Chemical changes Flashcards
What is a physical change?
a change in which no new substances is formed(reversible)
What is chemical change?
a change in which a new substance is formed(irreversible)
What is thermal decomposition?
a single substance breaks up into two or more simpler substances when it is heated
What is combustion?
a substance that reacts with oxygen when heated to form one or more new substances
What is oxidation?
addition of oxygen to a substance
What is electrolysis?
use of electricity to cause a chemical change
Word equation of thermal decomposition?
sugar > carbon + water vapour
Word equation of combustion?
carbon + oxygen > carbon dioxide + heat
Word equation of oxidation
magnesium + oxygen > magnesium oxide
Word equation of photography?
silver bromide > silver + bromine
Word equation of electrolysis?
copper chloride > copper + chlorine
Word equation of acids and metal?
acid + metal > salt + hydrogen gas
Word equation of acids and carbonates?
acid + carbonate > salt + carbon dioxide gas + water
Word equation of acids and alkalis(neutralisation)?
acid + alkali > salt + water
Litmus paper when the substance is acidic and alkaline?
From blue to red(acidic) From red to blue( Alkaline)
