The number of chlorine atoms needed would simply be the
ratio of distance and diameter. But first convert 200 pm to mm:
<span>200 pm = 2 E-7 mm </span>
So the number of chlorine atoms needed is:
<span>1.0 mm / (2 E-7 mm) = 5,000,000 Chlorine atoms = 5 E6
atoms</span>
Answer:
Coal contains chemical potential energy
Explanation:
Chemical species are known to contain chemical energy. Chemical energy is contained in chemical bonds in a chemical substance.
Since energy can neither be created nor destroyed, energy contained in chemical bonds can be transformed from one form to another. Coal contains chemical energy.
One of the ways of generating electricity is the combination of fossil fuels. This involves the conversion of chemical energy to heat energy. The steam produced is used to turn a turbine. The turning off the turbine implies a conversion of heat to mechanical energy. The turning of the turbine now produces electrical energy.
The theoretical yield of BaCO3 is 5.5
<h3>What is theoretical yield?</h3>
The theoretical yield is the yield calculated from the stoichiometry of the reaction. The equation of the reaction is;
Ba(NO3)2(aq) + Na2CO3 (aq) ------> BaCO3(s) + 2NaNO3(aq)
Number of moles of limiting reactant: 0.4 M × 70/1000 = 0.028 moles
Since the reaction is 1:1,om;y 1 mole of BaCO3 is formed. Hence, mass of BaCO3 = 0.028 moles × 197 g/mol = 5.5g
Learn more about theoretical yield: brainly.com/question/2506978
The variation of atomic radii in group 3A,4A,5A and 6A elements is caused by increase in size of the nuclear charge.
Periodic trends are the properties that change down the group and across the period in the periodic table. These properties include; atomic radii, ionic size, electron affinity, electronegativity, ionization energy, etc.
The atomic radii of elements is directly related to the size of the nuclear charge. Across the period, the size of the nuclear charge increases whereas screening remains constant (no new shell is added).
As a result of increased electrostatic pull of the nucleus on the outer electrons, the atomic radii in group 3A,4A,5A and 6A elements decreases progressively across the period.
Learn more: brainly.com/question/4287157
