Chemical reactions cause changes in:

atoms

molecules

physical properties

Predict the charge that each atom will form carbon (c)

What are 3 physical properties of a log?

How much energy is released when 37.8 g of water freezes? the heat of fusion for water is 6.02 kj/mol. the amount of heat energy released = kj?

An alloy contains 56g of pure silver and 22g of pure copper what is the percentage (%) of silver in the alloy?

What makes some collisions elastic and others inelastic

What did scientists observe using the earliest microscopes

Which statement describes the redox reaction that occurs when an object is electroplated? A. It is spontaneous and requires an electric current. B. It is spontaneous and produces an electric current. C.

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