Q: Q: What kind of a reaction occurs when a substance reacts quickly with oxygen? Choices: - invention reaction - Fluid Reaction - nitrogen reaction - combustion reaction A:
A: combustion reaction

Q: Q: Fluoride ion is widely used in water supplies to help prevent what? Choices: - rust - bacteria - chlorine taste - tooth decay A:
A: tooth decay

Q: Q: In a ketone, two of which kind of groups are attached to the carbonyl carbon atom? Choices: - ions - nitrogen groups - oxygen groups - carbon groups A:
A: carbon groups

Q: Q: What makes monotremes different than other mammals? Choices: - they lack backbones - they spawn - they reproduce asexually - they lay eggs A:
A: they lay eggs