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
lesantik [10]
3 years ago
14

N which changes of state do atoms lose energy? Check all that apply.

Chemistry
1 answer:
Alex73 [517]3 years ago
3 0
When liquid state is being converted to solid state, atoms come closer to each other and their speed of movement also decreases. Instead of moving about in the substance, they are only able to vibrate about their positions in solid. Hence, this change leads to loss of energy. Similarly, atoms loose energy when state changes from gas to liquid. 
You might be interested in
A compound is found to contain 38.65 % carbon, 16.25 % hydrogen, and 45.09 % nitrogen by mass. what is the empirical formula for
iren [92.7K]

The molar mass of carbon is 12, hydrogen is 1, and nitrogen is 14, hence the ratio are:

 

C = 38.65 / 12 = 3.22

H = 16.25 / 1 = 16.25

N = 45.09 / 14 = 3.22

 

Divide the three by the lowest ratio which is 3.22:

 

C = 3.22 / 3.22 = 1

H = 16.25 / 3.22 = 5

N = 3.22 / 3.22 = 1

 

So the empirical formula is:

CHN

5 0
3 years ago
For the following reaction, 4.21 grams of hydrogen gas are allowed to react with 10.6 grams of ethylene (C2H4) . hydrogen(g) + e
sergiy2304 [10]

Answer:a)  11.34 g of ethane (C_2H_6) can be formed

b) C_2H_4 is the limiting reagent

c) 3.44 g of the excess reagent remains after the reaction is complete

Explanation:

To calculate the moles :

\text{Moles of solute}=\frac{\text{given mass}}\times{\text{Molar Mass}}    

1. \text{Moles of} H_2=\frac{4.21}{2}=2.10moles

2. \text{Moles of} C_2H_4=\frac{10.6}{28}=0.378moles

H_2(g)+C_2H_4(g)\rightarrow C_2H_6(g)

According to stoichiometry :

1 mole of C_2H_4 require 1 mole of H_2

Thus 0.378 moles of C_2H_4 will require=\frac{1}{1}\times 0.378=0.378moles  of H_2

Thus C_2H_4 is the limiting reagent as it limits the formation of product and H_2 is the excess reagent.

moles of H_2 left = (2.10-0.378) = 1.72 moles

mass of H_2 left=moles\times {\text {Molar mass}}=1.72moles\times 2g/mol=3.44g

According to stoichiometry :

As 1 mole of C_2H_4 give = 1 mole of C_2H_6

Thus 0.378 moles of C_2H_4 give =\frac{1}{1}\times 0.378=0.378moles  of C_2H_6

Mass of C_2H_6=moles\times {\text {Molar mass}}=0.378moles\times 30g/mol=11.34g

Thus 11.34 g of ethane is formed.

4 0
3 years ago
Outline the two main observations that led Wegener to propose the theory of continental drift. (in ur own words)
Reil [10]

Answer:

Due to the known fact that certain animal ect lived on certain country/continents due to climate water type ect when fossils of various animal where found in unusual parts of the earth the theory came that all the continent where joined together due to fossil and rock types being found on continents in which would be impossible to reach if not joined together in the beginning

Explanation:

I

3 0
3 years ago
3) Which elements occur diatomically?​
never [62]

Answer: Diatomic elements are pure elements that form molecules consisting of two atoms bonded together.

There are seven diatomic elements: hydrogen, nitrogen, oxygen, fluorine, chlorine, iodine, bromine.

Explanation:

5 0
3 years ago
How many atoms of phosphorus are in 4.90 mol of copper(II) phosphate?
Nutka1998 [239]
There are  6.02214*10^23 molecules , I'm not so sure about it though.
8 0
3 years ago
Other questions:
  • What mean mikroorganism
    9·1 answer
  • . When it comes to calculating slope, what does this image represent?
    15·1 answer
  • A planet's orbital radius is related to its period is also known as
    8·2 answers
  • What do you call the ability of a gas to completely spread out and mix with other substances?
    7·2 answers
  • Question 12 A chemistry student must write down in her lab notebook the concentration of a solution of sodium thiosulfate. The c
    13·1 answer
  • What role do the nafion resin and h3po4 play? could you use concentrated hcl or h2so4 instead?
    10·1 answer
  • 1. How many moles of hydrogen are needed to completely react with two moles of nitrogen?
    13·1 answer
  • Using your own words whats the difference between weather and climate ​
    11·1 answer
  • Conservation of mass to balance the following reaction. Na2S+ KI= NaI+ K2S
    9·1 answer
  • Balance this equation-<br> __P4+ __02 --&gt; __P2O3
    15·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!