Which of these is an example of a homogeneous mixture A- Distilled water
B- A bar of pure gold
C- A solution of salt water
D- Carbon dioxide

C- A solution of salt water

Explanation:

You cannot see the salt within the water, for it has already dissolved. The contents are uniformly distributed throughout the water's volume.

I hope this made sense! (^-^)

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.