Topic 3,4&5 Flashcards
(30 cards)
Name the acid produced in the stomach
Hydrochloric acid
How do indigestion tablets work
They are an alkali which means they neutralise the excess acid in the stomach
What do you get when you react an acid with a metal oxide
Salt and water
Write the symbol equation for the reaction of hydrochloric acid with sodium carbonate
NaCO3 + HCl —-> NaCl + H20 + CO2
Is the anode positive or negative
Positive
How would you test for hydrogen gas
Put a lit splint in the test tube
Squeaky pop test
Name a product of the electrolysis of salt
Chlorine
When water undergoes electrolysis, what gases are given off
Oxygen and hydrogen
What is a metal ore
A metal that has reacted with another element
Explain the difference between oxidation and reduction
Oxidation is the gain of oxygen
Reduction is the loss of oxygen
Name two ways in which metals are often extracted from their ores
Heating with carbon
Electrolysis
What is bauxite
Is an aluminium ore, most common
Why are metals high in the reactivity series more likely to corrode
Because they’re more likely to react with water and oxygen which is what causes rust
Why are alloys harder than pure metals?
Because they have different sized molecules which create an irregular structure which means the layers don’t slip over each other
Give three reasons why it’s good to recycle metals
Less energy needed to make them useful
Uses less money
Uses less resources
What does crude oil consist of? What does fractional distillation do ?
Long chains of hydrocarbon molecules
Fractional distillation breaks down these long chains into smaller more useful ones
What is produced in the complete combustion of hydrocarbons
Carbon dioxide and water
Explain how incomplete combustion can be dangerous to humans
It produces carbon monoxide which if taken in combines irreversibly with haemoglobin in the red blood cells and decreases oxygen intake
Give four things you might want to consider when deciding on the best fuel to use
Energy value
Ease of ignition
Ash and smoke
Storage
What problems are associated with acid rain
Acidic lakes - killing plants and animals
Destruction of limestone building
List three ways of reducing acid rain
Remove sulphur dioxide before burning
Catalytic converters
Reduce our usage
What are greenhouse gases
Greenhouse gases are gases released that act like a natural insulation layer, they absorb heat that would normally be radiated into space and re-radiate it back to earth
List two ways in which human activity is increasing carbon dioxide levels
More people
More burning of fossil fuels
What are biofuels
Fuels made from the decomposition of dead organisms
