A student is trying to identify the composition of a pure metal block by determining its density. The student records the mass of the sample to be 25.0 g. The rectangular block is 3.00 cm × 3.00 cm × 1.40 cm. Calculate the density (in g/cm3). Express your answer to the correct number of significant figures.

We are not here to write essays for people. this is something that you decide and share your opinions on yourself. just do some brainstorming and if all else fails just make something up.

4km is the total temerature change between 3 km and 7 km

Answer isno products will be formedyou need the required activation energy/good geometry  to be able to get a reaction going. (without favorable  geometry, more energy would be needed.)this is because molecules in a reaction have electrons surrounding them. as molecules approach one another, they start to slow down because of the like charge repulsion (electrons have a negative charge—like charges repel). the appropriate amount of energy is needed to overcome that mutual repulsion. without that amount of energy, the speed of the molecules will be slowed down to such an extent  they do not even collide; they end up rebounding from each other.