Malasia Robertson-04 period
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Chemical changes occur when new substances are formed with different chemical properties, while physical changes alter the form or phase of a substance without changing its chemical makeup. Mixing baking soda and vinegar is an example of a chemical change, while freezing water into ice illustrates a physical change since it alters the state but not the chemical composition of H2O.
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Physical changes alter the form or phase of a substance without changing its chemical composition, such as boiling water. Chemical changes create new substances through chemical reactions, like mixing baking soda and vinegar. An example of a physical change is boiling water, while mixing baking soda and vinegar demonstrates a chemical change through a chemical reaction that alters the original substances.
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Chemical and physical changes are different types of changes that substances can undergo. Chemical changes involve breaking chemical bonds to form new substances with different properties, such as when baking soda and vinegar are mixed. Physical changes alter the shape or form of a substance without changing its chemical makeup, like tearing a piece of paper. The document provides examples of chemical changes, like baking soda and vinegar reacting, and physical changes, such as tearing paper.
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This document discusses the differences between physical and chemical changes. A physical change is when a substance changes states, like ice melting into water, without altering its chemical makeup. A chemical change involves a reaction that changes the atomic or molecular structure of the substances, like an explosion from fireworks which is a chemical reaction. The document provides definitions and examples to illustrate the key differences between physical and chemical changes.
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2.3 Notes
Chemical properties can only be observed when a substance changes into a different substance through chemical reactions. Common chemical properties include flammability, which is a substance's ability to burn, and reactivity, which is how readily it combines with other substances. Chemical changes can be identified by a change in color, production of a gas, or formation of a precipitate, and result in a change to the composition of the substance.
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Chemical and physical changes can be distinguished based on whether changes occur at the molecular level or involve energy and states of matter. Physical changes alter the shape or state of matter of a substance without changing its chemical composition, such as crushing a can or melting ice. Chemical changes involve transformations of molecular structure and composition through breaking and forming of chemical bonds, such as rusting of iron or burning of sugar. While some changes are obvious, others occur at the microscopic level of molecular structure and bonding.
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A physical change can be reversed and only alters the shape or form of the material, while a chemical change produces new substances that cannot be reversed back to the original forms. Toasting bread and burning wood are examples of chemical changes, as the original substances cannot be recovered, while shaping clay into pots is a physical change since it remains clay just in a different shape. Determining if a change is physical or chemical is not always clear cut and may require microscopic examination in some cases.
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The document discusses several key chemical and physical processes:
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This document discusses the differences between physical and chemical changes. Physical changes alter the phase or form of a substance without changing its chemical properties, such as a snowman melting. Chemical changes produce new substances with different chemical properties, like iron reacting with oxygen to form iron oxide or a spring rusting away.
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2. melting point (P)
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This document discusses physical and chemical changes in matter and provides examples to help students understand the key differences:
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Cosa hanno in comune un mattoncino Lego e la backdoor XZ?
ABSTRACT: A prima vista, un mattoncino Lego e la backdoor XZ potrebbero avere in comune il fatto di essere entrambi blocchi di costruzione, o dipendenze di progetti creativi e software. La realtà è che un mattoncino Lego e il caso della backdoor XZ hanno molto di più di tutto ciò in comune.
Partecipate alla presentazione per immergervi in una storia di interoperabilità, standard e formati aperti, per poi discutere del ruolo importante che i contributori hanno in una comunità open source sostenibile.
BIO: Sostenitrice del software libero e dei formati standard e aperti. È stata un membro attivo dei progetti Fedora e openSUSE e ha co-fondato l'Associazione LibreItalia dove è stata coinvolta in diversi eventi, migrazioni e formazione relativi a LibreOffice. In precedenza ha lavorato a migrazioni e corsi di formazione su LibreOffice per diverse amministrazioni pubbliche e privati. Da gennaio 2020 lavora in SUSE come Software Release Engineer per Uyuni e SUSE Manager e quando non segue la sua passione per i computer e per Geeko coltiva la sua curiosità per l'astronomia (da cui deriva il suo nickname deneb_alpha).
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