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Our nearest star (other than the Sun) is 4.2 light-years away. That is, it takes 4.2 years for the light it emits to reach Earth. How far away is it in metres? Give your answer to 3 sf.
consider the case of sulfurous acid which is quantitatively formed when sulfur dioxide gas dissolves in water.a without
Problem- How many hydrogen bonds exist between this DNA strand and its complementary strand. 5'-CGTCGAG-3'
Sodium lauryl sulfate can be prepared by replacing chlorosulfonic acid with another reagent. What could be used? Show the equations.
If a 1.2 g sample of C3H6O is burned completely in excess oxygen to yield CO2 (g) and H2O (l) at 25 C, releasing 38.22 kJ of energy. Explain what is the enthalpy of formation of C3H6O
Question- Draw the substitution products for the following reaction, assuming that the reaction is carried out under SN2 conditions. If the products can exist as stereoisomers, show what stereoisomers are formed: (3S,4S)-3-bromo-4-methylhexane + C..
could 131g of xenon gas in a vessel of volume 1.0dm^3 exerts a pressure of 20 atm at 25C if it behaves as a gas? if not what pressure would it exert? (b) what pressures would it exert if it behaved as a van der waals gas?
when 2.45g of an unknown weak acid ha with a molar mass of 85.0gmol is dissolved in 250.0g of water the freezing point
Explain a layer of peat beneath the glacial sediments of the last ice age has a carbon-14/carbon-12 ratio that is 21.4% of that discovered in living organisms. Explain how long ago in yr was this ice age
A rectangular block of plastic, measuring 1.34 cm by 2.27 cm by 1.39 cm, floats in the middle of the Pacific Ocean. The volume of sea water displaced by the plastic block is 3.35 cm3. Assuming the density of the sea water is 1.025 g/mL, what is th..
What alkene (including cis and trans isomers) would be produced by the dehydration of the following alcohols? Where possible, predict the relative amounts of each product according to Zaitsev's rule. a. 3-pentanol b. 2-methyl-2-butanol c. 1-butano..
How many grams of formic acid, HCOOH, must be added to 0.240 L of 0.110 M sodium formate, HCOONa, to yield a buffer solution with a pH of 3.50. Assume no volume change. Ka of HCOOH = 5.0 10-4
The nitro substituent was introduced in meta position of the methyl benzoate in nitration of methyl benzoate. Why does it prefer the meta position and not ortho and para
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