05/12/18

What ways are chemical physical change is the same
Chemical and physical changes
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05/12/18

If one would dissolve 60g of sugar in 300g of water, what would the concentration of sugar in this syrup be?
If one would dissolve 60g of sugar in 300g of water, what would the concentration of sugar in this syrup be?
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05/12/18

Calculate the mass of water produced. Why do you think this process is not used to produce water in desert areas?
1.33 L of H2 and 0.66 L of O2 Assume all of hydrogen and oxygen react to produce water. 
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05/12/18

Understanding the definitions of heat and work.
A mixture of gaseous reactants is put in to a cylinder, where a chemical reaction turns them in to gaseous products. The cylinder has a piston that moves in or out as necessary to keep a constant... more
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05/12/18

Using specific heat capacity to find heat
calculate the energy required to heat 1.90 kg of silver from -5.1 C to 16.8 C. Assume the specific heat capacity of silver under these conditions is 0.235 J*g^-1*K^-1
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05/12/18

When KCl dissolves in water...
The answer is the K+ ions are attracted to the partially negative oxygen atoms of the water molecule. My question is, is that why does it do this? Would someone be able to explain why this happens... more
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05/11/18

Chem Question
Calculate the ratio of moles of acid to moles of base to create a 750 mL buffer solution with pH = 4.2 using acetic acid, CH3OOH, and acetate CH3COO. The ka for acetic acid is 1.8 x 10^(-5). The... more
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05/11/18

Chem Question
Consider an aqueous solution of ammonia, NH3, a base. If the resulting pH of this solution is 9.5, then what is the concentration of this ammonia solution? Note that the Ka for ammonium NH4, is... more
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05/11/18

Chem Question
Calculate the pH of a solution involving the addition of 35 mL of 0.1 M acetic acid, CH3COOH, to 350 mL of water. Ka for acetic acid is 1.8 x 10^(-5). My professor gave us the answer and wants us... more
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05/11/18

The negative change found inside the plasma membrane is created by what
Plasma membrans is created by what 
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05/11/18

Which of the following is FALSE?
The mass of matter remains constant wherever it is located. With some exceptions, matter can be seen, smelled, and felt. Matter exists in solid, liquid, and gaseous states. The weight of matter... more
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05/11/18

the number of valence electrons found in an atom from the main group element is equal too
The answer is its group numver, but I wasn't sure why that is. Can someone explain that to me please.
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05/11/18

when solutions of NaCl and AgNO3 are mixed?
The answer is a precipitate of NaNo3 and AgCl form. Can someone please help explain why this happens in more detail please.
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05/11/18

Please help, I can't figure out how to solve for the freezing point.
given the one mole of particles dissolved in 1 kg of water will lower the freezing point of water by 1.86 c.of o.50 mole of nacl is added to 1.0 kg of water. the freezing point of the solution will be more
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05/11/18

What would the molarity concentration be when 127g of aluminum chloride AlCl3 is dissolved in a total volume of 400 mL of solution?
This is a molarity concentration question and i need the full answer thank youuu  
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05/11/18

Scientific notation
A sample of microbes weighs 50 mg. There are approximately 2.5 * 10^6 microbes in a sample. What is the approximate mass of each microbe expressed using scientific Notation in grams. Show working... more
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05/11/18

How many moles of CaCl2 are in a solution of prepared by diluting 250 mL of a 3.0 M of CaCl2 to 750 mL?
I tried to use the fomrula M1V1=M2V2. but still had a hard time getting to the answer of 0.75 mole.
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05/11/18

When 200. mL of water are added to 100. mL of 12% KCl solution the final concentration of KCl is?
Assume the volumes add.
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05/11/18

How do I find the formula of Copper(1) Sulfide?
Please explain in detail the steps in order to solve this equation.
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05/11/18

Why is zinc oxidized in this reaction?
Zn(s) + 2HCl(aq) --> ZnCl2(aq) +H2(g)
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05/10/18

A certain reaction has an activation energy of 52.50 kJ/mol. At what Kelvin temperature will the reaction proceed 7.50 times faster than it did at 295 K?
please help
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05/10/18

231 mL of 1.3 pH solution of HBr is combined with 47 mL of 0.13 pH (HClO3). What’s the pH of the resulting solution?
 I need to find the pH so can you include how you found it 
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05/10/18

what makes a better battery? A lemon or a potato?
NEEDS ANSWER ASAP THANK YOU :)
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05/10/18

How many grams of calcium chloride are needed to produce 10.0 g of potassium chloride
CaCl2(aq)+K2CO3(aq)---> 2KCl(aq) + CaCO3(aq)
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05/10/18

Chemistry Question
Calculate the ratio of moles of acid to moles of base to create a 750 mL buffer solution with pH = 4.2 using acetic acid, CH3OOH, and acetate CH3COO. The ka for acetic acid is 1.8 x 10^(-5)
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