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alekssr [168]
3 years ago
6

What percentage of atoms in the entire universe are hydrogen atoms?

Chemistry
1 answer:
lisabon 2012 [21]3 years ago
3 0
The percentage of atoms in the universe that are hydrogen are 90%
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Humans could try to pollinate food crops by hand, but this would be expensive and time consuming. Natural pollinators, like bees
malfutka [58]

B. Regulating Services

Explanation:

Pollination is an example of regulating ecosystem service.

  • Ecosystem services are the direct and indirect contribution to human life.
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  • Regulating services are the values derived from controlling the ecosystem.
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The photo shows a clay pot being made on a spinning potter's wheel. What
sineoko [7]

Answer:B

Explanation:

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2 years ago
chemistry A basketball is inflated to a pressure of 1.10 atm in a 28.0°C garage. What is the pressure of the basketball outside
butalik [34]

Answer : The final pressure of the basketball is, 0.990 atm

Explanation :

Gay-Lussac's Law : It is defined as the pressure of the gas is directly proportional to the temperature of the gas at constant volume and number of moles.

P\propto T

or,

\frac{P_1}{P_2}=\frac{T_1}{T_2}

where,

P_1 = initial pressure = 1.10 atm

P_2 = final pressure = ?

T_1 = initial temperature = 28.0^oC=273+28.0=301.0K

T_2 = initial temperature = -2.00^oC=273+(-2.00)=271.0K

Now put all the given values in the above equation, we get:

\frac{1.10atm}{P_2}=\frac{301.0K}{271.0K}

P_2=0.990atm

Thus, the final pressure of the basketball is, 0.990 atm

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2 years ago
List the names of the elements that make up the molecule?
garik1379 [7]

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Name 2 separate technique in separating iodine crystal and iron filings​
KonstantinChe [14]

One is through sublimation, where the mixture is heated and iodine gets converted into gaseous form, leaving behind the iron fillings.

The other is to get a magnet near the mixture and all the iron fillings get attracted to it while iodine will be left over

5 0
3 years ago
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