Flashcards in Unit 2 Deck (46)
How are insouble salts made ?
By the precipitation reaction between 2 solutions
How is a salt formed?
When the hydrogen ion is removed from an acid and replaced by a metal ion.
What is a fuel ?
A fuel is a substance that burns releasing energy
How is a fossil fuel formed (coal)
When trees died and fell into swamp land. A build up of layers over millions of years.
How is oil and gas made
The remains of sea creatures and plants died and sunk to the sea bed. Build up of layers over millions of years.
What does incomplete combustion produce
Carbon dioxide, water and carbon monoxide
Spot can also be produced
What is a homogous
A family of chemical compounds with the same general formula + similar chemical + physical properties
What is an alkanes general formula
What is the general formula for alkenes
What is the general formula for cycloalkanes
What’s the formula for methyl
What’s the formula for ethyl
What is the test for saturation
Adding bromine water (brown) to an Alkene will make the solution decolourise rapidly
An alkane takes much longer
A hydrocarbon with no c=c is said to be
(Alkanes and cycloalkanes)
A hydrocarbon with at least 1 c=c is said to be
What is an isomer
Molecules which have the same molecular formula but have a different structural formula or
The same number of carbons and hydrogens but a different shape
What do alkenes use in Addition reactions
Hydrogen, halogens and water
Addition reactions with hydrogen is called
Addition reactions with halogens form
Addition reactions with water is called
Addition reactions with water form
What are carbohydrates
Compounds that contain the elements carbon, hydrogen and oxygen
Do carbohydrates provide energy
What is the test for sugar
Add Benedicts and place in a hot water bath.
If sugar is present then the colour changes from blue to orange.
What is the test for starch
Adding iodine to starch produces the colour change from brown to blue/black.
What can a carbohydrate be used for
For energy or can be used to produce fuels such as alcohols.
What is the equation for fermentation
Glucose ——> ethanol + carbon dioxide
What heat is fermentation carried out at
What does distilling alcohol do
Removes water and increases the alcohol content