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WorksheetsExploring Chemical Reactions and Acids
Total questions: 10
Worksheet time: 5mins
What is a chemical reaction?
A chemical reaction is a process that transforms reactants into products through the breaking and forming of chemical bonds.
A chemical reaction is a process that only involves physical changes.
A chemical reaction is a method to separate elements from a compound.
A chemical reaction is the mixing of substances without any change.
Define the law of conservation of mass.
Mass is only conserved in open systems.
Mass is conserved in a closed system; it cannot be created or destroyed.
Mass changes form but is not conserved.
Mass can be created but not destroyed.
What are reactants and products in a chemical reaction?
Reactants are the starting materials; products are the substances formed.
Reactants are the substances that disappear; products are the substances that remain unchanged.
Reactants are the final products; products are the initial materials.
Reactants are always gases; products are always solids.
Explain the difference between exothermic and endothermic reactions.
Exothermic reactions release energy; endothermic reactions absorb energy.
Both exothermic and endothermic reactions release energy.
Exothermic reactions absorb energy; endothermic reactions release energy.
Exothermic reactions occur only in gases; endothermic reactions occur only in liquids.
What is pH and how is it measured?
pH is a measure of temperature, measured with thermometers.
pH indicates the concentration of oxygen in water, measured with oxygen sensors.
pH is a measure of pressure, measured with barometers.
pH is a measure of acidity/alkalinity, measured with pH meters or indicator strips.
List three properties of acids.
Bitter taste
Do not conduct electricity
React with metals to form hydrogen gas
1. Sour taste 2. Conduct electricity in solution 3. React with bases to form salts and water
What is the neutralization reaction?
A reaction between an acid and a base that produces water and a salt.
A reaction between a base and a metal that produces hydrogen gas.
A reaction that occurs only in the presence of a catalyst.
A reaction between two acids that produces carbon dioxide.
How do bases differ from acids in terms of taste and feel?
Acids taste sweet and feel smooth; bases taste salty and feel rough.
Acids taste spicy and feel warm; bases taste tangy and feel cool.
Acids taste sour and feel tingling; bases taste bitter and feel slippery.
Acids taste bland and feel dry; bases taste sour and feel sticky.
What is the role of indicators in determining acidity or basicity?
Indicators provide a numerical value for pH levels.
Indicators help determine acidity or basicity by changing color in response to pH levels.
Indicators are used to neutralize acids and bases.
Indicators measure temperature to determine acidity.
Give an example of a common acid and its use in daily life.
Hydrochloric acid is used in swimming pool maintenance.
Sulfuric acid is commonly used in car batteries.
Acetic acid (vinegar) is used in cooking and food preservation.
Citric acid (lemon juice) is used for cleaning windows.
