Question

question 1 (5 points)
reactivity is the ability of a substance to allow heat or electricity to pass through it.
true
false
question 2 (5 points)
a student heads sugar in a pan. the sugar turns brown and gives off a burnt smell. which conclusion is best supported by th
a a physical change has occurred because it can be reversed
b a chemical change has occurs because new substances formed
c a physical change has occurred because it melted
d no change occurred

Explanation:

For Question 1: Reactivity is the ability of a substance to undergo a chemical reaction, not the ability to conduct heat or electricity (which is conductivity).
For Question 2: When sugar turns brown and gives off a burnt smell, new substances are formed. In a chemical change, new substances are produced, while in a physical change, the substance's identity remains the same.

Answer:

Question 1: B. False
Question 2: B. a chemical change has occurs because new substances formed