Answer:
The answer to your question is below
Explanation:
1 ) Which of the following is a chemical property.
A. Ability to become magnetic this is wrong, it's a physical property
B. Ability to conduct electricity this is wrong, it's a physical property
C. Ability to conduct heat this is wrong, it's a physical property
D. Ability to react with acid This is the right answer
2 ) You heat two substances, A and B. Both substances change color. When cooled, substance B returns to its original color, but substance A does not. What most likely happened?.
A. Physical change occurred in both substances This is wrong, a physial change only happens in substance B
B. A physical change occurred in substance A, and a chemical change occured in substance B. This is wrong, a physical change occurred in substance B and a chemical change occurred in substance A.
C. A chemical change occurred in substance A, and a physical change occurred in substance B. This is the right answer is exactly what happens
D. A chemical change occurred in both substances This answer is wrong.
3 ) how many grams are in 2.5 pound sample? Express your answer in scientific notation with three significant figures. ( 1 pound= 453.592 grams).
Rule of three
1 pound ------------------- 453.592 g
2.5 pounds --------------- x
x = 2.5(453.592)/1
x = 1133.98 g = 1.13 x 10³ g letter D
is a Lewis acid due to the unfilled valence shell on carbon atom (possessing positive charge) it accepts electron readily.
is not a Lewis acid due to the presence of negative charge which represents that there are electrons available for donation.
is not a Lewis acid due to the presence of lone pair on nitrogen which is easily donated to the acceptors.
is a Lewis acid due to the availability of vacant p-orbital on boron atom.