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Types of Chemical Reactions

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Questions and Answers

Which statement best describes what happens during a chemical reaction?

Reactants remain exactly the same as the products.

Heat energy is always absorbed and lost.

Matter is created or destroyed.

Atoms are rearranged to form products different from the original reactants. (correct)

What is the role of reactants in a chemical reaction?

They are found to the right of the arrow in a chemical reaction formula.

They are not involved in the chemical reaction.

They go into the chemical reaction and are typically to the right of the arrow.

They go into the chemical reaction and are typically found to the left of the arrow. (correct)

What is an exothermic reaction?

A reaction where heat energy is released. (correct)

A reaction where heat energy is absorbed.

A reaction where matter is created.

A reaction where atoms are not rearranged.

Which of the following is NOT an example of a chemical change?

Mixing sugar with water Signup and view all the answers

What is the purpose of indicators in chemistry?

To determine if a chemical change or reaction has occurred Signup and view all the answers

During a chemical reaction, what happens to the overall energy?

Energy remains constant. Signup and view all the answers

What are products in a chemical reaction?

Substances found to the right of the arrow in a chemical formula. Signup and view all the answers

In a double-replacement reaction, what do two ionic compounds swap?

Ions Signup and view all the answers

Which type of reaction involves the combining of two or more elements and/or substances to create one new substance?

Combination reaction Signup and view all the answers

What is the key characteristic of a decomposition reaction?

Chemical breakdown into two or more components Signup and view all the answers

Which type of reaction involves a hydrocarbon reacting with oxygen to produce carbon dioxide and water?

Combustion reaction Signup and view all the answers

What is the product when a combination reaction occurs between magnesium metal and oxygen gas?

Magnesium oxide powder Signup and view all the answers

In a single-replacement reaction, a positively charged cation can only be replaced by what type of atom?

Atom that can act as a cation Signup and view all the answers

What characterizes a combustion reaction?

Formation of a gas Signup and view all the answers

Which type of reaction involves one thing breaking down into two or more components?

Decomposition reaction Signup and view all the answers