collaborative discussions quiz grade 7

📚 Quick Study Guide

• ⚛️ Atoms: The basic building blocks of matter. Remember that all matter is made up of atoms!
• 🧪 Elements: Substances made up of only one type of atom (e.g., Hydrogen, Oxygen). You can find them on the periodic table.
• 🤝 Compounds: Substances formed when two or more different elements are chemically bonded together (e.g., Water ($H_2O$), Carbon Dioxide ($CO_2$)).
• ➕ Mixtures: Combinations of two or more substances that are physically combined but not chemically bonded (e.g., Saltwater, Air).
• 🌡️ States of Matter: Solid, Liquid, and Gas. Remember how they change with temperature!
• 🧮 Chemical Formulas: Use symbols to represent the number and type of atoms in a molecule (e.g., $NaCl$ for Sodium Chloride).
• 💡 Key Idea for Discussions: When discussing collaborative experiments, always mention safety precautions, experimental design, and data interpretation!

🧪 Practice Quiz

1. Which of the following is an example of an element?
   1. Water ($H_2O$)
   2. Carbon Dioxide ($CO_2$)
   3. Oxygen ($O_2$)
   4. Salt ($NaCl$)
2. What is formed when two or more elements chemically combine?
   1. A Mixture
   2. An Atom
   3. A Compound
   4. A Solution
3. Which state of matter has a definite volume but no definite shape?
   1. Solid
   2. Liquid
   3. Gas
   4. Plasma
4. What does the chemical formula $CO_2$ represent?
   1. Water
   2. Carbon Monoxide
   3. Carbon Dioxide
   4. Oxygen
5. Which of the following is an example of a mixture?
   1. Hydrogen
   2. Water
   3. Saltwater
   4. Oxygen
6. In collaborative discussions about chemistry experiments, what is one crucial aspect to consider?
   1. The color of the reactants
   2. Safety precautions
   3. The size of the beaker
   4. The time of day
7. Which of the following is the smallest unit of an element that retains the properties of that element?
   1. Molecule
   2. Compound
   3. Atom
   4. Mixture