07/07/19

How to determine number of structural isomers?
I have come through many questions in which they ask to give number of possible structural isomers. For example number [structural isomers of... more
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02/05/19

linear function
Find a linear function h, given h(6)=-13 and h(-2)=11. Then find h(9)
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09/22/18

What fraction of this beryllium atom's mass comes from its electrons?
confused on how to find the mass of electrons? 
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08/30/18

Is y=x+1 is a Function or not?
Function or Not?
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05/01/17

Balanced equations??
a student is asked to give the sum of coefficients in the following balanced equation 3 FeO+2Al=Al2O3+ 3Fe. the student answer is i. why is the answer incorrect
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03/19/17

Determine if the salt NH4NO2 is acidic, basic or neutral.
Please help! 
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03/15/17

Distilled water with different synthetic dissolved salt in it.
HelloI have a liquid mixture in a bottle containing different synthetic substances dissolved from their salt forms (i.e. lidocaine hydrochloride, anhydrous caffeine). These compounds are dissolved... more
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03/07/17

what do you get when you add 0.0300 mol H2 and 0.387 mol CH4
what do you get when you add 0.0300 mol H2 and 0.387 mol CH4
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03/07/17

Explaining Charles's law.
7. In a hot-air balloon, the balloonist may have to light the propane torch for a few minutes. Using Charles’s law, explain why he might need to do this.8. As the temperature of a given sample of... more
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03/05/17

If a gas is in a 1 liter bottle, it will fill that bottle. If that same gas is confined to a 10 liter volume, it will fill that volume. Solve for the volume.
If a gas is in a 1 liter bottle, it will fill that bottle. If that same gas is confined to a 10 liter volume, it will fill that volume. Solve for volume.
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02/25/17

Delta Hvap equation
How much energy is required to vaporize 48.7 g of dichloromethane (CH2Cl2) at its boiling point, if its ΔHvap is 31.6 kJ/mol? I just need to know the formula on how to solve this equation
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02/24/17

acids add hydrogen ions to water in a solution?
acids add hydrogen ions to water in a solution?
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02/23/17

Help me with this. My answer is not coming
The values of Ksp of CaCO3 and CaC2O4 are 4.7 × 10–9 and 1.3 × 10–9 respectively at 25°C. If the mixture of these two is washed with water, what is the concentration of Ca2+ ions in water?
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02/23/17

Osmosis related question
The reason for osmosis is :-   (1) The vapour pressure of solvent is less than that of solution (2) The vapour pressure of solution is less than that of solvent (3) Movement of solvent... more
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02/03/17

Calculate the molaLity of 36% by mass HCl.
This is a concentration of solutions problem. I don't know what is supposed to be the kg in the malamute equation. I converted 100 g to kg  because I was assuming it was 100 g ?
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01/26/17

what will be the emf of the cell
What will be e.m.f of the cell 2 Ag+ + Cu gives Cu+2 + 2Ag   Given: Eo Ag/Ag+ = -0.8v   Eo Cu+2/Cu = 0.3v   Options: a)-0.6V b)0.5V c)-1.1V d) 1.1V
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01/17/17

A substance has a density of 2kg/L. 4kg of this substance is then placed in 10 liters of water. What is the volume percent of this in 10 mL water.
A substance has a density of 2kg/L. 4kg of this substance is then placed in 10 liters of water. What is the volume percent of this in 10 mL water?
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01/16/17

Ionisation energy doubt
Ionisation energy of Cl- is 349KJ/mole. Approximate heat liberated when an electron is added to gaseous atom a)5x10-20J b)5.9x10-19J c)6.5x10-20J d)3.49x10-26J
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01/16/17

consider the following elements BR I and cl which is the most reactive nonmetal
hi I'm study for a midterm and i have a bunch of questions which are left blank and i can't find the answer online if you can can thank you so much   consider the following elements BR I and cl... more
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12/05/16

Why do chemists use superscripts? Give an example.
Explain please
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11/10/16

Chemistry Help! Need help with atleast one.
Consider the reaction K2S(aq) + Co(NO3)2(aq) --> 2KNO3(aq) + CoS(s)What mass of CoS is produced from 175 mL of 0.115 M Co(NO3)2? _____... more
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10/24/16

there is 6.10g of Cobalt (II) Nitrate, Co(NO3)2, what is the molar mass?
there is 6.10g of Cobalt (II) Nitrate, Co(NO3)2, what is the molar mass?  
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10/22/16

Select all species that are included in a NET ionic equation.
Product solids Spectator ions Reactant solids Reactant ions Product ions     I know that spectator ions are not included. However, when I select product solids, reactant solids, reactant... more
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10/19/16

Solutions...?
What would you expect to see in a beaker containing a solution of the weak electrolyte acetic acid (CH3COOH), and in a separate beaker containing a solution of the strong electrolyte Potassium... more
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09/22/16

How would I assign oxidation numbers to these?
Fe2 (SO4)3   (NH4)2 C2O4
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