ACTIVITY 9. True or False: Write True if the concept is correct and False if it is wrong.
___________1. Heat energy changes the chemical composition of materials to for new product.
___________2. Materials made of stones is easy to burn and produce ash.
___________3. Physical change occurs in the presence of oxygen. ___________4. Rust is the substance formed by iron. Water, carbon dioxide and oxygen.
___________5. Combustible material reacts with heat and oxygen to burn. ___________6. Heat and water is needed for the chemical change of a material.
___________7. Chemical reaction also provide growth in the human body cells. ___________8. Painting the roof can prevent rusting.
___________9. Burning paper is considered as physical change. ___________10. The combination of light and heat is a sign of chemical change may occur in time.
___________1. Heat energy changes the chemical composition of materials to for new product.
___________2. Materials made of stones is easy to burn and produce ash.
___________3. Physical change occurs in the presence of oxygen. ___________4. Rust is the substance formed by iron. Water, carbon dioxide and oxygen.
___________5. Combustible material reacts with heat and oxygen to burn. ___________6. Heat and water is needed for the chemical change of a material.
___________7. Chemical reaction also provide growth in the human body cells. ___________8. Painting the roof can prevent rusting.
___________9. Burning paper is considered as physical change. ___________10. The combination of light and heat is a sign of chemical change may occur in time.
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Answer:
´━☞ 1. True
´━☞2. False
´━☞3. False
´━☞4. True
´━☞5. False
´━☞6. True
´━☞7. True
´━☞8. False
´━☞9. False
´━☞10. True