Chemistry, 21.07.2019 03:31 cshopholic4921

Which of these are chemical changes in matter? check all that apply. mixing lemonade powder in water bleaching your hair mowing the lawn lighting a match letting fruit rot?

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Answer from: tiff3692

Answer is: bleaching your hair, lighting a match letting fruit rot.

bleaching your hair, lighting a match letting fruit rot are chemical changes (chemical reactions), because new substances are formed, the atoms are rearranged and the reaction is followed by an energy change.

Physical property can be observed and measured without any changes in molecular composition.

The same substance is present before and after the psysical change (mowing the lawn), just with different form or state of matter.

Making mixture (mixing lemonade powder in water) is physical change (physical change is reversible).

Answer from: drunkelmo04

bleaching your hair, lighting a match, and letting fruit rot.

Explanation:

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

The answer is !

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