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WorksheetsChemistry Concepts for Grade 10
Total questions: 12
Worksheet time: 6mins
What is the pH range of acids?
7 to 14
8 to 14
0 to 7
-1 to 0
Define a base according to the Arrhenius theory.
A base is a substance that decreases the concentration of hydrogen ions (H+) in solution.
A base is a substance that reacts with acids to form salts and water without affecting pH.
A base is a substance that increases the concentration of carbon dioxide (CO2) in solution.
A base is a substance that increases the concentration of hydroxide ions (OH-) in solution.
What is the chemical formula for hydrochloric acid?
CO2
HCl
NaCl
H2O
Describe the process of neutralization.
Neutralization is the reaction between an acid and a base to produce water and a salt.
Neutralization occurs when a base reacts with another base to form a gas.
Neutralization is the reaction between a metal and a non-metal to produce electricity.
Neutralization is the process of mixing two acids together.
What is a chemical reaction? Give an example.
Photosynthesis: 6 CO2 + 6 H2O -> C6H12O6 + 6 O2
Dissolving salt in water: NaCl -> Na+ + Cl-
Rusting of iron: 4 Fe + 3 O2 -> 2 Fe2O3
An example of a chemical reaction is the combustion of methane: CH4 + 2 O2 -> CO2 + 2 H2O.
List the signs that a chemical reaction has occurred.
Formation of a solid layer
Change in pH level
Formation of a precipitate, Color change, Gas production, Temperature change, Emission of light
Absence of odor
What are organic compounds?
Organic compounds do not contain carbon.
Organic compounds are carbon-containing substances that are essential for life.
Inorganic compounds are always harmful to living organisms.
Organic compounds are exclusively found in plants.
Name the simplest organic compound.
Ethane
Butane
Methane
Propane
What is the functional group of alcohols?
-CHO (aldehyde group)
-OH (hydroxyl group)
-COOH (carboxyl group)
-NH2 (amino group)
Explain the difference between saturated and unsaturated hydrocarbons.
Saturated hydrocarbons are always liquid; unsaturated hydrocarbons are always solid.
Saturated hydrocarbons contain only double bonds; unsaturated hydrocarbons have single bonds.
Saturated hydrocarbons have fewer hydrogen atoms; unsaturated hydrocarbons have maximum hydrogen atoms.
Saturated hydrocarbons have only single bonds and maximum hydrogen atoms; unsaturated hydrocarbons have double or triple bonds and fewer hydrogen atoms.
What is the role of catalysts in chemical reactions?
Catalysts decrease the rate of chemical reactions by increasing activation energy.
Catalysts increase the rate of chemical reactions by lowering activation energy.
Catalysts only work in specific temperature ranges and have no effect outside those ranges.
Catalysts are consumed in the reaction and do not affect the overall energy change.
Write the general formula for alkanes.
CnH2n-2
C2nH2n+1
CnH2n+2
CnH2n
