Chemistry Review Module 3 Exam

Question 1

Who is Democritus Leucippus (400 B.C.E)

Answer 1

Believed matter is made up of indivisible partials, originally thought there were 4 elements.

Question 2

Who came up with the Law of conservation of mass?

Answer 2

Antoine Lavoisier

Question 3

Who is John Dalton (1766-1844)?

Answer 3

Came up with the first atomic theory.

-elements are made of tiny, individual particles called atoms. Not supported

-All atoms of an element are identical, have the same properties. Not supported

• The atoms of each element are unique. Still supported by the periodic laws.
• Atoms can join together in whole number ratios to form fixed compounds. Still supported through the law of definite proportions.
• Chemical reactions involve reorganization of the atoms (atoms are unchanged). Still supported through the law of conservation of mass.

Question 4

In 1829, the German chemist ________________ observed that several elements could be classified into groups of three, or triads

All three elements in a triad showed very similar there chemical properties and an orderly trend in physical properties.

Answer 4

J. W. Döbreiner

Question 5

Explain Mandeleev’s periodic table?

Answer 5

• arranged In order of increasing atomic mass
• noticed that periodically the PP/CP of elements repeated themselves.
• divided the list of elements into a series of row/ periods
• started a new row each time he found an element with similar chemical properties
• Mendeleev left blanks for undiscovered elements
• switched the position of several of the elements so the properties of the elements would fit with the elements above.

Question 6

Who arranged the modern periodic table? How was it arranged?

Answer 6

Moseley. Moseley arranged the elements in order of increasing atomic number which led to the periodic law.

Question 7

What is the periodic law?

Answer 7

When element s are arranged in order of increasing atomic number, there is a periodic repetition of there properties.

Question 8

Each elements has?

Answer 8

Unique atoms=unique atomic number= # of the protons.

Question 9

_______>

Answer 9

Row/ periods

Question 10

|^

Answer 10

Groups/ families

Question 11

Most metals could be found where?

Answer 11

Towards the left.

Question 12

Where can nonmetals be found?

Answer 12

Upper-right side of the periodic table.

Question 13

Where can metaloide be found?

Answer 13

Between metals and no metals.

Question 14

Describe Group 1A Alkaline earth metals.

Answer 14

-soft metals
- react violently with water

Question 15

Describe Group 2A.

Answer 15

-less reactive than group 1A
- burn brightly