grade 2 grammar quiz

📚 Quick Study Guide

• ⚛️ Atoms: The tiny building blocks of everything! They make up all the matter around us.
• 💧 Molecules: When two or more atoms join together, they form a molecule. For example, two hydrogen atoms and one oxygen atom make a water molecule ($H_2O$).
• 🧊 States of Matter: Matter can be a solid (like ice), a liquid (like water), or a gas (like steam).
• 🌡️ Melting and Freezing: Melting is when a solid turns into a liquid. Freezing is when a liquid turns into a solid.
• ✨ Evaporation: When a liquid turns into a gas, it's called evaporation.

🧪 Practice Quiz

1. Which of these is the smallest building block of matter?
   1. Atom
   2. Molecule
   3. Liquid
2. What is formed when two or more atoms join together?
   1. A solid
   2. A molecule
   3. A gas
3. Which state of matter has a fixed shape and volume?
   1. Liquid
   2. Gas
   3. Solid
4. What is it called when a solid turns into a liquid?
   1. Evaporation
   2. Melting
   3. Freezing
5. What is the chemical formula for water?
   1. $CO_2$
   2. $H_2O$
   3. $O_2$
6. What is it called when a liquid turns into a gas?
   1. Freezing
   2. Melting
   3. Evaporation
7. Which of these is an example of a solid?
   1. Water
   2. Ice
   3. Steam