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olya-2409 [2.1K]
3 years ago
13

. Which of the following do low pressures not produce?

Chemistry
1 answer:
aleksley [76]3 years ago
3 0

Answer:

the question is incomplete

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Since greenhouses are designed to trap in heat, we call global warming the “greenhouse effect” because it essentially does the same thing. “Greenhouse” gases (gases that easily trap heat) clog up the outer layers of the atmosphere and prevents heat from leaving the planet. The gases trap heat, just like greenhouses.
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3 years ago
PLZZ HELP!!
Akimi4 [234]

Answer:

12

Explanation:

23-11, why?, because, the difference between atomic and mass number is the neutron number which most a times is equivalent to the electron number.

6 0
3 years ago
Consider the halogenation of ethene, where x is a generic halogen: h2c=ch2(g)+x2(g)→h2xc−ch2x(g) you may want to reference (page
KengaRu [80]
Consider the halogenation of ethene is as follows:
CH₂=CH₂(g) + X₂(g) → H₂CX-CH₂X(g)
We can expect that this reaction occurring by breaking of a C=C bond and forming of two C-X bonds.
When bond break it is endothermic and when bond is formed it is exothermic.
So we can calculate the overall enthalpy change as a sum of the required bonds in the products:
Part a) 
C=C break = +611 kJ
2 C-F formed = (2 * - 552) = -1104 kJ
Δ H = + 611 - 1104 = - 493 kJ

2C-Cl formed = (2 * -339) = - 678 kJ
ΔH = + 611 - 678 = -67 kJ

2 C-Br formed = (2 * -280) = -560 kJ
ΔH = + 611 - 560 = + 51 kJ

2 C-I Formed = (2 * -209) = -418 kJ
ΔH = + 611 - 418 = + 193 kJ

Part b)
As we can see that the highest exothermic bond formed is C-F bond so from bond energies we can found that addition of fluoride is the most exothermic reaction
8 0
3 years ago
If you are running at top speed and try to stop suddenly, what happens?
vlada-n [284]

You are going to fall, face first on the ground.

7 0
2 years ago
A chemical reaction occurs when one or more change into one or more new substances called
attashe74 [19]
Changes into new substances called product.
6 0
3 years ago
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