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NEET 2025 | All Graphs Of Chemistry | 16 Marks Guaranteed | Wassim Bhat

Unacademy NEET English・2 minutes read

Understanding and drawing graphs in chemistry for NEET 2025 is emphasized, covering various equations and their corresponding graph types, including slopes, intercepts, and curve natures. The session provides detailed explanations and examples of graph plotting, along with equations to determine graph characteristics, aiming to enhance students' comprehension of chemistry concepts and graph representation for the upcoming exam.

Insights

  • Understanding graph plotting in chemistry involves various types of equations like Y = MX, Y = MX + C, Y = MX - C, Y = -MX + C, and XY = constant, each with distinct characteristics and graph shapes based on the slope, intercept, and nature of the equation.
  • Graph plotting in chemistry extends to various topics like Boyle's Law, relationships between pressure, volume, temperature, and energy in different equations, illustrating parabolic, hyperbolic, and linear curve shapes that provide insights into chemical reactions and physical properties.

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Recent questions

  • What is the equation for a straight line graph passing through the origin?

    Y = MX

  • How is the intercept represented in a straight line graph above the origin?

    Y = MX + C

  • What is the equation for a straight line graph starting below the origin?

    Y = MX - C

  • How is a graph with a negative slope starting above the origin represented?

    Y = -MX + C

  • What type of graph results from plotting variables inversely proportional to each other?

    Rectangular hyperbola

Related videos

Summary

00:00

Graphs in Chemistry for NEET 2025 Prep

  • The session is focused on understanding and drawing graphs in chemistry, particularly for NEET 2025.
  • The first graph discussed is for the equation Y = MX, where M represents the slope, and the graph is a straight line passing through the origin.
  • The slope, M, is calculated as tan of Theta, with Theta being the angle the line makes with the positive x-axis in the anticlockwise direction.
  • An example given is Y = 3X, where the slope is 3, leading to a straight line passing through the origin.
  • The second graph type discussed is for the equation Y = MX + C, where C represents the intercept, and the graph is a straight line starting above the origin.
  • The distance from the origin to where the graph starts is the intercept, denoted by C.
  • An example provided is Y = 3X + 5, where the slope is 3, the intercept is 5, and the graph starts above the origin.
  • The third graph type is for the equation Y = MX - C, where the graph is a straight line starting below the origin due to the negative intercept.
  • An example given is Y = 5X - 3, where the slope is 5, the intercept is 3, and the graph starts below the origin.
  • The fourth graph type discussed is for the equation Y = -MX + C, where the slope is negative, leading to a straight line starting above the origin.
  • An example provided is Y = -5X + 3, where the slope is -5, the intercept is 3, and the graph starts above the origin.

17:32

Graph plotting and curve equations explained concisely.

  • The perfect tan of theta is 5, leading to theta being equal to tan inverse -5.
  • The distance from the origin to the starting point of a curve is called the intercept, denoted by C, with a value of three units.
  • The equation y = -mx + C is discussed, emphasizing the importance of understanding its format.
  • The fifth equation, in the format XY = constant or Y = k/X, is highlighted for graph plotting purposes.
  • Graph plotting between two variables inversely proportional to each other results in a rectangular hyperbola.
  • The nature of the curve for equations like Y = e^x and Y = e^-x is explained as exponential increase and decrease, respectively.
  • The graph for Y = Kx^2 is described as a parabola opening upwards.
  • Boil's Law is introduced, showing the relationship between pressure and volume in a rectangular hyperbola graph.
  • The process of graph plotting between P/V and 1/V is detailed, showcasing a straight line passing through the origin.
  • Graph plotting between volume and temperature, as well as volume and 1/temperature, is explained, highlighting the nature of the resulting graphs.

33:27

Graphs of Bohr's Orbit and Electron Energy

  • Plot a graph between VT and temperature, where VT = KT^2, showing a parabola opening upwards.
  • Discuss the nature of the curve between log of V and log of T, resulting in a straight line with a positive slope.
  • Analyze the value of M in the log P versus log T graph, indicating a slope of 1 and an intercept of log K.
  • Provide equations for various graphs: P versus T, P versus 1/T, PT versus T^2, PT versus T, P versus √T, and log P versus log T.
  • Explain the relationship between the radius of an nth Bohr's orbit and n^2, leading to a linear graph.
  • Illustrate the graph between radius of an nth Bohr's orbit and n, resulting in a parabola opening upwards.
  • Explore the graphs of radius of an nth Bohr's orbit versus Z and radius of an nth Bohr's orbit versus 1/Z, both showing hyperbolic curves.
  • Examine the graphs of energy of an electron in the nth Bohr's orbit versus Z and energy of an electron in the nth Bohr's orbit versus Z^2, displaying parabolic curves in different quadrants based on the presence of a negative sign.

50:03

Graph Characteristics in Chemical Kinetics Explained

  • When comparing n² and n², the curve's nature is hyperbolic due to the inverse proportionality of Y and X axes.
  • The graph of log of KP versus log of RT results in a straight line with a slope of Delta n and an intercept of log of KC.
  • Equations like a = a0e^-KT and T2 = a/2K are used in zero-order reactions, showcasing the relationship between variables.
  • Graphs between variables like a versus T and T2 versus a exhibit specific characteristics based on their equations.
  • The nature of graphs between Alpha and a is hyperbolic due to their inverse proportionality.
  • Various equations like log of a = log of a0 - k/2.303 * T are used in chemical kinetics to determine graph characteristics.
  • The graph between log of K and 1/T results in a straight line with a slope of -Ea/2.303R and an intercept of log of a.
  • The session emphasizes the ability to create graphs based on equations, providing a comprehensive understanding of graph characteristics.
  • Students are encouraged to join the Phoenix 2.0 NEET English batch for in-depth training in physics, chemistry, and biology.
  • Enrolling in the batch offers personalized mentorship, weekly tests, study materials, and complete syllabus coverage within six months.
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