Chemistry - May 2007

1. Explain how electron shielding affects the general trend in radii of atoms of e1ements going from left to right across a period in the periodic table.

2. Explain why hydrogen behaves differently from other elements, and give some examples of the kinds of compounds hydrogen forms.

3. A factory in your town uses cadmium as part of its manufacturing process. Due to recent economic conditions, cadmium is no longer available, and you must find a replacement. Suggest two elements that might be good replacements. Which of these would be your choice? Explain why.

4. Compare the role of nuclear fusion in the formation of Earth’s naturally occurring elements and in the creation of synthetic elements in the laboratory.

2007-05-28 12:01:17 · 2 answers · asked by Anonymous

How do you find the percent composition of casein when it's isolated from milk.

2007-05-28 12:00:49 · 1 answers · asked by amanda f 2

1. Explain how film badges, Geiger-Muller counters, and scintillation detectors are used to detect radiation and measure radiation exposure.

2. How is the age of an object containing a radioactive nuclide estimated?

3. How is the fission of a uranium-235 nucleus induced?

4. How does the fission of uranium-235 produce a chain reaction?

5. Describe the purposes of the five major components of a nuclear power plant.

6. Describe the reaction that produces the sun's energy.

7. What is one problem that must be overcome before energy-producing controlled fusion reactions are a reality?

2007-05-28 11:56:39 · 1 answers · asked by Anonymous

2007-05-28 11:40:53 · 5 answers · asked by michelle m 1

how do you find the percent composition of casein when it is isolated from milk?

2007-05-28 11:27:34 · 1 answers · asked by amanda f 2

This is for a chemistry scavenger hunt. Everything has to be found in the house or be a household product. I know what an acid anhydride is, but I don't know any drinks that contain acid anhydrides.
I was thinking it could be any of those powder drinks. Such as Koolaid or powdered lemonade. Where you have bags of powerder, and when you add them to water, it makes a drink.
I'd appreciate any help I can get. Thanks.

2007-05-28 11:19:03 · 1 answers · asked by shadowsamurai192000 1

2007-05-28 10:56:12 · 1 answers · asked by abd elmoniem m 2

2007-05-28 10:37:57 · 1 answers · asked by Anonymous

2007-05-28 10:37:28 · 1 answers · asked by theweirdguy1 2

2007-05-28 10:29:40 · 1 answers · asked by Anonymous

2007-05-28 10:27:52 · 3 answers · asked by chemprincess5 2

2007-05-28 10:11:23 · 1 answers · asked by analiz o 1

What would be the freezing-point depression of benzoic acid caused by the addition of 0.005 mol (0.76 grams) of camphor?

2007-05-28 10:01:28 · 1 answers · asked by theweirdguy1 2

Why can't you wash the precipitate with water when you filter saturated calcium hydroxide solution? Washing has always been customary when you filter to obtain a pure sample of a solid material. What is the reasoning?

Thanks!!!

2007-05-28 09:34:37 · 4 answers · asked by Ethernaut 1

When studying metallography you always start with crystallography, but what's the practical use of it?. Can you actually see the crystal shape or pattern in a metallographic micrograph? I have taken several micrographs of some steels and I can recognize graphite nodules in a ferritic envelope and a pearlite substrate... How can I determine the crystal nature of a specific phase... or how does it helps me to know a certain crystal is cubic face centered to practically identify the metallographic composition or a fracture mechanism in a metallographic sample. (It is an actual question, not retorical, please forgive me if I sound too naive)

2007-05-28 09:28:53 · 1 answers · asked by Manuelon 4

How many grams of 0Celcius ice can be converted into 0 Celcius liquid water by the addition of 100. kJ of heat energy? (ΔH°fus= 6.02 kJ/mol)

2007-05-28 09:22:56 · 2 answers · asked by carla 2

2007-05-28 09:15:17 · 9 answers · asked by prettygirlalfred 1

Out of a group of elements how can we tell which is the best or worst oxidizing/ reducing agent?

2007-05-28 09:08:21 · 2 answers · asked by Cassandra C 1

I WANT TO KNOW WHAT MATERIALS ARE USED FOR PRODUCING ACID ASCETIC IN FACTORY IN SENTETIC WAY?

2007-05-28 09:04:12 · 3 answers · asked by mehrdad2l 1

when i turn on the gas fire it burns green

2007-05-28 09:03:26 · 4 answers · asked by markhendriksen 1

Can someone please answer these questions and explain the reason for the chosen answers? Thanks!

1) One mole of each of the following substances is disolved in 1.0 kg of water. Which solution will have the lowest freezing point?
(a) NaC2H3O2
(b) NaCl
(c) MgCl2
(d) CH3OH
(e) C6H12O6

2. how is high or low freezing/boiling point determined?

3. Given the following reactionat equilibrium: Fe+3(aq) + SCN-(aq) --> FeSCN+2 Which of these would shift the equilibrium to the left?

(a) Adding FeCl3 to the reaction
(b Adding NH4SCN to the reaction
(c) Increasing the pressure on the reaction
(d) adding a catalyst
(e) Adding FeSCN+2(aq) to the reaction

4) Enough AgCl(s) is dissolved in water at 298K to produce a saturated solution. The concentrationof Ag+1 ions is found to be 1.3x10^-5 M. What is the Ksp value for AgCl?

Please answer the ones you can!

2007-05-28 09:00:41 · 2 answers · asked by Cassandra C 1

With NaHCo3 and NaCL etc.

2007-05-28 08:56:56 · 1 answers · asked by Anonymous

per gram per degree C. Calculating the energy required to melt 5.0 moles of silver if it starts as a solid at 25degree C below its normal melting point and is heated to exactly 0.01 Celsius degree above it normal melting point

2007-05-28 08:54:48 · 2 answers · asked by BIG X 2

per gram per degree C. Calculating the energy required to melt 5.0 moles of silver if it starts as a solid at 25degree C below its normal melting point and is heated to exactly 0.01 Celsius degree above it normal melting point

2007-05-28 08:53:39 · 1 answers · asked by BIG X 2

Is aniline soluble in sodium hydroxide/? is there a reaction between the two? plz help!

2007-05-28 08:51:28 · 1 answers · asked by X 2

2007-05-28 08:51:11 · 3 answers · asked by Ola S 1

does it dissolve completely/ instantly or partially? and is there a reaction between the two?

2007-05-28 08:50:00 · 1 answers · asked by X 2

A character in my novel (a teenager who goes back in time) combines sulfur, bat guano, and charcoal or honey to make an explosive. Gunpowder was made out of these in the civil war, for example. Where would my character find the sulfur?

2007-05-28 08:49:14 · 3 answers · asked by Rob S 3

what are illegal pH values and tell me the substance that goes along with the value no im not doing anything illeal bu im into ferensics and have a pH meter but dont kbow what the substance is that goes along with the values.

2007-05-28 08:43:30 · 2 answers · asked by Anonymous

from carbon dioxide and water, producing oxygen as the remaining product. In an experiment, 500ml of oxygen was produced in an experiment. The oxygen was collected over water at 27degree C and at a pressure of 786 Torr. The vapor pressure of water at 27 degree C is approximately 26mm Hg. What mass of glucose was produced. How many grams of water were used in this biosynthesis?

2007-05-28 08:41:46 · 1 answers · asked by BIG X 2