Q: An ether is an organic compound in which two hydrocarbon groups are bonded to the same atom of what? Choices: - hydrogen - sulfur - nitrogen - oxygen A:
oxygen

Q: Colliding-beam accelerators create matter from what? Choices: - magnetism - sound - minerals - energy A:
energy

Q: Q: The formula mass of a covalent compound is also called the what? Choices: - atomic mass - ionic mass - nucleus mass - molecular mass A:
A: molecular mass

Question: Q: What asymmetrical organ has four chambers and, in humans, is about the size of a clenched fist? Choices: - brain - kidney - liver - heart A:
Answer: heart

*Question*
Q: The vertebrae are divided into the cervical region, the thoracic region, and which other region? Choices: - cylindrical region - central region - pelvic region - lumbar region A:
**Answer**
lumbar region

*Question*
Q: What always has the same elements in the same ratio? Choices: - component - cell - mitochondria - compound A:
**Answer**
compound