9. Which of the following is correctly matched? A. Gold: Element: Silver: Compound
B. Oxygen: Element: Water: Compound
C. Sugar: Element: Salt: Compound
D. Water: Element: Hydrogen: Compound

B

Explanation:

Oxygen (O2) is made up of two oxygen atoms but, just of one kind of atom oxygen (O), So it's an element. Water (H2O) is made up of two hydrogen atoms (H) and one oxygen atom (O), so it's a compound

they are made of gases.

they have a spherical shape.

they make energy through fusion.

while cooking a piece of 1/2 pound beef steak, a cast iron pan (2.4kg in weight) was heated 260 celsius.