Commonly confused words quiz Grade 8

📚 Quick Study Guide

• ⚛️ Atom vs. Ion: An atom is the basic unit of matter consisting of protons, neutrons, and electrons. It's electrically neutral. An ion is an atom or molecule that has gained or lost electrons, giving it a net electrical charge.
• ⚖️ Mass vs. Weight: Mass is the amount of matter in an object and is constant. Weight is the force of gravity acting on that mass and can vary depending on the gravitational field.
• 🧪 Solute vs. Solvent: A solute is the substance that is dissolved in a solution (e.g., sugar). A solvent is the substance that dissolves the solute (e.g., water).
• 🔥 Exothermic vs. Endothermic: An exothermic reaction releases heat into the surroundings, causing the temperature to rise. An endothermic reaction absorbs heat from the surroundings, causing the temperature to drop.
• 💧 Hydrophilic vs. Hydrophobic: Hydrophilic substances are attracted to water (water-loving), while hydrophobic substances repel water (water-fearing).
• 🌡️ Heat vs. Temperature: Heat is the total energy of molecular motion in a substance. Temperature is the measure of the average energy of molecular motion in a substance.
• ⚡ Electronegativity vs. Electron Affinity: Electronegativity is the ability of an atom to attract electrons in a chemical bond. Electron affinity is the change in energy when an electron is added to a neutral atom to form a negative ion.

Practice Quiz

1. What is the term for an atom that has gained or lost electrons?
   1. Atom
   2. Molecule
   3. Ion
   4. Isotope
2. Which of the following describes the amount of matter in an object?
   1. Volume
   2. Weight
   3. Mass
   4. Density
3. In a solution of saltwater, what is the water considered?
   1. Solute
   2. Solvent
   3. Suspension
   4. Compound
4. Which type of reaction releases heat into the surroundings?
   1. Endothermic
   2. Isothermic
   3. Exothermic
   4. Adiabatic
5. What term describes a substance that repels water?
   1. Hydrophilic
   2. Hydrophobic
   3. Amphipathic
   4. Polar
6. What is the measure of the average kinetic energy of the particles in a substance?
   1. Heat
   2. Temperature
   3. Enthalpy
   4. Entropy
7. Which term refers to the ability of an atom to attract electrons in a chemical bond?
   1. Ionization Energy
   2. Electron Affinity
   3. Electronegativity
   4. Atomic Radius