Solution: Mass of solute (salt) = 40 gMass of solvent (water) = 320 gWe know,Mass of solution = Mass of solute +Mass of solvent= 40 g + 320 g= 360 gMass percentage of solution= Mass of solute / Mass of solution ×100 = 40/ 360 ×100 =11.1%
The concentration of a solution is the amount (mass or volume) of solute present in a given amount (mass or volume) of solution. There are various ways of expressing the concentration of a solution, but here we will learn only three methods. (i) Mass by mass percentage of a solution = Mass of solute / …
A solution is a homogeneous mixture of two or more substances. You come across various types of solutions in your daily life. Lemonade,soda water etc. are all examples of solutions.Usually we think of a solution as a liquid that contains either a solid, liquid or a gas dissolved in it. But, we can also have …
Mixtures are constituted by more than one kind of pure form of matter. We know that dissolved sodium chloride can be separated from water by the physical process of evaporation. However, sodium chloride is itself a pure substance and cannot be separated by physical process into its chemical constituents. Similarly, sugar is a substance which …
Sublimation Substances around us change state from solid to liquid and from liquid to gas on application of heat. But there are some that change directly from solid state to gaseous state and vice versa without changing into the liquid state. Liquid state is not present in sublimate because melting point and boiling point are …
The temperature of the system does not change after the melting point is reached, till all the ice melts.This happens even though we continue to heat the beaker, that is, we continue to supply heat. This heat gets used up in changing the state by overcoming the forces of attraction between the particles. As this …
When a solid melts, its temperature remains the same, so where does the heat energy go? Read More »
Some ice-cold water in a tumbler. Soon we will see water droplets on the outer surface of the tumbler. The water vapour present in air, on coming in contact with the cold glass of water, loses energy and gets converted to liquid state, which we see as water droplets.
In an open vessel, the liquid keeps on evaporating. The particles of liquid absorb energy from the surrounding to regain the energy lost during evaporation. This absorption of energy from the surroundings make the surrounding. when pour some acetone (nail polish remover) on palm, then feel cool.The particles gain energy from your palm or surroundings …
Hidden heat to change state is known as the latent heat. The word latent means hidden. The amount of heat energy that is required to change 1 kg of a solid into liquid at atmospheric pressure at its meltingpoint is known as the latent heat of fusion.So, particles in water at 00 C (273 K) …
During summer, we perspire more because of the mechanism of our body which keeps us cool. We know that during evaporation, the particles at the surface of the liquid gain energy from the surroundings or body surface and change into vapour. The heat energy equal to the latent heat ofvaporisation is absorbed from the body …
