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Taya2010 [7]
3 years ago
9

Which change is exothermic?

Chemistry
2 answers:
andre [41]3 years ago
4 0
An exothermic change will be when rain becomes sleet when the temperature falls below 0 degree Celcius. An exothermic change or reaction is a chemical reaction that release energy by light or heat. It is the opposite of an endothermic reaction. Expressed in a chemical equation: Reactants = products +energy. 
lys-0071 [83]3 years ago
4 0

Answer:

Rain becomes sleet when the temperature falls below 0°C.

Explanation:

Energy is released in an exothermic reaction and energy is absorbed in an endothermic reaction.  

Option A is exothermic.  Change of rain to sleet occurs at very low temperatures below 0°C with the release of heat.

Option B is endothermic. As the rising temperature causes heat to be absorbed by the iceberg thus melting them.  

Option C is endothermic. Solid to liquid phase change of water occurs with the absorption of heat energy.  

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Write a summary of the science of muscle growth?
frez [133]

Answer:Muscle growth or “skeletal muscle hypertrophy,” as it's called at science parties) is the result of a complex process that adds more myosin “filaments” to each muscle fiber. This makes the “engine” of the cell bigger and stronger over time. ... This process is called muscle protein synthesis, or MPS. Skeletal muscle is composed of thread-like myofibrils and sarcomeres that form a muscle fiber and are the basic units of contraction. The 650 skeletal muscles in the human body contract when they receive signals from motor neurons, which are triggered from a part of the cell called the sarcoplasmic reticulum.

4 0
3 years ago
The following equations are half reactions and reduction potentials. Ag+ (aq) + e– Ag(s) has a reduction potential of +0.80 V. C
Lady bird [3.3K]

Answer : The correct option is, (A) silver ion gains electrons more easily and is a stronger oxidizing agent than a chromium(III) ion.

Explanation :

The given half reaction are :

1st half reaction : Ag^+(aq)+e^-\rightarrow Ag(s)

The reduction potential of this reaction = +0.80 V

2nd half reaction : Cr^{3}+(aq)+3e^-\rightarrow Cr(s)

The reduction potential of this reaction = -0.74 V

From the reduction potentials, we conclude that the reaction which have positive reduction potential, they will gain electrons more easily and reduced itself and act as a stronger oxidizing agent.

Or we can say that the reaction which have negative reduction potential, they will lose electrons more easily and oxidized itself and act as a stronger reducing agent.

The reduction potential of 1st half reaction is positive and 2nd half reaction is negative.

Therefore, the silver ion gains electrons more easily and is a stronger oxidizing agent than a chromium(III) ion.


5 0
4 years ago
Read 2 more answers
Chlorine has seven valence electrons. It can form a bond with two atoms of Magnesium (two valence electrons). Is this an example
Schach [20]

Answer:

The answer to your question is Ionic bonding. Magnesium loses 2 electrons and Chlorine gains 1 electron

Explanation:

An Ionic bond is formed between a metal and a nonmetal and the difference of electronegativity is higher than 1.7. In this type of bond, metals lose electrons and nonmetals gain them.

Covalent bonding is formed between two nonmetals and the difference of electronegativity is between 0 and 1.7. Elements share electrons.

Process

Electronegativity of Mg = 1.31

Electronegativity of Cl = 3.16

Difference = 3.16 - 1.31

                  = 1.85

          1.85 > 1.7 then the bond formed is Ionic

Magnesium loses 2 electrons and Chlorine gains 1 electron

6 0
3 years ago
A 3.0 M HCl(aq) solution contains a total of
Strike441 [17]
It would be answer 3
8 0
3 years ago
If 4 moles of gas are added to a container that already holds 1 mole of gas, the pressure inside the container _____ due to the
sveticcg [70]

Answer: will be five times higher

If 4 moles of gas are added to a container that already holds 1 mole of gas, the pressure inside the container

will be five times higher due to the change in the amount of gas.

Explanation:

4 moles of gas + 1 mole of gas = 5 moles of gas.

Also, the ideal gas equation pV = nRT

show that pressure is directly proportional to number of moles; so, if 1 mole of gas contains molecules that move randomly and freely under pressure inside the container; addition of 4 extra moles will sum up to 5moles of gas molecules moving randomly under pressure, and that is five times higher as well.

4 0
3 years ago
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