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the science of matter and the transformation it can undergo |
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what is the name of the anticancer drug we talked about? |
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what tree has cancer-fighting abilities |
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what is the active chemical in the yew bark that helps fight cancer |
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why is the yew bark a poor source? |
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removing bark kills the tree and it takes 6 100 yr. old trees to treat one patient |
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whhat was the new source found to get paclitaxel from? |
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English yew needle (common, fast growing, doesn't kill tree) |
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how does paclitaxel work? |
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hinders cell division so cancerous cells won't multiple fast as they normally would |
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paclitaxel prevents _____ breakdown and binds in a pocket of ______ |
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name one other more effective drug than paclitaxel? |
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a tentative idea to explain observations |
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summarizes a large number of experiments |
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a unifying principle to explain a body of facts and the laws based on them |
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physical properties can be measured by changing the ______ of a substance |
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the same substance is present before and after this |
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3 things that may change in a physical change |
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1. physical state 2. gross shape (copper wire flat) 3. shape (cut wood in two) |
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measures relative energy content of an object |
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temperature measures relative _______ of an object |
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energy transfers from _____ temp. to ____ temp. |
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water freezes... water boils... normal body temp.... |
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canceling units to get desired units and using numbers and units to check |
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a chemical reaction that a substance can undergo |
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reactant atoms rearrange into different substances |
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the capacity to do work or make something happen |
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two or more substances in the same phase that are completely uniform |
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properties in one region differ from the properties in another region (microscope may be needed) |
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mixtures can be separated by _______ methods |
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most substances are ______ |
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2+ atoms from 2+ elements is what |
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compounds have a specific _______ and ______ |
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composition and properties |
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what cannot be decomposed into new substances |
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objects can be seen, measured and handled without aids |
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objects can be seen with a microscope |
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matter consists of tiny particles in constant motion |
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all matter is made up of extremely small atoms |
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all atoms of a given element are chemically _______ |
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atoms are not _______, _____ or ______ during a chemical reaction |
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created, destroyed, or converted into other kinds of atoms |
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more than how many elements are currently known? |
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how many elements occur naturally on earth? |
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name 4 properties of metals |
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solid (except Hg) conduct electricity ductile (draw into wires) malleable (roll into sheets) |
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two or more different physical forms in which an element can exist |
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name three allotropes of carbon? |
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.Graphite, charcoal, and diamond |
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this shows the number and types of atoms in a molecule or relative ratio of the atoms in a compound |
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how reactants convert into products |
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2 properties of nonmetals |
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occur in all states do not conduct electricity |
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what is the one and only nonmetal that conducts electricity |
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exhibit metallic and nonmetallic properties |
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what do metalloids look like? |
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when it comes to electricity, metalloids are what |
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semiconductors; do conduct electricity, but not as well as metals |
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most _____ elements form molecules |
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all compounds are ____ but not all _____ are compounds |
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all compounds are ____ but not all _____ are compounds |
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different forms of elements with the same T, P, and phase |
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