All of the following are examples of chemical properties except all of the following are examples of chemical properties except the rusting of an iron nail left out in the rain. the ability of a drain opener to unclog a drain using sodium hydroxide. the low ph of stomach acid. heat being given off by the burning of natural gas in a kitchen stove. chlorophyll being responsible for the green color of leaves.

Option (d) is the correct answer.

Explanation:

A property that does not bring any change in chemical composition of a substance are known as physical properties.

For example, shape, size, mass, volume, density, etc of a substance are all physical properties.

Also, chlorophyll being responsible for the green color of leaves is a physical property because occurrence of green color in plants is due to physical spectra which is a physical property.

Whereas a property that changes chemical composition of a substance is known as chemical property.

For example, precipitation, reactivity, toxicity etc are chemical property.

A chemical change cannot be reverted back. So, rusting of iron nail, ability of a drain opener to unclog a drain using sodium hydroxide, the low pH of stomach acid, heat being given off by the burning of natural gas in a kitchen stove are all chemical changes.

Thus, we can conclude that all of the following given statements are examples of chemical properties except change chlorophyll being responsible for the green color of leaves.

part 1: the half-life of the element is 22 years.

part 2: it will take 132.02 year for the sample to decay from 308.0 g to 4.8125 g.

explanation:

part 1: there are two ways to determine the half life time.

first way: the half life time can be determined directly from its definition as it is the time required for the sample to decay to its half concentration.

from the data the initial concentration was 45.0 g and decayed to its half value (22.5 g) in 22.0 years.

second way: the radio active decay is considered first order reaction so we can use the laws of first order reactions.

k = (1/t) ln (a/a-x), where k is the rate constant of the reaction,

t is the time of the reaction

a is the initial concentration of the reactant

a-x is the remaining concentration at time (t)

a = 45.0 g the initial concentration at t = 0 year.

at t = 22 year, a-x = 22.5 g

then k = (1/22 year) ln (45.0 g/ 22.5 g) = 0.0315 year-1.

the half-life time (t1/2) = ln 2/ k = 0.693/ k =0.693/ 0.0315 = 22 years.

part 2:

using the same law k = (1/t) ln (a/a-x),

using the given data; a = 308.0 g and a-x = 4.8125 g and the calculated k from the part 1 (k = 0.0315 year-1)

t = (1/k) ln (a/a-x) = (1/0.0315) ln (308.0/ 4.8125) = 132.02 years

yes

explanation:

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