Unit 1, Chemical reactions Flashcards
What happens in all chemical reactions?
A new substance is formed
State 5 physical properties of metal.
Shiny Conducts heat Conducts electricity Malleable Ductile
How would you extract a reactive metal from its ore?
electrolysis
How would you extract a somewhat reactive metal from its ore?
heat with carbon
How would you extract an unreactive metal from its ore?
Heat
Reactive metals form very stable/unstable compounds so are difficult to extract
Stable
State different methods of protecting iron for rusting.
Painting
Oiling
Sacrificial protection
In sacrificial protection, do you use a more or less reactive metal?
more reactive metal
State the four conditions which can be changed to effect the rate of reactions
Particle size
Temperature
Concentration
Catalyst
How are more reactive metals stored?
in oil
State the general equation for metal with oxygen
metal + oxygen → metal oxide
Give uses for some metals.
iron → tables,chairs, railing
good and silver → jewellery
Describe the test for hydrogen gas
it burns with a pop
Name an example of an ore and the metal it contains
malachite→copper carbonate →copper
What is an ore?
A naturally occurring compound containing a metal
Describe the reaction of metal with water
metal + water → metal hydroxide + hydrogen
Balance this chemical equation
Na + Cl2 → NaCl
2Na + Cl2 → 2NaCl
Write a word equation for the reaction between oxygen and hydrogen forming water
oxygen + hydrogen → water
Is wool growing on a sheep a chemical or physical reaction?
chemical
Is water evaporating a chemical or physical reaction?
physical
State the different signs of a chemical reaction
a gas is produced
precipitates
produces heat/cold
colour change
What is the general equation for the reaction between metal and acid
metal + acid → salt + hydrogen