oxygen molecules are used in the reaction?
1
2
3
4
