Grade 3 oral presentations quiz

🧪 Quick Study Guide

• ⚛️ An atom is the smallest unit of matter that retains an element's chemical identity.
• 💧 A molecule is a group of two or more atoms held together by chemical bonds. For example, water ($H_2O$) is a molecule.
• 🤝 Elements combine to form compounds. Salt (NaCl) is a compound made of sodium and chlorine.
• 🧱 Matter exists in three common states: solid, liquid, and gas.
• 🌡️ Heating or cooling a substance can change its state (e.g., ice melting into water).
• 🔬 A mixture is a substance made by combining two or more different materials in such a way that no chemical reaction occurs.
• ✨ Some mixtures are solutions, where one substance dissolves into another (like sugar in water).

Practice Quiz

1. What is the smallest unit of matter called?
   1. Atom
   2. Molecule
   3. Compound
   4. Mixture
2. Water ($H_2O$) is an example of a:
   1. Atom
   2. Molecule
   3. Element
   4. Mixture
3. Salt (NaCl) is a:
   1. Element
   2. Atom
   3. Compound
   4. Mixture
4. Which of these is NOT a common state of matter?
   1. Solid
   2. Liquid
   3. Gas
   4. Plasma
5. What happens when you heat ice?
   1. It turns into gas.
   2. It turns into water.
   3. It turns into salt.
   4. It disappears.
6. Sugar dissolved in water is an example of a:
   1. Compound
   2. Element
   3. Solution
   4. Solid
7. What do you call something that is made by mixing multiple things together, but doesn't cause a chemical reaction?
   1. A molecule
   2. A compound
   3. A solution
   4. A mixture