input with options: Q: What energy, produced by vibrations, cannot travel through empty space? A:
OPTIONS:
- light
- heat
- plasma
- sound
output: sound

Q: Q: What is the the force of attraction that holds together ions? A:

OPTIONS:
- covalent bond
- soluble bond
- magnetic bond
- ionic bond

A: ionic bond

input: OPTIONS:
- primary nervous system
- active nervous system
- large nervous system
- central nervous system Now, answer this question: Q: The brain and spinal cord are part of what system, which serves as a control center? A:
A:
output: central nervous system

Q: How does litmus paper indicate the ph value of a solution? A:

OPTIONS:
- by texture
- by shape
- by smell
- by color

Answer: by color

Problem: OPTIONS:
- electron shell
- mixture
- gas
- solid
Q: Q: When an ionic compound dissociates in water, water molecules surround each ion and separate it from the rest of the what? A:
Answer: solid

Q: What is measured by the intensity of the sound waves? A:

OPTIONS:
- inputs
- tone
- pitch
- loudness

Answer:
loudness