10/20/17

Can you help me with this sodium hydride reaction problem?
Sodium hydride reacts with excess water to produce aqueous sodium hydroxide and hydrogen gas   NaH(s)+ H2O (l)=>NaOH(aq)+H2(g)   How do I calculate what mass will produce 982mL of gas at... more
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10/20/17

How do I calculate the pressure in a 12.2L vessel that contains 2.34g CO2, 1.73g SO2, and 3.33g Ar at 42 degrees Celsius?
Can you please help me with this problem? Thanks
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10/20/17

I am struggling with this AP Chemistry word problem
A 255mL round-bottom flask is weighed and found to have a mass of 114.85g. A few mL of an easily vaporized liquid are added to the flask and the flask is immersed in a boiling water bath. All of... more
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10/20/17

What volume of CO can be produced from the complete decomposition of 444g of Ni(CO)4?
The reaction is: Ni(CO)4= Ni(s)+ 4CO(g)
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10/20/17

The price of a cup of coffee has risen to $2.45 today. Yesterday's price was $2.10 . Find the percentage increase.
round to the nearest tenth
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10/20/17

word problem
You need a 35% alcohol solution. On hand, you have a 175 mL of a 85% alcohol mixture. How much pure water will you need to add to obtain the desired solution?You will need ______mL of pure water to... more
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10/19/17

Word Problem
You need a 55% alcohol solution. On hand, you have a 275 mL of a 40% alcohol mixture. You also have 80% alcohol mixture. How much of the 80% mixture will you need to add to obtain the desired... more
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10/19/17

Can you help me with this AP Chemistry Stoichiometry problem?
What volume of sulfur dioxide can be produced by the complete reaction of 3.82g of calcium sulfite with excess HCl (aq) wheb the final SO2 pressure is 8.27 torr at 44°C
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10/19/17

Which 1.0 M aqueous solution would produce the most ions?
Which 1.0 M aqueous solution would produce the most ions?     A. HF   B. Li2CO3   C. Al(NO3)3   D. KOH      
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10/19/17

I am struggling with this problem on molarity
33.0 mL of aqueous 0.878M potassium oxide solution is mixed with a 25.0mL solution of 0.699M iron( III) nitrate, producing a precipitate.   How do I:   A. Write a balanced net equation for the... more
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10/19/17

Can you help me with this problem about salts?
Consider five unlabled bottles of the following salts: AgCl, BaCl2, NaCl, CoCl2, and HCl. Identify the compound that can be distinguished by adding 1.0 M Na2SO4 to each of the samples. Please... more
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10/19/17

Can you help me with this AP Chemistry problem on reactions and cations? Thanks.
An unknown solution is tested as follows: NaCl is added and no precipitate is formed K2SO4 is added and no precipitate is formed.   Which of these cations might be present in the solution:   A.... more
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10/19/17

Calculate the grams of solute needed to prepare.
A. 2.00 L of a 1.50 M NaOH   B. 4.00 L of a 0.200 M KCL   C. 25.0 mL of a 6.00 M HCI
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10/19/17

Carry out significant test to determine where the 6 measurements provide reliable evidence that the true concentration of the solution is actually not 5 mg/dL.
A reference solution used as a lab reagent is purported to have a concentration of 5 mg/dL. 6 samples are taken from this solution and following concentration are as recorded: {5.32, 4.88, 5.10,... more
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10/19/17

Can you please help me identify this unknown soloution?
An unknown solution is tested as follows:   NaCl is added and no precipitate is formed   K2SO4 is added and no precipitate is formed.   Identify the unknown substance.
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10/19/17

In which compound does nitrogen have an oxidation number of +3?
A. NH3 B. NO3 C. NO2 D. N2O5
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10/19/17

the definition of chromosome
i need the definition and the internet is not finding it for me 
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10/19/17

Chemical Reaction and Precipitate Problem
Which substance, Na2S, NaOH, K2SO4, or KI (all 1.0M) will form a black precipitate when allowed to react with 1.0M aqueous Pb (NO3) 2?
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10/19/17

A shell weighs 1.216g and 10cm3 of 5 mol dm-3 of HCl is added.after shell dissolved, solution is transferred and volume made up to 25cm3.
The solution required 28 cm3 of 1 mol dm-3 sodium hydroxide for complete neutralisation. I have calculated moles of moles of NaOH. I am having trouble working out how many moles of acid remained... more
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10/19/17

i really need help with this
An ice cream shop owner hires a clerk and informs him that the mean weight of scoops of ice cream should be 50 grams. The clerk weighs out seven ice cream scoops with the following weights in... more
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10/19/17

when 0.001 mole of a chloride was added to water the solution required 40cm3 of 0.05M silver nitrate (AgNO3) for complete reaction. the original chloride is?
These are the possible answers: A) NaCl B)SOCl2 C)PCl3 D)SnCl4
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10/19/17

A 50cm3 sample of solution which is 0.1M in HF is treated with 20cm3 of 0.1M NaOH. the concentration of HF remaining in the solution after addition of NaOH
Help please
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10/19/17

Calculate its final volume.
An ideal gas has an initial volume of 2.0 L. If its temperature increases from 2 ℃ to 4 ℃ while its pressure remaining constant.
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10/19/17

If we want to produce 12.75 g of water, how many grams of diborane would we start with?
Diborane, B2H6, was once considered for use as rocket fuel. The combustion reaction for diborane is: B2H6(𝑔)+3O2(𝑔) ⟶ 2HBO2(𝑔)+2H2O (𝑙)
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10/18/17

How much heat is required to raise the temperature of 1 kg of ice at -30° C to steam that is 110° C?
How much heat is required to raise the temperature of 1 kg of ice at -30° C to steam that is 110° C?
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