Elements and Compounds at Home

What percentage of gold is found in the narrator's mom's jewelry?

• 75%

• 25%

• 100%

• 50%

Which element is commonly used in electrical wires due to its conductivity?

• Silver

• Copper

• Gold

• Iron

What compound is exhaled by humans and used by plants in photosynthesis?

• Hydrogen

• Nitrogen

• Carbon Dioxide

• Oxygen

Water is composed of which combination of atoms?

• Two hydrogen atoms and one oxygen atom

• One hydrogen atom and two oxygen atoms

• Two oxygen atoms and one hydrogen atom

• Two carbon atoms and one oxygen atom

What elements make up baking soda?

• Sodium, carbon, and nitrogen

• Sodium, hydrogen, carbon, and oxygen

• Carbon, hydrogen, and oxygen

• Sodium, chlorine, and oxygen