Answer:
Explanation: The lowest pressure in a laboratory is 4.0×10^-11Pa
Using Ideal gas equation
PV = nRT
P= 4.0×10^-11Pa
V= 0.020m^3
T= 20+273= 293k
n=number of moles = m/A
Where m is the number of molecules and A is the Avogradro's number=6.02×10²³/mol
R=8.314J/(mol × K)
PV= m/A(RT)
4.0×10^-11 ×0.020 = m/6.02×10²³(8.314×293)
m = 4.0×10^-11×0.020×6.02×10^23 / (8.314×293)
m = 1.98×10^8 molecules
Therefore,the number of molecules is 1.98×10^8
Answer:
The energy can be used in a redox reaction
Explanation:
When electrons in photopigments become excited, what is the result of the energy input?
The energy can be used in a redox reaction. The energy can be transferred to a nearby pigment. They can cause fluorescence or heat emission
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Answer:
HCl 1.Polar 2.soluble highly
O2 1.non-polar 2.highly soluble
CaCl2 1.Ionic 2.insoluble
N2 1.non polar 2.soluble highly
C2h6 1.non polar 2.insoluble
KNO3 1.ionic 2.Soluble
Answer:
One significant difference between gases and liquids is that <u>a gas expands to fill its container.</u>
Explanation:
One of the biggest differences between liquids and gases is that liquids have a defined volume and gases do not. A gas has no defined shape or volume, it acquires the shape and volume of the container in which it is located. It is the tendency of gases to increase in volume due to the force of repulsion that works between their molecules.
53 neutrons
53 - 127=74 protons/electrons
