I think the best answer that will describe chemical change is the first option. During a chemical change, b<span>oth the identity and the properties of a substance change because new substances are being formed by a chemical reaction. An example is rusting of steel</span>
Explanation:
Liquids cannot change volume but gases can because they have a fixed shape like solids.
Liquids have strong intermolecular forces binding their molecules together resulting is fixed ordering.
- Gases are randomized with their molecules haphazardly arranged.
- This allows them to expand spontaneously on their own.
- Molecules of liquids are more tightly packed compared to gases.
- In a liquid, the molecules have a less random pattern of motion and can only slide past one another.
- In a gas, the molecules are in continuous random, straight line motion.
Learn more:
Gases brainly.com/question/7966903
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Answer:
Sodium
(Na)
Just count the electrons and search which atom it is.
Answer:
n = 2.208x10¹⁸ photons
Explanation:
The energy of a photon( an elementary particle) is given by the equation:
E = nxhxf
Where n is the number of photons, h is plank constant (6,62x10⁻³⁴ J.s), and f is the frequency. Knowing that the power level is 0.120mW (1.2x10⁻⁴ W), the energy in J, for a time of 78 min (4680 s)
E = 1.2x10⁻⁴x4680 = 0.5616 J
The frequency of a photon is its velocity ( c= 3x10⁸ m/s) divided by its wavelength, which is 780 nm = 780x10⁻⁹ m
f = 3x10⁸/780x10⁻⁹
f = 3.846x10¹⁴ s⁻¹
Then, the number of photons is:
0.5616 = nx6,62x10⁻³⁴x3.846x10¹⁴
n = 2.208x10¹⁸ photons.
Lichens are an examples of Symbiosis
