Chemical Reactions

Questão	Responda
What is an atom?	The building blocks of all matter
What is a chemical change?	A change where new substances occur
What happens during a chemical change to the atoms?	They rearrange to form new substances
What are reactants?	The starting substances in chemical reactions
What are products?	The substances formed in chemical reactions
What is combustion?	When a substance is burnt in oxygen
What happens when nitric oxide is burnt with ozone?	Nitrogen dioxide and oxygen gas are produced
Energy in chemical reactions	Atoms are held together by chemical bonds that store energy. Energy is released when batteries are used
What is a spontaneous chemical reaction?	Chemical reactions that proceed by themselves
Give an example of spontaneous reactions	Rusting
What are non-spontaneous reactions?	Reactions that need constant energy
Give an example of non-spontaneous reactions	Hydrogen fuel cell
What is a chemical equation?	A short hand way of showing how chemical reactions work
What is corrosion?	Reactions between metals and environmental chemicals
What is rusting?	Corrosion of iron
How can you prevent rust?	Coating, galvanising and alloying
What is coating?	Covering iron with another metal or paint
What is galvanising?	Covering iron with zinc metal
What is alloying?	Mixing iron with other metals or carbon
What happens when iron corrodes?	The protecting layer of iron is corroded away and makes the iron underneath flake away

Resumo de Recurso

	Criado por Hamza Ahmed mais de 8 anos atrás