Need !
what is required to change water from a liquid to a gas?

(a)the addition of energy
(b)a change in the chemical composition
(c)a reduction of the volume of the sample
(d)a reduction of the mass of the sample

Asample of radium-226 will decay 1/4 of its original amount after 3200years. what is the half-life of radium-226?

Sarah wants to know where in her garden chamomile would grow the best. she thinks chamomile will grow best in the corner of the garden that gets the most sunlight. to test her hypothesis, she decides to plant several groups of chamomile in her garden as an experiment. which of the following variables will sarah need to measure to know which group of plants grew best? a. the location of the plants b. the type of plants c. the height of the plants d. the amount of water she gives the plants

Using the first volume and temperature reading on the table as v1 and t1, solve for the unknown values in the table below. remember to use the rules of significant figures when entering your numeric response.