Unit 2? Flashcards
What’s a homologous series? Why does this mean?
A homologous series is a family of compounds that can be represented by a general formula.
What is the name of the group to describe alcohols?
-OH hydroxyl group.
General formula for alcohols?
CnH2n+1OH.
What is the group used to describe carboxylic acids?
COOH.
= C = O
|
OH
What’s the uses of alcohols?
- food preservatives
- clean products
What’s good about ethanol?
Renewable source of energy, made naturally by photosynthesis.
What’s an exothermic reaction?
An exothermic reaction is when energy is released when new covalent bonds are made.
What’s an endothermic reaction?
An endothermic reaction is when energy is taken in during a reaction.
What is energy used most for in an endothermic reaction?
More energy is used to break bonds than making them.
What is energy used most for in an exothermic reaction?
More energy is used to make bonds than breaking bonds.
Examples of an exothermic reaction?
- combustion
- neutralisation
- hand warmer
Examples of endothermic reaction?
- freezing something
- photosynthesis
How can you calculate the energy released in a reaction?
CM🔺t.
Why is there less energy in the results than to begin with?
Heat energy is lost by the surroundings.
What are metallic bonds?
Metallic bond is the attraction between positive metal ions and the negative delocalised electrons.
