chem mistakes

Why can metals conduct but not covalent compounds

Test for ammonia

Moist red litmus turns blue

Finish the word chem

istry

What conclusion can be made about ink that doesn’t move up in chromatography and how to find the composition of it

It is insoluble in the solvent, you need to repeat using a different solvent

Formula for Rf value of dye

Distance from bottom to dye mark/distance solvent travelled

Explain how the combustion of a common impurity in fuels may cause an environmental problem

sulfur is a common impurity in fuels

Combustion of sulfur creates sulfur dioxide

Sulfur dioxide dissolves in rainwater to form acid rain

State chemical name for rust

Iron (III) oxide

Colour change that occurs for copper(II) carbonate thermal decomposition

Green to black

Charge of carbonate

CO3 2-

What does metal+acid form

Salt+ hydrogen

State an environmental problem caused by carbon dioxide

Global warming

Give a similarity and difference between how potassium and caesium react with water

Similarity they both create effervescence

Difference caesium reacts more vigourouslu

How to improve accuracy of an experiment of measuring temp change in a polystyrene cup

M1 stir solution

M2 to obtain more accurate (maximum) temperature

OR

M1 measure temperature of sodium hydroxide

M2 to check if different to/same as temperature of

(hydrochloric) acid

What type of reaction is this metal oxide plus acid becomes salt and water and state what happens in terms of protons

Neutralisation acid donates protons

Describe method to prepare a saturated solution of copper (II) sulfate using copper carbonate and acid

State