The properties of mixture are _________ from its components.
A mixture is a material made up of two or more different substances which are physically combined. Despite the fact that there are no chemical changes to it's constituents, the physical properties of a mixture, such as it's melting point, may differ from those of the components.
Which of the following is a colloidal solution?
A mixture of water and starch is colloidal because it forms a shell of firmly bound molecules of water that stops the starch particle from aggregating with the molecules of water when they collide.
Which of the following is a colloid?
Which of the following is a physical change?
When iron and sulphur are heated at high temperature
Which of the following has the highest solubility at 293 K?
The size of the colloidal particle is in the range of
Which of the following statements is true?
Which out of the following is a heterogeneous mixture?
The size of particles of true solutions is
The cause of Brownian movement is
Brownian movement arises because of the impact of the molecules of the dispersion medium with the colloidal particles. Since the impacts of the molecules of the dispersion medium on the colloidal particles are unequal (i.e. unbalanced bombardment), the result is zig-zag motion.
40 g of common salt is dissolved in 320 g of water. The mass percentage of salt is
Mass of common salt (solute) = 40g
Mass of water (soluted) = 320g
Mass of solution = 320 + 40 = 360g
Concentration of solution = M(mass of solute) / mass of solution = 40/360 x 100 = 11.11%
Which of the following is not a compound?
Lead (Pb) is not a compound. It is an element present in its pure form so it is a single homogeneous identity. Compounds have two or more elements present in the uniform composition in the compound state.
The particles of suspension
Which of the following statement is true about compounds?
The particles of colloidal solution can be separated by
e correct answer is c
The process by which we can separate the particles of a colloidal solution is called Centrifugation.
Which of the following statement is always true when a substance undergoes physical change
What is the percentage of fat present in milk of full cream?
The correct answer is a
Full-fat milk is standardised to 3.5% of fat and semi skimmed milk contains approximately 1.5% fat. Skimmed milk and buttermilk are very low in fat and, on average, contain 0.1 or 0.2% fat respectively.
Which of the following is heterogeneous?
Kerosene oil and water can be separated by