Answer: cash crops
Explanation:
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Answer: Cash Crops
Explanation: These crops were used in the south to make loads of money before the civil war in southern plantations so they were known as cash crops
Chemical reactions can be classified based on patterns such as reversibility or irreversibility, changes in chemical structure, and changes in chemical energy. These changes can refer to the reaction direction, molecular rearrangements, and energy transformations.
The criteria for classifying chemical reactions are notable patterns of behavior and include factors such as reversibility or irreversibility, changes in chemical structure, and changes in chemical energy. For instance, reversibility or irreversibility refers to the direction in which the reaction takes place. A reaction may synthesize into a product and then decompose back into the reactants, an instance of reversible reaction.
Changes in chemical structure involve a transformation in the arrangements of atoms in the reactants and the products. For instance, in a chemical reaction involving the transfer of hydrogen ions between reactants, the structure of the molecules changes.
Changes in chemical energy denote transformations involving energy, either by absorption or release, accompanying the reaction process. This is a characteristic feature of exergonic and endergonic reactions. For instance, in an exergonic reaction, energy is released due to the reaction.
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Answer:
Earth's surface
Explanation:
Most abundant green houses gases in earth's atmosphere are:
water vapour, carbon dioxide, nitrous oxide, methane, ozone and chlorofluoro carbon.
Green house gases are required to maintain earth's average temperature.
Without greenhouse gases, the average temperature of Earth's surface may fall to−18 °C.
Green houses gases trap the thermal infrared raditaion emitted from the earth's surface and keep the earth warm in order to sustain life.
So, greenhouse gases absorb radiation from the earth's surface.
Answer:
Different ions of different elements (usually metals) make a flame burn with a characteristic color when introduced into the reaction zone; the different colors are caused by the different quantized energy levels of the electrons in the different atoms.
How many molecules are in 2.47 moles of CC14? *
Answer:An atom has 5 protons, 5 electrons and 6 neutrons The atomic number = number of protons = number of electrons = 5 The mass number = 5 protons + 6 neutrons = 11
The number of valence electrons that a neutral atom of aluminum has is 3 valence electrons.
Valence electrons are those electrons in the outermost parts of elements that can be combined or loned to other elements during chemical reactions. Aluminum has three electrons in the valence shell.
The total number of electrons that aluminum has is 13 and the 3P1 shell has three electrons. So, this is the number of valence electrons.
Learn more about valence electrons here:
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Answer:
Aluminum has 13 electrons in a neutral atom. The 1S2, 2S2 and 2P6 shells are full, and so is the 3S2. The 3P1 shell has one electron in it (in Al's neutral atom) and that gives aluminum one lone valence electron and two "semi-valence" electrons which can be loaned out.
Explanation: