It is a stable isotope of lead metal. this isotope is of nonradioactive nature. The isotope occur naturally but can also be produced by fission reaction.
It appears as gray powder. With molecular weight of 207.9g/mol.
The boiling point is 1740° while the melting point is 327.4°
It is immediately available as typical and in custom packing of different grade of food, agriculture and pharmaceuticals.
it is used for biomedical and biological labelling. It is also used to measure pb (lead) level in blood by glycogen isotope dilution technique.
Formula for converting g to kg : divide by 1000
12 / 1000 = 0.012
Answer:
a.) because your ankle is taking in cold energy from the cold pack
Explanation:
all of the other ones say heat, which is not applied in this question
Answer:
A. Show that the total of the masses of the starting substances equals the mass of the mixture.
Explanation:
Law of conservation of mass:
According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.
This law was given by French chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.
For example:
In given photosynthesis reaction:
6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂
there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass.
In a similar way if we have mixture of sugar and sand the total weight of mixture is equal to the weight of reactants.
sand + sugar + water → mixture
10g+5g+20 g = 35 g
Answer:
3.46*10⁻²² kJ
Explanation:
By the Avogadro's number, 1 mole of electrons at 1 mole of atoms correspond to 6.02x10²³ electrons. So it's necessary 208.4 kJ to remove 6.02x10²³ electrons. To remove a single electron:
6.02*10²³ electrons ---------------- 208.4 kJ
1 electron ---------------- x
By a simple direct three rule:
6.02*10²³ x = 208.4
x = 3.46*10⁻²² kJ