Question

8. In a decomposition reaction:
a. energy in the form of heat or light is often produced
b. one of the reactants is often water
c. the reactants are usually a metal and a non-metal
d. the reactants are generally two ionic compounds in aqueous solution

Answer 1

Answer:

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Here is your answer,

Option d. The reactants are generally two ionic compounds in aqueous solution.

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Answer 2

a. Because chemical energy is stored, it is a form of potential energy. When a chemical reaction takes place, the stored chemical energy is released. Heat is often produced as a by-product of a chemical reaction – this is called an exothermic reaction.

b.When an electric current is passed through liquid water (H2O), it changes the water into two gases—hydrogen and oxygen. The molecules of water break apart into individual atoms. These atoms then recombine into hydrogen molecules (H2) and oxygen molecules (O2).

c.When metals react with non-metals, electrons are transferred from the metal atoms to the non-metal atoms, forming ions. The resulting compound is called an ionic compound. Reactions between metals and non-metals include: sodium + chlorine → sodium chloride.

d.What are the usual reactants in a double replacement reaction?

In a typical double replacement reaction, you have two reactants and two products. All are compounds. An example of a typical double replacement reaction is: Solutions of potassium chloride and sodium chlorate are mixed together.