4 Write the observation
1) Zinc oxide is heated strongly
) Mercunc oxide is heated strongly
10) Magnesium ribbon is heated in the non luminous flame
5. Compare the characteristics of a loud and a gas with respect to
intermolecular space
intermolecular force
number of free surfaces
6. Give resson
1) The rust iron weight is more than that of original metal
2)Heating Zinc oxide is a physical change
3) When magnetised iron is sted. x loses its magnetism
Answers
Answer:
4 Write the observation
1) Zinc oxide (ZnO) forms colorless hexagonal crystals or a white dusty powder. When heated, its color turns into lemon yellow changing into white again when cooled down.
10)The ribbon burns with a bright white light. Intense heat is also produced in this reaction. Here, when magnesium burns, it reacts with the oxygen found in air to form a powdery ash called magnesium oxide. Chemical equation: Magnesium plus Oxygen gives Magnesium oxide
5)Gas particles have broken away from the intermolecular forces that hold liquids and solids together. An alternative name for intermolecular forces is the van der Waals forces. They include London Dispersion Forces, dipole-dipole forces, and hydrogen bonds.On the basis of kinetic theory – Intermolecular space ... The force of attraction between the particles is strong. ... Liquids have less density as compared to solids because the number of ... Gases have least density as the number of particles is least and the intermolecular space is maximum. Free surface.
6.Give reason:
1) When iron or any other metal oxidizes, oxygen from the air combines with the iron to make iron oxide or rust. So, weight of the bar increases, due to the increased weight of oxygen which has combined with the iron.
2)Heating zinc oxide is physical changes because zinc oxide is a white powder the loss of oxygen makes it reversible chemical change so the oxidation takes place. Heating zinc oxide a physical or chemical change as well as Zinc oxide is a white powder.
3)A piece of iron ordinarily will be attracted to a magnet, but when you heat the iron to a high enough temperature (called the Curie point), it loses its ability to be magnetized. Heat energy scrambles the iron atoms so they can't line up and create a magnetic field—this Snack is a simple demonstration of this effect.
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