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liq [111]
4 years ago
12

Why is this reaction considered to be exothermic? a Because energy difference A is greater than energy difference C. b Because e

nergy difference A and energy difference C are about equal. c Because energy difference B is greater than energy difference A. d Because energy difference B is greater than energy difference C. e Because energy difference B is greater than energy difference C plus energy difference A.
Chemistry
1 answer:
Pani-rosa [81]4 years ago
4 0

Answer:

we would need a bit more info for this

Explanation:

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Which of these trends increase as you go from top to bottom on the Periodic Table? Select all that apply.
Oduvanchick [21]

b. atomic radius

as it goes increases when it goes down the periodic table, it decreases when going left to right. all the others decrease while going down the table.

if it helps you to remember, everything here besides atomic radius has an e in it. and if you make a connection with it to electrons, they are negative, which means they would decrease going down the table. so e=decrease while going down

thats what helped me remember it, so i hope this technique could help you too.

4 0
3 years ago
The sculpted pinnacles in Bryce Canyon National Park are the result of _____. A. differential weathering B. frost wedging C. exf
KonstantinChe [14]

Answer:

B. frost wedging Hope i helped!

Explanation:

5 0
3 years ago
Read 2 more answers
When a horn is moving away from an observer the sound waves from it will pass by the observer____ frequently, causing the pitch
xxMikexx [17]
The answer: less frequency, causing the pitch to be lowered. 

This is known as the Doppler effect. When you have an object that is producing sound while moving, the side that it is moving towards to will have waves that will become a bit more squished together, while the other side that it is moving away from will have waves that are spaced a bit more apart from each other. The only determining factor in this is the magnitude of the speed, so the faster the object is moving towards or away from you, then the more severe pitch change the object will have.
In this case, it's just asking in general what would happen if the horn was moving away from you while it was giving off sound waves. Therefore, since it is moving away from you, its sound waves are a bit further apart, resulting in a lowered frequency and pitch.
8 0
3 years ago
A 115.0-g sample of oxygen was produced by heating 400.0 g of potassium chlorate.2KClO3 Right arrow. 2KCI + 3O2What is the perce
STALIN [3.7K]

Answer:

73.4% is the percent yield

Explanation:

2KClO₃ →  2KCl  + 3O₂

This is a decomposition reaction, where 2 moles of potassium chlorate decompose to 2 moles of potassium chloride and 3 moles of oxygen.

We determine the moles of salt: 400 g . 1. mol /122.5g= 3.26 moles of KClO₃

In the theoretical yield of the reaction we say:

2 moles of potassium chlorate can produce 3 moles of oxygen

Therefore, 3.26 moles of salt, may produce (3.26 . 3) /2 = 4.89 moles of O₂

The mass of produced oxygen is: 4.89 mol . 32 g /1mol = 156.6g

But, we have produced 115 g. Let's determine the percent yield of reaction

Percent yield = (Produced yield/Theoretical yield) . 100

(115g / 156.6g) . 100 = 73.4 %

5 0
3 years ago
A 2.0 mol ideal gas system is maintained at a constant volume of 4.0 L. If 100 J of heat is added, what is the work done on the
LuckyWell [14K]

Answer:

Work done on the system is zero , hence no work is done since the process is <u>isochoric.</u> There is no work done if the volume remains unchanged. (Though the temperature rises, work is only accomplished when the volume of the gas changes.)

Explanation:

ISOCHORIC PROCESS - An isochoric process, also known as a constant-volume process, isovolumetric process, or isometric process, is a thermodynamic process in which the volume of the closed system undergoing the process remains constant through the process. The heating or cooling of the contents of a sealed, inelastic container is an example of an isochoric process. The thermodynamic process is the addition or removal of heat, the closed system is established by the isolation of the contents of the container, and the constant-volume condition is imposed by the container's inability to deform. It should be a quasi-static isochoric process in this case.

<u>Hence , the work done in the system is zero.</u>

7 0
3 years ago
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