Q: The number of particles of a substance in a given volume is known as? Choices: - frequency - range - mass - concentration A:
concentration

Q: What two states of matter are included in the category "fluids"? Choices: - solids and gases - bacteria and gases - liquids and soilds - liquids and gases A:
liquids and gases

Q: Q: All combustion reactions are what type of reactions? Choices: - flammable - geothermal - reversible - exothermic A:
A: exothermic

Question: Q: What does the slope of a position-time graph represent? Choices: - trajectory - direction - acceleration - velocity A:
Answer: velocity

*Question*
Q: What type of role does cartilage play in the human skeleton? Choices: - variable - important - life saving - insignificant A:
**Answer**
insignificant

*Question*
Q: What is the distance between the nuclei of two identical atoms bonded together called? Choices: - cycle radius - bond radius - sleep radius - atomic radius A:
**Answer**
atomic radius