Science & Mathematics - 22 December 2006

2006-12-22 10:49:57 · 14 answers · asked by George 3 in Mathematics

2006-12-22 10:49:44 · 12 answers · asked by jeremy c 1 in Astronomy & Space

14.Ammonium sulfate,(NH4)2SO4,is a common ingredient in fertilizers and is a source of nitrogen.
a.Would you calculate the atomic mass, molecular mass, or formula mass of ammonium surfate? Explain how you came to your decision.
b.What is this value for (NH4)2SO4?
c.Avogadro’s number is equal to 6.0221x10 23. How may ammonium ions are in 100.0g of ammonium sulfate?
d.You make a solution of ammonium sulfate by mixing 150 g of(NH4)2SO4 in 2.00 L of water in a beaker. What is the molariry of the resulting solution assuming that all of the solute dissolves?

2006-12-22 10:47:37 · 2 answers · asked by kittyvamptress 2 in Chemistry

A cell is lacking in its supply of amino acids. Which of the following will occur?
A.
mRNA will not be formed because enzymes may not be present.

B.
The ribosomes will not work properly because there will be no proteins.

C.
tRNA may not be able to fulfill its job.

D.
all of the above

2006-12-22 10:39:19 · 8 answers · asked by yay y 1 in Biology

Which of the following occurs after mRNA is transcribed?
A.
It remains in the nucleus.

B.
It becomes part of the nucleolus.

C.
It enters the cytoplasm and moves toward ribosomes.

D.
It leaves the cytoplasm through the cell membrane.

2006-12-22 10:38:17 · 2 answers · asked by yay y 1 in Biology

im just want to know, lol.

2006-12-22 10:36:13 · 5 answers · asked by Ryu H 2 in Geography

is there some type of trick in math

2006-12-22 10:34:45 · 12 answers · asked by ♫ 2 in Mathematics

15.A 0.200 L solution of .950M hydrochloric acid is used to neutralize a 10.0 g sample of calcium hydroxide in a coffee-cup calorimeter. Calcium hydroxide solution is known as slaked lime and is used in agriculture to “sweeten” acidic soils. The temperature in the calorimieter was observed to rise from 20.0*Cto29.2*C during the course of the neutralization. Assume that the density of the hydrochloric acid solution is 1.00g/mL and that the specific heat capacity of the system is the same as that for water,4.18J/g-K.Assume that only the water is available to absorb or release heat and that the reaction is at constant pressure.
2HCI(aq)+Ca(OH)2(aq)------CaCI2(aq)+2H20(I)
a.What was the limiting reagent in the neutralization reaction? Provide support for your answer.
b.How many moles of excess reagent were left over?
c.If 5.1 g of calcium chloride were obtained after the neutralization was complete, what was the percent yield?
d.What was the enthalpy change for the system in the coffee-cup calorimeter?
e.What was the heat of reaction per mole of water produced for the neutrailization reaction?

2006-12-22 10:34:38 · 3 answers · asked by kittyvamptress 2 in Chemistry

2006-12-22 10:30:01 · 16 answers · asked by Faizy 1 in Weather

2006-12-22 10:29:29 · 21 answers · asked by max l 1 in Other - Alternative

2006-12-22 10:26:34 · 7 answers · asked by friedyams 1 in Mathematics

2006-12-22 10:26:10 · 17 answers · asked by James M 1 in Astronomy & Space

If sperm is a prokariotic cell then it doesn't have a Nucleus. If it doesn't have a Nucleus then how does it transport DNA?

2006-12-22 10:24:04 · 4 answers · asked by Tyron 2 in Biology

2006-12-22 10:23:05 · 3 answers · asked by iheartyoumorethanbunnyz 1 in Chemistry

my boyfriend makes 2800 dollars a month
i make 1080 dollars a month
with a combined income of 3880 dollars together a month.
based on the amount we each bring home, please help me calculate what percentage and amount he owes to our rent and bills and help me calculate what percentage and amount I have to pay towards our monthly rent and bill expenses of $868 a month. be detailed thank you. sorry im asking this might be easy for some people but i have only grade 9 education.

