Answer:
Element Symbol Atomic Mass # of Atoms Mass Percent
Lead Pb 207.2 1 46.732%
Explanation:
By using flame test we can identify the elements because colors which are given by elements with flame test are unique.
During the flame test, the electrons of the atom which are in ground state absorb energy and go to upper level. This is called electron excitation. Excited electrons are unstable. Hence, they come back to the ground state by emitting the energy as photons.If that released energy has a frequency which belongs to visual light, then that wave gives a color.
The colors observed during a flame test are caused by the presence of certain metal ions. When these metal ions are heated by a flame, the electrons in their outer energy level get excited and move to higher energy levels. As they return to their original energy levels, they release energy in the form of light, which we perceive as different colors.
During a flame test, the colors observed are caused by the presence of certain metal ions. When these metal ions are heated by a flame, the electrons in their outer energy level get excited and move to higher energy levels. As they return to their original energy levels, they release energy in the form of light, which we perceive as different colors.
For example, when a copper compound is heated, it emits a green color. This is because copper ions are responsible for this color. Different metal ions will emit different colors, allowing us to identify them by their characteristic flame color.
Therefore, the colors observed during a flame test are a result of the specific metal ions present in the substance being tested.
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Answer : The volume of 1 mole of and gases are the same.
Solution: Given,
Moles of = 1 mole
Moles of = 1 mole
Moles of = 2 mole
Formula used for ideal gas is :
P V = n R T
According to the question, the gases are at standard temperature and pressure. So, the volume of gases only depends on the number of moles. This means that the higher the number of moles, higher will be the volume of gas.
The moles of are more than the moles of and . So, the volume of will be more.
And the moles of and are equal. Therefore, their volumes are also equal.
Therefore, the best option is the volume of 1 mole of and gases are the same.