Logic of a solution: *Hydrogen bonds cause water to expand when it freezes. Hydrogen bonds Hydrogen bonds are primarily electrostatic in origin. Something that is primarily electrostatic in origin causes water to expand when it freezes.*
*(B)*
The original question: *Something that is primarily electrostatic in origin causes water to expand when it what?
Options:
- (A) heat
- (B) freezes
- (C) a hazard
- (D) boiling
- (E) moves
- (F) reacts
- (G) expelled
- (H) it's state*


Logic of a solution: *Producers use energy and inorganic molecules to make food. Decomposition is the breakdown of organic molecules into inorganic molecules. Decomposition provides resources for producers to create food.*
*(C)*
The original question: *What process helps provide resources for producers to create food?
Options:
- (A) animals
- (B) Exfoliation
- (C) decomposition
- (D) mastication
- (E) recycling
- (F) reproduction
- (G) ejaculation
- (H) Converting waste.*


Logic of a solution: *All chemical reactions require activation energy to get started. Chemical equations describe chemical reactions. Chemical equations describe something that requires activation energy to get started.*
*(G)*
The original question:
*What describes something that requires activation energy to get started?
Options:
- (A) igniting fuel and oxidiser
- (B) heating liquids
- (C) Fully cooking the oysters
- (D) Riding a bike
- (E) an engine
- (F) burning coal
- (G) chemical equations
- (H) Firecrackers*