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| matter that makes up an object |
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| The production of heat when two substances are mixed might indicate that a |
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| chemical change is occuring |
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| less helium would be needed to fill a balloon on a |
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| an example of a chemical property is |
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| clouds are an example of a |
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| matter that consists of one type of atom or one type of molecule is a |
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| substance composed of a single kind of an atom is an |
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| a physical property that is a measure of the amount of matter in an object is |
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| matter that contains two or more pure substances is a |
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| substance made of atoms or two or more different elements joined by chemical bonds is called |
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| 99% of matter in the universe is |
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| __________ is larger than a decimeter |
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| the international system of units was first called |
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| The SI base unit for temperature is |
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| scientists express very large or small number |
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| mulitplied by 10 to the appropriate power |
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| another name for a change that takes place when bonds between atoms are broken or formed to make new substances in a |
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| the center of an atom is a dense region consisting of protons and neutrons called th |
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| what is the one place with temperatures high enough for nuclear fusion to happen? |
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| in Thompson's "plum-pudding" model of the atom, the plums represent |
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| an atom of gold with 79 protons 79 electrons and 118 neutrons would have a mass number of |
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| if an isotope of uranuim - 235 has 92 protons how many protons does uranium - 238 have? |
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how did Democriatus describes atoms ? |
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| if hydrogen -1 has one proton how many protons does hydrogen-2 have? |
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| have the same number of protons |
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| a neutral calcuim (CA) atom contains 20 protons 20 neutrons and 20 electrons. this atom becomes an ion when it loses two electrons. whut is the ion charge? |
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| the number of protons in the nucleus of an atom is the |
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| the sum of protons and neutrons in an atom are the |
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| mass of an atom expressed in atomic mass units is the |
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| the raised surfaces on Thompson's "plum-pudding" model are describing |
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| mendeleev found that properties of known elements followed a pattern that repeated every |
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| how would you describe most medals |
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| they can be drawn into thin wires |
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| medals that have two outer-level electrons are |
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| elements with radioactive atoms are |
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| very reactive non-medals are |
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| unreactive non-medals that dont react with other elements under normal conditions are |
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| medals in groups 3-12 that dont give away their electrons as easily as atoms of groups 1 & 2 are |
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| the number beneath carbon indicates the |
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the process by which a large nucleus splits into two smaller nuclei and releases energy is called |
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| how can large atoms be forced to undergo nuclear fission |
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| by hitting the atoms with neutrons |
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| the nuclear fission of the uranium in one fuel pellet releases as much as energy as burning |
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| a continuous series of nuclear fission reactions is called |
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| when two or more nuclei that have small masses combine, or fuse, to form a larger nucleus, it is called |
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| matter in which electrons have been removed from atoms is called |
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| instead of using kelvins, scientists often measure temperature in a unit called |
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| anything that has mass and takes up space is called |
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| we know that air is matter because |
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| the smallest unit of an element that maintains the properties of that element is |
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| a homogenous mixture that appears to be a single substance is an |
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| a characteristic of matter that can be ovserved or measured without the matter going through a chemical change is called |
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| a property of matter that describes a substance's ability to participate in chemical reactions and form new substances is called |
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| when baking soda and vinegar react to form bubbles of cabon dioxide, it is evidence of baking soda's |
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| the chemical property that indicates a substance can burn is |
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| the law of conservation of mass states that in ordinary chemical or physical changes |
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| energy is not created or destroyed |
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| what change occurs in a boulder when it erodes into sand? |
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| the chemical changes that occur when your body uses sugar |
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| obey the law of conservation of mass |
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| a change in which one or more substances change into entirely new substances with different properties is a |
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| another name for a change that takes place when bonds between atoms are broken or formed to make new substances is a |
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| particles in matter are always moving because they have |
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| whether a substance such as bromine is a solid,liquid,or gas its __________________________ are the same |
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| Democritus's theory about atoms is |
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| atoms are made of single material |
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| part of atom that is dense, postivily charged |
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| who thought " atoms of the same element are exactly alike" |
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| a way to increase the pressure of a gas in a container that cannot expand is to |
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| most chemicals are reversible. true or false |
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| the chemical changes that occur when your body uses sugar is |
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| obey the law of conservation of mass |
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| extra substances produced in industry during chemical and physical changes are called |
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| the ablity of two substances to react and form a new substance such as carbon dioxide is a |
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| substance composed of a single kind of atom |
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| substance made of atoms of two or more different elements joined by chemical bonds |
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