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What is the key difference between a physical change and a chemical change?
How can you determine whether a new substance has been produced?
Give an example of a physical change that has the ability to produce gas?
How can you determine the properties of a substance?
What happens during a chemical change?
What is a chemical reaction?
What is the difference between a chemical reaction and a chemical change?
Identify the reactants and products in the following equations:
1- hydrogen gas+Chlorine gas= Hydrogen chloride gas
2- glucose+oxygen gas= carbon dioxide+ water vapour
SHOW THE REACTANTS AND THE PRODUCTS
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What is combustion?
Give an example
What is one advantage of a combustion for prehistoric humans?
What is photosynthesis? and what is its word equation?
What is respiration? and what is its word equation?
Why is respiration such a crucial chemical reaction?
Why is it that after a long race, athletes are exhausted?
What is chemical weathering?
list any four physical properties.
List some flammable substances and their use
What is corrosion? and what is the word equation for rust?
>>>>>Tricky Question<<<<<
"When methane gas is burnt in oxygen they produce carbon dioxide and water . Use a word equation to describe this reaction."
