5-05-2021, 04:10
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In chemistry, electronegativity is a measure of how strongly an atom attracts the electrons in a bond. An atom with high electronegativity attracts electrons strongly, while an atom with low electronegativity attracts them weakly. Electronegativity values are used to predict how different atoms will behave when bonded to each other, making this an important skill in basic chemistry.
2-04-2021, 13:30
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The mass percent composition of a molecule is the percent contribution of each individual element to a molecule's mass. Percent of mass of one element in a compound is expressed as a ratio of mass contribution to the element and the total molecular mass of the compound multiplied by 100%. It sounds complicated, but finding the mass percent is actually a simple process!
2-03-2021, 08:10
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Many chemical substances are available in a dissolved liquid form, rather than a solid form. Liquid chemicals are easier to dispense and measure than solid ones, especially since the solid form is usually a powder. However, the stoichiometry of chemical reactions is complicated by the liquid delivery method. Stoichiometry performs calculations using the amount of the desired substance
29-01-2021, 15:30
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Total dissolved solids (or TDS) is the measure of all organic and inorganic substances dissolved in a given liquid, revealing the proportion of different solids. There are a number of different uses for TDS: it can measure pollution levels in lakes and rivers or mineral levels in drinking water, for example, and also has agricultural applications in irrigation. To calculate the TDS for
21-01-2021, 16:20
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Thermal conductivity is the measure of a sample’s ability to conduct heat. It is most often used in physics and is useful in determining how a material conducts electricity. To measure thermal conductivity, use the equation Q / t = kAT / d, plug in your area, time, and thermal constant, and complete your equation using the order of operations.
4-12-2020, 21:40
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Moles are a standard unit of measurement in chemistry that take into account the different elements in a chemical compound. Often, amounts of compounds are given in grams and need to be converted to moles. This conversion can help give you a clearer picture of the number of molecules you're working with rather than dealing with weight, which can change between molecules. Although the
23-10-2020, 05:10
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Bond energy is an important concept in chemistry that defines the amount of energy needed to break a bond between a covalently bound gas. This type of bond energy does not apply to ionic bonds. When 2 atoms bind together to form a new molecule, it is possible to determine how strong the bond between atoms is by measuring the amount of energy needed to break that bond. Remember, a single
15-10-2020, 07:50
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During any chemical reaction, heat can be either taken in from the environment or released out into it. The heat exchange between a chemical reaction and its environment is known as the enthalpy of reaction, or H. However, H can't be measured directly — instead, scientists use the change in the temperature of a reaction over time to find the change in enthalpy over time (denoted as ∆H).
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