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In each case, decide if the change is a chemical or physical change.
(a) A cup of household bleach changes the color of your favorite T-shirt from purple to pink.
(b) Water vapor in your exhaled breath condenses in the air on a cold day.
(c) Plants use carbon dioxide from the air to make sugar.
(d) Butter melts when placed in the sun.
a certain monomer used in the production of polymers has one nitrogen atom and the mass composition 67.90 c 5.70 h and
An unknown material begins to emit electrons from it's surface when exposed to photons with wavelengths shorter than 540 nm. Give the threshold frequency and the work function for this material.
At 25 C the vapor pressure of water is 23.8Torr. If 10.02g of water is placed in a 3.00L flask at 25 C, will the water be completely gaseous, entirely liquid, or in both phases. If in both phases, find out the mole fraction in each phase.
An unknown acid has a molar mass of 60.05 g/mol. Given the following percent composition, what is the molecular formula. C-40 H-6.7 O-53.3
State whether the compound is soluble, insoluble or partially soluble in water, methyl alochol and Hexane. Compound Water(highly polar) Methyl alcohol Hexane (non polar)
A sample of Tl-201 has an initial decay rate of 5.88 x 10 to the 4 seconds. How long will it take for the decay rate to fall to 55/s? (Tl-201 has a half-life of 3.042 days).
Problem- Which of the following sets of 'd' ions in octahedral complexes can have both high and low spin options
If two compounds have Rf values of 0.78 and 0.32, how far will they be separated from each other on a plate when the solvent front is developed to: (a) 5 cm? (b) 15 cm
a 35.0-ml sample of 0.20 m lioh is titrated with 0.25 m hcl. what is the ph of the solution after 23.0 ml of hcl have
Identify the reaction type and propose a reasonable mechanism for the acid catalyzed reaction of 1,4-benzene dimethanol with sigma-decalactone (in a 1:1 stoichiometry).
If the inside surface of each tube were coated with wax, would the general shape of the water meniscus change? Would the general shape of the mercury meniscus change?
Consider two jars. One jar contains 100 blue spheres, and the other jar contains 25 each of red, blue, green, and yellow colors mixed together. If you were to remove 30 spheres from the jar containing the mixture (assume you get a representative d..
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