Question 1 a sample of 0.255 mole of gas has a volume of 748 ml at 28°c. calculate the pressure of this gas. (r = 0.0821 l ∙ atm / mol ∙ k) 0.784 atm 8.42 atm 0.00842 atm 7.84 * 10-4 atm none of the above

Laws differ from theories because laws do not provide A. a hypothesis B. a description C. an explanation D. a statement

2. How does the direction of your shadow change over the course of a day?

Which may be true for a substance that absorbs energy? The energy decreases the molecular motion but increases the kinetic energy of the substance. The energy increases the molecular motion and the kinetic energy of the substance.

1. A depression in the ground due to a cave collapse or acidic water dissolution of limestone is called a

A sample of water is being heated over a flame. What happens to the water as it is heated? Select one: a. The volume of the water decreases. b. The water undergoes an endothermic reaction. c. The kinetic energy of the water molecules increases. d.

Nuclear fusion is the source of energy for stars. Besides hydrogen, which other element is most likely also common in stars?

Since the early 2000s, careers in the field of genetics have grown at a rapid pace. Which of these is a probable cause for this explosion of available and expanding jobs?

How many litres of 0.215 m NaCl contains 4.30 mol of this salt? Assume this solvent is H2O I'm confused on this question because little m is molality but when I looked this up on google, someone solved the problem assuming it was molarity

How can a neutral atom become a positively-charged particle?

The last column of the periodic table contains the noble gases, elements that do not easily form chemical bonds.