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Dalton’s atomic theory stated that every element is made of particles called atoms cant be same number of valence electrons. Valence electrons determine an electrons properties. Ionizations is the process of adding or removing electrons. An atoms atomic mass number equals the protons plus the number of neutrons. Alkali metals are extremely reactive because it has one valence electron. Semiconductors are elements that can conduct heat and electricity under certain conditions. Most halogens form compounds by adding a valence electron to form a negative ion. Carbon and non-metals are found in the middle column. A mol is an SI base unit that describes the amount of a substance. Molar mass is defined as mass of one mole of a pure substance. The forces that hold different atoms and ions together are chemical bonds. A mixture is different from a compound because each substance in a mixture is chemically unchanged. A compound differs from a mixture because retains its properties. Gases take up a lot of space because they have very little reaction. Often atoms join so that atoms will have a full outermost energy level. An ionic bond is a bond that forms between oppositely charged ions. Covalent bonds are formed between nonmetals. Copper is good conductor of electricity because its electrons can move freely between atoms. In a covalent bond atoms share electrons. An anion formed from an oxygen atom is called an oxide ion. Carbon atoms have 4 valence electrons. Simplest organic compound is methane. Alkanes are hydrocarbons that contain single covalent bonds. Alcohols are organic compounds that contain oxygen, carbon, and hydrogen. Polymers are large organic molecules that are made up of many smaller bonded units. A protein is a polymer that is made up of amino acids. A change in color such as rusting in metal is a sign of a chemical reaction. Substance that undergoes a change in a chemical reaction is a reactant. Chemical reactions are substances that undergo chemical change and form new substances. Exothermic reactions- energy is transferred from reactant to surroundings usually as heat. Chemical energy is energy that is stored within atoms and molecules. Decomposition example digestion. In a redox reaction the substance that accepts electrons is said to be reduced. In a balanced reaction the total mass of the products always equal the mass of the reactants. Acceleration is defined as the change in velocity divided by time. SI unit for acceleration is m/s (squared). Combination acting on all the forces on an object is net force. Tug- of- war unbalanced forces. Friction is defined as the force between two objects in contact that opposes the motion of either object. Weight is gravitational pull on an object. Objects that are moved farther apart has reduced gravity. The greatest gravitational force would occur between the moon and the earth. Unbalanced forces on an object equals the objects mass times its acceleration is Newton’s Second Law. Every object maintains constant velocity unless acted on by another force Newton’s First Law. Every action force there is an equal and opposite reaction force Newton’s Third Law. Unit to measure acceleration in free fall m/s (squared). When air resistance balances the weight of an object that is falling the velocity becomes constant. Units of power all of the above. A machine- that multiplies and changes and input force. First class lever – fulcrum in the middle. A wheelbarrow is an example of a second class lever. Hand held boat paddle – third class lever. Pair of scissors not a simple machine. Single fixed pulley MA= 1. Single moveable pulley MA= 2. Wheel and axle – screwdriver. An inclined plane alters the magnitude and direction. Pliers is a compound machine. Temperature is all of the above. Kinetic energy of the molecules in a substance increases the temperature. Transfer of energy as heat caused by collision of molecules is conduction. Transfer of energy by movement of fluid or gases with different temps is convection. Convection currents rise in air because hot air rises. Transfer of matter without movement is radiation. Farienheit scale 212 boil, 32 freeze. Repulsive force alike signs. Attractive force is different signs. Electric force between a charged object are the force of attraction. Electric force varies on charge and distance. Potential difference is measured in volts. Resistance is caused by internal friction. SI unit of resistance is amps. The resistance of an insulator is high. I love you jay. NOW LET ME GO TO SLEEP!! GOOD LUCK BABY! :] to superscript: select text, right click, go to font,the click the box "subscript" to do margins: file, page setup, then you can figure it out :] _________________________________________________________________ Express . Ionizations is the process of adding or removing electrons. An atoms atomic mass number equals the protons plus the number of neutrons. Alkali metals are extremely reactive because it has one valence electron. Semiconductors are elements that can conduct heat and electricity under certain conditions. Most halogens form compounds by adding a valence electron to form a negative ion. Carbon and non-metals are found in the middle column. A mol is an SI base unit that describes the amount of a substance. Molar mass is defined as mass of one mole of a pure substance. The forces that hold different atoms and ions together are chemical bonds. A mixture is different from a compound because each substance in a mixture is chemically unchanged. A compound differs from a mixture because retains its properties. Gases take up a lot of space because they have very little reaction. Often atoms join so that atoms will have a full outermost energy level. An ionic bond is a bond that forms between oppositely charged ions. Covalent bonds are formed between nonmetals. Copper is good conductor of electricity because its electrons can move freely between atoms. In a covalent bond atoms share electrons. An anion formed from an oxygen atom is called an oxide ion. Carbon atoms have 4 valence electrons. Simplest organic compound is methane. Alkanes are hydrocarbons that contain single covalent bonds. Alcohols are organic compounds that contain oxygen, carbon, and hydrogen. Polymers are large organic molecules that are made up of many smaller bonded units. A protein is a polymer that is made up of amino acids. A change in color such as rusting in metal is a sign of a chemical reaction. Substance that undergoes a change in a chemical reaction is a reactant. Chemical reactions are substances that undergo chemical change and form new substances. Exothermic reactions- energy is transferred from reactant to surroundings usually as heat. Chemical energy is energy that is stored within atoms and molecules. Decomposition example digestion. In a redox reaction the substance that accepts electrons is said to be reduced. In a balanced reaction the total mass of the products always equal the mass of the reactants. Acceleration is defined as the change in velocity divided by time. SI unit for acceleration is m/s (squared). Combination acting on all the forces on an object is net force. Tug- of- war unbalanced forces. Friction is defined as the force between two objects in contact that opposes the motion of either object. Weight is gravitational pull on an object. Objects that are moved farther apart has reduced gravity. The greatest gravitational force would occur between the moon and the earth. Unbalanced forces on an object equals the objects mass times its acceleration is Newton’s Second Law. Every object maintains constant velocity unless acted on by another force Newton’s First Law. Every action force there is an equal and opposite reaction force Newton’s Third Law. Unit to measure acceleration in free fall m/s (squared). When air resistance balances the weight of an object that is falling the velocity becomes constant. Units of power all of the above. A machine- that multiplies and changes and input force. First class lever – fulcrum in the middle. A wheelbarrow is an example of a second class lever. Hand held boat paddle – third class lever. Pair of scissors not a simple machine. Single fixed pulley MA= 1. Single moveable pulley MA= 2. Wheel and axle – screwdriver. An inclined plane alters the magnitude and direction. Pliers is a compound machine. Temperature is all of the above. Kinetic energy of the molecules in a substance increases the temperature. Transfer of energy as heat caused by collision of molecules is conduction. Transfer of energy by movement of fluid or gases with different temps is convection. Convection currents rise in air because hot air rises. Transfer of matter without movement is radiation. Farienheit scale 212 boil, 32 freeze. Repulsive force alike signs. Attractive force is different signs. Electric force between a charged object are the force of attraction. Electric force varies on charge and distance. Potential difference is measured in volts. Resistance is caused by internal friction. SI unit of resistance is amps. The resistance of an insulator is high. I love you jay. NOW LET ME GO TO SLEEP!! GOOD LUCK BABY! :] to superscript: select text, right click, go to font,the click the box "subscript" to do margins: file, page setup, then you can figure it out :] _________________________________________________________________ Express yourself instantly with MSN Messenger! Download today - it's FREE! http://messenger.msn.click-url.com/go/onm00200471ave/direct/01/
