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Example: Balanced Chemical Equations with Subscripts Water: $$\ce{H2O}$$ Carbon dioxide: $$\ce{CO2}$$ Iron(III) hydroxide (Rust reaction): $$\ce{4Fe + 3O2 + 6H2O -> 4Fe(OH)3}$$ Copper(II) sulfate pentahydrate: $$\ce{CuSO4 * 5H2O}$$ Chemical Formulas in Chemistry Chemical formulas are the symbolic representations of chemical substances. They show the elements present in a compound and the ratio in which the atoms of these elements combine. Chemical formulas are essential for understanding the composition, structure, and behavior of compounds in chemical reactions. 1. What is a Chemical Formula? A chemical formula uses symbols of elements and numerical subscripts to represent the composition of a substance. For example, the formula for water is: $$ \ce{H2O} $$ This indicates that each water molecule is made up of 2 atoms of hydrogen and 1 atom of oxygen. 2. Types of Chemical Formulas Empirical Formula Molecular Formula Structural Formula...
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Javascript Snippet to store friends name in an array

// Array of friends created to store friends name 

const friends = ["Amit", "Sonu", "Monu", "Gonu", "Salu"];

const question = {
    prompt: "Which friend is not included in the array?",
    options: ["Amit", "Sonu", "Monu", "Gonu", "Saluu"], // Note the extra "u" in "Saluu" to create a wrong answer
    correctAnswer: "Saluu"
};

console.log(question);

This code creates an array friends containing the names of your friends. It then defines a question object with a prompt, options, and the correct answer. The prompt asks which friend is not included in the array. The options include the correct answer "Saluu" with an extra "u" to make it incorrect, and the other friends' names as correct options.

Let's go for another aspect of this problem , suppose we have this question .

Question: Which friend is not included in the array ["Amit", "Sonu", "Monu", "Gonu", "Salu"]?
Options:
A. Amit
B. Sonu
C. Monu
D. Gonu
E. Saluu
Correct Answer: E. Saluu

const friends = ["Amit", "Sonu", "Monu", "Gonu", "Salu"];

const question = {
    prompt: "Which friend is not included in the array?",
    options: ["Amit", "Sonu", "Monu", "Gonu", "Saluu"], // Note the extra "u" in "Saluu" to create a wrong answer
    correctAnswer: "Saluu"
};

console.log(question);

This code creates an array friends containing the names of your friends. It then defines a question object with a prompt, options, and the correct answer. The prompt asks which friend is not included in the array. The options include the correct answer "Saluu" with an extra "u" to make it incorrect, and the other friends' names as correct options.

const friends = ["Amit", "Sonu", "Monu", "Gonu", "Salu"];

//Code snippet to access element from array 
const question = {
    prompt: "Which code will get 'Sonu' from the array?",
    options: [
        "friends[0]",
        "friends.length - 1",
        "friends[1]",
        "friends['Sonu']"
    ],
    correctAnswer: "friends[1]"
};

console.log(question);

This code creates an array friends containing the names of your friends. It then defines a question object with a prompt, options, and the correct answer. The prompt asks which code will get "Sonu" from the array. The options include the correct answer friends[1], which accesses the second element in the array, and incorrect options that either access the wrong index or use an invalid syntax.




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