The correct answer is (c) atomic mass units. The relative mass of a molecule is expressed in atomic mass units (amu) or daltons (Da). This unit compares the mass of a molecule to the mass of an atom of carbon-12, ...
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The correct answer is (c) law of conservation of mass. This law, proposed by Antoine Lavoisier, states that mass cannot be created or destroyed in a chemical reaction. The total mass of reactants before a reaction is equal to the ...
The correct answer is (d) Al. The chemical symbol of aluminium consists of a capital letter ‘A’ followed by a lowercase ‘l’. Chemical symbols always start with an uppercase letter, and if there is a second letter, it is lowercase.
The correct answer is (b) atom. According to Greek philosophers, especially Democritus, the smallest particle of matter that could not be further divided was called the “atom” (from the Greek word “atomos,” meaning indivisible). Modern science later refined this concept.
The correct answer is (b) Elements are always present in a fixed proportion by mass in a chemical compound. The Law of Constant Proportion, proposed by Joseph Proust, states that a chemical compound always contains the same elements in the ...