10/12/17

tablets com in 0.25g and you must administer 1000mg. how many tablets do you give
need work shown please
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10/12/17

volume of PCR , is this right?
Reagent stock concentration             Required final concentration                Volume10X Buffer                                                       1X                                       5... more
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10/11/17

is it possible to make Metal Complexes with alkaloids
I want to know is it possible to make metal complexes with alkaloids present in the plant materials. 
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10/11/17

what is a single or double displacement reaction that sodium fluoride takes place in
sodium fluoride should be the should be part of the two compounds mixed rather than the product of the reaction
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10/11/17

Compare the reactions of CuCI2 and HCI with AgNO3.
 Compare the reactions of CuCI2 and HCI with AgNO3. Propose a hypothesis to account for the reaction product. Hint: What is the likely chemical formula for the product?
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10/11/17

Can you help me with this problem on group 2A metal reaction
The oxides of the Group 2A metals (symbolized by M) react with carbon dioxide in the following reaction   MO(s)+CO2(g) = MCO3   A 2.85 g sample containing only MgO and CuO is placed in a 3.00L... more
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10/11/17

Can you help me with the chemistry problem on gases and fuels?
A fuel composed of (CH3)2N2H2 is mixed with N2O4. The two components react according to the following reaction   (CH3)2N2H2+2N2O4=3N2+4H2O+2CO2(all gases).   If 150g of (CH3)2N2H2 reacts with... more
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10/11/17

3 container 2L all look the same. I have to design experiment to determine which is full half full and which is empty.
IQWST INTRO TO CHEMISTRY
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10/11/17

Can you help me with this AP Chem gas mixture volume problem? THANKS
Equal moles of sulfur dioxide gas and oxygen gas are mixed in a flexible reaction vessel and sparked to initiate the formation of sulfur trioxide. Assuming the reaction goes to completion, what is... more
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10/11/17

How can this lab illustrate this fact
person is slightly denser than water. Life preservers are made of low density materials.  The average density of a person plus a life preserver is less than density of water- so together they will... more
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10/11/17

what process must be performed during clean up; filtration, distillation or chromatography? Why?
What process must be performed during clean up: filtration, distillation or chromatography? Why?
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10/11/17

what is the percent by volume of isopropanol in a 90 mL solution that contains 25 mL isopropanol?
Cant understand the question given by the teacher
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10/11/17

Please help asap
Measuring the amount of carbon-14 enables an archaeologist to determine the age of artifacts and fossils. In 1962, skeletal and fossil remains of a woman were found. The fossil was estimated to be... more
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10/11/17

Can you please give the answer with an algebraic solution? Thank you.
A solution that is 10% antifreeze is mixed with a that is 20% antifreeze to produce 50L of solution that is 15.6% antifreeze. How many liters at the 10% solution are used?
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10/10/17

WHY IN A CLOSED CONTAINER AFTER SOME TIME VAPOUR STARTS CONVERTING INTO LIQUID ?
DWEVEDFVEVWFWFC
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10/10/17

how do the tests on known solutions containing cations and anions make it possible for you to identify the cations or anions in an unknown solution?
 This is my chemistry homework question that I am stuck on, please help!
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10/10/17

how many liters are in 9.6 moles of H2?
it is chemistry class work that based on liters and moles
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10/10/17

Use Dimensional Analysis to solve the following problems. a.) How many seconds old are you? (Express with 2 sig figs in scientific notation.)
I am 13 years old and my birthday is July 28,2004
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10/10/17

Mass of NaOH needed to make 250mL of 0.1M NaOH solution?
Need help. 
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10/10/17

The difference of a number times 7 and 5 is 9
translate the sentence into an equation 
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10/10/17

how would you figure out the number of protons and nutrons in an atom?
 I don't know any thing about atoms I'm trying to find this out there are more questions that I have but ill go one at a time .
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10/10/17

The partial pressure of CH4 is 0.175 atm
A. If the partial pressure of oxygen is 0.250 atm, what is the mole fraction of each gas in the mixture?   B. If the mixture occupies a volume of 10.5L at 65°C how many moles of gas are in the... more
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10/10/17

Can you help me with this AP Chemistry gas laws problem?
Consider two flasks, the first flask has 2.00L of hydrogen at a pressure of 475 torr, the second has 1.00 L of nitrogen at a pressure of 0.200 atm. If the stopcock between the two flasks is opened... more
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10/10/17

Write ionic equations for following reactions:
1. Iron(III) ions and hydroxide ions form Iron(III)hydroxide  2. Silver(I) ions and bromide ions form silver(I)bromide   I am so confused how to do this! 
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10/09/17

Chemistry Help!
There are 2 main isotopes of uranium. The first has an atomic mass of 235.1 amu, and the second has an atomic mass of 238.3 amu. The abundance of the first is 1.720 % and the abundance of the... more
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