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Explain the principle of automobile seat belts in terms of Newton's first law The gravitational force is said to have an infinite range. What does this mean? Describe the relationship between
(a) force and acceleration, and
(b) mass and acceleration.
the titration of acetic acid with sodium hydroxide can be expressed as the combination of two reactions: the acetic acid reacting with water, and the sodium hydroxide reacting with hydronium ion.
In the following experiment, a coffee-cup calorimeter containing 100. of is used. The initial temperature of the calorimeter is 23.0 . If 6.80 of is added to the calorimeter, what will be the final temperature of the solution in the calorimeter
Why might the apparent yield be too large?
a solid substance a is soluble in water to the extent of 10 mgml of water at 25 degrees c and 100 mgml of water at 100
Rita divides Avogadro's number (approximately 6.022 mc002-1.jpg 1023) by 2.0550 to calculate the number of atoms in a sample.
Why is it essential to wash the recrystallized material with cold, not warm or hot, solvent. What might occur if the wash with cold solvent was omitted
The half-equivalence point of a titration occurs half way to the end point, where half of the analyte has reacted to form its conjugate, and the other half still remains unreacted.
What velocity would an electron (9.11x10^-31kg ) need for its de Broglie wavelength to be that of red light (745 nm)?
What is the major purpose of doing distillations in organic chemistry. What is the secondary purpose
Complete the chemical equation that show the release of hydroxide ions as each of the following bases dissolves in water:
compare the stabilities of each of the four conjugate bases that would be formed from the doprotonation of the four different OH groups and determine which of hte OH is most acidic.
Propose mechanisms for the formation of fragments with m/z 69, 43 and 41 in the mass spectra of CH3CH=CHC(O)CH3 and briefly explain the absence of fragments from the McLafferty rearrangement.
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