Section 2 Describing Chemical Reactions

Question 1

What are chemical equations

Answer 1

Chemical equations use chemical formulas and other symbols of words to summarize a reaction

Question 2

Using formulas

Answer 2

• the formula tells to the ratio of the compound

Question 3

Structure of an equation

Answer 3

• chemical equations tell you the substances start with in a reaction and the substance you get at the end
• when it’s complete it creates a product

Question 4

Conservation of matter

Answer 4

• chemical reactions, matter is neither created nor destroyed

Question 5

Conservation of atoms

Answer 5

• in chemical reactions, the number of atoms stays the same no matter how they are arranged. So their total mass stays the same

Question 6

Open and closed systems

Answer 6

• Open system= matter can enter form or escape to the surroundings
• closed systems = matter is not allowed to enter or leave

Question 7

Balancing chemical equations

Answer 7

To describe a reaction accurately, a chemical equation must show the same number of each type of atom on both sides of the equation

Question 8

Classifying chemical reactions

Answer 8

Three general types of chemical reactions are synthesis, decomposition, and replacement

Question 9

Synthesis

Answer 9

To put together

Hydrogen and oxygen mixed make water that’s a synthesis reaction

Question 10

Decomposition

Answer 10

Hydrogen peroxide decomposes into water and oxygen gas

Question 11

Replacement

Answer 11

When one element replaces another