Question

important points about science

Answer 1

Atoms and molecules move faster and farther apart when heat is added.

 

2.Different types of relationships shown on a graph.

 

 

 

 

 

                            

Cyclical               Direct                          Inverse             No Relationship          

 

 

3.Heat is added to go from a solid to a liquid to a gas.  Heat is taken away to go from a gas to a liquid

   to a solid.

 

 

4.Reflection is when light rays bounce off a surface.

 

 

 

5.Refraction is when light rays bend as they pass through a substance.

   Ex. Through water.

 

6.Light can travel through a vacuum, sound cannot.

 

7.Light travels much faster than sound.

 

8.Gravitational attraction is determined by the mass and distance between 2 objects.  -  The closer you

   are to a large (massive) object the greater the pull of gravity.

 

                                                                                  

 

9.The ball has maximum Potential Energy at A.

 

  The ball has maximum Kinetic Energy at B.

 

  The ball has both Kinetic and Potential Energy at C.

 

 

 

10.Renewable energy sources include: solar, wind, biofuels (wood, alcohol), water (hydropower).

 

11.Fossil fuels are nonrenewable.  They include: coal, oil and natural gas.

     The sun is the original source of energy for fossil fuels.

 

 

12.Solubility means how well something can dissolve.

 

13. In a physical change, no new substances (new molecules) are formed.  All changes of phase are

      physical changes.

 

14. In a chemical change, new substances (new molecules) are formed.

 

15.The substances in a mixture are not chemically combined.  They can be easily separated by

     methods such as, filtering, differences in density, solubility and magnetism.