Understanding relationships between energy, frequency, and wavelength

Calculate the amount of energy (in J) of a photon of light that has a frequency of 4.6x10E14 /s.

Understanding the relationship between energy and the principal quantum number

Calculate the wavelength of an electron (mass 9.11x10E-31 kg) traveling at a speed of 3.65x10E6 m/s.

Understanding periodic trends: atomic radius

Arrange the following atoms in order of increasing atomic radius: S, P, O

Understanding radioactive decay, half-life and nuclear chemistry.

If you start with 64 g of a material with a half-life of 10 years, how much will be left at the end of 40 years?

Understanding radioactive decay calculations, nuclear chemistry and half-life.

The half-life of Iodine-126 is 60 days. If the original sample had a mass of 50.0 grams, how much is left after 360 days?

Chemistry problems

1. how could you separate BaSo4 from NH4Cl? 2. how could you separate ZnCl2 from ZnS? 3. how could you separate TeO2 from SiO2? 4. how could you separate Naphthalene from potassium bromide? please explain the answers. thank you

Question: A discussion of soaps and detergents. The student should highlight the major differences between the two , and respond to the specific questions asked.Answer: Will provide the student with a detailed model answer.

BRAINMASS PROBLEM 9 1) State the difference between a soap, and a detergent? 2) What is the name for the alkaline hydrolysis of an ester? 3) Discuss the solubility of covalent compounds vs ionic compounds in polar and non polar media respectively. 4) Illustrate the mechanism by which soaps and detergents clean fibre ...continues

Conversion

If a patient has 0.08 ppm lead in their blood, how many micrograms would be contained in a liter of blood? (need to see how the problem is worked out)

Density

What is the density of a 100.000 grams cubic object that has a length of 0.025 meters?

Conversions

Convert 17.5 X 10 to the negative 5 power mm to pm.