06/24/18

how many grams of glucose (C12,H22,O11)are needed to prepare 400ml of 5% glucose sulotion
about glucose sulotion
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06/22/18

Osmosis help--- water in a bag and water in beaker (hypertonic,isotonic,hypotonic)??
What will happen to the water in the bag? will the mass stay the same or decrease or increase?   will the same thing happen for  Maltose in a bag and maltose in beaker? 
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06/20/18

Calculate the Ka of a weak acid?
A sample of a certain monoprotic weak acid was dissolved in water and titrated with 16.00mL of 0.125M NaOH to reach the equivalence point. During the titration, the pH after adding 2.00mL of NaOH... more
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06/20/18

Calcium has a charge of +2. The chart lists the charges of different ions. Which are possible equations for an ionic compound with calcium?
i dont understand this its about calcium and has a change of +2 this chart lists the differnts   
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06/20/18

ive been stuck for a week now please help
What volume of a 2.5 M stock solution of acetic acid (HC2H3O2) is required to prepare100.0 milliliters of a 0.50 M acetic acid solution? Use the equation Mconcentrated × Vconcentrated = Mdilute ×... more
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06/20/18

A gas measures 5000. mL at standard pressure. What volume in mL will it have at 800 Torr?
 I need help  
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06/20/18

Caffeine has a molecular weight of 194 .it contains 28.9 percent by mass of Nitrogen .find the number of atoms of Nitrogen in 1 molecule of it
Please help me out
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06/19/18

What Is the Minimum Number of Enzymes Needed To Catalyze 5 Molecules Of Catechol?
Can someone provide me with some guidance on how to answer this question? Thanks!
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06/19/18

Calculate pH
[NH4Br](aq) = 0.020M , pKa of NH4+= 9.24   Given that the question is asking for pH, I know I need to find the [H3O+], so I've set up the reaction to look like this: NH4Br (aq) + H2O ⇌ H3O+ +... more
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06/19/18

Methyl orange indicator in .1 M NH3(aq)
I'm a new york state chemistry student preping for the regents and need help with this regents question. Why is it that when methyl orange indicator is put into a 0.10 M solution of NH3 (aq) it... more
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06/19/18

Aqueous iron(III) chloride and potassium sulfide are mixed
This will be a Net Ionic Equation.
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06/19/18

How to know if this is the best lewis dot structure regarding the exception of octet rule
Some examples seem to have More Suitable lewis structure although they already achieved stable electron arrangement in another structure,how could that be?and how formal charges help to determine... more
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06/18/18

Percent purity
A 0.347 g sample of impure NaHSO3 is dissolved in water and titrated with 0.1481 M NaOH. If 20.20 mL of NaOH is required, what is the percentage purity of the NaHSO3 sample?
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06/18/18

calculate the density of the wood
A bar of brass of mass 180g and density 8.5gm-3 is attached to a piece of wood of mass 70g and both are totally immersed in water. the apparent mass is 120g. Calculate the density of the wood
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06/18/18

A 2.2-kg pile of aluminum (ρ = 2.70 g/cm3) cans is melted, then cooled into a solid cube. What is the volume of the cube? Round answer to two decimal place
I can't remember how to do this. I don't think I am doing this problem right.
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06/17/18

Chemistry HW: What is the energy value of the olive oil in kJ/g?
When a 0.560 g sample of olive oil is burned in a calorimeter, the heat released increases the temperature of 370 g of water from 22.7C to 39.1C. What is the energy value of the olive oil in... more
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06/16/18

Dilution Calculation
0.25 g of calcium nitrate is dissolved in 100 mL water. A 50 mL sample of this solution was diluted to 75 mL. What was the final concentration?
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06/16/18

How many grams of solute should be added in 100 gm of water to get a solution of density 1.2gm/ ml and strength 5% (w/v)?
Concentration  terms
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06/15/18

where does the energy used by green plants come from?
Where does the energy used by green plants come from? Soil, air, sun, earth
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06/14/18

Hydrogen is the second most abundant gas in the atmosphere
It’s in physical science  and it is also an true or false question 
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06/14/18

the factors influencing purity, eg during recrystallisation, filtration and drying of an organic compound.
I need help with this question
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06/14/18

evaluate the accuracy of the measurements made, contrasting them with wet techniques, where eg. (determination of Cu2+ concentration by titration and
by colourimetery
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06/14/18

Calculate the molarity of a sucrose c12h22o11 in more per L if 10g of sucrose is dissolved in water to make a final volume of 500ml
My teacher gave a question to slove I am not understanding 
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06/13/18

How many cm3 of the amine gas did the reaction produce at 25°C and 98000 pascals?
0.63g of methyl amine was produced by the reaction:CH3NH3Cl + NaOH ----> CH3NH2 + NaCl + H20
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06/13/18

How to find the energy and heat released?
1.00mol of propene sample is placed in an oxygen filled calorimeter and burned. The starting temperature of the calorimeter is 25.00°C and its total heat capacity is 97.1kJ/°C. The temperature of... more
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