03/25/17

Can h2o2 be a good way to find out if you have pyrite?
My friend gave me a ounce of "gold" but I don't know if he was correct.
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03/25/17

how many joules are required to change to the temeprature of 300 grams of water ar 40.0 degrees celsius
need help with a chemistry question that has me stumped  
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03/25/17

Calculate the partial pressure of diethylether.
A sample of 5.50 mL of diethylether (C2H5OC2H5; density= 0.7134 g/mL) is introduced into a 6.50 -L vessel that already contains a mixture of N2 and O2, whose partial pressures are Pn2= 0.751 atm... more
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03/25/17

How many grams of CaH2 are needed to generate 144L of H2 gas if the pressure is 824 torr at 22 degrees C?
calcium hydride reacts with water to form hydrogen gas 
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03/24/17

How many grams of CaH2 are needed to generate 144L of H2 gas if the pressure is 824 torr at 22 degrees C?
CaH2 (calcium hydride)
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03/24/17

What volume would the propane occupy at STP?
An aerosol spray can with a volume of 250mL contains 2.30g of propane gas (C3H8) as a propellant.
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03/24/17

total charge for customer getting 6 items priced $67.21 each, 4 items $5.70 each, 1 item $135.00, 1 item $6.00, less 6 credits of $65.00 each?
What is the total charge for a customer getting 6 items priced at $67.21 each, plus 4 items priced at $5.70 each, plus 1 item priced at $135.00, plus 1 item priced at $6.00, less 6 credits of... more
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03/23/17

The complex ion Co(H2O)6 +2(aq) is pink when placed in solution. Addition of chloride ions creates CoCl, in the solution which is blue in color. Write the balan
iodine clock- Reaction Kinetics 
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03/23/17

Which is the central element for all living things?
Which is the central element for all living things?
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03/23/17

How many liters of a 8% salt solution must be mixed with 14 liters of a 38% salt solution to obtain a 20% salt solution?
I need help with solving this word problem
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03/23/17

A radioactive isotope has a half-life of 15 years, and a lab has a 100g sample.
1. Write an Equation to model the situation  2. Determine how long it will take for the sample to be reduced to 2 grams
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03/23/17

John paid $196.61 for a pair of pants and paid 6.25%. Find price of pants
im confused  
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03/22/17

If 13.3 g of CaCl2 are present in 150 mL of aqueous solution, what is the concentration in terms of the following?
a. molarity b. weight/volume percent c. parts per thousand d. parts per million e. parts per billion
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03/22/17

The normal concentration range of vitamin B12 in blood serum is 160-170 ng/L. Express this concentration range in parts per million and parts per billion
Lower range value: Upper range value: Lower range value: Upper range value:
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03/22/17

a. How many moles of Ar are present in a 1.00 qt flask that has a pressure of 625 torr at a temperature of 35°C?
a. How many moles of Ar are present in a 1.00 qt flask that has a pressure of 625 torr at a temperature of 35°C? b. What is the mass of this Ar?
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03/22/17

A 150.0 mL flask contains 610. g of N2 at 0°C.
a. What is the pressure in atm? b. What is the pressure in torr? Enter your answer in scientific notation. c. What is the pressure in psi? Enter your answer in scientific notation.
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03/22/17

reaction A->B, determine the activation energy and frequency factor (Arrhenius constant) of the reaction. k (M/s) 0.681 0.715 T(K) 500 1000
Chemistry Kinetics
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03/22/17

An aquarium has 72 fish in it. The number of females (F) is twice the number of males (M) How many males and females are in the aquarium
I need help with this math equation and i have class next period so can any of you guys help?
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03/22/17

A mixture of gases contains 0.40 mol of N2, 0.10 mol of O2, and 0.90 mol of He.
a. What is the partial pressure of each gas (in atm and in torr) in a  20.0  L cylinder at  260  K? N2: O2: He:
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03/22/17

A 150.0 mL flask contains 760. g of N2 at 0°C.
What is the pressure in atm? What is the pressure in torr? Enter your answer in scientific notation. What is the pressure in psi? Enter your answer in scientific notation.
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03/22/17

Potassium iodide (KI) is used to treat iodine deficiencies. What is the %(w/v) of a 45 mL solution containing 4.2 g of KI?
Potassium iodide (KI) is used to treat iodine deficiencies. What is the %(w/v) of a 45 mL solution containing 4.2 g of KI?
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03/22/17

How many moles of N2 are present in a 1.00 qt flask that has a pressure of 475 torr at a temperature of 35°C?
How many moles of N2 are present in a 1.00 qt flask that has a pressure of 475 torr at a temperature of 35°C? What is the mass of this N2?
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03/22/17

Dan added a teaspoon of powder 1 and a teaspoon of a new powder {powder 3} to 100mL of water. Powder 1 dissolved completely. Power 3 did't dissolved.
Which of the following methods would be the first step in separating powder 1 from powder 3?   Answers)) a)distillation b)filtration c)evaporation d)boiling  I really don't know which one is... more
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03/22/17

A - 102856.67 = 14.93% of A
What is the value of A and what's 14.93% value
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03/22/17

a boat can travels 48 miles downstream in 4 hours and can make a return trip in 6 hours. find the speed of the boat in still water
Use two equations in two variables to solve the problem.
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