Question

choose the correct option.

1 . Which of the following is not a characteristic of a chemical reaction?
a. Change of size
b. Change of state
c. Heat absorbed
d. Formation of precipitate

2. The formation of gas bubbles with a sound in a solution is called
a. physical change.
b. effervescence.
c. precipitation
d. chemical reaction.
​

Answer 1

Answer:

1: a

2 : b

Explanation:

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Answer 2

Answer:

change of size, effervescence