07/02/20

calculate the heat necessary to raise the temperature of 43 grams of water from room temperature (25 C) to its boiling point
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07/01/20

pH of a mixture of solutions
Q1. what will be the pH if I add 150ml of 0.1NHCl to 50ml 0.2M Na₃PO₄Q2. what will be the pH if I add 150ml of 0.1NHCl to 50ml 50mM Na₃PO₄
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06/30/20

Perform the indicated operation and give an answer with the proper number of significant figures: 48.2 m + 3.87 m + 48.4394 m
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06/30/20

Perform the following operation and express the result with the correct number of significant figures in standard notation.
2.1 ⨯ 2.336 = ?
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06/30/20

Perform the following calculation. Round your answer to the correct number of significant figures in standard notation.
2.1 ⨯ 2.336 = ?
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06/30/20

1.96 g H2 is allowed to react with 10.3 g N2, producing 1.61 g NH3.
Part a) What is the theoretical yield in grams for this reaction under the given conditions?Part b) What is the percent yield for this reaction under the given conditions?
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06/28/20

The density of a piece of ebony wood is 1.30g/cm3. What is the volume of 8.60Kg of this wood?
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06/25/20

If 4.70 g of O2 are reacted with an appropriate amount of H2. The mass of H2O produced is 3.67 g. What is the percent yield ? 2 H2 + O2 → 2 H2O
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06/25/20

The following question is purely hypothetical!
At a party, one of the balloons containing 1,770 cm^3 of air at STP can withstand a pressure of 5.57 x 10^5 Pa. If Chris sits on the balloon and reduces its volume to 295 cm^3, what is the new... more
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06/25/20

Determine the amount of heat gained by 1,250 g of water as it changes from ice at -5 degrees C to steam at 120 degrees C.
I keep getting the wrong answers. It says the correct answer is 3,829,000 J. I just need an explanation. And please don't use mol. Thank you.
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06/25/20

How much heat is required to change 235 g of iodine at 25 degrees C into vapor at 198 degrees C? (The melting point is 113.5 degrees C, and the boiling point is 185.4 degrees C.
Please don't use mol in the explanation. Thank you!
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06/25/20

How much heat must be lost to freeze 52.0 g of water at 14 degress Celsius?
Please don't use mol in the explanation. Thank you.
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06/24/20

Calculate the pH of a mixture of 100 cm3 of 0.500 mol dm–3 methanoic acid and 50 cm3 of 0.100 mol dm–3 sodium methanoate. (pKa methanoic acid = 3.75)
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06/24/20

Calculate the pH of a mixture of 25 cm3 of 0.100 mol dm–3 propanoic acid and 15 cm3 of 0.050 mol dm–3 sodium hydroxide. (pKa propanoic acid = 4.87)
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06/24/20

Calculate the enthalpy for the decomposition of glucose given the following reactions: C6H12O6(s) → 2C2H5OH(l) + 2CO2(g) ΔH = ? C6H12O6(s) + 6O2 → 6CO2(g) + 6H2O (l) ΔH = -2820kJ

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06/20/20

Let’s say a 1%(m/v) NaCl solution is “salty” (2.5g NaCl in 250 mL water). Would the water in the pond taste “salty”?
If so, can someone explain how to get the answer to this?Thank you!
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06/20/20

Write the correct chemical formula for the ionic compound strontium nitrate.

Nitrate is a polyatomic ion with a charge of -1. Its ionic forumla is NO3-1. Strontium is a group 2 atom that forms a cation with a charge of +2. Its ionic formula is Sr2+
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06/20/20

Write a chemical equation for the dissociation of strontium nitrate in water
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06/20/20

how are you able to tell if a compound produces many, few, or no ions when dissolved in water?
Doing an at home lab about conductivity for my chemistry online class which is separate from the current lesson being taught.. You must dissolve compounds such as NaCl, CaCl2.. etc into water and... more
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06/19/20

Science Please Help
3 Ba + Al2(SO4 )3 → 2 Al + 3BaSO4If you have 17 moles of Ba and 5 moles of Al2(SO4)3, what is the limiting reactant?
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06/19/20

If we have 4.57 mol of carbon dioxide gas at a temperature of 386 K and volume of 4821 mL, what is the pressure inside this vessel?
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06/19/20

A 180.0 mL solution of 2.400 M strontium nitrate is mixed with 200.0 mL of a 3.088 M sodium fluoride solution. Calculate the mass of the resulting strontium fluoride precipitate.
A 180.0 mL solution of 2.400 M strontium nitrate is mixed with 200.0 mL of a 3.088 M sodium fluoride solution. Calculate the mass of the resulting strontium fluoride... more
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06/18/20

Which element is present in all the large macromolecules in the human body?
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06/18/20

Pressure of oxygen
If the partial pressure of oxygen is the same at the top of Mount Everest (elevation above sea level 8848m) as Toronto (elevation above sea level 76m), why is it so much harder (and dangerous) to... more
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06/16/20

How many moles of ammonia would be required to react exactly with 0.470 moles of copper(II) oxide in the following chemical reaction? 2 NH₃(g) + 3 CuO(s) → 3 Cu(s) + N₂(g) + 3 H₂O(g)
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