1a) 2 properties that glass and plastic always share
1b) 2 properties that glass and plastic sometimes share
2) what advantages do bottles made from plastic have?
3) what disadvantages are there when you use plastic bottles?
4) why are plastic bowls not used for heating on a cooker?
5) what are the disadvantages of using metal for a toy for a baby?
6) why is plastic often used for children's toys?
7) what properties would you look for in materials to make a kite?

1a) Chemical inertness

1b) transparency

2) extremely less brittle

3) they can melt very easily under moderate heat.

4) they have low melting point

5) metals are hard, meaning they can easily injure a baby. Metals are good absorbers and radiators of heat.

6) they are less hard when compared to metals so they are less probable to cause injuries to kids.

7) material with very low density.

out of these options:

ability to burn paper

pure sodium reacting violently with water

the boiling point of water

helium does not tend to react with anything

i would say this is a physical property:

helium does not tend to react with anything

why? :

i said helium does not tend to react with anything because well, it reacts to ! but ability to burn paper, pure sodium reacting violently with water, & the boiling point of water are chemical or

physical properties: the properties of a substance that can be observed without changing the chemical makeup of the substance

chemical properties: properties of a substance relating to the chemical nature and reactivity of the substance