01/21/18

density and specific gravity
The density of a 4.0 cubic centimeter sample of a metal is 11.3 grams/cubic centimeter. What is the specific gravity of an 8.0 cubic centimeter sample of the same metal?
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01/20/18

In a landfill, will aluminum or steel degrade faster, and why?
Environmental Chemistry question
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01/18/18

calorimeter problem. to add or not to add
Calcium chloride, CaCl2 is added to canned vegetables to maintain the vegetables' firmness. When added to water it dissolves: A calorimeter contains 2.5 mol ofwater at 26.51 degrees celsius. When... more
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01/16/18

Lead (II) chloride
write balance reactions (showing states) for the dissociation of the following solidsL 1: Lead (II) chloride  
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01/16/18

The average body temperature in humans is 37 +/-0.4 degrees Celsius. The__________ two words) is 0.4.
What are the two words?
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01/14/18

How do I solve this problem on methyl salicylate and methyl 4-hydroxybenzoate?
Methyl salicylae has a melting point of -8°C.   methyl 4-hydroxybenzoate, another molecule with the exact  same molecular formulabhas a melting point of 127°C.   Why is there such a large... more
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01/14/18

Amar Baked a Cake. John ate 1/6. Susan ate 1/5. Chan ate 1/4. Cindy ate 1/3. Luigi ate 1/2. How much of the original cake is left?
the next person eats whats left after the person before them eat their fraction
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01/14/18

choose the correct sequence of events along an axon
nerve impulses
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01/14/18

will aluminium sulphate react with hydrochloric acid
I want to convert aluminium sulpahte to aluminium chloride. A double displacement with barium chloride works, however I wanted to know if the conversion can be obtained by reacting with... more
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01/14/18

Two isomers (A and B) of a given compound dimerize as follows?
Both processes are known to be second-order in reactant, and k1 is known to be .270 L/mol(s) at 25 C. In a particular experiment, A and B were placed into separate containers at 25 C,where [A]o =... more
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01/13/18

What can portable routers be used to cut?
A.Dados B.mortises C.dovetail joints D. All of the above  
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01/13/18

Can you help me with this problem on diethyl ether?
Diethyl ether was one of the first chemicals used as an anesthetic. At 34.6°C, diethyl ether has a vapor pressure of 760 torr, and at 17.9°C, it has a vapor pressure of 400 torr. What is the heat... more
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01/13/18

What is the strongest metallic element? (please help need to know by Monday ASAP)
Please help need to know by Monday ASAP
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01/13/18

A slice of cheese has a mass of 37 g and a volume of 21 cm3. What is the density of the cheese in units of g/cm3 and g/mL?
it is talking about chemitry units, such as mass, volume, and density, i dont understand the question and i dont know what the steps are.
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01/12/18

AP Chemistry Oxidation-Reduction Reaction Titration
Write the balanced net ionic equation for the reaction between MnO4ions and H2C2O4 in acid solution .2 . H ow many moles of Fe2 + ions can be ox i d i zed by 0.043 moles of MnO4 i o n s ?3 . 1.630... more
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01/11/18

How do I solve this Chemistry problem on Phase Changes?
The molar heat of fusion of sodium metal is 2.60 kJ/lol, but it's heat of vaporization is 97.0 kJ/lol   A. Why is its heat of vaporization so much larger than the heat of fusion?   B. What... more
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01/11/18

Gas laws question
A 7.50 g sample of lithium metal is dropped into 25.0 mL of 1.5 M hydrochloric acid. What volume of hydrogen gas would be evolved once the limiting reactant has been consumed? (The reaction is... more
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01/11/18

How do I calculate the normal boiling point of CCl4?
CCl4 has a vapor pressure of 213 torr at 40°C and 836 torr at 80°C. What is the normal boiling point  CCl4?
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01/11/18

How do I calculate the boiling point of water at a specific atmospheric pressure?
In Breckenridge, Colorado, the typical atmospheric pressure is 520 tore. What is  the boiling point of water in Breckenridge? Delta H (vaporization)= 40.7 kJ/mol.
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01/11/18

The proliferation of cyanobacteria was a major contributing factor to the appearance of advanced organisms. Identify the gas released by the cyanobacteria that
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01/11/18

Can I reuse PAA (peracetic acid) once its been in contact with a protein?
Even though the protein is disrupted or washed, can the same PAA left over be used again? Will it have the same reactivity properties or will it be consumed by the protein?
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01/11/18

what distinguishes proteins from other macromolecule types?
 I want to know why proteins are so different from other macromolecules
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01/11/18

The ions of which element will not oxidize cobalt?
a. Sn b. Cr c. Cu d. Hg e. none of the above
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01/11/18

H2SO4 to SO3 in the desert
If we have a H2SO4 barrel in the desert, how is it possible to find SO3 on the sand near it. knowing that there is no way for the H2SO4 to reach its boiling point which is 340°C. is there any... more
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01/10/18

What is the empirical formula of the unknown compound?
A 0.464g sample of a compound containing the elements carbon, hydrogen, oxygen and sulphur was burned completely, yielding 0.969g CO2 and 0.198g H2O. In a separate experiment, all the sulphur in... more
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