Chemical Compounds and Formulas
Classified in Chemistry
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Classified in Chemistry
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The mole concept is an International System unit of measurement for a substance. It is also represented by carbon-12, and 1 mole is equal to Avogadro's number (6.022 x 10^23).
We use the periodic table to get values for given elements in a reaction to obtain their atomic values. We can then use these values for conversion from grams to moles or moles to grams in stoichiometric-based problems (gram/mole, mole-gram conversions).
Heat is the energy that flows between a system and its surroundings due to a difference in temperature.
Enthalpy is equivalent to the total heat content of a system.
Because... Continue reading "Principles of Chemistry: From Stoichiometry to Molecular Orbital Theory" »
Classified in Chemistry
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The study of the composition, structure, and properties of matter.
The study of the principles of matter and energy.
The study of Earth and its neighbors in space.
A measure of the amount of matter.
Anything that has mass and takes up space.
The smallest unit of an element.
A pure substance that cannot be broken down into simpler substances, made up of atoms.
Made up of elements and can be broken down into simpler substances.
Classified in Chemistry
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Ionic bonds form when electrons are transferred between atoms, resulting in positively charged cations (+) and negatively charged anions (-).
Covalent bonds form when atoms share electrons. This can be visualized by connecting the dots in Lewis structures.
Classified in Chemistry
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Tension is a type of stress that a structural element experiences when subjected to two equal and opposite forces pulling outwards along the same axis.
These forces:
If these forces deform the element, it will stretch. If the element fails, it will break in the middle, perpendicular to the force direction.
Compression is a type of stress that a structural element experiences when subjected to two equal and opposite forces pushing inwards along the same axis.
These forces:
If these forces deform the element,... Continue reading "Structural Element Behavior Under Different Forces" »
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- Without H20 being polar, there would be no life on Earth, and Earth will be very dry. Humans and living organisims depend on H20 and it's polarity to sustain life on Earth because h20 wouldnt be able to form hydrogen bonds because it isnt polar. Animals who depend on ice such as polar bears and seals wold not be able to live due to ice not floating on the surface of water. When ice lacks crystal lattice structure, it starts to drown, and this happens due to the lack of hydrogen bonding. Therefore, h20 is very important for life to exist on earth.
- h-h: nonpolar covalent bond
- p-cl: covalent
- na-br: ionic
Electronegativity: 0->0.4 = covalent, 0.5->1.7=polar covalent, more than 1.7= ionic bonds, minus the EN
- Ion-induced dipole force:
... Continue reading "Coh3 structure" »Classified in Chemistry
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Example: Molten sodium chloride:
Aqueous solution of sodium chloride:
Positively charged ions move to the negative electrode during electrolysis. They receive electrons and are reduced.
Negatively charged ions move to the positive electrode during electrolysis. They lose electrons and are oxidized.