Unknown Drawing Measurement
Unknown Drawing Measurement - Related Videos
15:03
Identification of Unknown Aldehydes and Ketones - Student Protocol
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2020
Source: Lara Al Hariri and Ahmed Basabrain at the University of Massachusetts Amherst, MA, USA DNPH Test for Aromatic Aldehydes and KetonesExpand In this lab, you'll use the DNPH test, the Tollens' test, and the iodoform test to identify two unknown aldehydes or ketones. You'll use butanone and benzaldehyde as known compounds to confirm that the tests are working as expected. You'll start the lab with the DNPH test, which relies on the reaction between 2,4-dinitrophenylhydrazine, or DNPH,...
06:48
Identification of Unknown Aldehydes and Ketones - Instructor Prep
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2020
Source: Lara Al Hariri at the University of Massachusetts Amherst, MA, USA Preparation of Test SolutionsExpand Here, we show the laboratory preparation for 10 students working in pairs, with some excess. Please adjust quantities as needed. Before you start, put on a lab coat, splash-proof safety glasses, and nitrile gloves. Note: DNPH is a shock explosive, so handle it gently with low friction tools. Phosphoric acid is also toxic and corrosive. Prepare 100 mL of a 0.1 M...
03:09
Identification of Unknown Aldehydes and Ketones - Concepts
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2020
Aldehydes and Ketones Aldehydes and ketones have a carbonyl group (C=O) as a functional group. A ketone has two alkyl or aryl groups attached to the carbonyl carbon (RCOR’). The simplest ketone is acetone, which has two methyl groups attached to the carbonyl carbon (CH3COCH3). An aldehyde is similar to a ketone, except that instead of two side groups connected to the carbonyl carbon, they have at least one hydrogen (RCOH). The simplest aldehyde is formaldehyde (HCOH), as it has two hydrogens...
08:53
Freezing-Point Depression to Determine an Unknown Compound
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2023
Source: Laboratory of Lynne O' Connell — Boston College When a solid compound is dissolved in a solvent, the freezing point of the resulting solution is lower than that of the pure solvent. This phenomenon is known as freezing-point depression, and the change in temperature is directly related to the molecular weight of the solute. This experiment is designed to find the identity of an unknown compound by using the phenomenon of freezing-point depression to determine its molecular weight. The...
06:22
Motor Learning in Mirror Drawing
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2023
Source: Laboratory of Jonathan Flombaum—Johns Hopkins University Colloquially, the terms learning and memory encompass a broad range of behaviors and mental systems, everything from learning to tie a shoe to mastering calculus (and a lot in between). Experimental psychologists have divided up learning mechanisms into groups that seem to have different properties, and that seem to rely on different brain systems. A major division is between declarative and non-declarative memory, roughly, the...
FAQs
Begin by identifying what each label represents and whether the diagram provides a scale. Then connect the unknown dimension to known lengths, angles, or shape properties. Proportions can relate a drawing measurement to a real-world measurement, while geometric relationships can link separate parts of the figure. This prevents isolated measuring from replacing mathematical reasoning.
A scale drawing preserves a stated relationship between diagram dimensions and the objects they represent, so measurements can be converted consistently. If the figure is not drawn to scale, its appearance may suggest incorrect lengths or angles. In that situation, labels, formulas, and geometric properties should control the solution rather than visual estimates.
Similarity is useful when figures share the same shape, because corresponding lengths maintain proportional relationships. Symmetry can show that certain lengths or angles are equal, reducing the number of independent measurements needed. Together, these properties allow a missing value to be inferred from related parts instead of measured directly from the illustration.
An unknown length is commonly addressed through a ruler, a scale, proportions, or a geometric formula, depending on the information shown. An angle requires attention to the figure’s angular labels, symmetry, or other geometric relationships. Selecting the correct approach matters because a tool-based reading and a calculated result may rely on different evidence in the diagram.
First, identify the unknown quantity and record the relevant labels or scale. Next, determine which geometric relationships, proportions, formulas, or measurement tools apply. Calculate or read the value, then compare it with the diagram and check whether the result is consistent with the stated dimensions. This sequence connects visual interpretation with numerical verification.
Maps and construction plans use represented dimensions to connect a drawing with a larger physical space. A stated scale allows a measured distance on the plan or map to correspond to an actual distance, while labeled angles and lengths describe spatial relationships. These applications show how diagram-based mathematics supports planning and interpretation beyond classroom figures.
Drawing measurement helps translate an object or spatial arrangement into a geometric representation with dimensions that can be examined numerically. Comparing labeled or measured features with the physical relationship they represent supports a model of the situation. The process links abstract geometry to real objects while also providing a way to check whether the diagram communicates those relationships accurately.