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Chemistry, 22.06.2019 10:10
For the reaction, 4 a(g) + 3 b(g) => 2 c(g), the following data were obtained at constant temperature. experiment initial[a],mol/l initial [b],mol/l initial rate,m/min 1 0.200 0.150 5.00 2 0.400 0.150 10.0 3 0.200 0.300 10.0 4 0.400 0.300 20.0 which of the following is the correct rate law for the reaction? 1. rate = k[a]2[b]2 2. rate = k[a][b] 3. rate = k[a]2[b] 4. rate = k[a][b]2
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Chemistry, 23.06.2019 11:20
The chemical composition of soil varies with depth. an article in communications in soil science and plant analysis describes chemical analyses of soil taken from a farm in western australia. fifty specimens were each taken at depths 50 and 250 cm. at a depth of 50 cm, the average no3 concentration (in mg/l) was 88.5 with a standard deviation of 49.4. at a depth of 250 cm, the average concentration was 110.6 with a standard deviation of 51.5. find a 95% confidence interval for the difference in no3 concentrations at the two depths.
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Chemistry, 23.06.2019 17:20
What is the relationship between ka and kb with kw? the sum of ka and kb equals the auto-dissociation constant for water. the product of ka and kb equals the auto-dissociation constant for water. the quotient of ka and kb equals the auto-dissociation constant for water. the difference of ka and kb equals the auto-dissociation constant for water.
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Chemistry, 24.06.2019 02:00
The achilles tendon connects the muscles in your calf to the back of your foot. when you are sprinting, your achilles tendon alternately stretches, as you bring your weight down onto your forward foot, and contracts to push you off the ground. a 70 kg runner has an achilles tendon that is 15 cm long and has a cross-section area of 110 mm2 typical values for a person of this size. part a by how much will the runner's achilles tendon stretch if theforce on it is 8.0 times his weight? young's modulus for tendor is 0.15*1010n/m2. express your answer to two significant figures and include the appropriate units. part b what fraction of the tendon's length does this correspond.
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What causes an electron in an atom to move to a higher energy level
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