09/18/18

A student determined that an unknown liquid was soluable in an equal volume of water, had a density of approximately 0.80 g/mL and a boiling temperature of 55.5
chem questions
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09/18/18

The desity of water is 1.00 g/mL. Carbon tetrachloride is insoluable in water. Would carbon tetrachloride float on water or sink beneth water when they are comb
pre lab question
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09/17/18

How to test the conductivity of liquid substances?
How to test the conductivity of liquid substances?
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09/11/18

Molarity Written Response
Angelica made 100mL of a 3.5M salt solution. She wanted to dilute this solution to make 100mL of a 2.1M solution. She calculated that she needed 60mL of her stock solution. She added the 60mL to... more
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09/05/18

Chemistry lab
An aqueous solution absorbs 10% of incident light passed through it. Calculate the absorbance if the same solution is placed in a cell 5 times as thick?
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07/17/18

what is the smallest particle of an element and a compound
a little brief answer of that
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07/16/18

The progress of the reversible reaction A Two arrows stacked on top of each other. The top arrow points to the right. The bottom arrow points to the left. B is
The progress of the reversible reaction A Two arrows stacked on top of each other. The top arrow points to the right. The bottom arrow points to the left. B is shown in the graph below. Which line... more
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07/15/18

Colour of palm fatty acid distillate (PFAD)
Why the colour of palm fatty acid distillate (PFAD) at 100 degree C is darker than at 70 degree C?
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07/08/18

Where does a scientific model fit into the scientific process? Scientific models are created prior to the hypothesis. Scientific models are always created after
Where does a scientific model fit into the scientific process?Scientific models are created prior to the hypothesis.Scientific models are always created after both scientific laws and theories are... more
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06/07/18

What is the concentration of each gas once equilibrium is reached?
Can someone please let me know if I did this right?    1.800 mole of N2O4(g) is injected into a closed 1.00L container. Kc=4.66 x 10-3 at 298K   N2O4 (g) ⇌ 2NO2 (g)   what is the... more
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04/21/18

Chemistry! Help!!
Consider the following diprotic acid.H2A+H2O⇀↽H3O+ +HA− Ka1 =5.8×10^-3 HA− +H2O⇀↽H3O+ +A2− Ka1 =8.5×10^-4The initial concentration of H2A = 0.0010 M.1. Determine the [H3O+] at equilibrium.Since... more
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04/20/18

Question is long and on the description
On a cool autumn morning (36F) you check the air pressure in your tires before leaving for school. The gauge reads 31.7 psi. When you get home that afternoon, you check the air pressure again and... more
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02/01/18

Why carbon tetrachloride cannot be directly prepared by combining carbon and chlorine?
I am a chemistry student.keen in studies..I want to be at hand in chemistry.  
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01/26/18

Find the moles of silver if 13,594 cal is released as it goes down in temperature from 48°C to 15°C. The specific heat of silver is 0.014 cal/g°C
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01/23/18

E85 fuel is a mixture of 85% ethanol and 15% gasoline by volume. What mass in kilograms of E85 can be contained in a 14.0-gal tank?
E85 fuel is a mixture of 85% ethanol and 15% gasoline by volume. What mass in kilograms of E85 can be contained in a 14.0-gal tank?
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01/13/18

How does evaporation of alcohol remove heat energy from a person's body?
When a person has a severe fever, one therapy used to reduce the fever is an "alcohol rub". Explain how the evaporation of alcohol from a person's skin removes heat energy from the body.
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01/10/18

Glucose breaks down into elements by the unbalanced formula C6H12O6 → C + H + O. Given a sample of 0.280 moles of Glucose, how many moles of Carbon will be coll
A. 0.280 mol CB. 1.00 mol CC. 1.12 mol CD. 1.68 mol CE. 6.00 mol C
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12/26/17

What are things that I should specify to get only an answer?
I'm wondering something about atomic radius calculations.Should we specify the significant figures to solve it?If your answer is yes, is there other I ought to specify to get correct answer?... more
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12/10/17

Calculate the [Zn2 ] in the solution if the cell potential, Ecell, is -1.061 V.
A Zn wire and Ag/AgCl reference electrode (E° = 0.197 V) are placed into a solution of ZnSO4. The Zn wire is attached to the positive terminal and the Ag/AgCl electrode is attached to the negative... more
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12/02/17

Galvanization
I'm a little confused on how to find the mass of zinc consumed from the data: Mass of zinc produced: .745g Mass of Zinc electrode before 7.705g Mass of Zinc electrode after 8.450g Length of... more
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11/11/17

If a sample of phosphine contains .456 grams of P and .0440 grams of H. Calculate and write the compound empiracle formula.
No additional details
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11/11/17

One tablet of an antacid contains 680.0 mg of CaCO3. How many moles and how many particles of CaCO3 are present in the antacid?
One tablet of an antacid contains 680.0 mg of CaCO3. How many moles and how many particles of CaCO3 are present in the antacid?
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11/10/17

UV-Visible spectra or FT-IR spectra
Why can’t solid state measurements of UV-Visible spectra or FT-IR spectra be usedquantitatively but solution measurements can?
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11/07/17

2 Na(s) + 2 H2O(l) -----> 2 NaOH(aq) + H2(g) ΔHrxn = –368.6 kJ What is the amount of ΔHrxn (in kJ) when 0.5000 moles of Na is reacted completely?
Help please
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10/23/17

lithium releases two electrons readily
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