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Chemistry (Unit 1+11 - Stoichiometry ) Quiz on QUIZ- Avigadro's number, created by yuvalgalshohet on 03/30/2014.

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Created by yuvalgalshohet almost 9 years ago
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QUIZ- Avigadro's number

Question 1 of 9

1

What is a mole?

Select one of the following:

  • An animal

  • 6.02 x10^23 atoms

  • A gram of an element

Explanation

Question 2 of 9

1

What is avigadro's number?

Select one of the following:

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

  • 07865543290

Explanation

Question 3 of 9

1

What is meant by 'Structure of matter'?

Select one of the following:

  • How different matter is created:
    atoms ---> molecules ---> bulk compound
    atoms ---> bulk element
    atoms ---> ions ---> bulk ionic compound

  • How elements are structured in different temperatures

Explanation

Question 4 of 9

1

What is RAM?

Select one of the following:

  • 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

Explanation

Question 5 of 9

1

Find the RAM of Carbon, Magnesium and Francium respectively

Select one of the following:

  • 6, 12, 87

  • 12, 24, 223

Explanation

Question 6 of 9

1

What is meant by molecular mass?

Select one of the following:

  • 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

Explanation

Question 7 of 9

1

What is the difference between RAM and AMU?

Select one of the following:

  • 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

Explanation

Question 8 of 9

1

What is the formula for the number of moles?

Select one of the following:

  • Moles= Total Mass/ Molecular Mass

  • Moles= Total Mass/ Relative Atomic Mass

  • Moles = Total Mass/ 6.02x10^23

Explanation

Question 9 of 9

1

Find the Empirical Formula for NaOH + P4 +H2O --> PH3 + NaH2PO2

Select one of the following:

  • 3NaOH + P4 +6H2O --> PH3 + 3NaH2PO2

  • 3NaOH + P4 +3H2O --> PH3 + 3NaH2PO2

Explanation