Chemistry Practice Test

  1. Which of the following best describes what chemistry is (circle one statement)? The study of matter and how it changes. The study of explosive reactions. The study of physical changes.
  1. Which of the following cannot be broken down into its parts: sodium chloride (NaCl), sodium (Na), or salt water? Explain your answer.
  1. Which of those above is a compound? Which is a homogeneous mixture?
  1. How do the properties of sodium and chlorine compare the compound that can create: Sodium chloride?
  1. Which of the following mixtures CANNOT be separated with a magnet (circle one): steel filings and sand, iron filings and sand, sulfur and sand?
  1. ______are tiny particles that make up all forms of matter.
  1. Describe protons, neutrons, and electrons in terms of their charge.
  1. Describe protons, neutrons, and electrons in terms of their locations within an atom.
  1. How many protons, neutrons, and electrons make up the most common isotope of sodium (Na)?
  1. Each group in the periodic table has certain properties due to having the same number of ______electrons. These electrons are also responsible for bonding between atoms. The maximum number of these electrons is __.
  1. Why are the masses on the periodic table not whole numbers?
  1. If a magnesium atom loses 2 electrons, then how many valence electrons will it have and what will be its charge?
  1. When opposite charged ions attract, they form an _____bond, while atoms that share electrons form a ______bond. A ______bond is two pairs of shared electrons.
  1. The overall charge of an ionic compound is always ______.
  1. Write the chemical formulas for magnesium nitrate and potassium oxide.
  1. MgCl2 is a chemical ______, and it shows that there are ___ chloride ions for every magnesium ion.
  1. Do ionic or molecular compounds conduct electricity in water and have high melting points? Explain the reason for each property.
  1. A chemical ______occurs when bonds break and new bonds form.
  1. The number of atoms must be the same on both sides of the chemical equation to show that mass is ______because the mass of the reactants is (<, >, or = to) the mass of the products.
  1. In a chemical equation, the ______are on the left side & are present when the reaction begins, while the ______are on the right side of the arrow.
  1. Draw the equation for the following reaction: Sodium (Na) reacts with chlorine gas (Cl2) in a 2:1 ratio produce 2 molecules of sodium chloride (NaCl).
  1. What are 4 ways that the rate of a chemical reaction can be increased?