### Description

Chemistry (Unit 1+11 - Stoichiometry ) Quiz on QUIZ- Avigadro's number, created by yuvalgalshohet on 03/30/2014.
Quiz by yuvalgalshohet, updated more than 1 year ago
 Created by yuvalgalshohet over 8 years ago
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## Resource summary

### Question 1

Question
What is a mole?
• An animal
• 6.02 x10^23 atoms
• A gram of an element

### Question 2

Question
• Avigadro's constant or number is the number of atoms in a mole; 6.02 x10^23
• 07865543290

### Question 3

Question
What is meant by 'Structure of matter'?
• How different matter is created: atoms ---> molecules ---> bulk compound atoms ---> bulk element atoms ---> ions ---> bulk ionic compound
• How elements are structured in different temperatures

### Question 4

Question
What is RAM?
• Relative atomic mass; the ratio of the average mass per atom of the naturally occurring form of an element to one-twelfth the mass of an atom of carbon-12. RAM is averaged over the different isotopes.
• Memory in my computer

### Question 5

Question
Find the RAM of Carbon, Magnesium and Francium respectively
• 6, 12, 87
• 12, 24, 223

### Question 6

Question
What is meant by molecular mass?
• Molecular mass is the total mass of all the molar masses of atoms in a molecule
• Molecular mass is the mass of a molecule of CO2
• Molecular mass is the mass of one atom in a mole

### Question 7

Question
What is the difference between RAM and AMU?
• Atomic Mass Units make up the Relative Atomic Mass
• Relative Atomic Mass is the average mass of an element, when considering all its isotopes. Atomic Mass Unit is one twelfth of a carbon atom.
• Relative Atomic Mass is the Atomic Mass Unit divided by the number of atoms involved

### Question 8

Question
What is the formula for the number of moles?
• Moles= Total Mass/ Molecular Mass
• Moles= Total Mass/ Relative Atomic Mass
• Moles = Total Mass/ 6.02x10^23

### Question 9

Question
Find the Empirical Formula for NaOH + P4 +H2O --> PH3 + NaH2PO2
• 3NaOH + P4 +6H2O --> PH3 + 3NaH2PO2
• 3NaOH + P4 +3H2O --> PH3 + 3NaH2PO2

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