Which of the following is a physical property of water? It.

A. Reacts with iron to form rust.

B. Breaks apart when electricity is added.

C. It is a liquid at room temperature.

D. Reacts with many different substances.

C. It is a liquid at room temperature.

Explanation:

The state of matter is a physical property, and the other three answers are chemical properties because they change the water molecules themselves. Physical properties do not, therefore C.

answer: at 24 february, 2014 the population gets twice of its initial population.

explanation:

since we have given that

the population for alpha city, t years after january 1, 2004 is given as

first we find out the initial population, i.e. t=0,

so, our quadratic equation becomes,

according to question, we have said that if the population has twice its initial population, then it becomes

so, time taken to reach this above mentioned population is given by

now, we know that time can't be negative so, we take t=9.149 years.

hence, at 24 february, 2014 the population gets twice of its initial population.