How do substances that are not soluble react when mixed with water?
They change color and dissolve partially.
They remain unchanged and do not mix with the water.
They dissolve completely, forming a clear solution.
They react with water to form a new substance.
What physical properties do most metals have in common?
They can be shaped, stretched, and let heat and electricity pass through.
They are see-through and very light.
They are very soft and melt quickly.
They break easily and don't let electricity pass through.
A student has four substances. How can the student determine which substance has the greatest density?
By measuring how much space each one takes up.
By checking which one floats in water.
By seeing which one is the lightest.
By comparing their weights and volumes.