06/11/20

A student dissolves...
A student dissolves 12.3 g of lithium chloride (LiCl) in 250. g of water in a well-insulated open cup. She then observes the temperature of the water rise from 22.0 °C to 30.3°C over the course... more
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06/10/20

Work out the concentration of the sulfuric acid in grams per dm3 if it took 25cm3 of it to completely neutralise the sodium hydroxide. The relative molecular mass of sulfuric acid is 98
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06/10/20

What type of substance is phenolphthalein
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06/10/20

Can I get some help finding the molarity of HCl based on the data I gathered? When it reads 25.00/.03, I was using a volumetric flask with a differentiation of +/- 0.03mL
Trial 1 Trial 2 Trial 3Initial buret reading 0.31 0.40 18.76final buret reading 28.43 28.59 46.71Vol. of NaOH used ... more
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06/09/20

After 71.0 min, 35.0% of a compound has decomposed. What is the half‑life of this reaction assuming first‑order kinetics?
Please help me with this question!Thank you!
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06/09/20

Magnesium burns in air to give magnesium oxide as shown below. If 8g of magnesium oxide product is produced, calculate how much magnesium metal must have been used.

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06/09/20

Calculate the empirical formulas of the following polymer: Saran; 30.1% C, 3.2% H, 66.7% Cl
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06/09/20

Calculating Mass
Milk of magnesia has 400 mg of  Mg (OH)_2 per teaspoon. Calculate the mass of stomach acid that can be neutralized by 1.70 teaspoon of milk of magnesia, assuming that the stomach acid is 0.50% HCI... more
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06/08/20

Milk of magnesia has 400 mg of Mg (OH) 2 per teaspoon.
Calculate the mass of stomach acid that can be neutralized by 3.90 teaspoon of milk of magnesia, assuming that the stomach acid is 0.50%  by mass.
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06/08/20

6 need help please

How many grams of Kr are in a 1.55 L cylinder at 52.8 ∘C and 9.07 atm?
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06/08/20

Choose the correct answer
What is the PH of 0.15 M solution of the week acid ammonium bromide?kb= 1.8*10^-5 for ammoniaa)11.22b)8.96c)2.78d)5.04
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06/08/20

Choose the correct answer
A solution with a PH of 9.50 has a POH ofA)23.50b)4.50c)9.50d)0.50
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06/08/20

Choose the correct answer

A solution in which [OH^-] = 1.20*10^-7 M has a PH ofa)6.92b)7.08c)5.35d)8.75
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06/08/20

Choose the correct answer
A chemist mixes 0.00040 mol/l solution of Ca(OH)2, where kb=5.0*10^-11. The PH of this solution isa)between 6 and 9b)between 3 and 6c)between 12 and 14d)between 9 and 12
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06/08/20

Choose the correct answer
A chemist mixes 0.20 mol/l solution of a weak base where kb=3.82*10^-10. The PH of this solution isa)between 9 and 12b)Between 5 and 7c)between 7 and 9d)between 12 and 14
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06/08/20

Choose the correct answer
When [H^+]=4.0*10^-9 M in water, the a) ph=9.40b)ph=8.40c)ph=-9.40d)ph=7.00
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06/07/20

y = x + 7 & y = 8x + 21
Solve the system of equations
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06/07/20

Which of the following errors could cause your percent yield to be falsely high, or even over 100%?
Heating the sample too vigorously. Handling the crucible directly with your hands. Failing to completely decompose the sodium bicarbonate sample. Taking the mass of the empty crucible without the... more
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06/07/20

A 3 mole sample of gas at 25 degrees C and 1 atm, leaks. When the leak is discovered and sealed the pressure in the vessel has dropped to 0.694 atm. How many moles of gas remain in the vessel?
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06/06/20

Help......me.....
For each of the reactions at constant pressure, determine whether the system does work on the surroundings, the surroundings does work on the system, or essentially no work is performed.Work done... more
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06/06/20

Chemistry help......

A 100.8 g sample of a substance is initially at 22.0 °C . After absorbing 379 cal of heat, the temperature of the substance increases to 61.8 °C . What is the specific heat (𝑆𝐻) of the substance?
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06/06/20

Chemistry help.....

A solution is made by mixing  238.0 mL of ethanol initially at 11.2 ∘C with 238.0 mL of water initially at 24.2 ∘C. What is the final temperature of the solution assuming that no heat is lost? The... more
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06/06/20

Chemistry help.....

What concentration of NO3_ results 871 mL of 0.769 M NaNO3 is mixed with 919 mL of 0.505 M Can(NO3)2
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06/05/20

How many grams of H2O(l) would be made to react if 58.9 kJ of energy were provided?
The following thermochemical equation is for the reaction of water(l) to form hydrogen(g) and oxygen(g). 2H2O(l)2H2(g) + O2(g)    H = 572 kJ How many grams of H2O(l) would be made to react if 58.9... more
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06/05/20

What is the maximum mass of S8 that can be produced by combining 78.0g of each reactant? 8SO2+16H2S⟶3S8+16H2O
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