which is the correct electron configuration for the element Manganese (Mn)?
Mn 25 e- 1s2 2s2 2p6 3s2 3p6 4s2 3d5
Which element has the following electron configuration?
[Kr]5s 2 4d 10 5p 5
iodine (I)
keeping in mind that the cutoff in electronegativity difference between a covalent and and ionic bond is 1.67,
a. H2 O b. Li2 O
a. covalent bond types
b. ionic bond type
What happens to the valence electrons during the formation of an ionic bond? Or a covalent bond?
In an ionic bond, one or more valence electrons from one atom (the less electronegative one) are tranferred to the other atom (the more electronegative one).
Explain the connection between the type of intermolecular force (hydrogen bonding, dipole-diple forces, or London dispersion forces) and the strength of the intermolecular forces. A sample of molecules with which type of force is expected to have the lowest boiling point? Explain your answer.
Hydrogen bonding strongest higher bp
dipole-dipole forces
London dispersion forces weakest lowest bp
Describe London dispersion forces.
A nonpolar molecule forms a temporary dipole, which, increases a dipole is a nearby nonpolar molecule.
Explain why ice is less dense than water and therefore floats on water. Use a diagram if you want.
When liquid water freezes to ice, the positive end of the water molecule aligns with the negative end of a neighboring water molecule. Because the water molecule has a bent shape, there are big spaces in ice, making it less dense than water.
In the case of kool aid dissolved in water, name the solute, solvent, and solution.
Solute - powdered kool aid
solvent - water
solution - kool aid disovled in water
List the factors that affect the rate of solution of a solid in a liquid.
- temperature
- stirring
- surface area of solute
As shown in the following graph, the quantity of solute per 100g of water at a temperature of 50°C for NaNO3 will be ________.
120g solute per 100g of H2O
Which has molecules with more kinetic energy, ice or liquid water?
molecules of liquid water have more kinetic energy than molecules of ice.
Is the following reaction endothermic or exothermic? CH4 (g) + 2O2 (g) → CO2 (g) + 2H2 O(g) ΔH= -890.4 KJ
Because △H is negative, it is exothermic