WorksheetsChemical Reactions Quiz
Total questions: 10
Worksheet time: 7mins
Which of the following most likely represents a chemical change?
Water boiling
Sugars Digested by saliva
Mud Drying to dirt
Ice cream melting
How many atoms of Iron are on the products side of the following equation? Fe2O3 + 3H2 → 2Fe + 3H2O
2
3
4
1
How many oxygen atoms are on the reactants side of the following equation: Fe2O3 + 3H2 → 2Fe + 3H2O
4
6
3
1
How many atoms of hydrogen are on the reactants side of the following equation: Fe2O3 + 3H2 → 2Fe + 3H2O
6
3
2
4
Two molecules of sodium azide (NaN3) break down into sodium (Na) and nitrogen gas (N2) during a reaction. How many sodium (Na) atoms are produced in the reaction?
1 Na atom
2 Na atoms
3 Na atoms
What symbol in a chemical equation separates the reactants from the products?
=
-->
≥
+
What is the number +4+ in SiCl4?
a subscript
a coefficient
a product
a reactant
Cecil writes the equation for the reaction of hydrogen and oxygen below.
H2 + O2 → H2O
Why does the teacher ask him to balance the equation by including the correct coefficients?
to show that most molecules exist in pairs.
to show that most compounds exist in pairs.
to show that atoms are conserved in chemical reactions.
to show that atoms are created in chemical reactions.
Leslie incorrectly balances an equation as 2C4H10 + 12O2 → 8CO2 + 10H2O.
Which coefficient should she change?
2
8
10
12
In a process called photosynthesis, plants use carbon dioxide and water, along with energy from sunlight, to produce sugar and oxygen. Photosynthesis is represented by the equation
What must a plant need to produce 4 molecules of sugar?
6 molecules of CO2
6 molecules of H2O
18 molecules of CO2
24 molecules of H2O
