Chemistry, 13.02.2020 04:50 kev71

The density of your unknown polymer was tested using H 2 O the density of your unknown was tested using ethanol (density 0.789g/) (abbreviated BIOH) instead of water, what would be the results

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Answer from: Brandonjr12

Testing the density of unknown polymer in water would give you the actual density of the polymer.

Explanation:

The density of ethanol is given in the question as 0.789 g/ml whereas the density of water is 1 g/ml. Density is defined as the ratio of the mass of the liquid to the volume of the liquid. Water has a reference point as 1 which makes our life easier and the polymer's value does not give us the actual density of the unknown polymer. Ethanol is formed from water only by evaporation but still, it has a low boiling point as compared to water.

Answer from: Quest

assuming that your periodic table has eighteen columns, you should highlight the four elements in the third column from the left of the table.

explanation

neutral atoms of elements after calcium contain d electrons. the energy of d orbitals of a particular main shell lies between the energy of the s and p orbitals of the next main shell. for example, electrons in the $3d$ have energy higher than those in the $4 s$ orbital while lower than those of the $4 p$ orbital.

by the aufbau principle, electrons fill orbitals one at a time, starting from those of the lowest energy. the $4s$ orbital is therefore filled right after $3p$ orbitals and before $3 d$ orbitals.

potassium has electron configuration $[\text{ar}] 4 s^{1}$ and calcium $[\text{ar}] 4 s^{2}$ . the s orbital of a main shell holds a maximum of two electrons. the next element would thus have the electron configuration $[\text{ar}] 4 s^{2} \; 3d^{1}$ and satisfy the requirements.

a neutral atom of the element contains three electrons on top of the most recent noble gas element. it should thus be placed in the third column of the periodic table. both scandium and yttrium would satisfy the conditions. an aufbau diagram indicates that the 4f orbital is filled before the 5d. however, it appears that exceptions exists for both lanthanum and actinium. neutral atoms of the two d-block elements also demonstrate the $ns^{2} \; (n-1) p^{1}$ and should be highlighted as well.

Answer from: Quest

What are the options? i can you if you give them.

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The density of your unknown polymer was tested using H 2 O the density of your unknown was tested us...