What makes a compound different from a molecule?

A.

contains 2 or more atoms

B.

held together by chemical bonds

C.

use of chemical symbols

D.

contains 2 or more different elements

Solid in a gas is there a difference between a solid and gas is

Which of the following statements is False about catalyst? a. Catalyst increases the rate of reverse reactions. b. Since the catalyst increases rates of the reaction, equilibrium constant also increases. c.

The atomic number of an element is by counting the number of in an atom

Identify which of the concentration expressions can also be used to describe a solution with a concentration of 1 mg/mL of solute. Assume the density of the solution is 1.00 g/mL

Sodium chloride (NaCl) is the chemical name for table salt and potassium chloride (KCl) is a common salt substitute. Using the periodic table, choose the correct statement about how these compounds form. A.

A 0.239 gram sample of a gas in a 100-mL flask exerts a pressure of 603 mm Hg at 14 degrees Celsius. What is the gas?

Which of the following is true about a redox reaction? In a redox reaction, an electron is lost by the reducing agent. In a redox reaction an electron is lost by the oxidizing agent.

Is the equation above balanced? How do you know? Mg + 2HCl → MgCl2 + H2

What characteristics do atoms of carbon-12, carbon-13, and carbon-14 have in common?

Which of the following changes would decrease the rate at which a solid solute dissolves in a liquid solvent? A. Decreasing pressure B. Decreasing surface area C. Increasing rate of stirring D. Increasing temperature