Chemical Changes Flashcards
(26 cards)
what is a chemical change
change where new substances are formed reactants interact to form products through matter interactions
how does a chemical change differ from a physical change
chemical change forms new substances with different properties and may give off heat or light physical change does not form new substances and properties stay the same
what is precipitation
process where an insoluble solid forms when two solutions or a solution and substance are mixed
what is a precipitate
the insoluble solid formed in a precipitation reaction
what happens when salt solution is mixed with another salt solution
a white precipitate silver chloride forms when sodium chloride is mixed with silver nitrate
what is the equation for silver nitrate and sodium chloride reaction
silver nitrate plus sodium chloride gives silver chloride and sodium nitrate
what happens when salt solution is mixed with an alkali
red brown precipitate ironIII hydroxide forms when sodium hydroxide is added to ironIII sulfate
what is the equation for ironIII sulfate and sodium hydroxide reaction
ironIII sulfate plus sodium hydroxide gives ironIII hydroxide and sodium sulfate
what is oxidation
reaction of a substance with oxygen forming a new substance the substance is oxidised
what is rusting
oxidation of iron in the presence of air forming ironIII oxide
what is the equation for rusting
iron plus oxygen gives ironIII oxide
what is respiration
oxidation of food like glucose to release energy for cells
what is the equation for respiration
glucose plus oxygen gives carbon dioxide and water
what is combustion
burning of substances in oxygen releasing heat and light
what happens in combustion of magnesium
magnesium burns in oxygen with white light forming magnesium oxide
what is the equation for combustion of magnesium
magnesium plus oxygen gives magnesium oxide
what happens in combustion of methane
methane burns in oxygen forming carbon dioxide and water
what is the equation for combustion of methane
methane plus oxygen gives carbon dioxide and water
how does oxidation differ from combustion
both involve oxygen but combustion needs heat oxidation may not
what is decomposition
breaking down of a compound into two or more substances
what is decomposition by light
silver bromide in camera film breaks into silver and bromine under light
what is the equation for light decomposition of silver bromide
silver bromide gives silver and bromine
what is thermal decomposition
heating glucose breaks it into carbon and water
what is the equation for thermal decomposition of glucose
glucose gives carbon and water
