QUIZ- Avigadro's number

Description

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

Question 1

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

Question 2

Question
What is avigadro's number?
Answer
  • 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'?
Answer
  • 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?
Answer
  • 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
Answer
  • 6, 12, 87
  • 12, 24, 223

Question 6

Question
What is meant by molecular mass?
Answer
  • 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?
Answer
  • 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?
Answer
  • 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
Answer
  • 3NaOH + P4 +6H2O --> PH3 + 3NaH2PO2
  • 3NaOH + P4 +3H2O --> PH3 + 3NaH2PO2
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