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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?

Subject:

Chemistry

Topic:

General Chemistry

Posting ID:

7525

OTA ID:

102792

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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

Subject:

Chemistry

Topic:

General Chemistry

Posting ID:

7643

OTA ID:

101395

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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 fibres. 5) Why does scum form in hard water areas. Why is this a problem, and how can it be overcome? 6) Some detergents are non biodegradable. What common structural features make a detergent non-biodegradable? 7) Which kind of structural features, seen in soaps and some synthetic detergents are readily biodegradable?

Subject:

Chemistry

Topic:

General Chemistry

Posting ID:

7653

OTA ID:

103744

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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)

Subject:

Chemistry

Topic:

General Chemistry

Posting ID:

7732

OTA ID:

103127

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Density

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

Subject:

Chemistry

Topic:

General Chemistry

Posting ID:

7775

OTA ID:

101374

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