If you forget to dry off a bread knife and when you washed it and reddish brown spots appeared on it would that be physical or chemical change

Jose and eric were given four samples in lab. the results of their analysis are shown in the table. based on the data they collected, which sample is most likely a metal?

Condensation happens when water vapor cools. true or false? ?

What is the approximate mass of 25 cm3 of silver, if the density is 10.5 g/cm3? a. 0.42 g b. 2.4 g c. 42 g d. 260 g