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
Troyanec [42]
3 years ago
10

HELP PLZZZZ plz A PLZ plz

Chemistry
1 answer:
natta225 [31]3 years ago
3 0
It got its layer from over time from wind and dust and buildup of dirt
You might be interested in
In the ground state, an atom of which element has two valence electrons?
Akimi4 [234]
I would say Ni so yeah thats ur answer


5 0
3 years ago
Read 2 more answers
The weather report says that if the temperature drops 10°, it will reach 25° below zero. The current temperature T can be found
Neporo4naja [7]

Answer:

The current temperature is -15° (15° below zero)

Explanation:

The temperature drops 10°:

T-10°

It will reach 25° below zero:

T - 10° = -25°

We add 10° in both members of the equation:

T - 10° +10° = -25° +10°

The equation is simplified as follows:

T = -25° +10°

T = -15°

The integer -15° can be expressed as 15° below zero.

8 0
2 years ago
How much heat in kj is released by burning 9.5 grams of methane?
tatyana61 [14]
Methane is the compound CH4, and burning it uses the reaction:

CH4 + O2 -> CO2 + H2O, which is rather exothermic. To find the heat released by burning a certain amount of the substance, you should look at the bond enthalpy of each compound, and then compare the values before and after the reaction. In methane, there are 4 C-H bonds, which have bond energy of 416 kj/mol, resulting in a total bond energy of 1664 kj/mol. O2 is 494 kj/mol. Therefore we have a total of 2080 kj/mol on the left side. On the right side we have CO2, which has 2 C=O bonds, each at 799 kj/mol each, resulting in 1598 kj/mol, and H2O has 2 O-H bonds, at 459kj/mol each, resulting in a total of 2516 kj/mol on the right hand side. Now, this may be confusing because the left hand side seems to have less heat than the right, but you just need to remember: making minus breaking, which results in a total change of 436kj/mol heat evolved.

Now it is a simple matter of find the mols of CH4 reacted, using n=m/mr.

n = 9.5/16.042 = 0.592195 mol

Therefore, if we reacted 0.592195 mol, and we produced 436 kj for one mol, the total amount of energy evolved was 436*<span>0.592195 kj, or 258.197 kj.</span>
7 0
3 years ago
Select the word or phrase that best completes each of the following sentences.
harina [27]

Answer:

1. Cells

2. Molecules

3. Organ

3 0
2 years ago
Read 2 more answers
A certain plant requires moisture oxygen carbon dioxide light and minerals in order to survive.This statement describes a living
TEA [102]
The Answer is C. Abiotic Factors
3 0
2 years ago
Other questions:
  • CAN SOMEONE PLEASE WRITE ME SHORT STORY FOR THIS. I'LL GIVE YOU BRAINLIEST. I PROMISE. 98 POINTS
    6·1 answer
  • At 100 degrees celsius, the vapor pressures for water, methanol, and ethanol are 760, 2625, and 1694 torr, respectively. which c
    12·1 answer
  • HHHHEEELLLPPPP PLZ ANd thanks mfs .
    14·1 answer
  • Bacteria and fungi break down organisms into nutrients. They are known as
    10·1 answer
  • Which atom is involved in giving your heat energy to beat
    13·1 answer
  • Why is it important to classify living organisms? The DNA of organisms may be more easily analyzed. Organisms may survive longer
    11·2 answers
  • Which property of metals is the result of light reflecting off the electrons?
    14·1 answer
  • Data and evidence are interchangeable in science. True or false?
    14·1 answer
  • Report accidents to your teacher,no matter how they may seem
    14·1 answer
  • Calculate the molality of a solution containing 15.01 g of glycerol (c 3h 8o 3) in 42.3 g of ethanol (c 2h 5oh).
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!