Q: Minerals that are not pure elements are made of what? Choices: - isotopes - noble gases - metalloids - chemical compounds A:
chemical compounds

Q: What was the first object to form in the solar system? Choices: - earth - moon - jupiter - sun A:
sun

Q: If the frequency of the electromagnetic wave is the same as the natural frequencies of the system, the transfer of what is much more efficient? Choices: - heat - sound - light - energy A:
energy

Q: H2o is the chemical formula for what? Choices: - glass - smog - salt - water A:
water