1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
kipiarov [429]
3 years ago
15

Which process is endothermic?a)b)c)d)The evaporation of water from the skin.The burning of candle wax.The oxidation of iron in a

chemical hand warmer.The combustion of natural gas in a stove
Chemistry
1 answer:
BlackZzzverrR [31]3 years ago
6 0

Answer:

The answer is option a. The evaporation of water from the skin

Explanation:

An endothermic reaction is any synthetic reaction that retains heat from its environment. The ingested energy gives the enactment energy to the reaction to happen.

No new bonds formed, no bonds broken in this example. water molecules go from liquid to vapour (gas ), intermolecular bond exist between polar (-OH) molecules and energy is required to break these bonds during the change from liquid to gas. So, it is endothermic .

Remaining three above examples are exothermic. combustion of gas releases energy(exothermic). burninig of the candle exothermic because the energy released from the oxygen into carbon dioxide and water.oxidation of iron also exothermic

You might be interested in
The equilibrium constant for the gas phase reaction
stellarik [79]
The equilibrium constant is found by [product]/[reactant]

If the equilibrium constant is very small, such as 4.20 * 10^-31, then that means at equilibrium there is very little product and a lot of reactant.
And likewise, if there is a lot of product formed, and very little reactant, then the K value will be very large, which tells us that it is predominantly product.

At equilibrium, for any reaction, there will always be some reactant and some product present. There cannot be zero reactant or zero product. Also keep in mind that the equilibrium constant is dependent on temperature.

At equilibrium, for your reaction, it is predominantly reactants.
6 0
3 years ago
Which statement is true about the patterns shown on the electromagnetic spectrum?
Rudiy27
A. As wavelength increases, radiant energy and frequency increase.
5 0
2 years ago
Why do different molecules require different masses to make 1 mol
Wewaii [24]

Answer:

Different substances have different molecular masses. Thus, equal masses have different numbers of atoms, molecules, or moles. On the other hand, equal numbers of moles of different substances have different masses.

3 0
3 years ago
1. The diagram above shows the repeating groups of atoms that make up two samples. Will the
serious [3.7K]

Answer:

Will likely be the same

Explanation:

We can see in both pictures there is a black molecule and a red molecule. However, we also have a purple molecule in one image and a yellow in the other. It would LIKELY be the same because we have more of the same molecules then more different molecules. Hope this helps

4 0
3 years ago
What state had the fewest farms? Wisconsin Georgia Illinois
rodikova [14]
Georgia had the fewest farms.
4 0
3 years ago
Other questions:
  • Relative formula mass of glucose? (C6H12O6)
    6·1 answer
  • Describe how fuel oil can be changed into gasoline?
    6·1 answer
  • Which of the following is considered applied research?
    15·1 answer
  • the solid above sink to the bottom when you put a container filled with it what does that tell you about density
    14·1 answer
  • A solution of pH 3 was mixed with a solution of pH 9. What is the final pH could be ?
    6·1 answer
  • Eriq, a chemist, is running tests with four unknown elements. He has found that they all bond the same way, so he knows that the
    5·2 answers
  • The following equation shows the equilibrium in an aqueous solution of ammonia: NH3(aq)+H2O(l)⇌NH4+(aq)+OH−(aq)NH3(aq)+H2O(l)⇌NH
    11·1 answer
  • Which of the following laboratory procedures best illustrates the law of conservation of mass?
    7·2 answers
  • An unknown gas diffuses 1.25 times faster than CO2 gas. What is the molar mass of the unknown gas?​
    14·1 answer
  • Read the information about the halogen family.
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!