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Ionic and covalent bond

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Introduction

Notes for test of Unit 1 Atoms in a Solid, Liquid, Gas Compounds * Compounds are 2 or more elements chemically combined * The properties of a compound are different from the elements it has been made from When a compound forms: * The substances chemically react to form a new compound * The composition of a new compound is always the same * The properties of the new compound are very different from its element * The compound cannot be easily separated In a chemical reaction: * New chemical substances are formed * Generally the process is not easily reversed * Energy is often given out Diffusion * Diffusion involves the movement of particles from a region of higher concentration towards a region of lower concentration. Eventually the particles are evenly spread and the concentration is equal. ...read more.

Middle

* The bond is formed by sharing electrons between two atoms * H2O is a covalent bond Ionic bond * When two ions have opposite charges and they attract each other. The force between them is strong. * The bond is formed by giving electrons * When you give a electron your charge become positive and if you take your charge becomes negative Organic molecules * Carbohydrates are composed from carbon, hydrogen, and oxygen * They are found in all fruits, breads, milk, and pasta. * We need to eat carbohydrates because they are a source of energy * Monosaccharides: simple monomers such as glucose * Disaccharides: two monosaccharides added together such as sucrose * Carbohydrates are made of units called monosaccharides * M+M=Disaccharide * M+M+M+M+M+M+M+M etc.. = Polysaccharide like starch and cellulose which is made by plants and glycogen, which is made by animals * Lipids is a new name for fat * Lipids are composed of carbon, hydrogen, and oxygen * They are found in dairy products, oils, crips, butter, olives etc... ...read more.

Conclusion

* Protons + neutrons = mass number * If you know the atomic number than you also know the number of electrons * Same atoms with different atomic masses are called isotopes * A mixture is when you mix elements, but are not chemically combined. You can seperate them by physical methods such as crystalization, filtration, and ..... (something with magnets) * All matter is made up of very small particles * The particles are moving all the time * Heavier particles move more slowly than lighter ones at the same temperature * The space between particles can be called the inter-molecular space * Electrons are a negative charge * Protons are a positive charge * Water with salt, sugar or any other stuff in it will decrease the freezing point and the boiling point will increase ?? ?? ?? ?? ...read more.

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