Question

pls answer me now its importand because my test onwards ​

Answer 1

Answer:

it is choice.., so I am answering only this..

Section A

1) Mass Percent

, which is the grams of solute per 100 g of solution. Sometimes you may want to make up a particular mass of solution of a given percent by mass and need to calculate what mass of the solvent to use.

Answer 2

Answer:

YOUR ANSWER

                              Section -A

1. mass percent of solution refers to The mass percentage of a component in a solution is defined as the mass of solute present per 100 grams of the solution.

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1.The hard substance is a metal. Actually metals are sonorous and produce tinkling sound when bent.

2.  Iron pins can be separated from the sand by a magnetic separation method. Since iron has a strong magnetic property it can be isolated using strong magnets.

3. The plasma membrane is called a selectively permeable membrane as it permits the movement of only certain molecules in and out of the cells. It allows hydrophobic molecules and small polar molecules diffuse through the lipid layer, but does not allow ions and large polar molecules cannot diffuse through the membrane.