When water is added to baking powder the mixture steadily ‘bubbles’. which of the following is most likely to account for such an observation? a. trapped air in the powder is released b. baking powder contains an acid and a carbonate that react together c. baking powder contains an acid and a metal that react together d. water is decomposed by the powder

what is the average time it took the car to travel 0.25 meters?

⇒ 2.23 seconds

what is the average time it took the car to travel 0.50 meters?

⇒ 3.13 seconds

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.

d : a person who learns about the world by observing it. no that is not a smiley face

explanation: