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Q 01 / 25
Matter is anything that has mass and occupies space.
Q 02 / 25
The SI unit of mass is kilogram.
Q 03 / 25
One mole of any substance always contains exactly 1 gram of that substance.
Q 04 / 25
Atomic mass unit is defined as exactly one-twelfth the mass of a carbon-12 atom.
Q 05 / 25
The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction.
Q 06 / 25
Relative atomic mass has no unit.
Q 07 / 25
Avogadro number represents the number of atoms in exactly 12 g of carbon-12.
Q 08 / 25
The empirical formula of a compound represents the actual number of atoms of each element in one molecule.
Q 09 / 25
Density is defined as mass divided by volume.
Q 10 / 25
If the molar mass of a compound is twice its empirical formula mass, the molecular formula is double the empirical formula.
Q 11 / 25
The law of definite proportions states that a chemical compound always contains the same elements in the same mass ratio.
Q 12 / 25
Mole fraction is always greater than one for the major component of a mixture.
Q 13 / 25
For a balanced chemical equation, the number of atoms of each element must be equal on both sides.
Q 14 / 25
Molar mass of a substance is numerically equal to its molecular mass but expressed in \(\mathrm{g\,mol^{-1}}\).
Q 15 / 25
In a limiting reagent problem, the reactant present in excess determines the amount of product formed.
Q 16 / 25
Percentage yield of a reaction can be greater than 100% if excess reactant is used.
Q 17 / 25
The average atomic mass of an element depends on the isotopic composition of that element.
Q 18 / 25
One mole of an ideal gas occupies 22.4 L at STP.
Q 19 / 25
If 1 g of hydrogen reacts completely with oxygen, the mass of water formed must be greater than 1 g.
Q 20 / 25
The number of significant figures in a measured quantity depends on the measuring instrument.
Q 21 / 25
When two reactants are mixed in stoichiometric proportions, neither is left unreacted after completion.
Q 22 / 25
In dimensional analysis, conversion factors are treated as exact numbers.
Q 23 / 25
If the molar mass of a compound is an integral multiple of its empirical formula mass, that multiple must be an integer.
Q 24 / 25
The law of multiple proportions applies only when two elements form exactly two compounds.
Q 25 / 25
In a reaction, if the actual yield is much lower than the theoretical yield, side reactions and losses are possible causes.
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