10/23/17

Can you help me with this thermochemistry problem?
If the internal energy of a thermodynamic system is increased by 300J while 75J of expansion work is done, how much heat was transferred and in which direction, to or from the system?
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10/23/17

How to express yourself without Anxiety?
Hi! I'm a student in Thailand. I want you to suggest how to manage emotion without Anxiety I'm very shy when I'm going to present in front of the class. Please answer
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10/23/17

What will be the value of this concentration expressed in mol∙dm−3?
The concentration of H2SO4 in a certain solution is 1.23×10-2 mol∙cm-3
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10/23/17

how many moles?
For the reaction, calculate how many moles of the product form when 2.15 mol of O2 completely reacts. Assume that there is more than enough of the other reactant. 2H2(g)+O2(g)→2H2O(l) please help?
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10/23/17

how many moles?
For the reaction, calculate how many moles of the product form when 2.73 mol of H2 completely reacts. Assume that there is more than enough of the other reactant. H2(g)+Cl2(g)→2HCl(g) please help?
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10/22/17

presumptive luminol test
  What role does the hydrogen peroxide play in the reaction? A: Is it the the oxidizing agent and blood in the catalyst?   How would you describe to jury about the scientific basis for this test.
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10/22/17

What is the phase change from a gas to a solid
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10/22/17

When aqueous solutions of potassium fluoride and hydrochloric acid are mixed, an aqueous solution of potassium chloride and hydrofluoric acid results
Write the net ionic equation for the reaction.(Use the solubility rules provided in the OWL Preparation Page to determine the solubility of compounds.)Use H+ for the hydronium ion.
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10/22/17

When solid Ni metal is put into an aqueous solution of Pb(NO3)2, solid Pb metal and a solution of Ni(NO3)2 result
. Write the net ionic equation for the reaction
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10/22/17

A typical pH value for rain or snow in the northeastern United States is about 3.9.
Is this basic or acidic? What is the corresponding hydrogen concentration? How does this compare with the hydrogen concentration of pure water? Round your answers to two decimal places when necessary. more
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10/22/17

determine the mole ratio
a chemist reacted measured volumes of a 0.50 M copper nitrate solution with measured volumes of 0.50M sodium carbonate solution. The mass of the precipitate formed was measured and plotted. How do... more
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10/22/17

what enables liquid water to take the shape of its container
what enables liquid water to take the shape of its container 
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10/22/17

When aqueous solutions of calcium nitrate and ammonium carbonate are combined, solid calcium carbonate and a solution of ammonium nitrate are formed?
The net ionic equation for this reaction is:
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10/22/17

Write the net ionic equation for the following molecular equation. NiBr2(aq) + (NH4)2CO3(aq) -> NiCO3 (s) + 2NH4Br(aq)
(Use the lowest possible coefficients. Use the pull-down boxes to specify states such as (aq) or (s). If a box is not needed, leave it blank.)
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10/22/17

a bicyclist travels for 1.5 hours at an average speed of 27 km/hr how far does the Bicycle travel during the time
a bicyclist travels for 1.5 hours at an average speed of 27 km/hr how far does the Bicycle travel during the 
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10/21/17

write a general statement describing the periodic trend in metal activitiy across a group (vertical column) of the periodic table?
write a general statement describing the periodic trend in metal activitiy across a group (vertical column) of the periodic table?
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10/21/17

What volume is occupied by 0.959 mol of CO2 at 236.4 K and 999 mmHg
What volume is occupied by 0.959 mol of CO2 at 236.4 K and 999 mmHg
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10/21/17

Chemistry queation
The normal range of specific gravity for urine is 1.012-1.030 type-2 of diabetes and kidney disease can result in decrease in specific gravity.if a 5ml sample of urine has at total mass... more
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10/21/17

A) How many atoms of carbon are contained in 2.13 ×10−5g of carbon?; B) Deduce the empirical and molecular formula.
A chlorinated hydrocarbon compound was analysed and found to consist of 24.24 % of carbon, 4.04 % of hydrogen and 71.72 % of chlorine. From another experiment the molecular mass of the same... more
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10/21/17

Question concerning molarity, volume and mass, please help!
If 10 drops of 0.5 mol L-1 Na3PO4(aq) had been added to the sample containing excess 0.25 mol L-1 Ca(NO3)2(aq), what mass of precipitate would you expect to produce? You may assume one drop is... more
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10/20/17

In the General reaction A + 2B --> C + 4D ∆H = -2367 kj/mol. What is the ∆H per mol of D?
In the General reaction A + 2B --> C + 4D ∆H = -2367 kj/mol. What is the ∆H per mol of D?
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10/20/17

Can you help me with this problem on total pressure?
A sample of He gas (3.0L) at 5.6atm and 25°C was combined with 4.5 L of Ne gas at 3.6 atm and 25°C at constant temperature in a 9.0 L flask. How do I calculate the total pressure in the flask if... more
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10/20/17

I am struggling with this AP chemistry problem on a chemical reaction between sufuric acid and zinc?
Zinc reacts with aqueous sulfuric acid to form hydrogen gas   Zn(s)+ H2SO4(aq)==> ZnSO4(aq)+H2(g)   In an experiment 201mL of wet H2 is collected over water at 27°C and 26.74 torr. How do I... more
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10/20/17

Can you help me with this rate of effusion problem?
How do I calculate which of these pairs of gases have the most nearly identical rates of effusion?   A. CO and CO2   B. CO and N2   C. NO2 and N2O4   D. N2O and NO2   E. N2 and O2  
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10/20/17

Can you help me with this partial pressures problem?
5.0g of SO2 and 5.0g of CO2 are placed in a 750mL container at 50°C. How do I calculate partial pressure of the SO2?
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