26. What does the law of conservation of momentum state? A. that when one object transfers momentum to a second object, the
second object also transfers momentum to the first object
B. that the total momentum of a group of objects is calculated as the
total mass of the objects times the total velocity of the objects
c. that the total momentum of a group of objects stays the same
unless outside forces act on the objects
D. that the momentum of a group of objects changes during elastic
collisions but not during inelastic collisions

each  column  of the  table  is called a group. elements in a group share similar properties. groups are  read  from  top  to  bottom. metal. metalloid. nonmetal. solid. liquid. gas. fe. hg. o.  2. 3. 4. 5. 6. 7. 8. 9.  2. beryllium. 9.012. 4.  sodium. 22.990.  11. 3.  magnesium. 24.305.  12.  potassium. 39.098.  19. 4.  calcium. 40.078.  20. i guess  i  

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.

i only know number one that’s a galaxy