List the signs that indicate a chemical change has taken place. What does the presence or absence of these signs tell you about a chemical change?

What is the volume of 80.0 g of ether if the density of ether is 0.70g/ml

In a chemical reaction, there is conservation of

What initially forms as pale blue and pale green precipitate when nh3 is added to cuh2o6?

238u undergoes radioactive decay to 234th. how many protons, electrons, and neutrons are gained or lost by the 238u atom during this process?

Sample with a density of 4.0g/cm^3 and 3.5g, find the volume

The type of nuclear decay an unstable nucleus will undergo depends on its ratio of neutrons to protons. The radioisotope cobalt-65 has a ratio of neutrons to protons of 1.41, which is too high for a nucleus of this size.

1.87 $/gal to dollars per liter, Express your answer using three significant figures.

What can a student do to increase the force of attraction of a magnet on an iron block?

Which elements can react to produce a molecular compound?

Who created the periodic table and in what year?