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CHEMISTRY IN SOCIETY: Fertilizers
ENVIRONMENTAL EDUCATION: Chemistry In Society - Extraction Of Metals
MATTER - PROPERTIES AND TRANSFORMATION: Chemistry Of Elements - Alkali metals and alkaline earth metals
MATTER - PROPERTIES AND TRANSFORMATION: Chemistry Of Elements - Identification Of Ions
MATTER - PROPERTIES AND TRANSFORMATION: Chemistry Of Elements - Salts
MATTER - PROPERTIES AND TRANSFORMATION: Chemistry Of Elements - Transition metals
MATTER - PROPERTIES AND TRANSFORMATION: Principles Of Chemistry - Formulae, Moles And Equations
MATTER: PROPERTIES AND TRANSFORMATION: Rates Of Reaction
MATTER: PROPERTIES AND TRANSFORMATION: Reversible Reactions
PRINCIPLES OF CHEMISTRY: Electrochemistry
PRINCIPLES OF CHEMISTRY: Gaseous State
5/96 MCQs for:
MATTER - PROPERTIES AND TRANSFORMATION: Principles Of Chemistry - Formulae, Moles And Equations
To determine the formula of copper oxide by mass differences, a known mass of copper is heated in air. What is the key measurement taken after heating?
The initial mass of the crucible.
The volume of oxygen consumed.
The mass of the resulting copper oxide.
The temperature change during the reaction.
The relative atomic mass (
RAM
) of an element is defined as:
(Average mass of one atom of an element) / (1/12 mass of one atom of carbon)
(Average mass of any atom of an element) / (1/12 mass of one atom of carbon-12 )
(Average mass of one atom of an element) / (1/12 mass of one atom of carbon-12 )
( mass of one atom of an element) / (1/12 mass of one atom of carbon-12 )
What is the percentage composition by mass of oxygen in carbon dioxide (CO₂)? (C=12, O=16)
66.7%.
72.7%.
27.3%.
50.0%.
A mole of a substance is defined as __
The amount of the substance that contains the same number of elementary compounds such as atoms, molecules, ions etc, as there are carbon atoms in exactly 12 grams of carbon-12.
The amount of the substance that contains the same number of elementary particles such as atoms, molecules, ions etc, as there are carbon atoms in exactly 12 grams of carbon-12.
The amount of the substance that contains the same number of elementary particles such as atoms, molecules, ions etc, as there are in exactly 12 grams of carbon-12.
The amount of the substance that contains the same number of elementary particles such as atoms, molecules, ions etc, as there are carbon atoms in exactly 12 grams of carbon.
The mass in grams of one mole of a substance is:
Gas constant
Molar mass
Avogadro constant
Mole