The shape of which the pebble sized particles that makes up the rock is more of a rounded shape as they are bits and in circular formation, depicting it to be more rounder in which are particles that is made up in a rock. They can be in pebble sized or much more smaller than that when in bits.
Explanation:
Coal and natural gases are fossil fuels that are found in geologic formation. They both form under similar environment of high temperature and pressure which transforms organic matter.
Natural gas is a fluid and coal is a solid.
How did they form differently?
- Natural and gas and petroleum are both derived from an organic matter rich in both plant and animal remains.
- Coal is typically derived from organic matter that is rich in only plant remains usually formed in swampy area.
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Answer:
For pipes that play low-frequency notes, the advantage of using a tube which is open at both ends is that it produces sound whose wavelength is just twice the length of the tube but a tube which is open at one end and closed at the other produces sound with a wavelength equal to four times the length of the tube.
Therefore the tube which is open at both ends more suitable for low frequency note.
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14. Reactants:
Magnesium Chloride:
, since magnesium (Mg) has 2 valence electrons while chlorine (Cl) has 1 vacancy, so they are in ratio 1:2
Sodium oxide:
, since sodium (Na) has 1 valence electron while oxygen (O) has 2 vacancies, so they are in ratio 2:1
15. Products:
Magnesium oxide:
, since magnesium (Mg) has 2 valence electrons and oxygen (O) has 2 vacancies, so they are in ratio 1:1
Sodium chloride:
, since sodium (Na) has 1 valence electron and chlorine (Cl) has 1 vacancy, so they are in ratio 1:1
16: Balanced reaction:

we see that on the reactant side we have: 1 atom of Mg, 2 atoms of Cl, 2 atoms of Na and 1 atom of O. By putting a 2 in front of NaCl, we have exactly the same on the product side: 1 atom of Mg, 2 atoms of Cl, 2 atoms of Na and 1 atom of O.
17. It is a double-replacement reaction
A double-replacement reaction occurs when two ionic compounds exchange their ions. In this specific case, we see that the Chlorine (initially bond with the magnesium) is then bond with the sodium, while the oxygen (initially bond with the sodium) after the reaction is bond with the magnesium.