Homework Help for Chemistry

Copper, 1.04 g is dissolved in nitric acid, to produce copper(II) nitrate, which when reacted with NaOH and heated, produces 1.19 g of copper oxide, which is isolated and dried. What is the percent yield for the production of copper oxide?

Answer to the nearest integer without the % sign (example: 74)

what is the chemical formula of milk of magnesia

A chemist reacts 10.5 g of ag with 7.5 g of s in the reaction from the previous question what’s the percent yield if a chemist actually obtains 9.8 g of ag2s in the lab

Diels alder lab

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Beano contains an enzyme that breaks down polysaccharides into smaller, more digestible sugars, which diminishes the intestinal gas formation that can occur after eating foods such as vegetables and beans. (20.1, 20.2, 20.5) a. The label says “contains alpha-galactosidase.” What class of enzyme is this? b. What is the substrate for the enzyme? c. The directions indicate you should not cook with or heat Beano. Why?

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Beano contains an enzyme that breaks down polysaccharides into smaller, more digestible sugars, which diminishes the intestinal gas formation that can occur after eating foods such as vegetables and beans. (20.1, 20.2, 20.5) a. The label says “contains alpha-galactosidase.” What class of enzyme is this? b. What is the substrate for the enzyme? c. The directions indicate you should not cook with or heat Beano. Why?

Visible light falls into wavelength ranges of 400-700 nm, for which 

. 

The energy and wavelength of light are related by the equation

where 

 is energy in Joules, 

 is Planck's constant (

), 

 is the speed of light (

), and 

 is the wavelength in m.

If a visible light photon has a wavelength of 452.2 nm, what is the energy of the photon (in J)?

shown below is a lineweaver burk plot displaying the kinetics for an enzyme catalyzed reaction with 800 pmol of enzymes in both the absence and presence of 100 concentration of an inhibitor (triangle is in presence of inhibitor and circle represents absence of inhibitor)

Calculate the molecular weight of phosphorus if 2.3437 grams are dissolved in 50.000 grams of para-dibromobenzene and the solution freezes at 81.35 degrees Celsius. What is the molecular formula for phosphorus?

Suppose you are instructed to measure the density of a different metal using a 50ml pycnometer. The mass of the pycnometer is 23.721g. After filling the pycnometer with water at 24.0 C, you find the mass of the pycnometer and water is 72.457g. The water is emptied out and the metal is placed in the pycnometer. The metal, by itself, is found to weigh 51.118g. The pycnometer with the metal in it is filled with water again and the pycnometer, water, and metal are found to weigh 115.442g. What is the density of the metal?

An ion has the following Lewis structure where X is an unknown element.

Which of the following elements could be X?

Cl   Xe   Ne   F   Kr   Br  

(There may be more than one possible answer.)

Enter your answer by typing the symbol of the element(s) in the box below. If more than one element is possible, separate the symbols of the elements with a comma.

If a container can hold 2.0 gallons and 5.0 liters of water are added how many more liters of water can be added to completely fill the 2.0 gallon container