Answer:
You need a mixture of positive and negative ions
Explanation:
Answer:
= 0.25 g MgSO4
Explanation:
0.10% implies that the solution will contain 0.1 g of magnesium sulfate, for every 100 mL of solution.
Therefore;
= 250 g × 0.1 g/100 mL
= 0.25 g MgSO4
The Atomic nucleus has a charge of 0.
Explanation: an atom consists of of positively charged nucleus, surrounded by one or more electrons (which are negatively charged.) The positive charges equal the negative charges so the atom ends up having no charge.
Answer:
D
Explanation:
Firstly in deciding whether the meniscus of a liquid in a glass capillary tube will be convex or concave, we need to understand 2 forces that are in play here. These are the adhesive and cohesive forces.
The cohesive forces are the forces between the molecules present in the liquid. It can be seen as the force of attraction between the molecules of the liquid
The adhesive forces are the forces between the molecules of the liquid and the molecules of the glass.
The reason why mercury has a convex meniscus is because the cohesive forces between the mercury molecules is greater than the adhesive forces between the molecules of the glass and molecules of mercury.
What we are saying in essence is that the intramolecular force of attraction between mercury molecules is greater than the intermolecular force of attraction between the molecules of the glass and water.
Hence we say mercury does not wet glass as the cohesive forces of attraction are greater than the adhesive attraction forces
