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beks73 [17]
4 years ago
9

As ice melts and changes from solid to liquid, A) entropy increases. B) kinetic energy decreases. C) an exothermic reaction occu

rs. D) the random movement of molecules remains constant.
Chemistry
1 answer:
Mazyrski [523]4 years ago
3 0

Answer:

C) Because it gets hotter

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What is the approximate bond angle around the central carbon atom in acrolein?
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Hello!

The approximate bond angle around the central carbon atom in acrolein is 120°

The structure of acrolein is shown in the figure below. From the structure, we can deduce that the central carbon atom is in an sp2 hybridization (Atoms with a double bond hybridize in an sp2 fashion).

Atoms with sp2 hybridization have trigonal planar geometry, in this kind of hybridization, bonds are oriented the farthest away possible from each other, to minimize overlapping and the angle that allows that is 120°. 

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4 years ago
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The rate constants of some reactions double with every 10 degree rise in temperature. Assume that a reaction takes place at 271
AfilCa [17]

Answer : The activation energy for the reaction is, 119.7 J

Explanation :

According to the Arrhenius equation,

K=A\times e^{\frac{-Ea}{RT}}

or,

\log (\frac{K_2}{K_1})=\frac{Ea}{2.303\times R}[\frac{1}{T_1}-\frac{1}{T_2}]

where,

K_1 = rate constant at 271 K

K_2 = rate constant at 281 K = 2K_1

Ea = activation energy for the reaction = ?

R = gas constant = 8.314 J/mole.K

T_1 = initial temperature = 271 K

T_2 = final temperature = 281 K

Now put all the given values in this formula, we get:

\log (\frac{2K_1}{K_1})=\frac{Ea}{2.303\times 8.314J/mole.K}[\frac{1}{271K}-\frac{1}{281K}]

Ea=119.7J

Therefore, the activation energy for the reaction is, 119.7 J

3 0
4 years ago
A 5.00 g sample of a pure substance powder is heated, and the powder leaves 4.63g of a shiny, metallic liquid. Is the powder an
ElenaW [278]

Answer:

compound

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We already know that the original substance was pure. If this substance was pure and it was powdery in nature then we have a footing to start from.

Secondly, a 4.93 g of shinny metallic liquid was left behind. This shinny metallic liquid must be an element.

Since there was a loss in mass during heating, it follows that there were other components of the pure powder.

If the reasoning stated above is correct, then the substance is a compound.

8 0
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