chemical equations. * To interpret chemical reactions. * To understand equilibrium reactions and the factors that can affect them. * Molecular Mass / Formula Mass * Is the sum of the atomic masses of all the atoms present in one molecule of that compound. Example: the molecular mass of sodium bromide‚ NaBr‚ is 103‚ which represents the sum of the atomic mass of sodium (23) plus that of bromide (80). * Calculating the Molecular Mass (Formula Mass) of a Compound * To find
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temperature outside affect how fast molecules move inside objects? Charles Law helps us understand how molecules move in different temperatures. It states that increasing the temperature of a constant pressure volume of gas causes individual gas molecules to move faster (Andrew Staroscik Staroscik 9/19/16)‚ and the volume is proportional to the absolute temperature of a gas at (Todd Helmenstine 10/16/16). Therefore‚ as the temperature increases‚ so does the speed of the molecules‚ and when the temperature
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Structures 29 Use with Chapter 8‚ Section 8.3 1. Step 1 in drawing the Lewis structure for a molecule is to decide which atoms of the molecule are most likely the terminal ones. In the transparency‚ why are the hydrogen (H) atoms in hydrazine (N2H4) shown as the terminal atoms? 2. Step 2 in drawing a Lewis structure involves determining the total number of valence electrons in the atoms in the molecule. Explain why the total number of valence electrons in N2H4 is 14. 3. Step 3 in drawing a
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POLAR-The opposite ends of the molecule have opposite charges **attraction between polar molecules **hydrogen bonding orders molecules into structural organization Non-Polar-Substances that are hydrophobic/water fearing. They do not dissolve well and cannot bond. They share electrons perfectly‚ therefore have no difference in charge. Ex: oil‚ gum‚ wax‚ sand‚ plastic. Adhesion-Something’s ability to stick to other molecules Cohesion- The ability of the molecules to bond to themselves. (hydrogen
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carbons +1.008x12 hydrogens + 16= 148.09 09 g mol -1. From this knowledge the unknown molecule must include either an alcohol‚ aldehyde‚ ketone‚ ether or methoxy- functional group. Secondly it is important to calculate the degrees of unsaturation in the molecule. The degrees of unsaturation
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Here‚ the ammonium nitrate compound absorbs heat from the water molecules in order to dissolve into ions of ammonium and nitrate. This absorption of heat is what causes the ice pack to get cold. This is the opposite of an exothermic reaction‚ in which heat is released from the system rather than absorbed. The chemical reaction that takes place in cold packs is also a decomposition reaction‚ as the heat causes the ammonium nitrate molecule to decompose into ions‚ thus making ammonium nitrate soluble
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properties are often superior to those of their component elements. 8.1-Molecular Compounds Molecular compounds tend to have relatively lower melting and boiling points than ionic compounds. A molecular formula shows how many atoms of each element a molecule contains. 8.2-Covalent Bonding In covalent bonds‚ electron sharing usually occurs so that atoms attain the electron configurations of noble gases. An electron dot structure such as H:H represents the shared pair of electrons of the covalent bond
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Most people have heard of the more common states of matter: solids‚ liquids‚ and gases. Fewer people know that there are actually more states of matter‚ including the fourth and fifth states: plasma and the Bose-Einstein Condensate‚ or BEC. The plasma and Bose-Einstein Condensate states of matter‚ while having some similarities‚ are two completely different forms of matter and connect with the Kinetic Molecular Theory in differing ways. Plasma is the fourth state of matter. It’s a fluid‚ gas-like
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chemistry is a branch of chemistry that uses principles of computer science to assist in solving chemical problems. It uses the results of theoretical chemistry‚ incorporated into efficient computer programs‚ to calculate the structures and properties of molecules and solids. Its necessity arises from the well-known fact that apart from relatively recent results concerning the hydrogen molecular ion (see references therein for more details)‚ the quantum many-body problem cannot be solved analytically‚ much
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and gas. The molecules in solid water are attracted insubstantially to each other. The molecules are organized in a crystalline structure. The energy of ice molecules is not very abundant. The molecules do not move they only vibrate. When heat is added to ice‚ the molecules vibrate faster than when they were in a solid state‚ the attractions are broken allowing the molecules to move somewhat freely. This occurs because of the addition
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