Chemistry Exam Review

Which trend applies to all atoms in the periodic table?

• Atomic radius increases as the atomic number increases

• Atomic radius decreases as the atomic number increases within a single period

• Atomic radius decreases as the atomic number increases within a single group

• Atomic radius increases as the atomic number increases within a single period and within a single group

True or false? As the atomic radius of an atom increases, electronegativity increases.

• True

• False

Which of the following best characterizes an ionic bond?

• two elements with the same electronegativity value

• two elements with similar electronegativity values

• two elements with very different electronegativity values

• two elements with electronegativity values that have a difference of about 1.0

Which of the following are empirical formulas?

• C₂H₄O₂

• H₂CO₃

• K₂Cr₂O₇

• C₃H₆O₃N

True or False? When naming molecular compounds, proper prefixes such as di and tri are used on both the first and second element along with the ending "ide"

• True

• False

True or false? When finding the absolute temperature, or temperature in Kelvin, subtract 273.15 from the Celsius temperature.

• True

• False

Which shows the general equation for a neutralization reaction that involves a hydroxide compound?

• Acid + ionic compound (salt) → water + base

• Acid + base → water + ionic compound (salt)

• Water + ionic compound (salt) → acid + base

• Water + base → acid + ionic compound (salt)

You are given a substance with the pH of 4.5. Is this an acidic or basic substance?

• Acidic

• Basic

Which of the following equations shows the general pattern for a synthesis reaction?

• A + B → AB

• AB + CD → AD + CB

• AB → A + B

• AB + C → A + CB

Which of the following represents a decomposition reaction?

• HCl + NaOH → NaCl + H₂O

• Fe + HCl → FeCl₂ + H₂

• 2 NH₃ → N₂ + 3 H₂

• S + O₂ → SO₂