(03.05 LC)
Look at the image shown.
H
— Н
What does this image represent?
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Linear molecule with one domain
O Linear molecule with two domains
Tetrahedral molecule with four domains
O Trigonal planar molecule with three domains

answer is: c. the experiment shows that the red substance experienced a chemical change.

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

they are both synthetic elements

explanation:

d

while cooking a piece of 1/2 pound beef steak, a cast iron pan (2.4kg in weight) was heated 260 celsius.