Answer:
A molecular formulae________
will tell you how many and what
kinds of atoms are in a molecule, but not how they are
arranged.
How to find net force
The net force is the vector sum of all forces act upon an object.
The formula to calculate net force is Fnet = ma
where the net force is equal to the mass of an object (in Kg) multiplied by the acceleration of the object (in meters per second squared)
You may also calculate the net force acting upon an object with Fnet = Fa + Ff
where the net force is equal to the sum of the applied force and the force of friction.
hope that helped
Answer:
iron, graphite,NaCl solution etc are some examples of good conductor of electricity
We know that ionic radii trends have the elements ionic radii increasing right to left in a row and top to bottom in a group with Groups 13-18 having their respective exceptions.
That being said, since Ca2+ and Mg2+ are in the same group, we know that Mg2+ has a smaller radius that Ca2+.
So Mg2+ < Ca2+
And we know that Cl- and S2- are both two large atoms, due to them being found in group 17 and 16 respectively. Both of these atoms have a larger radius than Ca2+ due to them being an exception.
So we can write: Mg2+ < Ca2+ < Cl- and S2-
One way to know the exact figures for sure is to have a table on hand with all of the ionic radii. Using a table, we know that the actual ordering of the atoms is:
Mg2+< Ca2+ < Cl- < S2-
Therefore, Mg2+ has the smallest ionic radius.
Answer:
Calculate the mass percent of a potassium nitrate solution when 15.0 g KNO3 is dissolved in 250 g
of water.
2. Calculate the mass percent of a sodium nitrate solution when 150.0 g NaNO3 is dissolved in 500 mL
of water. Hint: 1 mL water = 1 g water
3. Calculate the weight of table salt needed to make 670 grams of a 4.00% solution.
4. How many grams of solute are in 2,200 grams of a 7.00% solution?
5. How many grams of sodium chloride are needed to prepare 6,000 grams of a 20% solution?
Mass Percent = Grams of Solute
Grams of Solution X 100%
100%
Grams of Solute = Grams of Solution X Mass Percent
= 26.8 grams NaCl
= 670 grams X 4.00%
100%
100%
Grams of Solute = Grams of Solution X Mass Percent
= 154 grams solute
= 2,200 grams X 7.00%
100%
100%
Grams of Solute = Grams of Solution X Mass Percent
= 1,200 grams NaCl
= 6,000 grams X 20.0%
100%
Explanation: