12/02/17

HELP ASAP please
The extinction coefficient is 250 and the molar mass is about 30000 ( that is what I found online) You want to determine the amount of Phycocyanin in a 500 mg herbal tablet. Before analysis by... more
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12/02/17

Physics What is the pressure?
If I have a container of gas that holds 3.50 L that is initially at 1.00 ATM and 30.0 C, and the temperature is increased to 195C while the volume stays the same. What is the pressure now?
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12/02/17

HELP ASAP PLEASE
You want to determine the amount of Phycocyanin in a 500 mg herbal tablet. Before analysis by UV-Vis spectroscopy, five Phycocyanin tablets (each 500 mg) were crushed in a pestle and mortar. 1.2 g... more
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12/01/17

Can you answer this? Look at the label on a bottle of Mylanta and identify the bases responsible for the antacid acid?
Heartburn, a burning sensation in the lower throat and above the stomach, is caused by the reflux or backflow of stomach acid into the esophagus (the tube that joins the stomach to the throat). In... more
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12/01/17

A gas mixture contains 62 g of carbon monoxide and 680 g of carbon dioxide. What is the mass%, molality and mole fraction of carbon monoxide?
help me to answer this question 
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12/01/17

What was the first life form on earth?
This is for school
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12/01/17

Categorize these solids as pure substance or mixtures.Categorize the pure substances as elements vs compounds and metals vs non-metals.
Sulfur Wooden splint Copper Powder Charcoal Selenium powder Steel Wool
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12/01/17

How many ml of 0.15 M CaCl2 are needed to have 54 g of CaCl2?
help me to answer this question 
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12/01/17

Give the name s for these organic compounds (1) - (7).
Give the name s for these organic compounds (1) - (7). (1) CH3CH3  (2) CH2=CHCH3   (3)CH3CH2OH   (4) CH3COOH  
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11/30/17

We can prepare oxygen gas by decomposing hydrogen peroxide. There are many other chemical reactions that generate gases as one of their products.
Lets consider the reaction between zinc metal and hydrochloric acid as such an example. Write a procedure that explains how you would collect the gas produced from this reaction in the laboratory.
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11/30/17

An electrolytic reaction is a system in which.....
a. the same element is both oxidized and reduced. b. electricity is used to produce a chemical reaction. c. a reactant-favored reaction is forced to produce electricity by the input of heat or... more
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11/30/17

Which of the following will generate a cell voltage that is different from the standard voltage for the cell?
a. a cell temperature that is greater or lower than 298 K b. aqueous cell components that are at a concentration greater than or lower than 1 M c. gaseous cell components that are at a pressure... more
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11/30/17

Can HBr perform substitution with C3H8
a student in the 11th grade, we recently had a chemistry exam, I lost marks because of a question that asks about the reaction between HBr and C3H8. According to our teacher HBr+C3H8 is going to... more
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11/30/17

If it took Mr. Brown 5 hours to drive 300 miles to Lexington, Kentucky, what was the speed at which Mr. Brown was traveling?
i need help
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11/30/17

When 33 is added to a number the result is 13 more than 5 times the number. What is the number?
HELP!!!!!!!!!!!
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11/29/17

chemistry help
Calculate the emf of the voltaic cell: Concentration of Mg+2 (anode)  is 0.00100 M and Fe+3 (cathode) is 0.100 M   unsure how to find this
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11/29/17

A chef fills a 50ml container with 43.5g of cooking oil. What is the density of the oil
What is the density of the oil and how do you find it.
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11/29/17

calculate the volume of 0.750 mol/L sulfuric acid needed to neutralize completely 20 g if sodium hydroxide
How would you calculate the volume with the given information
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11/29/17

Chemistry Problem
How many milliliters of ammonium sulfate solution having a concentration of 0.243 M are needed to react completely with 38.8 mL of 2.53 M sodium hydroxide solution?
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11/29/17

what atomic subshells may be found in the representative elements? also known as the group A elements
i need it for the chemisrt worksheet that were doing in class.
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Lab

11/29/17

The combustion of ethane produces carbon dioxide and water.
The combustion of ethane produces carbon dioxide and water. If 27.6 g C2H6 are burned in the presence of excess ait (O2) and 76.7 g of carbon dioxide are produced, what is the percent yield?
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Lab

11/29/17

In a lab experiment, 17.5 g of iron II bromide react with 14.2 g of potassium sulfide.
In a lab experiment, 17.5 g of iron II bromide react with 14.2 g of potassium sulfide. Upon completion, 4.3 g of iron II sulfide were obtained. Determine the limiting reactant, theoretical yield... more
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11/28/17

Write the balanced equation that corresponds to the following equilibrium constant expression. Assume homogeneous equilibrium in the gas state.
K_eq = [A][B][C]
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11/28/17

Empirical & Molecular formulas of compounds
Cannizzaro determined that a certain compound of carbon and oxygen had a molecular mass of 44.0 u. This meant that a certain volume of this gaseous compound weighed 44.0 times as much as the same... more
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11/28/17

How many O atoms are in 2.50 L of CO2 at STP?
This is a chemistry homework question can‘t figure out how to do it, please help!! How many O atoms are in 2.50 L of CO2 at STP?
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