Parantheses mean present of a subgroup or a group of polyatomic ions in a chemical reaction.
<u>Explanation:</u>
In a chemical reaction, sometimes, a compound may be composed of group of polyatomic ions with other ions. Some of the polyatomic ions are sulfate, carbonate, nitrate, hydroxide, bicarbonate, ammonia etc.
So these polyatomic ions are formed by combining two or more elements. Thus, if the number of polyatomic ions in a compound is more than one, then we use parathesis and write those polyatomic ions in it and write the number of polyatomic ions present in the compound as subscript of the parathesis.
For example, Fe₂(SO₄)₃
So here SO₄ is a polyatomic ion and in the compound 3 atoms of SO₄ is required to neutralize the compound and thus paranthesis is used. Thus, parantheses mean present of a subgroup or a group of polyatomic ions in a chemical reaction.
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As a chemical reaction occurs and the thermometer in the container records a decrease in temperature, the statement that is true about the reaction is: <span>The reaction is endothermic because heat was taken in by the reaction.
Endothermic reactions are those that require energy in the form of heat to be completed. Technically, in these reactions, the enthalpy of the products is higher than the enthalpy of the products. The requirement of energy causes the temperature to decrease. A general expression for an endothermic reaction can be written in the following way:
A + </span>Δ → B (Where Δ means heat)
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Answer: The chemical formula for the formula given in the image is 
.
Explanation: There are many ways in which a model can be represented:
- Molecular Formula
- Ball and Stick formula
- Expanded Formula
- Condensed Formula
- Skeletal Formula
This molecule is represented by the Expanded Structural Formula and by seeing in the image we can count the number of each element present.
Number of Carbon atoms present = 4
Number of Hydrogen atom present = 9
Number of Oxygen atom present = 2
Correct representation for this will be .
Answer:
Here's what I get
Explanation:
There are two methods of naming esters.
(a) Common names
alkyl alcohol + carboxylic acid ⟶ alkyl carboxylate
To form the name of an ester, you drop the alcohol and -ic acid ending from the names of the reactants.
The name of the ester consists of two words: the name of the alcohol followed by the acid name with the ending -ate.
(b) IUPAC (systematic) names
alkanol + alkanoic acid ⟶ alkyl alkanoate
To form the name of an ester, you drop the -anol and -ic acid endings from the names of the reactants.
The name of the ester consists of two words with the corresponding endings -yl and -ate.
You don't mix the common and IUPAC systems in the same name.
1. ethanol + benzoic acid ⟶ ethyl benzoate
2. benzyl alcohol + acetic acid ⟶ benzyl acetate
3. butanol + butanoic acid ⟶ butyl butanoate (IUPAC)
butyl alcohol + butyric acid ⟶ butyl butyrate (common)
4. pentanol + propanoic acid ⟶ pentyl propanoate (IUPAC)
n-pentyl alcohol + propionic acid ⟶ n-pentyl propionate (common)
5. isopropyl alcohol + formic acid ⟶ isopropyl formate
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