Tuesday, October 14, 2008
Thursday, May 15, 2008
Comparing Solubility of Sugar in Water and Rubbing Alcohol
For my experiment I found the solubility of sugar in water and the solubility of sugar in rubbing alcohol. For the solubility of sugar in water, I first added 150g of sugar to 100mL because the theoretical solubility is 179.2g. After stirring the mixture for 2 minutes, there were still sugar crystals on the bottom of the beaker so I filtered the mixture. The experimental solubility of sugar in water was 134.5g.
For the solubility of sugar in rubbing alcohol, I couldn’t find the theoretical solubility. So, I first added 100g because of the solubility of sugar in water was over 100g. After stirring for 2 minutes, little to none of the sugar dissolved! When I finished filtering and decanting the mixture, I came to the conclusion that sugar is insoluble in rubbing alcohol.
There are many reasons why the solubilities of sugar in water and in rubbing alcohol are very different. The particles in water have less attractive forces for each other than for the particles of the sugar. Also, each water particle can hold many sugar particles, and rubbing alcohol particles can’t hold any. The rubbing alcohol particles have more attractive forces between each other than the sugar particles. The sugar particles stay in their lattice structure in rubbing alcohol because they have no attraction to the rubbing alcohol particles.
For the solubility of sugar in rubbing alcohol, I couldn’t find the theoretical solubility. So, I first added 100g because of the solubility of sugar in water was over 100g. After stirring for 2 minutes, little to none of the sugar dissolved! When I finished filtering and decanting the mixture, I came to the conclusion that sugar is insoluble in rubbing alcohol.
There are many reasons why the solubilities of sugar in water and in rubbing alcohol are very different. The particles in water have less attractive forces for each other than for the particles of the sugar. Also, each water particle can hold many sugar particles, and rubbing alcohol particles can’t hold any. The rubbing alcohol particles have more attractive forces between each other than the sugar particles. The sugar particles stay in their lattice structure in rubbing alcohol because they have no attraction to the rubbing alcohol particles.
Friday, January 25, 2008
Eleanor Davies-Colley
Eleanor Davies-Colley
Born: August 21, 1874
Died: December 10, 1934
Famous For: Eleanor was one of the earliest women in the UK to become a surgeon. She was also the first female fellow of the Royal College of Surgeons. Eleanor co-founded the South London Hospital for Women and Children and was a founding member of the Medical Women’s Federation. She worked at many places as a surgeon or a teacher including the New Hospital for Women, the London School of Medicine, the South London Hospital, and the Marie Curie Cancer Hospital.
Challenges Faced: Eleanor was a feminist and was trying to work at an (at that time) almost all man profession. She was trying to make women’s lives easier and prove that they can do anything men can do, and sometimes better. Also, she was trying to raise funds to open an all-women staffed Women and Children Hospital, which would have been difficult because men didn’t support women working at an all man profession back then.
Interesting Facts: - family had over 200 years of medical tradition
- father was a surgeon, like her
- cousin was a feminist, like her
- before becoming a surgeon she worked for children’s charities
- was a surgeon for almost 30 years: from 1907 up until when she diedRoyal College of Surgeons’ lecture theatre was refurbished and dedicated in memory of Eleanor in 2004
Born: August 21, 1874
Died: December 10, 1934
Famous For: Eleanor was one of the earliest women in the UK to become a surgeon. She was also the first female fellow of the Royal College of Surgeons. Eleanor co-founded the South London Hospital for Women and Children and was a founding member of the Medical Women’s Federation. She worked at many places as a surgeon or a teacher including the New Hospital for Women, the London School of Medicine, the South London Hospital, and the Marie Curie Cancer Hospital.
Challenges Faced: Eleanor was a feminist and was trying to work at an (at that time) almost all man profession. She was trying to make women’s lives easier and prove that they can do anything men can do, and sometimes better. Also, she was trying to raise funds to open an all-women staffed Women and Children Hospital, which would have been difficult because men didn’t support women working at an all man profession back then.
Interesting Facts: - family had over 200 years of medical tradition
- father was a surgeon, like her
- cousin was a feminist, like her
- before becoming a surgeon she worked for children’s charities
- was a surgeon for almost 30 years: from 1907 up until when she diedRoyal College of Surgeons’ lecture theatre was refurbished and dedicated in memory of Eleanor in 2004
Tuesday, January 8, 2008
Marjorie Lee Browne
Marjorie Lee Browne
Born: September 9th, 1914
Died: October 19th, 1979
Famous For: Marjorie is famous for many things, including being one of the first Black women in the United States to earn a Ph.D. She was also one of the first women to obtain a Masters Degree in mathematics from the University of Michigan. Marjorie wrote a thesis called On the One Parameter Subgroups in Certain Topological and Matrix Groups, and taught math at North Carolina College. In the summer Marjorie wrote sets of notes to be used by secondary school teachers for Math, and because of her work she as the first person to ever win the ‘W W Rankin Memorial Award for Excellence in Mathematics Education’, given to her by the North Carolina Council of Teachers.
Challenges Faced: Not only was Marjorie a woman trying to achieve great things during a time when women weren’t thought of as highly as men, she was also African-American in a time that prejudiced against any African-Americans, especially women. Her dad and step-mom had to keep encouraging her to study mathematics and to study to the best of her ability. Also, during the time when Marjorie would go to university, the Great Depression hit. Luckily, Marjorie could afford tuition at Howard University by loans, jobs, and scholarships.
Interesting Facts:
- Marjorie’s mother passed away when Marjorie was two, so she was raised by her dad and step-mom that were both “math whizzes”
- For 25 years while Marjorie worked at the North Carolina College she was the only faculty member in her department to have obtained a Ph. D.
- Marjorie used her money to support students by paying for a $60,000 computer for her school.
- Marjorie also helped students in the later years of her life by giving money to gifted math students to pay for their education.
- Marjorie helped whoever came to her to earn their Ph. D. and follow in her footsteps.
Born: September 9th, 1914
Died: October 19th, 1979
Famous For: Marjorie is famous for many things, including being one of the first Black women in the United States to earn a Ph.D. She was also one of the first women to obtain a Masters Degree in mathematics from the University of Michigan. Marjorie wrote a thesis called On the One Parameter Subgroups in Certain Topological and Matrix Groups, and taught math at North Carolina College. In the summer Marjorie wrote sets of notes to be used by secondary school teachers for Math, and because of her work she as the first person to ever win the ‘W W Rankin Memorial Award for Excellence in Mathematics Education’, given to her by the North Carolina Council of Teachers.
Challenges Faced: Not only was Marjorie a woman trying to achieve great things during a time when women weren’t thought of as highly as men, she was also African-American in a time that prejudiced against any African-Americans, especially women. Her dad and step-mom had to keep encouraging her to study mathematics and to study to the best of her ability. Also, during the time when Marjorie would go to university, the Great Depression hit. Luckily, Marjorie could afford tuition at Howard University by loans, jobs, and scholarships.
Interesting Facts:
- Marjorie’s mother passed away when Marjorie was two, so she was raised by her dad and step-mom that were both “math whizzes”
- For 25 years while Marjorie worked at the North Carolina College she was the only faculty member in her department to have obtained a Ph. D.
- Marjorie used her money to support students by paying for a $60,000 computer for her school.
- Marjorie also helped students in the later years of her life by giving money to gifted math students to pay for their education.
- Marjorie helped whoever came to her to earn their Ph. D. and follow in her footsteps.
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