2,221 Answered Questions for the topic organic chemistry

Organic Chemistry Chemistry

10/04/21

Need to know the formulas and understand it, please
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Organic Chemistry Chemistry Biochemistry

10/04/21

help me understand calculation

I don´t understand how i will get the procentage I would love to get it described very basic from start so I can start understand the rest of our questions please. Calculate the mass of acetic... more
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Organic Chemistry Chemistry Biochemistry

10/04/21

Help me understand how i calculate the percentage of mass
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Organic Chemistry Chemistry Biochemistry

10/04/21

Calculate the amount needed for a certain concentraintion- please explain detailed so I understand

Calculate the amount of β-mercaptoethanol needed in a 15 ml extraction buffer to obtain a concentration of 10 mM. β-mercaptoethanol is available as a 98% (W/W) solution. Assume a molecular weight... more
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Organic Chemistry Science Chemistry Biochemistry

10/04/21

Classify as mixture or pure substance
Classify as mixture or pure substanceA. Gasoline B. Oxygen gas C. Milk D. Mercury (Hg) used in a thermometer E. A tablespoon of sugar (C12H22O11)
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Organic Chemistry Science Chemistry Biochemistry

10/04/21

Identify the change as Physical or Chemical
Identify the change as Physical or ChemicalA. Mothballs vaporize in a closet B. A flashlight corrodes on storage.C. A piece of rubber stretches when pulled.D. Alcohol feels cool when it evaporates... more
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Organic Chemistry Science Chemistry Chem

10/04/21

Is the baking soda an element or compound? Why?
When 1.00-gram sample of baking soda is heated, a gas is formed. The solid that remains weighs less than 1.00 g and does not have the same properties as the original sample. Is the baking soda an... more
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Organic Chemistry Chemistry

10/02/21

A cereal contains 11.0 grams of sucrose (C12H22O11) per 60.0 grams of cereal. How many grams of cereal must be eaten to consume 0.0424 moles of sucrose?
Not sure how to approach this any help would be greatly appreciated.
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Organic Chemistry

10/02/21

Chemistry homework
A  container holds a mixture of two gases at  The partial pressures of gas A and gas B, respectively, are  and  If  of a third gas is added with no change in volume or temperature, what will the... more
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Organic Chemistry Chemistry

10/01/21

my tutor gave me I dont understand how answer this
How many moles of H2 can be produced from x grams of Mg in magnesium-aluminum alloy? The molar mass of Mg is 24.31 g mol−1.Express your answer in terms of x to four decimal places (i.e., 0.5000x).I... more
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Organic Chemistry Chemistry

10/01/21

my tutor gave me I dont understand how answer this
Air is about 78.0% nitrogen molecules and 21.0% oxygen molecules. Several other gases make up the remaining 1% of air molecules.What is the partial pressure of nitrogen in air at atmospheric... more
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Organic Chemistry Chemistry

10/01/21

chemistry question I dont get
Calculate the density of oxygen, O2, under each of the following conditions:STP1.00 bar and 35.0 ∘CExpress your answers numerically in g L−1. Enter the density at STP first and separate your... more
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Organic Chemistry Chemistry

10/01/21

chemistry question I dont get
Helium-oxygen mixtures are used by divers to avoid the bends and are used in medicine to treat some respiratory ailments. What percent (by moles) of He is present in a helium-oxygen mixture having... more
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Organic Chemistry Chemistry

10/01/21

chemistry question I dont get
Typically, when a person coughs, he or she first inhales about 2.00 L of air at 1.00 bar and 25 ∘C. The epiglottis and the vocal cords then shut, trapping the air in the lungs, where it is warmed... more
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Organic Chemistry Chemistry

10/01/21

chemistry question I dont get
How long does it take a person at rest to breathe one mole of air if the person breathes 85.0mLs-1  of air that is measured at 25 C and 755 torr?   the answer should be in secondplease help I do... more
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Organic Chemistry Chemistry

10/01/21

How do I Convert 7.75 × 10²¹ atoms of carbon to Grams
with appropriate significant figures
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Organic Chemistry Chemistry Biochemistry

10/01/21

Acid Base question
 An acetate buffer was prepared by dissolving 0.1 mol of acetic acid and 0.11 mol of sodium acetate in 1L of water. Suppose 25 mL of 0.1 M HCl is added to 100 mL of acetate buffer. What are pH... more
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Organic Chemistry Chemistry

10/01/21

How many grams of a sodium bromide will be produced if 38.7 grams of sodium hydroxide was consumed in the reaction
Reaction: 2NaOH(aq) + CaBr2(aq) ==> Ca(OH)2 + 2NaBr(aq)
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Organic Chemistry Chemistry

10/01/21

Sodium hydroxide reacts with calcium bromide to form a new metal hydroxide and sodium bromide
Balance the equation after.
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Organic Chemistry Chemistry

10/01/21

How many particles of calcium bromide will be needed to produce 2.2 moles of the metal hydroxide as based on the reaction?
Reaction:2NaOH(aq) + CaBr2(aq) ==> Ca(OH)2 + 2NaBr(aq)
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Organic Chemistry Chemistry Pharmacology

10/01/21

How many grams of sodium bromide will be produced if 38.7 grams of sodium hydroxide was consumed in the reaction?
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Organic Chemistry Chemistry Chemical Engineering Chem

09/30/21

Match the following statements with the correct answer
In a polar covalent bond, electrons are shared ___________________.The type of bond formed between calcium and bromine is ________________The type of bond formed between phosphorus and fluorine is... more
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Organic Chemistry Chemistry Chemical Engineering

09/30/21

Match the following statements with the correct answer
In a polar covalent bond, electrons are shared ___________________.The type of bond formed between calcium and bromine is ________________The type of bond formed between phosphorus and fluorine is... more
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Organic Chemistry

09/29/21

The radioisotope strontium-90 has a half-life of 38.1 years. If a sample contains 36 mg of Sr-90, how many milligrams will remain after 152.4 years?
The radioisotope strontium-90 has a half-life of 38.1 years. If a sample contains 36 mg of Sr-90, how many milligrams will remain after 152.4 years?
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Organic Chemistry Chemistry Chem

09/29/21

Mass and percent yield?
Pinacol rearrangement experiment: Measured benzopinacol (start) = 0.502 gCollected solid (end) = 0.480 gWhat would the start and final mass be in mol?What would the percent yield be?
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