Answer: С
. The temperature increases by about 12°C and then decreases by about 12°C.
Explanation:
Temperatures around the world have been on the rise since the Industrial revolution as humans clog the planet with Carbon Dioxide and other pollutants. This had led to a rise in temperatures that has seen ice levels fall and sea levels rise around the world.
Temperature fluctuations on the other hand are not a new thing. Studies show that in Antarctica temperatures from about 440,000 years ago to about 340,000 years ago increased by 12°C and then decreased by about 12°C.
Answer: 
Explanation: Because barium is in Group 2, it forms ions with a charge of +2. Fluorine, in Group 17, form ions with a charge of -1. Cross the charges to get the subscripts (Since Ba has a charge of +2, F has a subscript of 2. Because F has a charge of -1, Ba needs a subscript of 1). Therefore, a formula unit of the compound is .
Answer:
The correct option is option E
Addition to the carbonyl by a nucleophile is followed by loss of the leaving group.
Explanation:
Substitution reaction that involves nucleophile and acyl group is called nucleophilic acyl substitution reaction.
Generally alcohol, amine or enolate group act as nuceophile. The nucleophile displaces the acyl group of acyl haide, anhydride or ester.
Mechanism of acyl substitution reaction
First step is the addition of nucleophile to the carbonyl carbon results in the formation of a tetrahedral derivatives.
Second step is the removal of leaving group
Hence, the correct option is option E
Answer:
The molecules are held closely together in a regular pattern called a lattice. If the ice is heated, the energy of the molecules increases. ... This is why liquid water is able to flow: the molecules have greater freedom to move than they had in the solid lattice.
Explanation:
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