Chem quiz 3 Flashcards
Describe the motion of particles in a gas
They move in random directions with a range of speeds
Complete the equation: metal carbonate + acid ——>
Metal carbonate + acid ——> salt + water + carbon dioxide
Describe the structure of graphite
Each carbon atom forms 3 covalent bonds with 3 other carbon atoms
The atoms form layers made of hexagonal rings
Outline a method for the formation and extraction of a soluble salt from an insoluble metal oxide/ carbonate and acid
Warm the dilute acid
Add the metal oxide/carbonate slowly and stir
Keep adding the metal oxide/ carbonate until no more can react
Filter with filter paper and a funnel
Pour the filtrate into an evaporating dish
Heat it to reduce the volume of water
Leave it to crystallise
Name the change of state from gas to liquid
Condensing
Explain why alloys can be harder than pure metals
They have atoms of different sizes
Which disturb the layers
And prevent them from sliding over each other easily
Name the products of a reaction between an alkali metal and water
A metal hydroxide and hydrogen
Explain why some gases(like chlorine) are produced slowly at first during electrolysis
They can react or dissolve into the water
Explain the effect of using a catalyst on the rate of reaction
They provide a different pathway for the reaction which has a lower activation energy
More particles have the activation energy
More particles can collide successfully
Rate of reaction increases
Is breaking bonds endothermic or exothermic?
Endothermic
Describe the arrangement of particles in a gas
Random arrangement
Explain why larger molecules have higher melting and boiling points than smaller ones
They have stronger intermolecular forces
Which require more energy to overcome
