Flashcards in Chapter 6 Deck (39):
Gives out heat
Bases- pH level
High pH (8-14)
Base- universal indicator colour
Acids- pH level
Low pH (1-6)
Acids- universal indicator colour
Bases that dissolve in water
What do we use to determine the pH levels of acids and bases
Litmus paper and universal indicator
Pure water pH level
What else can be used as indicators
Veggies, example is red cabbage
Chemical equation for acid and base
Acid + base --> a salt + water
Example of a acid + base reaction
Sodium hydroxide + hydrochloride acid --> water + sodium chloride
Metal carbonate and acid reaction?
Metal carbonate + acid --> salt + water + carbon dioxide
When an acid and a base react with each other, producing a salt and water
What have caused the oceans to become acidic?
Rising levels of carbon dioxide in the atmosphere
What do oceans absorb?
When carbon dioxide dissolves in water, what if formed?
Why are carbon dioxide levels higher
Because of the increase of burning fossil fuels
What happens to the coral in the carbon filled oceans?
Coral is built from calcium carbonate, a weak base. When this reacts with the acid water, it slowly naturalises and crumbles away
Chemical equation for a metal and acid react?
Metal + acid --> hydrogen + salt
What causes acid rain?
Carbo dioxide in the atsmophere
PH level of acid rain
What is acid rain corrosive too?
Building materials, marble and limestone
The slow destruction of material as it reacts with its environment
How can we protect metals from rust and corrosion?
By painting or galvanising them
Metal and oxygen react to create...
Define a combustion reaction:
An exothermic reaction between fuel and oxygen that produces heat, carbon dioxide and water
Rust, a red-brown flaky substance
What do hydrocarbons contain?
Hydrogen and carbon
What can you purchase in Australia?
Petrol that contains alcohol
What is a biofuel?
Fuel made up of recently grown plants