The Precision of a calculated answer is limited by the least precise measurement used in the calculation is false.
If the average value of different measurements is similar to the correct value of the measurement is said to be accurate and if the value of different measurements is close to each other then it is said to be precise.
The everage value of the different measurements may or not may be the same as exact and the resultant values must be the same as the calculated value for the precision of the result.
Therefore, the Precision of a calculated answer is limited by the least precise measurement used in the calculation is false.
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Answer:
D
Explanation:
Answer: Na⁺, SO₄ ²⁻.
Justification:
This is just a part of a bigger question.
But the instructions are complete to construct the ions.
The first ion requested is the sodium ion.
The symbol of sodium is Na.
When an electron is removed from the neutral atom, the atom wil result with an excess of protons, which translates onto an excess of positive charge.
Then, to show the new particle you must add a positve sign (+) in the form of superscript.
That is why you write Na⁺. By the way, a positive ion is named cation.
Regarding sulfate ion, it comes from the sulfuric acid, when you remove the two hydrogen atoms, each with a positive charge, then the sulfate ion will stand with a negative charge of 2.
The charge is told to belong to the entire ion, not a particular atom, soy you wirte it with the 2- symbol as a superscript for the entire species:
SO₄ ²⁻. A negative ions is called anion.
The answer, then, is: Na⁺, SO₄ ²⁻.
Writing the ion: Na⁺,SO₄²⁻
Ionic compounds consisting of cations (ions +) and anions (ions -)
The naming is preceded by the cation then the anion with the -ide suffix added
Generally for this ion compound consists of metal elements as cations and non-metals as anions
Metal: cation, positively charged.
Nonmetal: negative anion.
The anion cation's charge is crossed
Example:
Fe₂S₃
Fe charge = 3+
S charge = 2-
The writing of the ionic charge is placed as a superscript behind the molecule/ atom, and the number is written before the positive or negative sign. For a single charge, there is no need to write the number
Example
Cl⁻ (single charge)
Mg²⁺ not Mg⁺²
For the element Na symbol which is group 1A and releases one electron, the symbol writing would be: Na⁺(single charge)
For polyatomic ions, the superscript charge is written after the subscript on the polyatomic element, so it becomes SO₄²⁻
These two ions when combined and bind to Na₂SO₄ (The anion cation's charge is crossed)
if written separately as Na⁺, SO₄²⁻
the chemical formula for each ionic compound.
two functional groups that contain ionic charges
Binary ionic compounds
Keywords: chemical compound, the naming of chemical compounds