Chemistry Challenge

What is the pH of a solution with a hydrogen ion concentration of 1 x 10^-3 M?

• 6

• 3

• 4

• 5

In a neutralization reaction, what are the products when an acid reacts with a base?

• Heat and light

• Salt and water

• Acid and base

• Gas and solid

Which element is the most electronegative on the periodic table?

• Neon

• Helium

• Oxygen

• Fluorine

How many moles of oxygen are in 2 moles of CO2?

• 4

• 3

• 2

• 5

What is the molecular geometry of a molecule with 4 bonding pairs and 0 lone pairs?

• Trigonal Planar

• Linear

• Octahedral

• Tetrahedral

Define an acid according to the Arrhenius definition.

• A substance that increases the concentration of oxygen in a solution

• A substance that dissociates in water to produce hydrogen ions (H+).

• A substance that releases hydroxide ions (OH-) in water

• A substance that forms salts when reacting with bases

What is the general formula for a combustion reaction?

• O2 + H2O -> CO2 + fuel

• CO2 + H2O -> fuel + O2

• fuel + O2 -> CO2 + H2O

• fuel + O2 -> CO2 + H2O2

What trend does atomic radius follow across a period on the periodic table?

• Atomic radius decreases

• Atomic radius fluctuates

• Atomic radius increases

• Atomic radius remains constant

How many grams of NaCl are in 0.5 moles of NaCl?

• 35.5 grams

• 29.22 grams

• 15.3 grams

• 20.1 grams

What is the pH of a solution with a hydroxide ion concentration of 1 x 10^-10 M?

• 10

• 7

• 8

• 12