Iron rusting is an example of a change.
a. physical (only)
b. chemical (only)
c. physical and chemical

The gravitational force between pluto and charon is 3.61 × 1018 n. pluto has a mass of 1.3 × 1022 kg, which is only slightly greater than charon’s mass of 1.6 × 1021 kg. how far apart are pluto and charon? 2.0 × 107 m 2.4 × 1012 m 3.8 × 1014 m 5.8 × 1024 m

Explain the difference in reactivity of the elements based on their electron configurations.

If we compare the force of gravity to strong nuclear force, we could conclude that