True or false:

1. a drain cleaner gives off heat when it breaks down the protein in a clogged drain pipe.

2. furniture polish can be made by mixing lemon juice and mineral oil.

3. hydrogen peroxide turns into water and oxygen when poured on a cut.

4. flatbread requires more yeast than regular bread.

!

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.

atomic mass = 39

number of neutrons = 20

number of protons= 19

electronic configuration = 1s2 2s2 2p6 3s2 3p6 4s1

the number of electron in first shell = 2

number of electrons in n=3 shell = 8