Energy changes in chemical reactions

Energy changes in chemical reactions

By Hanan Salah

Multiple Choice

What is the left part of a chemical equation called?

2H₂ + O₂ ---> 2H₂O

• Reactants

• Yields

• Products

• Chemical equation

Multiple Choice

What is the right part of a chemical equation called?

2H₂ + O₂ ---> 2H₂O

• Reactants

• Yields

• Products

• Chemical Equation

Multiple Choice

How many Mn atoms are found in the following compound?

2MnO₄

• 1

• 2

• 4

• 8

Multiple Choice

What is the little number after an element in a chemical equation called?

Example: H₂

• Coefficient

• Atom

• Subscript

• Equation

Multiple Choice

What is the number before a chemical formula called?

Example: 2H₂ + O₂ ---> 2H₂O

• Coefficient

• Atom

• Subscript

• Equation

Multiple Choice

How many elements are in C₆H₁₂O₆?

• 1

• 2

• 3

• 4

Multiple Choice

Complete the sentence.

During a chemical reaction, atoms ________.

• can appear

• can disappear

• get rearranged

• stop moving and vibrating

Multiple Choice

What is the Law of Conservation of Mass?

• It states that matter cannot be created or destroyed.

• It states that energy cannot be created or destroyed.

• It states that matter can be created or destroyed.

• It states that sound can be created or destroyed.

Multiple Choice

Energy stored in chemical bonds.

• mechanical energy

• chemical potential energy

• elastic potential energy

• kinetic energy

Multiple Choice

What term is given to a reaction which transfers heat energy to the surroundings?

• Endothermic

• Reversible

• Exothermic

• Exotermic

Multiple Choice

In an endothermic reaction, energy is _________.

• absorbed

• released

Multiple Choice

What term is given to a reaction which transfers heat energy to the surroundings?

• Endothermic

• Reversible

• Exothermic

• Exotermic

Multiple Choice

if more heat energy is released in making bonds in the products than is taken in when breaking bonds in the reactants

• Exothermic

• Endothermic

• Exotermic

• Endotermic

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