In order to change a solid to a liquid or a liquid to a gas, what is needed?

Electromagnetic waves of various frequencies reach earth from distant parts of the universe. Which of the following can be inferred from this?

When an atom undergoes alpha decay

Action that occurs as two or more objects have an effect upon one another A) Force B) Interaction C) Charged object D) Gravity E) Magnetic

Find the molarity of a solution containing 12 grams of LiOH in 500 milliliters of solution. Select one: a. 2 M b. 0.04 M c. 1 M d. 0.5 M

Which of the following best explains why arginine is more basic than lysine? A. The electron-donating groups around the basic nitrogen on arginine make its conjugate base less stable. B.

An analytical chemist is titrating 242.5 mL of a 1.200 M solution of hydrazoic acid HN3 with a 0.3400 M solution of NaOH. The pKa of hydrazoic acid is 4.72. Calculate the pH of the acid solution after the chemist has added 1006.

A gas stream contains 18.0 mol% hexane and the remainder nitrogen. the stream flows to a condenser, where its temperature is reduced and some of the hexane is liquefied. the hexane mole fraction in the gas stream leaving the condenser is 0.0500.

What type of solution is aerated water. why is it so.

What elements form chemical bonds

Which of the following is not a pseudoscientific claim