Suppose you want to test if a sample compound is ionic. You have these materials: the solid compound, a glass container, a spoon, and a conductivity apparatus. What material is missing from your list, and why is it necessary?

Which is not true about oxygen-17 and oxygen-18?

This is important 1. what happens to the speed of molecules in water vapor when it condenses to form a liquid? (2 points) the molecules slow down. the molecules speed up. the molecules slow down and then speed up. the molecules speed up and then slow down. 2. how might human activities change to compensate for a decrease in water supplies? (2 points) humans might build a factory. humans might build drainage systems. humans might extract more water from the ground. human behavior does not change because of the water cycle. i'll be grateful if anyone can answer these 2 questions !

Each line (unit) on the horizontal axis represents: 5 years 10 years 20 years all of the above