Answer:
atomic number of elements increases, the melting point increases because there are more electrons around the nucleus, which creates a stronger negatively-charged force. With stronger forces, the melting point rises. 3. Non-metals usually have low melting points.
The Lewis formula refers to a diagram showing the distribution of electrones and in case of a molecule it also shows the bonds.
The structural formula on the other hand is a representation of the molecular structure that shows all the atoms that form the molecule, arranged in a three dimentional space,
In this case we have the hydrogen ion, which is the simpliest case we can have.
Hydrogen ion is the hydrogen atom possitively charged as it has lost his electron. Therefore the structural formula is simply the following:
The Lewis formula is also very simple as this ion has no electrons and has no bonding to other atoms:
Answer:
Valence electrons. they can be used to determine the group of an element.
Explanation:
Energy is not required for the passenger molecule to be carried across the cell membrane by the carrier molecule simply because they are moving down a concentration gradient, that is to say movement is from an area of high concentration to an area of low concentration.
When particle move from areas of high concentration to areas of low concentration, they do not need energy. For example this is how the aroma of cooking spreads from the kitchen (higher concentration) to all the other rooms in the house.
Answer:
B. As the temperature of a solution changes, its volume will also change, which will affect its molarity but not its molality.
Explanation:
Molality is given by the following equation:
While the molarity formula is given as
The volume of solvent changes with temperature so it will be impractical to use molarity as it accounts for the volume of solution in its formula, which will create an error. Molality, on the other hand, uses Kg of solvent; which is not dependent on temperature. Hence, its value will not change