10/02/17

Structure of Ionic Compounds
In case of ionic solids maximum possible coordination number is _________?
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10/02/17

Does the number of shells in an element affect the colour of the flame in a flame test?
Does the number of shells/energy levels in a element affect the colour of the flame emitted? 
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10/02/17

Finding Final Temperature Chemistry
A 41 kg sample of water absorbs 374 kJ of heat. If the water was initially at 25.1 ∘C, what is its final temperature?
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10/02/17

molecular AND net ionic reaction
Give the BALANCED molecular AND net ionic reaction for the reaction of lead(IV) acetate and lithium chromate. Be sure to include phase labels.
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10/02/17

determine the calibration error of a 100 mL graduated cylinder. Water at 25.0 °C was added to the cylinder until the level
(Explain in detail)A student was to determine the calibration error of a 100 mL graduated cylinder. Water at 25.0 °C was added to the cylinder until the level reached 100.0 mL. Knowing the mass of... more
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10/02/17

A 20.0 mL sample of glycerol has a mass of 25.2 grams. What is the mass of a 57-mL sample of glycerol?
A 20.0 mL sample of glycerol has a mass of 25.2 grams. What is the mass of a 57-mL sample of glycerol?     EXPLAIN PLEASE
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10/02/17

A 5dm^3 vessel contains 2gm of hydrogen and 28g of nitrogen at 27C find the total pressure of mixture of gases
A 5dm^3 of Vessel contains 2gm of hydrogen and 28gm of nitrogen find the total pressure of mixture of gases?
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10/02/17

Chemistry help needed badly
1. Carbon tetrachloride (CCL4, MW 153.81, Kb= 5.03 degrees C/m and BP=77.2 degrees C, d= 1.59 g/mL) is an excellent solvent for chlorinated compounds. When 5.00 g of trichloromethane, CHCl3 (MW... more
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10/02/17

where do you think the bacterium that produces HindIII is found?
The optimal working temperature for the restriction endonuclease HindIII is 37°C
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10/01/17

Balance the chemical equations (a)N2+H2=NH3 (b)CL2+KI=KCL+I2
Balance the chemical equations
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10/01/17

Write the balanced net ionic equation for the reaction that takes place between potassium permanganate and hydrogen peroxide in an acidic solution
Write the balanced net ionic equation for the reaction that takes place between potassium permanganate and hydrogen peroxide in an acidic solution
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10/01/17

A bullfrog can leap 6 feet. How far will it go in four leaps?
math problem solve 
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09/30/17

Question from a humble farmer. What is K2O-nSiO2-xH2O?
In need of K2SiO3 for my cucumber plants, I purchased a bag of potassium silicate. The molecular formula is K2O-nSiO2-xH20. Normally, my bags of fertilizer are easy to figure out. For example,... more
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09/30/17

I have a world problem question. Which is substitution i think, i really don't know, that's why I am struggling.
Lyle needs 200g of chocolate that is 86% cocoa for a cake recipe. He has one kind of chocolate that is 99% cocoa and another kind that is 70% cocoa. Determine how much of each kind chocolate is... more
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09/30/17

Mercury is a stream is 0.68ppb by mass. How many grams of mercury are present in 15.0L of the stream of water( assuming the density of water is 0.998g/mL)?
Would you divide 0.68ppb as mass over 0.998g/mL and then times that by 15.0L? 
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09/30/17

determine the molecular wight of 254.g of unknown compound given is 10.2 mole of it
determine the molecular wight of 254.g of unknown compound given is 10.2 mole of it
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09/30/17

my car drives 16.8mi oer gal burned. if the density of gas is 0.720g/cm3, hoe many meters will the car average for every gram og gas burned?
How do i find meters of gas burned for every gram of gas burned. The density portion of equation is confusing me. 
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09/30/17

One grain of sand weighs 7 x 10^-5 grams. How many grains of sand are there in 6300kg of sand
One grain of sand weighs 7 x 10^-5 grams. How many grains of sand are there in 6300kg of sand
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09/30/17

Molar abosrptivity
Calculate the molar absorptivity 1. Blue Dye (concentration 40mg/L) (Peak/ λmax is 630) 2.  Red Dye (concentration 60mg/L) (Peak/ λmax is 520) 2. Red Dye (concentration 70mg/L) (Peak/ λmax is... more
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09/29/17

Rf values TLC - Organic Chemistry LAB
    For my developing solvent, I used 6:4 hexane:ethyl acetate. For my reference spot, I mixed some salicylic acid and ethyl acetate. And for my test spot, I used some impure aspirin and ethyl... more
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09/29/17

What is more polar? Aspirin or Salicylic acid?
What is more polar? Aspirin or Salicylic acid? Please explain, and thank you!
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09/28/17

According to legend, a king requested that the royal scientist, Archimedes, determine if his crown was really made of pure gold.
Archimedes measured the mass of the crown and found it to be 505.43 grams. Using volume displacement, he found the volume to be 44mL. What was the density of the crown? Is the crown made of pure... more
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09/28/17

Which molecule is more polar?
p-methoxystyrene or p-cresol (p-methylphenol)?   I think p-cresol (p-methylphenol) would be more polar because of the OH. Conformation would be greatly appreciated!
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09/28/17

How much energy ( in joules) is released when .002 Kg of ethyl alcohol vapor is condensed to a liquid at the same temperature?
 I am unsure of what formula to use and what numbers to plug into it!!
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Bio

09/28/17

How can you tell the difference from excessive bleeding caused by Vitamin K deficiency and thrombocytopenia?
How can you tell the difference from excessive bleeding caused by Vitamin K deficiency and thrombocytopenia?
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