Physical and chemical changes

Question 1

what is the different between a chemical and physical change?

Answer 1

Physical changes

1. Original substance remain the same
2. atom/molecules are NOT re-arrangred
3. reversible
4. matter changes in size shape and colour

Chemical changes

1. New material is producted
2. Atoms are re arrangred to make new molecules - new substance
3. nonreversible
4. matter changes in odor,colour and mass

Question 2

what is changes when a physical and chemical is mixed?

Answer 2

phsyical
size,shape and colour

chemical
odor,colour and mass

Question 3

what did sheel wool rust in the container?

Answer 3

Rusting is a naturally occurring phenomnon when metal interacts/combines oxygon and water for a length of time. The only metals that rust and steel and iron

Question 4

why did the pennies tarnish when soaked in vinegar?

Answer 4

The vinegar (acetc acid) reacts with the copper to form a green coating called tarnish ( copper actate ) the copper becomes tarnish over time due to a combination of chemicals in the environment and vinegar.

Question 5

why did the bubbles of gas overflow when the baking soda and vinegar?

Answer 5

In this experiment, the baking soda, abase and vinegar, an acid react together releasing c02 gas, beacuse co2 is heavier then air it pushes the air out of the graduated cylinder as a foaming mass of bubble