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Jouer Test
1. 
The change in the picture is
A.
Chemical change
B.
Physical change
2. 
The acid rain is the result of:
A.
All the gases of the atmosphere
B.
The oxids that dissolve in the rain
C.
The destruction of the ozone molecule
3. 
Select the only pure substance:
A.
B.
C.
4. 
Say the estequiometric coefficient for the hydrogen to balance the equation
A.
1
B.
2
C.
3
5. 
The density of water is 1g/mL. There is an object with a density of 1,2g/mL. Will it float or sink?
A.
it will float
B.
it will sink