Automobiles are powered by an internal combustion engine. The engine converts the chemical energy in gasoline and oxygen into heat, that is then transformed into the propulsive energy that moves the automobile. Which statement most accurately describes the energy used to move the automobile ?
B
A Kinetic energy is stored by chemical and thermal energy
The chemical energy stored in gasoline and oxygen is converted into thermal energy and is then transformed into mechanical energy.
Thermal energy is transformed into chemical energy and is then converted into mechanical energy
The chemical energy in gasoline and oxygen is converted into heat.
C
D

Which of these reactions are redox reactions? check all that apply. cd + hcl → cdcl2  + h2cucl2  + na2s → 2nacl + cuscaco3  → cao + co2          2zns + 3o2  → 2zno + 2so2          ch4  + 2o2  → co2  + 2h2o

What semimetal can form four single covalent bonds.

Why do you suppose the structural polysaccharide cellulose does not contain branches? why do you suppose the structural polysaccharide cellulose does not contain branches? branches in the molecule would generate side chains that would almost certainly make it difficult to pack the cellulose molecules into globules, thereby decreasing the flexibility and strength of the globules. branches in the molecule would generate side chains that would almost certainly make it difficult to pack the cellulose molecules into microfibrils, thereby increasing the rigidity and strength of the microfibrils. branches in the molecule would generate side chains that would almost certainly make it difficult to pack the cellulose molecules into globules, thereby increasing the flexibility and strength of the globules. branches in the molecule would generate side chains that would almost certainly make it difficult to pack the cellulose molecules into microfibrils, thereby decreasing the rigidity and strength of the microfibrils.