2006-12-22 10:18:59 · 9 answers · asked by chocolate_cat 3 in Mathematics

2006-12-22 10:17:54 · 11 answers · asked by ♫ 2 in Chemistry

Jessica's mother has the blood type AB and her father has the blood type O. Which blood type could Jessica have? Draw a Punnett square on scratch paper to help you answer the question, if needed.
A.
A

B.
AB

C.
O

2006-12-22 10:17:39 · 4 answers · asked by yay y 1 in Biology

What is the best graduation of a cylinder to measure medium volumes...
It needs to be a cylinder with small graduations (measurment between each mark on the cylinder)

Pleasssssse Help
Tthanks

2006-12-22 10:16:20 · 3 answers · asked by daniel4joyce 2 in Chemistry

Suppose you cross a true-breeding blue flower with a true-breeding yellow flower. In the next generation, all of the flowers are blue. What does this outcome tell you about the allele for blue flowers?
A.
The blue allele is sex-linked.

B.
The blue allele is recessive to the yellow allele.

C.
The blue allele is dominant to the yellow allele.

D.
The blue allele shows incomplete dominance.

2006-12-22 10:16:15 · 4 answers · asked by yay y 1 in Biology

the scientific name is Ambrosia hispida

2006-12-22 10:12:04 · 3 answers · asked by albertobritez 1 in Botany

A plane leaves New York for San Francisco and averages 800 km/h. At the same time, a plane leaves San Francisco for New York and averages 880 km/h. If the two cities are 5040 km apart, in how many hours will the planes pass each other?

A. 2.5

B.3

C.3.5

D.2

2006-12-22 10:11:32 · 3 answers · asked by mike 1 in Mathematics

2006-12-22 10:08:59 · 4 answers · asked by Fo-Shizzle 1 in Geography

2006-12-22 10:08:03 · 6 answers · asked by kennychen 2 in Chemistry

What do you get when you cross a 1 hump camel with a 2 hump camel? If you get a 1 1/2 hump camel, what happens when you mate 2 of those 1 1/2 hump camels?

2006-12-22 10:07:23 · 4 answers · asked by sweetsinglemom 4 in Zoology

Iron metal is recovered from passing carbon monoxide over teh iron ore (Iron III Oxide) forming carbon dioxide and iron metal

Balance teh reaction equation
it would be Fe2O3--->CO+Fe???

When 116 g of CO reacts with excess Fe2O3, how many moles of Iron metal is recovered with a theorectical yield
116 divided by number of moles of Fe2O3 times 100 to get theorectical yield

If the process is not efficient, only 80% yield of Fe is recovered. How many grams would you recover from 116 gm of CO.
116 times 80% to get number of grams

2006-12-22 10:04:02 · 3 answers · asked by silentcargo 3 in Chemistry

A.
the possible combinations of alleles in offspring based on the parents' genetic makeup

B.
that both parents show characteristics of the dominant trait

C.
how to assemble a genetic map of the chromosome on which the alleles are located

D.
the full pedigree of the geraniums

2006-12-22 10:03:27 · 7 answers · asked by Jonathan 1 in Biology

I'm trying to make a chemical garden, and I was wondering about how many mL of water should be added to 100 mL of sodium silicate. Would 400 mL be acceptable? Any help would be appreciated.

2006-12-22 10:02:17 · 1 answers · asked by Anonymous in Chemistry

wouldn't our bodies feel most comfortable outside at that temperature, or if we were in water that was 98.6. But for most people- 70 is the perfect temp. Why is that?

2006-12-22 10:02:08 · 4 answers · asked by ericar 2 in Other - Science

2006-12-22 09:59:48 · 7 answers · asked by uncleal_666 2 in Geography

2006-12-22 09:58:17 · 3 answers · asked by Chris S 1 in Chemistry