A quantity of pure water has a volume of 20 cm3 at a temperature of 4°C. What is its mass?
100g
20g
200g
10g
At what temperature is the cubic meter of pure water has the largest mass
4°C
10°C
80°C
25°C
In liquids with low density, a smaller part of the hydrometer is submerged
False
True
relative density is the ratio of the density of a certain substance to the density of pure water at the different temperature .
Salinity expresses the amount of salt dissolved in the water, as the normal rate of salinity of ocean water is ............
359/l
953/ml
539/ml
359/ml
At what temperature is the kilogram of pure water has the largest volume
In the opposite figure, two solid cylinders of the same metal and have the same diameter, one of them is longer than the other at the same temperature, so the equal quantity for the two cylinders is
Mass
Density
Weight
Volume
In an experiment to measure the extent of pollution in swimming pool water, two samples B, A were taken at the same time from the swimming pool, their volumes are 40 cm3, 10 cm3 respectively, so it is expected that the ratio of the density of water in sample B to The density of water in sample A is equal to
4/1
The answer cannot be determined
2/1
1/1
Two samples of pure water and water with dissolved pollutants can be distinguished at the same temperature by measuring
The volume of each
The mass of each
The density of each
The weight of each
The mass of a unit volume of the substance .......
weight
volume
fluid
density
A quantity of pure water has a mass of 100 g,Its volume at 20°C is
Greater than 100cm3
100cm3
Less than 100cm3
The hydrometer is used to measure the density of liquids and the relative density of liquids
Which of the following factors does not directly affect ocean currents?
The difference in the types of marine organisms
The difference in the degree of salinity of water
The difference in the temperature of water
The difference in water pressure
Water currents in the oceans are the movement of water from one area to another and carry with it ..........
Heat and salt
Nutrients
Fresh water
All of the above
The factors on which the density of the substance depends are....
Mass of molecules and Distances between molecules
Degree of purity of the substancea and Temperature
Distances between molecules
A quantity of pure water with a volume of 1m3 at a temperature of 4°C is cooled until it freezes, then the amount of increase in the volume of this quantity when it turns into ice with a density of 917kg/m3 is approximately equal to
0.04m3
0.09m3
0.06m3
0.03m3
In the opposite figure .
the density of water at point X is greater than its density at point Y
the density of water at point Y isequal to its density at point X
the density of water at point Y is greater than its density at point X
If the volume of 1 kg of pure water at a temperature of 4°C is V1 and the volume of 1 kg of pure water at a temperature of 2°C is V2, then the ratio (V1/V2) is
Equal to one
Less than one
Greater than one
The ability of the material to flow and not take a fixed shape is one of the properties of
Solid and liquid materials
Solid, liquid and gaseous materials
Liquid and gaseous materials
Solid and gaseous materials
Units of measurement of density
g.l -1
N.m-3
Kg cm-1
g.mm-1
The density of pure water in international units at 4°C is equal to
1g/cm3
1000g/m3
1000kg/cm3
1000kg/m3
If you know that the relative density of mercury is greater than the relative density of alcohol at the same temperature, then the ratio of the mass of 1 cm3 of mercury to the mass of the same volume of alcohol is
A quantity of pure water has a mass of 100 g. Its volume at 4°C is
100 cm3
Relative density has a unit of measurement, while density does not have a unit of measurement.
What happen When the temperature of pure water rises from 4°C to 10°C relative to its density...
The distances between the molecules increase, so the volume of the liquid increases with the constancy of its mass and its density increases
The distances between the molecules increase, so the volume of the liquid increases with the constancy of its mass and its density decreases
The distances between the molecules decrease, so the volume of the liquid increases with the constancy of its mass and its density decreases
The density of pure water reaches its maximum value at
104°C
0°C
100°C
Water has unique physical properties that distinguish it from other liquid fluids, including a ...............
decrease in its density when the temperature and specific heat are lowered from 4°C to 0°C
decrease in its volume when the temperature and specific heat are lowered from 4°C to 0°C
decrease in its density when the temperature and specific heat are higherd from 4°C to 10°C
increase in its density when the temperature and specific heat are lowered from 4°C to 0°C
What happens to the molecules of pure water when its temperature decreases from 4°C to 0°C
Move away from each other
Approach each other
Its volume decreases
Remain constant from its position
The hydrometer is used to predict the presence of dissolved pollutants in water by ........ measurement method
which of the followings is true
When the temperature of pure water decreases, the distances between the molecules decrease, so the volume increases and the density of water decreases
When the temperature of pure water increases, the distances between the molecules decrease, so the volume decreases and the density of water decreases
When the temperature of pure water decreases, the distances between the molecules increase, so the volume increases and the density of water decreases
When the temperature of pure water increases, the distances between the molecules increase, so the volume increases and the density of water decreases