Chemistry Unit 5 Worksheet 1 Answer Key

Chemistry Unit 5 Worksheet 1 Answer Key

This worksheet covers the basics of chemical reactions, including balancing equations, types of reactions, and stoichiometry.

Section 1: Balancing Chemical Equations

1. Na + O2 → Na2O

Balanced equation: 4Na + O2 → 2Na2O

1. Ca + HCl → CaCl2 + H2

Balanced equation: Ca + 2HCl → CaCl2 + H2

1. Fe + CuSO4 → FeSO4 + Cu

Balanced equation: Fe + CuSO4 → FeSO4 + Cu

Section 2: Identifying Types of Reactions

1. 2H2 + O2 → 2H2O

Type of reaction: Synthesis Reaction

1. NaOH + HCl → NaCl + H2O

Type of reaction: Neutralization Reaction

1. 2Fe + 3O2 → 2Fe2O3

Type of reaction: Combustion Reaction

Section 3: Stoichiometry

1. 2Al + 3CuSO4 → Al2(SO4)3 + 3Cu

If 25.0 g of Al reacts with 50.0 g of CuSO4, how many grams of Cu will be produced?

Answer: 20.0 g

1. CaCO3 → CaO + CO2

If 50.0 g of CaCO3 decomposes, how many grams of CO2 will be produced?

Answer: 22.0 g

Section 4: Short Answer Questions

1. What is the difference between a synthesis reaction and a decomposition reaction?

Answer: A synthesis reaction involves the combination of two or more substances to form a new compound, while a decomposition reaction involves the breakdown of a single compound into two or more simpler substances.

1. What is the purpose of balancing chemical equations?

Answer: Balancing chemical equations ensures that the law of conservation of mass is obeyed, meaning that the number of atoms of each element remains the same on both the reactant and product sides of the equation.

💡 Note: The answers provided are based on general chemistry principles and may vary depending on the specific curriculum or textbook used.

This answer key provides solutions to the problems in Chemistry Unit 5 Worksheet 1. It covers balancing chemical equations, identifying types of reactions, and solving stoichiometry problems.