Does anyone know the answers to 6& 7? ?

Question 1.). Answer > As indivisible, and indestructible

Key Concept 2.). Answer > By using experimental methods, Daltons transformed Democritus's ideas on Atoms into a scientific theory.

Key Concept 3.). Answer > The instrument that can be used to observed individual atoms, despite their small size, individual atoms are observable with instruments, such as scanning tunneling microscopes.

Question 4.). The main Ideas of Dalton's Atomic Theory:

All elements are composed of tiny indivisible particles called Atoms.

Atoms of the same element are identical.

Atoms of different elements can physically mix together or can chemically combine in simple whole number ratios to form compounds.

Chemical reactions occur when atoms are separated, or joined, or rearranged.

Question 5.). Answer > Democritus's ideas were not based on experimental results, and did not explain behaviour. Dalton's ideas were emperically based and did explained chemical behavior; his experiments showed that the ratios in which elements combined were whole numbers.

Question 6.). Answer > The Radii of most Atoms fall wihtinthe range the range of 5 x 10 ^ - 2 nm to 2 x 10^ - 1 nm.

Question 7.). A sample of copper with a mass of 63.5 g contains 6.02 x 10^23 atoms.

(63.5 ) / (6.02 )(10 ^23)

10.5481276 (10^23)

1.0548 (10^ - 2)

Therefore, > The mass of a single copper atom > 1.05 x 10^ - 2 g

The mass of a single copper atom:

Answer > 1.05 x 10^22 g

The Idea/Summary > Atoms of one element are never changed into atoms of another element as a result of a chemical reaction.

Hope that helps : )

a