G 7 matter 2

GR: water is not used to put out petrol fire

• because of the petrol density is grater than the water density thus petrol will float on the water surface

• because of the petrol density is lower than the water density thus petrol will sink under water surface

• because of the petrol density is lower than the water density thus petrol will float on the water surface

when substance floating on water surface this mean that its density is ................. the density of water

• grater than

• lower than

• equal

when immerse an iron piece in 50 cm3 of water the water level up to 60 cm3 hat is the mass of iron if the density of it equal 7.8 g/ cm3

• 780 g

• 0.78 g

• 78 g

calculate the density of a cube whose mass 80 g and its side length 2 cm

• 0.1 g / cm3

• 10 g/ cm3

• 100 g / cm3

calculate the density of a liquid if :

the mass of empty graduated cylinder = 60 g

the mass of the graduated cylinder and the sample = 90g

the volume of liquid = 30 ml

• 100 g/ ml

• 10 g/ ml

• 1 g /ml

anything has mass and volume

• density

• weight

• matter

the mass of an object divided by its volume

• mass

• density

• volume

density is a .............. properity

• chemical

• physical

• none

vinger and perfume can be distinguished by ........................

• colour

• taste

• smell

the unit of density .................

• g / ml

• g / cm3

• g / cm