06/13/18

Using mole ratio to determine concentration of a reactant?
S2O82- + 2 I- --> 2 SO42- + I2   (reaction 1)       [I-]=0.20M, [S2O82-]=0.10M      2 S2O32- + I2 --> S4O62- + 2 I-  (reaction 2)      [S2O32-]= 0.0050M   I need to determine the... more
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06/13/18

One number is 7 more then another number.The sum of these two munchers is 101.What are the numbers?
Please help :)
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06/13/18

Mass of an apple is 160?
answer has to be grams or kilograms 
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06/12/18

how to calculate the mass of ethanoic acid formed when jared's 18.0 grams of aspirin is hydrolized. molar mass of ethanoic acid =60.0 grams mol-1
I will like to get the best suitable answer for this question please thank you.
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06/12/18

Using NOBLE GAS notation write the electron configuration for the lithium atom.
Write the complete electron configuration for the magnesium atom.   Using NOBLE GAS notation write the electron configuration for the lithium atom.     I am stuck on this problem and I do not... more
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06/12/18

is dibromomethane used in the pharma industry?
is dibromomethane used directly or indirectly in the pharma industries? If yes then please give an example
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06/11/18

Solid state. Please answer briefly
An ionic compound is made up of A cations and B anions. If A cations are presentat the alternate corners and B anion is present on the body of the diagonal, what isthe formula of the ionic compound?
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06/11/18

Write the complete electron configuration for the chlorine atom.
Write the complete electron configuration for the chlorine atom.   Using NOBLE GAS notation write the electron configuration for the nitrogen atom.
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06/11/18

what is the standard enthalpy change for the reaction
Given the standard enthalpy changes for the following two reactions:(1) 2Ni(s) + O2(g)2NiO(s)...... ΔH° = -479.4 kJ(2) Ni(s) + Cl2(g)NiCl2(s)......ΔH° = -305.3 kJwhat is the standard enthalpy... more
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06/11/18

the standard enthalpy of formation of ICl(g) is
A scientist measures the standard enthalpy change for the following reaction to be -25.6 kJ :I2(g) + Cl2(g)2ICl(g)Based on this value and the standard enthalpies of formation for the other... more
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06/11/18

Using standard heats of formation, calculate the standard enthalpy change for the following reaction.
Using standard heats of formation, calculate the standard enthalpy change for the following reaction. Fe(s) + 2HCl(aq)FeCl2(s) + H2(g)
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06/10/18

Impulse in nerve fibers travel 372 kilometers in 3 hours. What is the rate in kilometers per hour?
Impulses in nerve fiber travel 372 kilometers in 3 hours. What is the rate, or speed, in km per hour
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06/10/18

The percentage by volume of C3H8 in a mixture of C3H8,CH4 and CO is 36.5. Calculate the volume of CO2 produced when 100mL of mixture is burnt in excess of O2
This question is from mole concept and stoicometry  Please give me the full key.  
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06/10/18

Which of the following statement is not true?
Which of the following statement is not true? (a) When a solid changes to a gas it is always a chemical change. (b) Water can evaporate at any temperature. (c) Condense is the opposite to... more
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06/09/18

stock solution 25 mg/ml Hannah needs 250 micrograms/45ml .... how much does she need to take out from the stock to make up the new solution.
chemistry making up solutions from stock
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06/09/18

How to calculate mass in grams of Avogadro's number of Cu atoms
I have calculated 63.54/6.02 x 10^-23 and get the answer 10.55 x 10^-23, not sure if this is correct? 
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06/07/18

how many grams of methane are in a 2-L tank of methane at STP?
This Is a practice problem for school 
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06/07/18

What is the concentration of each gas once equilibrium is reached?
Can someone please let me know if I did this right?    1.800 mole of N2O4(g) is injected into a closed 1.00L container. Kc=4.66 x 10-3 at 298K   N2O4 (g) ⇌ 2NO2 (g)   what is the... more
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06/07/18

What is the amount concentration of cobalt II sulfate in a solution where 100.0mL is reacted with excess of a sodium carbonate solution
What is the amount concentration of cobalt II sulfate in a solution where 100.0mL is reacted with excess of a sodium carbonate solution and the following evidence is collected. Mass of filter paper... more
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06/07/18

the table suger that people add to their coffee or use in baking is called fiber?
trrue or false
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06/07/18

Carbohydrates, Lipids, proteins and nucleic acids → Freezing Point
are those an example of freezing point 
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06/06/18

how many grams of ammonia formed during the reaction with 100g of hydrogen and 100g of nitrogen?
n2+3h2 -> 2nh3 .. so confused? 
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06/06/18

Use the periodic table of the elements to determine the percent ionic character of the bond in each of the following compounds
1) LiCl2) NO23) HCl4) AlBr35) BeO
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06/06/18

Definition of Onomatopoeia, Alliteration, and Assonance?
The Definitions of Onomatopoeia, Alliteration, and Assonance                                 
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06/05/18

you need 25g of glucose. you are given a 5% (w/v glucose solution. ho many mL of the 5% glucose solution do you need to obtain 25g of glucose?
I'm not sure which formula to use for this problem: (concentration 1)(volume 1)=(concentration 2)(volume 2) or%(weight/volume)=(#grams of solute/ #milimeters total volume of solution)*100
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