Answer:
the electron cloud model is the current model of atom
B .combustion because HOH and CO2 are the products of complete combustion
Answer:
When iron is heated in air it reacts with oxygen to form the compound iron oxide. Iron is a solid and oxygen is a gas. 5 Draw diagrams to show how the atoms are arranged in iron, oxygen and iron oxide in the circles below their names. Use different colours for the iron atoms and the oxygen atoms.
Explanation:
<span>A physical change changes the bonds between molecules of the substance. so option a is right.</span>
