Read the following statements. Place V or F. a) Magnitudes are properties that characterize bodies or natural phenomena, and that cannot be measured.

b) A student compares the length of the classroom with a fixed quantity of the same magnitude. And to the magnitude he assigns a number and a unit, it is said, that he is measuring.

c) A time of: 15 minutes, a length of: 2 meters and a mass of: 250 grams are vector quantities.

d) The fundamental quantities are: length, weight, time, intensity of electric current, temperature, light intensity and quantity of substance.

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.