18 Questions
According to the law of conservation of mass, matter can be ___.
Created
What does Avogadro number represent?
Number of particles in a mole of a substance
According to the law of definite proportion, what is true about compounds?
Same compound always contains the same elements in a fixed mass ratio
What is the significance of the mole in chemistry?
Relates the mass of a substance to its number of particles
How do hydrogen and oxygen combine in water according to Avogadro's number?
2:16 ratio
What concept does the law of conservation of mass illustrate?
Stoichiometry
What is the molecular formula of Benzene?
C6H6
Who proposed the concept of empirical formula?
John Dalton
In the compound H2O, what is the ratio of hydrogen to oxygen?
1:2
When two elements combine to form more than one compound, what is the law that governs the mass ratio of the elements?
Law of Multiple Proportions
In the compounds CO and CO2, what element remains fixed while the other element's mass varies?
Carbon
What does the empirical formula represent in a compound?
Simplest ratio of elements in a compound
What is a disproportionation reaction in a redox reaction?
When the same element oxidizes and reduces simultaneously
In a redox reaction, if NH4OH and NH4Cl react, which process occurs?
Reduction only
What is reduction defined as?
Removal of oxygen or decrease in oxidation number
What is the Stock Notation for Fe(II) and Sn(IV) in the compounds Fe(II)O2 and SnCl4, respectively?
[Fe^+2] and [Sn^+4]
Identify the oxidant and reductant in the reaction: MnO4-(aq) + Br-(aq)?
MnO4- is the oxidant, Br- is the reductant
What happens in a disproportionation reaction?
The same element undergoes both oxidation and reduction
Test your knowledge on fundamental concepts and laws in chemistry including the law of conservation of mass and the concept of mole as related to Avogadro's number. This quiz covers basic principles proposed by Lavoisier and Avogadro.
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