The model is made of an ionic compound of aluminum and chlorine. Aluminum has an oxidation number of 3 and chlorine has an oxidation number of -1. Based on the evidence, predict the chemical formula, chemical name and properties of the compound between aluminum and chlorine.

                    Chemical Formula: AlCl₃

                    Chemical Name: Aluminium Chloride

                    Properties are given below.

Explanation:

Chemical Formula:

                              Chemical formula depicts the total number of elemants forming a particular compound. It is common that all compounds are neutral in nature despite of the internal charges they contain. As given Aluminium has a + 3 charge while Chlorine has a -1 charge, therefore, to make a neutral compound we will require 3 Cl⁻ ions to neutralize one Al³⁺ ion hence, the chemical formula will be AlCl₃.

Chemical Name:

                              According to rules ionic compounds are named by naming the positive part first followed by negative part. In this case Al³⁺ being is name d first followed by Cl⁻ (remember the -ine in anions is replaced by -ide) hence, this compound will be name as Aluminium Chloride.

Properties:

                 Few physical and chemical properties of AlCl₃ are;

 (i) It melts at 192.4 °C

 (ii) Highly Soluble in water

 (iii) It has a density of  2.48 g/cm³

 (iv) Poor conductor of electricity

 (v) It is used as catalyst in many organic reactions

 (vi) Reacts with silver nitrate to form silver chloride and Aluminium Nitrate

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

this is chemical change (chemical reaction), because two new substances are formed (metalig liquid and gas), the atoms are rearranged and the reaction is followed by an energy change.

this is example of chemical decomposition.

chemical decomposition (analysis) is the separation of a single chemical compound into its two or more elemental parts or to simpler compounds.  

chemical decomposition is opposite of chemical synthesis.

answer: e.   sour taste

explanation: acids are those substances which dissociates in water to give ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. acids are sour in taste. example: hcl

bases are those substances which dissociates in water to give ions or accepts ions. as they dissociate to give ions, they act as electrolytes and thus are electrically conductive. bases are bitter in taste. bases are slippery in nature.