Identify some of the signs that has a chemical change has occurred

A sample of a gas has a volume if 852mL at 288K. What temperature did s necessary for the gas to have a volume of 945mL?

Write the symbol for the element which has the smallest atomic radius. c, al, li, ne.

1. Biuret reagent and sodium hydroxide are added to a 2 mL sample of an unknown solution. After some time, the sample displays a light blue color (the same as the original reagent). In terms of macromolecules, what do these results indicate?

Calculate the number of moles of zinc that contain 4.50 x 1024 atoms?

How many grams of oxygen are in 56 g of c2h2o2?

The most important reason why solid sodium hydroxide is not used as a primary standard is

plate a and plate b are both continental plates. what is ghe most likely result if the two plates collide?

According to the second law of thermodynamics, the entropy of any system always increases. According to the second law of thermodynamics, the entropy of any system always increases. True False

If the density of Cu is 8.96g/cm cubed, what is the volume of 28kg of Cu?

A piece of iron can change in different ways. How is iron bending different from iron rusting?