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1. 11. Which of the following is correctly matc Nitrogen: Element: Nitrous Oxide: Compound Iron: Element: Rust: Compound III. Mercury: Element: Copper: Compound IV. Oxygen: Element: Water: Compound a. 1, II, III, IV b. 1, II, III only C. 1, II, IV only d. I and II only 10. Sodium is a silvery solid that reacts violently with water and chlorine. When they combine to form the compound sodium chloride known as salt, there is a fundamental change in the properties. Salt is often added food when cooking and it is safe to eat. Which of the following statements supports the idea presented? a. b. True to all compounds, they no longer have the properties of the elements that makes them up. True to some compounds, it maintains the properties of the elements that makes them up. C. True in all elements, it maintains its properties even after it combines with other elements. d. True to all elements, they have the properties after they are combined 11. Which of the following is substance compound? a. alloy b. gold c. iron d. silver 12. Which of the following is an element? a. oxygen b. gun powder C. salt d. water
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