Chapter 6

Question 1

Density equation

Answer 1

p=m/v

Question 2

Atoms

Answer 2

The smallest unit of an element that possesses all the properties of that element.

Question 3

Atom anatomy

Answer 3

protons and electrons in the nucleus, electrons orbit around nucleus

Question 4

Democritus

Answer 4

Greek pholosepher, (5th century BC) proposed that all substances were made up of tiny, indivisible particles. The Greek word “atomos” means indivisible.

Question 5

John Dalton

Answer 5

Physicist, (1803) Created the first atomic model consisting of 5 points. He was mostly correct.

Question 6

J.J. Thompson

Answer 6

British physicist, revealed the existance of electrons using a cathode ray tube to produce a negatively charged beam at a fluorescent screen. developed plum pudding model.

Question 7

Ernest Rutherford

Question 8

Niels Bohr

Question 8

Niels Bohr

Question 9

Dalton’s 5 points

Answer 9

1 All substances are composed of tiny, indivisible particles called atoms.

2 All atoms of the same element are identical.

3 Atoms of different elements have different weights.

4 Atoms combine in whole number ratios to form compounds.

5 Atoms are neither created nor destroyed in chemical reactions.

Question 10

Daltons first two points revised

Answer 10

• We know that atoms are actually made of electrons, protons and nuetrons.
• We’ve learned that there are exceptions that vary from element to element

Question 11

Daltons first two points revised

Answer 11

• We know