Answer:
Explanation:
A conjugate base is formed when an acid in reaction with a base lose a proton H+.
For example if RCOOH that is an acid, reacts with water that is a base, the RCOOH loses an H+ and it becomes that is the conjugate base; and the water gains the H+ and become the conjugate acid, that is:
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The RCOO- is the conjugate base
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In this case the is the conjugate base
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The is the conjugate base
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The is the conjugate base.
Answer: The atomic mass in the periodic table is a weighted average of all naturally occuring isotopes of zinc.
Explanation: The elements consist of protons, neutrons, and electrons. Protons and nuetrons are assigned a mass of 1 amu (atomic mass unit). Electrons are too small to make a big difference in the mass, so they are assign a 0 for their amu. Since the elements consist of just these three particles, any one atom must add up to a whole number atomic mass. Zinc consists of 30 protons, by definition. A neutral atom has 30 electrons. The balance of a zinc atom is made up of neutrons. A Zn-65 atom would have 30 protons and 35 neutrons:
30 Protons = 30 amu
35 Neutrons = 35 amu
30 Electrons = 0 amu
Total AMU = 65
Any <em><u>ONE </u></em> Zn atom should have a whole number atomic mass. But zinc in the environment has isotopes of zinc - atoms that contain differing numbers of neutrons. A Zn-66 atom would have 36, instead of 35 neutrons. (P:30, N:36, E:0 = 66 amu). The atomic mass in the Periodic Table reflects the average of these isotopes as found in the environment. If the 65 and 66 isotopes were the only ones found naturally, an atomic mass of 65.38 would suggest around 60% of the atoms are Zn-65 and 40% are Zn-66. The average weight atomic mass would would be 65.40
Answer:
Positively Charged
Explanation:
The is a group XVI and period 4 element of the periodic table with similar physical and chemical to that of tellurium and sulfur. Selenium exist in different allotropic forms, which have different solubility including selenate, selenite and selenium in elemental form
The Se ion in selenate has a positive charge of +6, while the selenate ion has a charge of -2
The Se ion in selenite has a charge of +4, while the selenite ion has a negative charge of -2.
The charge of Se in elemental selenium is 0.
And then you jam your finger
4 Na + O₂ = 2 Na₂<span>O
</span>
4* 23 g Na --------> 16 g O₂
9.5 g Na ------------> ?
Mass of O₂ = 9.5 * 16 / 4 * 23
Mass = 152 / 92
Mass = 1.6521 g of O₂
Molar mass O₂ = 16.0 g/mol
1 mole O₂ ------------ 16.0 g
? mole O₂ ------------ 1.6521 g
mole O₂ = 1.6521 * 1 / 16.0
≈ 0.10325 moles of O₂
hope that helped!