Answer: Here are some examples
Explanation:
1. In the southern spring, ozone is destroyed above Antarctica, mainly by manufactured compounds called chlorofluorocarbons (CFCs )
2. It is now generally accepted that the loss of stratospheric ozone is caused by chemical reactions initiated by chlorofluorocarbons.
3. Your refrigerator and other home appliances emit Chlorofluorocarbons, or CFCs, as do aerosol spray cans.
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Answer:
# The simpliest is: H-H
# All gases formed by elements of the 7th group in the periodic table:
F-F, Cl-Cl, Br-Br, I-I
# In general, Covalent bonds formed between atoms of the same kind are usually non-polar.
Explanation:
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I think the answer is B. Because
Calcium carbonate (), an insoluble precipitate that could be removed from water by filtration, is created when the calcium ion in hard water bonds with the carbonate ion.
Precipitates may be ionic solids that are insoluble and result from reactions between certain cations as well as anions in water. A precipitate's formation could be influenced by a variety of circumstances.
When calcium atoms gain or lose electrons, they change their charge but also reactivity, forming calcium ions.
Therefore, Calcium carbonate (), could be used to precipitate the calcium ion form a water sample
To know more about calcium ion and precipitate
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