Chemistry, 21.08.2019 06:00 lizzyhearts

Asubstance that contains hydrogen that may be replaced by a metal is a/an
a. acid.
b. colloid.
c. nonmetal.
d. base.

Answers: 2

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Answer from: ijohnn15

The substance that contains hydrogen that may be replaced by a metal is called an acid. The answer therefore to this item is letter A. When the compound is dissolved in water, it forms H+ ion and the anion that is part of the compound. It may be classified as strong or weak.

Answer from: bettinger6525

The correct answer is option A. A substance that contains hydrogen that may be replaced by a metal is an acid. An acid is of the form RCOOH. For example, if it is made to react with a metal, then the by-product of the reaction will be a salt. RCOOH + Na (Sodium) = RCOONa (salt).

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

Man i dont know this answer

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Asubstance that contains hydrogen that may be replaced by a metal is a/an
a. acid.
b. co...