List 4 clues that a chemical reaction is occurring

How are heterogeneous mixtures and solutions different?

The Doppler effect is used in: A) Producing energy and predicting floods B) Locating missing cell phones and growing plants C) Identifying areas of rain and identifying speeding cars D) Curing some illnesses and observing subatomic particles

Combustion of 6.90g of this compound produced 13.8g of CO2 and 5.64g of H2O. What is the empirical formula of the unknown compound?

If the [H+] of a solution is 1.0 x 10 to the power of - 2 mol/L the pH is: (pH = - log (H+] 1 12 -2 2 chemistry

True or false. The only elements that can be used as fuel in a nuclear power plant are those in which a chain reaction can occur.

How are electromagnetic different than all other waves

Find the ratio of speeds of an electron and a negative hydrogen ion (one having an extra electron) accelerated through the same voltage, assuming non-relativistic final speeds. Take the mass of the hydrogen ion to be 1.67*10^{-27} kg.

A type of rock that undergoes changes because of heat and pressure

How many milliliters of a 1.25 molar HCL solution would be needed to react completely with 60 g of calcium metal Ca+2HCl - - > CaCl2 + H2

What mass of copper is required to replace silver from 4. oog ogre silver nitrate dissolved in water