Chose the statements below that are TRUE about bases. Group of answer choices Metals in the second group make bases of the form M(OH)2 Ammonium is an example of a "Nitrogen with 3 groups" base Metals in the first group make bases of the form M(OH)2 A nitrogen with three groups and a lone pair is a base since it can accept a proton HNO3 has N as the central atom so it is a base

Explanation:

The answer choices are:

1. Metals in the second group make bases of the form M(OH)₂

TRUE

The metals in the second group have two valence electrons, thus they can lose them to form cation with +2 oxidation state and bond with two (OH)⁻ groups, forming bases with the general formula M(OH)₂.  For instance, Mg(OH)₂ and Ca(OH)₂.

2.  Ammonium is an example of a "Nitrogen with 3 groups" base

FALSE

Ammonium is NH₃. The "nitrogen with 3 groups" base are the compounds where the three hidrogens are replaced with R-groups, where R are alkyl groups.

3. Metals in the first group make bases of the form M(OH)₂

FALSE

Since metals in first group of the periodic table have one valence electrons they make bases of the form MOH. For instance, NaOH and KOH.

4. A nitrogen with three groups and a lone pair is a base since it can accept a proton

TRUE

Since nitrogen has five valence electrons, when it bonds to three groups, it will retain a lone pair of electrons which make it a base under the Lewis concept and can accept a proton.

5. HNO₃ has N as the central atom so it is a base

FALSE

It is true that N is the central atom in HNO₃ but this compound is an acid as it releases a proton in aqueous solution.

answer: c. the experiment shows that the red substance experienced a chemical change.

explanation: chemical change is the change in which chemical composition of the substance changes. physical change is the change in which there is no change in chemical composition.

chemical changes are accompanied by following changes:

a) precipitate formation

b) energy is released or absorbed

c) formation of bubbles

d) change in color

as it is given that the red color has disappeared and there is production of gas, it means the red substance has undergone a chemical change.

e

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