So since the student neglected to add sodium carbonate the caffeine won’t be pure but the student would still be able to recover a large amount of caffeine. The literature melting point is 238°C. Because the caffeine wasn’t pure enough‚ the observed melting point was a little off. 2. The weight of the purified caffeine is often much lower than the weight of the crude caffeine. Explain why the percent recovery is frequently low. • Crude caffeine contains contaminants‚ such as organic compounds‚ while
Premium Chemistry Water Tea
Percent Acetic Acid in Vinegar Introduction: Acetic acid is reactive when combined with calcium carbonate. In this lab‚ we will use vinegar for its acetic acid and egg shells for their calcium carbonate. Marketable vinegar differs in its acetic acid concentration from 4-6%. Calcium carbonate reacts with the acetic acid in vinegar to produce carbon dioxide‚ water‚ and calcium acetate as represented by the equation: CaCO3 + 2HC2H3O2 CO2 + H2O + Ca(C2H3O2)2. The calcium carbonate reacts with
Premium Acetic acid Calcium carbonate
Determining The Percent Copper and Zinc in Pennies From Density Purpose: Practicing determine the density of the solution. Developing the method for determine the percent of density for the solution. Examining the linear relationship by learning to use the best-fit straight line. Using the linear relationship to determine the percent of density by the solution. Be familiar with recording data and observations. Methods & Material: Methods: Weight the mass for the different percent of zinc and
Premium Zinc Mixture Copper
In her essay “Being an Other” Melissa Algranati talks about how she didn’t know what race category she belonged to because of her ethnic background. Algranati’s father was born in Alexandria‚ Egypt and her mother was born in Maniti‚ Puerto Rico. She is a product of marriage‚ and her race is a Puerto Rican Egyptian Jew. She explains how her upbringing was different because of her parents’ different racial barriers. Algranati’s supports her issue and also gives emotional appeal about her childhood
Premium Ethnic group Race Race and ethnicity in the United States Census
characteristic about the countryside is that it is beautiful and peaceful. The air is fresh and the surroundings green. This is because the countryside is free from pollution‚ be it air‚ land or noise pollution. There no such perfect peaceful view that you can see other than in the countryside. There are no crowded streets and heavy traffic in the countryside. Thus there are no fumes from cars and smoke from factories buildings to pollute the air. The trees surrounded the countryside help the people from inhaling
Premium Pollution
the response “I would prefer not to” when faced with a command from his employer. Through the use of key words such as “would” and “prefer”‚ Melville gives Bartleby the appearance of submitting to his employer’s‚ the lawyer’s‚ judgment and authority. This display of subordinance‚ however‚ is only an illusion. Bartleby rejects the capitalist hierarchy on which Wall Street is built and thus also rejects the lawyer’s authority. What exactly does Bartleby “prefer not to do”? He prefers not to comply with
Premium Capitalism Karl Marx
baby You don’t know how incredibly happy you make me. I have fallen head over heels for you. you are everything I could possibly want and more. Words can’t even begin to explain the way you make me feel‚ you are my other half. you are what I think about every night before I go to sleep‚ and the first thing on my mind when I wake up in the morning. I get the most amazing feeling every time I’m talking to you‚ and you take my breath away every moment we’re talking. They say there’s no such thing as perfect
Premium 2006 singles Billboard Hot Country Songs number-one singles 2004 singles
Down with the Top Ten Percent Many colleges try to have a racially diversified environment by using affirmative action. Some colleges used the point system which would give an edge to minorities over Caucasians. The supreme court of Texas prohibited colleges to use affirmative action. When affirmative action was prohibited‚ minority enrollments at colleges decrease. To racially diversify colleges‚ Legislature passed the top ten percent rule. The top ten percent rule states any high school
Premium
how eloquently she sings a song‚ whose meaning he knows not but yet‚ can feel the song touch his heart‚ though he may not comprehend the real intent of the lyrics‚ the language being unknown to him. The poet‚ with artistic elements of poetry‚ compares the song of the Highland Lass with the relatively dim sweetness of other objects and he seems to be successful in his work of contrast‚ but despite his comparisons‚ he wonders what the meaning of the song might be. The isolation of the girl makes
Premium William Wordsworth Poetry Romantic poetry
Many parents are agonizing about aspects between single-sex school and co-ed school (coeducational school) in relation to what is best for their children. Hence‚ to justify which is a much preferred choice in respect to differences between the two kinds of school as well as its benefits and disadvantages. It is only natural‚ of course‚ for parents to be concerned especially in matters that concern their children. A minority of parents will choose to send their children to single-sex school
Premium Education