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Agata [3.3K]
3 years ago
7

Which statement is not true about the field of science? It is based on observations and explanations of the natural world. It is

based on rational thinking, inquiry, and experimentation. It is consistent and does not need to change with new discoveries. It is replicable and tested by many scientists over time.
Chemistry
2 answers:
Vesna [10]3 years ago
5 0
Science is constantly changing as new things are always being discovered, therefore "it is consistent and does not need to change with new discoveries" is false.
Vladimir79 [104]3 years ago
5 0

Answer: It is consistent and does not need to change with new discoveries.

Explanation:

The field of science demands the improvisation in the facts, theories and details which were proposed by earlier innovators and researchers. The changes are supported by new innovations and evidences which are the outcomes of the use of old as well as new scientific methodologies. The new innovators verifies the preproposed theories and inventions which leads to the amendments.  

On the basis of the above explanation, It is consistent and does not need to change with new discoveries. is the correct answer.

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K + I - > KI 
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What is the chemical formula for a compound between Li and Br?
natima [27]

LiBr.

<h3>Explanation</h3>

Note that the group number in this answer refers to the new IUPAC group number, which ranges from 1 to 18. Counts from the left. Start with the first two column (group 1 and 2), go on to the transition elements (Sc, Ti, etc. in group 3 through 12), and continue with the nonmetals (group 13 through 18).  

Li is a group 1 metal. As a metal, it tends to form positive ions ("cations"). Metals in group 1 and 2 are <em>main group</em> metals. The charge on main group metal ions tends to be the same as the group number of the metal. Li is in group 1. The charge on an Li ion will be +1. Formula of the Li ion will be \text{Li}^{+}.

Br is a group 17 nonmetal. As a nonmetal, it tends to form negative ions ("anions"). The charge on nonmetal ions excepting for H tends to equal the group number of the nonmetal minus 18. Br is in group 17. The charge on a Br ion will be 17 - 18 = -1. Formula of the Br ion will be \text{Br}^{-}

All the ions in an ionic compound carry charge. However, some of the ions like \text{Li}^+ are positive. Others ions like \text{Br}^{-} are negative. Charge on the two types of ions balance each other. As a result, the compound is <em>overall</em> neutral.

1 × (+1) + 1 × (-1) = 0. The positive charge on one \text{Li}^{+} ion balances the negative charge on one \text{Br}^{-} ion. The two ions would pair up at a 1:1 ratio.

The empirical formula for an ionic compound shows all the ions in the compound. Positive ions are written in front of negative ions. \text{Li}^{+} is positive and \text{Br}^{-} is negative. The formula shall also show the simplest ratio between the ions. For the compound between Li and Br, a 1:1 ratio will be the simplest. The "1" subscript in an empirical formula can be omitted. Hence the formula: LiBr.

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