06/05/18

What is a valency?
Please tell me about what exactly valency is with a few examples.
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06/03/18

what is the name of the mechanism by which plasmid is replicated
Microbial Genetics.
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06/03/18

what is a polymer and a monomer
it is from organic chemistry  
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05/31/18

If osmotic pressure of 1M aqueous solution of H2SO4 at 500K is 90.2.calculate Ka2 for acid whereas Ka1is infinite
This is from solution chapter relating ionic equilibrium 
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05/31/18

I can’t inderstand a Chemistry experiment. There is a half cell with Copper sulfate pentahydrate and two electrodes of copper and zinc. How can voltage pass?
We did the experiment without a battery and we checked the voltage connecting the two electrodes with a voltmeter and worked. I can’t figure out how can it work without a battery supply because it... more
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05/31/18

if i used 497 gallons of water but my meter was showing a 81% accuracy, how much did I really use? And how do you get that answer?
I want to be able to calculate how much more in volume an answer would be if I have a percentage below 100% accuracy.
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05/31/18

A boy drinks 500ml of 9% w/v glucose solution. Number of glucose molecules he has consumed
No of glucose molecules he has consumed
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05/30/18

Hess's Law Problem
3. Calculate the enthalpy of combustion for propane, C3H8, if:ΔHof for propane = -104 KJ/moleΔHof for liquid water = -286 KJ/moleΔHof for gaseous carbon dioxide = -393.5 KJ/moleSolve for the... more
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05/30/18

Is the reaction rate dependent on the concentration of the excess reagent?
If a higher concentration means a higher rate of reaction because of more collisions, then does the reaction rate depend on the concentration of the excess reagent? 
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05/30/18

Convert 2.3 atm into mmHg
How do I convert atm to mmHg?
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05/30/18

how many grams of Ag will be produced from 5.00g of Cu and 1.00g of AgNO3
Cu+2AgNO3→2Ag+Cu(NO3)2
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05/29/18

How many liters of oxygen gas at STP are needed to combust 12.0 g of propane according to the reaction C3H8 + O2 ---> CO2 + H2O
I need help with this question and I have no idea where to start
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05/29/18

Metallic bonding between sodium atoms is more preferrable or ionic bonding
If two sodium atoms are there with chlorine atoms then what would happen metallic bonding of two sodium atoms or ionic bonding between chlorine and sodium
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05/28/18

Mark is older than Yolanda. The sum of their ages is 35. The difference between their ages is 15. How old is Mark and how old is Yolanda?
 This is a system of equations word problem, and it's super hard, so.. help? >w<
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05/28/18

12.78g of organic compound containing c,h,o undergoes combustion to form 25.56g co2 and 10.46g of water.find the emperical formula of the compoun
Empirical formula needs to be calculated that 
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05/26/18

Determine the empirical formula for a compound that is 32.4g carbon, 6.81g hydrogen and 10.79g oxygen.
i need to know how to write the empirical formula
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05/26/18

Is it true that when sulfur and nitrogen oxides mix with rainwater, weak acids are formed?
I am studying acid rain for school right now.
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05/26/18

Do scientists think that acid rain forms when carbonates of sulfur and nitrogen mix with rainwater?
I am studying acid rain right now.
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05/26/18

is it true that any form of precipitation with a pH higher than 5.6 is called acid rain
 I am working on an acid rain project right now and I was just wondering about this.
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05/25/18

How many liters of carbon dioxide (CO2 - 44 g/mol) will have formed at the end of this reaction (at STP)?
C2H5OH + 3O2 = 2 CO2 + 3 H2O 
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05/25/18

Calculate the total gas pressure after one half-life?
Decomposition of N2O to N2 and O2 is a first order reaction. At 730 deg. C the half life of the reaction is 3.58 x 103 min. If the initial pressure of N2O is 2.10 atm at 730 deg. C,    a.... more
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05/25/18

A persons gender and size can play a major role in the effects of alcohol
Healt 
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05/25/18

Square brackets around CO2
This is probably a silly question, but there is a text about photosynthesis which talks about carbon dioxide all the time, but only in one opportunity does CO2 appear inside square brackets. Does... more
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05/24/18

Please andwer
forty liters of a 60% disinfectant solution are to be mixed with a 20% solutionto dilute it to a20% solution. How much of the 10% solution must be used
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05/24/18

If there is 1.55 litres of jellybeans in the jar, 10 jelly beans are replaced with 18mls of water, how many jelly beans are in the jar
Is there is a jar of jelly beans, and 10 of the jelly beans get replaced with 18mls of water, how many jelly beans are in the jar?
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