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navik [9.2K]
3 years ago
9

In examples where the volume of a system is under constant pressure, which of

Chemistry
1 answer:
grin007 [14]3 years ago
6 0
Answer:

D


Explanation:


At constant volume, the heat of reaction is equal to the change in the internal energy of the system. ... Most chemical reactions occur at constant pressure, so enthalpy is more often used to measure heats of reaction than internal energy.
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Select the single best answer. Explain the observed trend in the melting points for four isomers of molecular formula C7H16. mp
damaskus [11]

Answer:

The ability of the molecule to pack more tightly increases the melting point.

Explanation:

In hydrocarbons of same molecular formula, melting point is determined by:

  • weak intermolecular forces
  • Molecular symmetry

Higher the intermolecular forces and molecular symmetry, higher will be the melting point.

Intermolecular forces in hydrocarbons decreases with branching. Moreover, branching interfere the tight packing of the molecule in the crystal. Therefore, branched hydrocarbons tend to have lower melting point.

However, in highly branched hydrocarbons molecular symmetry increases which results in tight packing of the molecule in the crystal.

So, highly tight packed molecules tend to have high melting point.

As (CH3)2CHC(CH3)3 is highly branched and has high molecular symmetry, therefore, its melting point is highest among given.

So, among the given, option c is correct.

5 0
3 years ago
Soil particles, soot, lead (pb), asbestos, sea salt, and sulfuric acid droplets are all types of?
Crazy boy [7]

Soil particles, soot, lead (pb), asbestos, sea salt, and sulfuric acid droplets are all types of particulate matter.

The atmosphere is dusty .The solid and liquid particles suspended in the atmosphere .

Examples : Soil particles, soot, lead (pb), asbestos, sea salt, and sulfuric acid droplets are all types of particulate matter

There are different categories of particulate matter. Such as mold spores , bacteria , dust , smoke and airborne viral paricles. The major sources of particulates matter are wildfires , dust storms , sea spray , volcanic eruption , and industrial process.

To learn more about  sulfuric acid,

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6 0
2 years ago
In an exothermic reaction, energy may be released to the surroundings in the form of?
djverab [1.8K]

Answer:

All of the above

Explanation:

Exothermic reactions release energy usually in the form of heat, but also in a form of light (e.g. a spark, flame, or flash), electricity (e.g. a battery), or sound (e.g. explosion heard when burning hydrogen)

:D

7 0
4 years ago
In most aqueous reactions as temperature increases, the effectiveness of collisions between reacting particles
aleksley [76]
The more energy the more aqueous. Which can affect collision into increasing. Meaning B. increases :) 
3 0
3 years ago
What occurs when a 35-gram aluminum cube at 100.°C is placed in 90. grams of water at 25°C in an insulated cup?
posledela
Heat always flows from hot to cold. The aluminum is hotter than the water in the cup so the answer is 2: The heat is transferred from the aluminum to the water, and the temperature of the water increases.
8 0
3 years ago
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