An unknown gas is likely to be carbon dioxide if it has which of the following
characteristics?
a
turns limewater milky
b. is flammable
c. is less dense than air
d. has a penetrating odor

An unknown gas is likely to be carbon dioxide if it turns limewater milky.

Option a

Calcium Hydroxide also known as lime is a sparingly soluble compound which when dissolved in water produces an alkaline solution known as lime water. When a gas such as carbon dioxide passes through this alkaline solution, it turns lime water milky due to the formation of an insoluble suspension of calcium carbonate . This can be understood by the following chemical reaction-

If an excess amount of gas is added in the solution, the following reaction takes place:

At this stage, the milkiness of the solution disappears since "calcium bicarbonate is soluble in water".

a: 45.9 meters

b: 4.29 seconds

step-by-step explanation:

a: h(t)=1/2(-9.8)(3)^2+0(3)+90

h(t)=-4.9(3)^2+90

h(t)=-44.1+90

h(t)=45.9 meters

b: 0=1/2(-9.8)(t^2)+0t+90

0=-4.9t^2+90

-90=-4.9t^2

18.37=t^2

t=4.29 seconds

in the second question, the numbers aren't exact, but they're a close approximation.

20 drops hope this