Chem 1A Topic 1,2

Question 1

What are the properties of metals

Answer 1

They have high electrical and heat conductivity and maliuable (can be ponded into thin sheets) ductile and lustrous (are shiny)

Question 2

What did JJ Thompso discovered in his experiment

Answer 2

He discover that a magnet could be used to deflect a beam of light.

Question 3

What is SI Multiplier for Deci

Answer 3

10^-1

^0.01

Question 4

What is the SI Multiplier for Milli (m)

Answer 4

10^-3

^or

^0.001

Question 5

What is SI Multiplier for Micro

Answer 5

10^-6

Question 6

What is SI Multiplier for nano (n)

Answer 6

10^-9

Question 7

What is SI Multiplier for Pico (p)

Answer 7

10^-12

Question 8

what is SI Multiplier for Mega (M)

Answer 8

10⁶

Question 9

What is SI Multiplier for Centi (c)

Answer 9

10^-2

Question 10

What is the SI Mulitlier for Kilo (k)

Answer 10

10³

Question 11

What is Physical Property?

Answer 11

A measure with out changin the chemical composition of the substance.

Question 12

What is Physical Change?

Answer 12

A physical change is when a substane changes it’s physical apperance but not its chemical composition

Question 13

What is Chemical change?

Answer 13

A chemical change occurs when a substance changes into another substance.

Ex. the burning of butance

Question 14

What is Chemical Proterty?

Answer 14

Chemical property describes a substance compositon.

Question 15

What is the formula for Density?

Answer 15

D=Mass (g) or (kg) / Volume (L) or ( Cm³

Question 16

What does the Law of Conservation fo mass says?

Answer 16

It says that matter cannot be created or destroyed

Question 17

What does The Law of Definite Proportions Indicates?

Answer 17

It indicates that a given chemical compound contains the same proportions of each elements by mass.

Question 18

What did Dalton discovered in his theory?

Answer 18

1. He Discovered that elements are composed of small particles called Atoms
2. Every atom of a given element is the same in every way but atoms of different elements are different.
3. Atoms of an element cannot be destroyed or transformed into something else. Compounds are formed by combining atoms.

Question 19

Name the properties of Metals

Hint: They are six of them

Answer 19

• They exhibit high electrical and heat conductivity
• They are Malleable (pounded into sheets)
• They are ductile
• They are shiny
• Metals loose electrons

Question 20

What did JJ Thompson proposed?

Answer 20

He proposed that the cathode ray contained tiny charge particles called electrons.

Question 21

What are the three factors that would affect the amount that the cathode ray can deflec?

Answer 21

1. The strength of the magent
2. the charge of the elctron
3. the mass of the electron

Question 22

Which factors could JJ Thompson easily control in experiment?

Answer 22

He could control the streght of the magent.

Question 23

JJ Thomposon was unable to measur tha mass or the charge but what was he able to measure?

Answer 23

He was able to measure the mass ration of an electron

ê=1.758820E⁸ C/g

Question 24

What the RA Millikan discovered in his oil experiment?

Answer 24

He discovered that the charge was always a whole number ratio of 1.602176E^-19 C

Question 25

In RA Millikan experiment what was the mass of an electron?

Answer 25

the mass is 9.109382E^-28g

Question 26

What did Rutherford discovered about the atom?

Answer 26

Atoms can be divided in smaller particles _ protons, neutrons and electrons Atom from one element can be changed into another element throuhg Nuclear reaction but not by ordinary chemical reactions. Atoms of the same element are NOT all identical. They have many properties that are the same, but some (including mas) that are different.

Question 27

What is the unit for expressing masses of atoms?

Answer 27

amu = Atomic Mass Unit also know as atomic mass

Question 28

Name the Elements that are Diatomic?

Answer 28

**Have - H**ydrogen H₂ **No - N**itrogen N₂ **Fear - F**luorine F₂ **Of - O**xigen O₂ **Ice - I**odine I₂ **Cold - C**arbon C₂ **Beer - B**romine Br₂

Question 29

What is a Molecule

Answer 29

A molecule is chemical formula that has more than one atoms - Diatomic Elements are molucular.

Question 30

What is the Molar Mass?

Answer 30

The mass of one mole of a substance - it equal the atomic mass - amu

Question 31

Visualise the groups on periodic table

Answer 31