03/06/18

if 2.10g of iron and 3.05g of oxygen gas are mixed, how many grams of iron (3) oxide will be produced?
I honestly have no clue where to start and I need a lot of help.
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03/05/18

Calculate the percent dissociation of the acid in each of the following solutions?
A. 0.50M acetic acid  B. 0.050M acetic acid  C. 0.050M acetic acid    D. Use Le Chatlier's principle to explain why percent dissociation increases as the concentration of a weak acid... more
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03/05/18

What are the differences between active transport and passive transport.You must discuss all types of both forms of transport
Must tell all about passive and active transport
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03/05/18

Electron Configuration of Cr0
What does the superscript 0 mean?   The question asks for the electron configuration of Cr0 I know if its plus or minus you subtract or add electrons based on that number but what do you do when... more
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03/05/18

How do I use the ideal gas relationship to determine the experimental volume of CO2 at STP?
Average volume of CO2 in the experiment was 37.68mL. water temp 20.08 C vapour pressure of water 17.7 mmHg Barometric pressure 758.3mmHg   P1V1/T1  = P2V2/T2   I know I have to rearrange the... more
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03/05/18

If 20.0g of N2 has is reacted with excess H2 gas, how many moles of NH3 (g) should be produced?
Not sure how to do it. Ammonia gas is made by N2 + 3 H2 = 2 NH3
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03/05/18

A numerical on states of matter
At 27 degree centigrade a cylinder of 20 litres capacity contains three gases HE O2 N2 their masses are 0.502g 0.250g 1g respectively if all these gases behave ideally calculate partial pressures... more
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03/05/18

Why does the pH change stop after diluting repeatedly diluting hydrochloric acid with water?
Hydrochloric acid was repeatedly diluted with water until the pH stopped changing.
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03/05/18

. If 1 cm3 of iron has a mass of 7.52 g, what is the mass of an iron bar of rectangular cross section with the dimensions shown?
height=3.2cm breadth=1.7cm width=120cm   plz show working
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03/04/18

having problem with absorbance value crystal violet dye's solution
I'm getting problem in absorbance value of crystal violet dye of10,15,20,25 ppm as its reaching above 2.I have repeated this several times but problem is still there.So,kindly guide me about this.i b
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03/04/18

math anmania
Alex is installing wooden flooring in his room. The room is rectangular in shape with length of 12 feet and width of 10 feet.If the total cost of the wooden flooring is $600, what is the unit price... more
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03/04/18

Mixture problem
a chemist has 30g of a 10% salt solution. He wants to increase the salt content to 20% . How much water does he need to evaporate?
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03/04/18

Partial pressure of moist gas and dry gas
Which gas exert high pressure moist gas or dry gas if any one of them then please explain how?
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03/04/18

what is the volume, in millilitres, of water in the container
450ml, 70cl, 0.75l, 2l are poured in a 6 litre container
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03/04/18

The volume of a living cell is 4.2 x 10^-12. What is the volume of 2.7x10^9 such cells?
Write your answer in scientific notation.
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03/04/18

Aldehydes form silver mirror with tollen reagent is true or false
Is this question true or false?
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03/03/18

the number of moles of O2 that will generate 1.3 moles of H2O, C8H8 + 5O2 = 3CO2 + 4H2O
 find the number of moles
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03/02/18

In an experiment, 2.79*10^24 molecule of dry ice (CO2) were converted to gaseous CO2 at STP. What was the volume of the CO2 gas at STP?
Help 
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03/02/18

A storage tank with a volume of 500.0 L contains how many moles of helium at STP? What is the mass of helium?
 Help
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03/02/18

Precipitation reaction
Calculate the ksp value and the mass of precipitated Agcl when 10 mL of 0.01 Μ AgNO3 and 10 mL of 0.0001 Μ NaCl solutions are mixed?Please explain step by step
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03/01/18

You wish to prepare 0.12M nitric acid from a stock solution of nitric acid that is 15.8M.
How many millilitres of the stock solution do you need to make 750mL of 0.12M nitric acid. 
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02/28/18

Titration problem
25.0 mL of phosphoric acid (H3PO4) solution with an unknown concentration is titrated with a 0.100M solution of NaOH. It takes 35.42 mL of the NaOH to reach the end-point. What was the... more
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02/28/18

HNO3+Ca(OH)2= Ca(NO3)2+H2O
 I would like it answered and explained (step by step explaining) it’s a grade 7 too 9 question at GCSEs however I’m only in year 9 I would just like to know if I have done it right 
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02/28/18

What is the identity of a sample that has a volume of 3.62 cm3 and a mass of 28.5 g?
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02/28/18

In a reaction vessel 0.600 mole of Ba(NO3)2(aq) and 0.300 molly of H3 PO4(aq) are combined with dionized water to a final volume of 2.00L.
3Ba(NO3)2 +2H3PO4=Ba3(PO4)2+6HNO3 1.Calculate the mass of Ba3(PO4)2 formed.  2. What is the concentration in Molarity of NO3(aq). After the reaction reaches completion .?   
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