Chemistry 8 Lesson 9: Chemical Formulas
1. Summary of theory
1.1. The chemical formula of the element
a. Metallic element
b. Non-metallic element
1.2. The chemical formula of the compound
1.3. Meaning of chemical formula
2. Illustrated exercise
2.1. Form 1: Distinguishing elements and compounds
Lesson 1: State which is a metal element and a non-metallic element in the following substances: Al, O2, O3, Cu, FEMALE2, Mg, H2,
2.2. Form 2: Write chemical formula, meaning of chemical formula
Lesson 1: Write the chemical formula of:
Lesson 2: Give the meaning of the following chemical formula: Chlorine gas (Cl2)
3.1. Essay exercises
Question 1: From the chemical formula of CuSO4 What can be inferred?
Verse 2: Write the formula and calculate the molecular mass of the compound that has 1 Na atom, 1 N atom and 3 oxygen atoms in the molecule?
Question 3: For metal M to form compound MSO4 .Know that the molecular weight is 120. Determine the metal M?
Verse 4: 3 HOURS2What does O mean?
Question 5: What is the meaning of the chemical formula?
3.2. Multiple choice exercises
Question 1: Choose the best chemical formula
Verse 2: The correct chemical formula
A. Potassium sulfuro KCl
B. Calcium carbide CaH
C. Carbon dioxide CO2
D. Methane gas ONLY4
Question 3: Choose the wrong answer
A. CO is carbon oxide
B. Ca is the chemical formula of calcium
C. Al2O3 There are 2 aluminum atoms and 2 oxygen atoms in the molecule
D. All answers
Verse 4: Choose the wrong answer
A. The chemical formula of a single element only includes the chemical symbol for one element
B. Sulfur has the chemical formula S2
C. Molecular Mass of CaCO3 is 100 dong
D. All answers
Question 5: Choose the correct answer
A. The chemical formula of copper is Cu
B. 3 oxygen molecules are O3
C. CaCO3 Made of 2 elements Calcium and 1 element of oxygen
D. All the answers above