One of your chores is to mow the lawn. The lawnmower runs on gasoline. The gasoline burning is a
and the grass being cut is a
A. physical change, chemical change
OB. chemical change, physical change
C. physical change, physical property
OD chemical property, physical change

The covalent compound acetylene, which is the fuel of the oxyacetylene torch used by welders, has the molecular formula c2h2. the covalent compound benzene, a commercial solvent, has the molecular formula c6h6 each of these covalent compounds contains carbon and hydrogen atoms in a one-to-one ratio. would it be correct to write the chemical formulas of each as ch? explain.

In the cathode ray tube experiment, j. j. thomson passed an electric current through different gases inside a cathode ray tube in the presence of an electric field. in which two ways did this experiment change scientists’ understanding of the atom?

Why does a plastic bottle that is sealed at a high altitude change it’s shape when taken to lower altitude