10/06/17

problem question
The manager of a fish store has water that is 10% salt and water that is 25% salt. He needs to fill an aquarium with 10 gallons of water that is 20% salt. use a linear equation to find how many... more
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10/06/17

The water level in a graduated cylinder initially at 210 mL rises to 282 mL after a piece of lead is submerged. What is the mass in grams of the lead?
it is chem i  need help
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10/06/17

The rate of a chemical reaction increases under the conditions (1)to(3). Explain the reason.
The rate of a chemical reaction increases under the conditions (1)to(3). Explain the reason. (1) Concentration of the reactants is high. (2)Temperature of the reaction system is high. (3)Catalysts... more
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10/05/17

Stoichiometry
What mass of oxygen molecules would have the same number of electrons as 147.80 grams of sulfide ions?
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10/05/17

How many grams of lithium hypochlorite are there in 1.54 moles
Moles grams molecules
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10/05/17

Walter is mixing cement for his new patio. He knows he needs to use water-to-cement ratio of 20 to 30. What percent of his total mixture is water?
I know the answer just don’t know how to explain
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10/05/17

calculate the volume of the equation. Chemistry help
  calculate the volume (in mL) of 0.025 M KMnO4 solution needed to completely react with 10.0 mL of advertised 3% by mass H2O2 solution in the presence o excess acid. Assume that the density of... more
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10/05/17

what temperature does the fahrenheit and celsius temperature scales give the same reading
what temperature does the fahrenheit and celsius temperature scales give the same reading?
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10/05/17

When compound A is partitioned between equal volumes of methylene chloride and water
When compound A is partitioned between equal volumes of methylene chloride and water one finds that the partition coefficient is equal to 1. This means that the compound happens to be equally... more
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10/05/17

Stoichiometry
Find the formula of the food enhancer MSG which has a composition of 35.51% C, 37.85% O, 8.29% N, 13.60% Na, and 4.77% H
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10/05/17

Stoichiometry
What volume of hydrogen gas (at STP) contains the same number of hydrogen atoms as 1.00 g of glucose (C6H12O6)?
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10/05/17

What does the color indicate about the strength of the acid or base?
for highschool  
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10/05/17

Why does calorimetry experiments on combustion usually give you lower values than expected values
Why does calorimetry experiments on combustion usually give you lower values than expected values
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10/04/17

I crushed an aspirin tablet and got 341.5 mg which is more than a typical tablet weights (325 mg) why did this happen?
We crushed 2 aspirin pills in lab and got the weight to be 683 mg. Divide that by 2 and each pill weighs about 341.5 mg. The pill weight on the bottle read 225 mg. Our percent error is, therefore,... more
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10/04/17

Assume that water flows out of an elephant trunk at 7.57 liters per minute. At this rate how long does it take to fill rhe 5 gallon bottle?
It is converting inbetween units
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10/04/17

Need help with this Co2 problem
1. The gas tank of a 2013 Honda Accord holds 17.2 gallons. How many pounds of carbon dioxide are produced by burning an entire tank of gas?
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10/04/17

how to use faradays law in the question?
A student wants to plate a clasp on a school lanyard with nickel. a) Suggest a substance that the student could use as an anode. (include rationale) b)The student wants to plate 5.0 g of nickel... more
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10/04/17

Sorry this is my question it was incomplete
A chemical antifreeze company mixes pure water with their premium antifreeze solution to create an inexpensive antifreeze mixture. The premiun solution contains 95% pure antifreeze. The company... more
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10/04/17

Im not sure how to do this question can anyone help? is faradays law suppose to be used?
A student constructs an electrochemical cell using a Zn/Zn2+ half-cell and a Cu/Cu2+ half-cell. The zinc electrode is immersed in a zinc sulfate solution and the copper electrode is immersed in a... more
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10/04/17

Can you help me with this Chemistry Problem?
CH4 flows into a catalytic converter at 25.0atm and 300 degrees celsius at a rate of 1000 L/min. Hydrogen flows into the reactor at 25.0atm and 300°C at 1500 L/min If 15.0 kg of C2H6 is collected,... more
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10/04/17

A sample of helium has a volume of 3 liters when the pressure is 500 torr. What volume does the gas occupy at 300 torr?
No additional details
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10/04/17

Temperature,time and the addition of other ingredients affects egg coagulation
eggs 
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10/03/17

Which statement describes an example of a chemical property of a metal statue?
a. It is solid.b. It is shiny.c. It is silver.d. It can tarnish.
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10/03/17

Which statement describes an example of a chemical property of a metal statue?
a) it is a solid b) it is shiny c) it is silver d) it can be tarnish
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10/03/17

A scientist has two solutions, which she has labeled Solution A and Solution B. Each contains salt. She knows that Solution A is 20% salt and Solution B is 7
A scientist has two solutions, which she has labeled Solution A and Solution B. Each contains salt. She knows that Solution A is 20% salt and Solution B is 70%salt. She wants to obtain 160 ounces... more
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