Chemical Properties and Reactions

Mr. Paige presents a final lesson for fifth graders on elements and compounds, covering their properties, atomic structure, and the periodic table. The lesson explains how elements form compounds through chemical reactions, with examples like water and salt. It also discusses the conservation of matter and mass, emphasizing that matter is neither created nor destroyed in reactions. The lesson concludes with encouragement for students to continue learning over the summer.

What percentage of the atmosphere is made up of oxygen?

• 1%

• 21%

• 50%

• 78%

Which of the following is a non-metal gas?

• Sodium

• Hydrogen

• Iron

• Nickel

Which of the following is a metal?

• Chlorine

• Oxygen

• Sodium

• Carbon

What is the atomic number of iron?

• 26

• 28

• 56

• 30

How many neutrons does carbon have?

• 14

• 8

• 12

• 6

Which of the following is a compound?

• Iron

• Water

• Hydrogen

• Oxygen

What are the reactants in the process of photosynthesis?

• Water and Salt

• Carbon Dioxide and Water

• Glucose and Oxygen

• Oxygen and Hydrogen

What is the result of a chemical reaction between sodium and chlorine?

• Oxygen

• Glucose

• Salt

• Water

What is the principle of conservation of matter?

• Energy is neither created nor destroyed

• Matter is neither created nor destroyed

• Matter can be created and destroyed

• Mass can be created and destroyed

What happens to the mass of wood when it burns?

• It disappears

• It remains the same

• It decreases

• It increases