For the precipitation lab, what would be an appropriate use of a beaker?
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For chemical changes like precipitation, appropriate use of a beaker is to provide space for the precipitate to form and for the color of the precipitate to be distinct.
Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.
There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.
Thus, appropriate use of a beaker is to provide space for the precipitate to form and for the color of the precipitate to be distinct.
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2. more valence electrons
3. fewer electron shells
4. more electron shells
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Compared to the atoms of nonmetals in period 3, the atoms of metals in period 3 have fewer valence electrons.
Option 1 is correct.
In the periodic table, the period runs from left to right on the table while the group runs from top to bottom on the table.
In period 3, the period starts with Sodium Na(alkali metal), Magnesium Mg(alkaline earth metals), Aluminium Al(other non metals), Silicon Si (non metals), Phosphorus (non-metals), Sulfur (non-metals). etc.
From left to right across period 3, the valence electrons in the outermost increase.
Hence, the metals will have fewer valence electrons since the metals start period 3.
Therefore, we can conclude that compared to the atoms of nonmetals in period 3, the atoms of metals in period 3 have fewer valence electrons.
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Answer : Option A) Fewer valence electrons
Explanation : Compared to the atoms of non metals in period 3, atoms of metals in period 3 have fewer valence electrons.
There are 8 elemental members in third period which are eight: sodium, magnesium, aluminium, silicon, phosphorus, sulfur, chlorine, and argon.
The first 2 elements belong to s-block whereas the other elements belong to p-block. The atomic radius is found to decrease across the period.
The electrons in the valence shell increases as we go from left to right in the period, which means when we move from metal to non-metal side the number of valence electrons also increases. This clearly shows that metals have fewer valence electrons as compared to the non-metals.
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x = isotope about mass (1.0078u)
y = isotope about mass (2.0140u)
x + y = 100%
so:
x = 100% - y
answer:
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Answer:
terremotos
Explanation:
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Answer:
One mole of a substance is equal to 6.022 × 10²³ units of that substance (such as atoms, molecules, or ions). The number 6.022 × 10²³ is known as Avogadro's number or Avogadro's constant.
Explanation:
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The chemical name for Fe(HCO₃)₂ is iron(II) bicarbonate.
Iron (II) compounds typically form coordination complexes with ligands that have a higher affinity for binding to the iron ion. Bicarbonate is a relatively weak ligand and is more commonly found as a component of soluble salts, such as sodium bicarbonate (NaHCO3) or potassium bicarbonate (KHCO3).
In this compound, the iron ion has a +2 charge, and the bicarbonate ion (HCO3-) has a -1 charge. When these ions combine, the resulting compound is named accordingly with the Romannumeral (II) to indicate the iron ion's charge.
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