$CATEGORY: Science - TicTacLearn/3. Atoms and molecules/3. Atoms and molecules--Laws of Chemical Combination

//Multiple Choice

Who established the law of chemical combination?
{
~Dalton
=Lavoisier
~Avogadro
~Boyle
}

The law of conservation of mass states that\:
{
~Mass is conserved in an open system
~Mass is a variable in closed systems
~Mass is a variable in open systems
=Mass is conserved in a closed system
}

What is the basic unit of matter?
{
~Molecule
=Atom
~Compound
~Ion
}

The law of definite proportions states that\:
{
~Atoms are indivisible
~Mass is conserved in a reaction
~Matter can be created or destroyed
=Elements combine in fixed ratios
}

What is the basic principle of Dalton's atomic theory?
{
~Conservation of energy
~Law of electrostatics
=Law of chemical combination
~Law of gravitation
}

What is the color of copper carbonate?
{
~White
~Yellow
=Blue
~Green
}

What is the proportion of mass of Hydrogen and Oxygen in lake water?
{
~2\:1
=1\:8
~8\:1
~1\:2
}

The idea behind the divisibility of matter was given by\:
{
~Dalton
~Boyle
~Lavoisier
=Dalton
}


//True or False

The combined efforts of Lavoisier and Proust led to the establishment of three fundamental laws of chemical combination.{F}

The first law of chemical combination is the “Law of constant proportions”.{F}

Water's mass ratio of hydrogen to oxygen varies depending on its source.{F}

The law of constant proportions is similar to that of definite proportions.{T}

The atoms can be divided into subatomic particles.{T}

The mass of reactants is not always equal to the mass of products in a chemical reaction.{F}

The law of constant proportions applies only to pure substances.{T}

All chemical reactions involve a change in mass.{F}

//******** END **********