Chemistry, 23.09.2019 05:30 krojas015

Dry ice, or solid carbon dioxide, has the molecular formula co2. how should you classify it?
element
compound
mixture
colloid
suspension

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The answer is compound. The compound CO2 is consists of element carbon and element oxygen. The solid CO2 is just a solid status of pure CO2.

Answer from: Bescobar017

Answer;

A compound

Explanation;

A compound is a substance formed when two or more chemical elements are chemically bonded together. In other words a compound consists of atoms or ions of two or more different elements in definite proportions joined by chemical bonds into a molecule.

- In our case; solid carbon dioxide contains three atoms, that is two oxygen atoms and one carbon atom that are chemically combined, thus it is a compound .

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

1. o2(g)as a product

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Dry ice, or solid carbon dioxide, has the molecular formula co2. how should you classify it?
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