HELP ASAP PLS a 35.0 g block of copper is dropped into 450 grams of water at 21.5 C. The temperature of the water changes to 22.3 C. Does the water's temperature rise or fall?

Which of the following mining methods disrupts the sea floor?

Does the number of ions in solution increase, decrease, or remain constant? it continuously decreases. it continuously increases. it decreases at first, then increases. it increases at first, then decreases.

How can a scientist assess whether a pure niobium (nb) sample is responsible for contaminating the lab with radioactivity? test the niobium sample to see whether it now contains other elements.test the niobium sample for the presence of niobium oxide compounds.heat the niobium, and see if the level of radioactivity in the lab increases.place the niobium under pressure, and see if the level of radioactivity in the lab increases.