18 Questions
What type of chemical reaction is occurring when a magnesium ribbon burns in oxygen and changes into magnesium oxide?
Combustion reaction
In the activity involving lead nitrate and potassium iodide, what type of reaction takes place?
Double displacement reaction
What type of reaction occurs when zinc granules react with dilute hydrochloric acid or sulphuric acid?
Single displacement reaction
What are the possible observations that indicate a chemical reaction has taken place?
Change in state, change in colour, evolution of a gas, change in temperature
What variety of chemical reactions can be observed in the environment?
A large variety
What is the symbolic representation of chemical reactions called?
Chemical equations
What is a displacement reaction?
A displacement reaction occurs when an element displaces another element from its compound.
Explain a double displacement reaction.
In a double displacement reaction, two different atoms or groups of atoms (ions) are exchanged between two compounds.
What are precipitation reactions?
Precipitation reactions produce insoluble salts when two solutions are mixed.
Describe the exchange of ions in a double displacement reaction.
In a double displacement reaction, ions from two different compounds exchange places to form new compounds.
What is the reactivity series and how is it related to displacement reactions?
The reactivity series is a list of metals arranged in order of their reactivity. Displacement reactions occur when a more reactive metal displaces a less reactive metal from its compound.
Explain the concept of oxidation and reduction in displacement reactions.
Oxidation is the gain of oxygen or loss of hydrogen, while reduction is the loss of oxygen or gain of hydrogen in a displacement reaction.
Define exothermic and endothermic reactions with examples.
Exothermic reactions release heat energy to the surroundings, like combustion. Endothermic reactions absorb heat energy from the surroundings, like photosynthesis.
Why is respiration considered an exothermic reaction? Explain.
Respiration is exothermic because it releases energy in the form of heat and it involves the breakdown of glucose to produce ATP.
Why are decomposition reactions called the opposite of combination reactions? Provide equations for these reactions.
Decomposition reactions involve the breakdown of a compound into its simpler components, opposite of combination reactions where elements or compounds combine to form a new compound.
Provide one equation each for decomposition reactions where energy is supplied in the form of heat, light, or electricity.
Decomposition with heat: $2HgO ightarrow 2Hg + O_2$. Decomposition with light: $2AgCl ightarrow 2Ag + Cl_2$. Decomposition with electricity: $2H_2O ightarrow 2H_2 + O_2$.
What is the difference between displacement and double displacement reactions? Provide equations for these reactions.
Displacement reactions involve an element displacing another in a compound, while double displacement reactions involve the exchange of ions between two compounds.
Explain the reaction involved in the refining of silver where copper displaces silver from silver nitrate solution.
In the reaction, copper displaces silver from silver nitrate solution, forming copper nitrate and silver.
Test your knowledge on chemical reactions and equations. Learn about balancing chemical equations, representing reactants and products, and understanding the symbols used in chemical equations.
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