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WorksheetsScience Ten - Review
Total questions: 10
Worksheet time: 6mins
Which of the following refers to the substance that is altered or changed during the course of a chemical reaction?
solvent
reactant
solute
product
Which of the following refers to a substance that emerges from a chemical reaction?
solvent
reactant
product
solute
In a chemical reaction that involves more than one reactants, which symbol separates these reactants to one another in a chemical equation?
→
=
–
+
Refer to the chemical reaction below.
propane + oxygen → water + carbon dioxide
What are the reactants?
carbon dioxide
propane
water
oxygen
Refer to the chemical reaction below.
HCl+KOH→KCl+H2O
What are the products?
H2O
HCl
KOH
KCl
Refer to the chemical reaction below.
2Mg(s)+O2(g)→2MgO(s)
What does the subscript 2 in O2 mean?
two oxygen molecules as reactant
two oxygen atoms in a molecule
the oxygen is in gaseous state
two oxygen atoms as product
Why are chemical symbols more practical than words in writing a chemical equation?
They allow us to predict the products from the reactants.
They allow us to predict the color and texture of the products.
They allow us to determine the ratio of atoms and molecules.
They allow us to determine the volume of the reactants.
Refer to the chemical reaction below.
4Fe+3O2→2Fe2O3
Fe2O3 is the chemical formula of rust. How many iron and oxygen atoms are used up to produce two rust molecules?
four iron and six oxygen atoms
four iron and three oxygen atoms
two iron and six oxygen atoms
two iron and three oxygen atoms
What is the chemical name of NaCl
Sodium Chlorine
Sodium Chloride
Monosodium Monochloride
What is the chemical formula of Carbon Trioxide
CO2
CO4
CO3
CO5
