Term
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Definition
| anything that has mass and takes up space |
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Term
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Definition
| light and heat do not take up space and they have no mass |
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Term
| Who was a Greek philosopher who thought the universe was made of empty space and tiny bits of stuff? |
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Definition
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Term
| Democritus believed that the bits of stuff were so small they could no longer do what? |
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Definition
| be divided into small pieces |
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Term
| What are tiny pieces of matter called? |
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Definition
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Term
| Who was the French Chemist that came up with the Law of Conservation of Matter? |
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Definition
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Term
| What does the Law of conservation of Matter? |
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Definition
| states that matter is not created or destroyed- it only changes form. |
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Term
| Who believed that matter was made of atoms that were too small to be seen by the human eye? |
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Definition
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Term
| Dalton studied the experiments of wLavoisier and others and developed what? |
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Definition
| a model to help explain their work |
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Term
| What did Dalton's model become known as? |
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Definition
| the Atomic Theory of Matter |
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Term
| What are invisible, negatively charged particles? |
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Definition
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Term
| Who conducted experiments using a cathode ray tube, which is a glass tube sealed at both ends out of which most of the air has been pumped? |
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Definition
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Term
| What is matter that has an equal amount of positive and negative charge? |
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Definition
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Term
| How did Tomson picture the atom? |
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Definition
| as a ball of positive charge with electrons embedded in it |
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Term
| What did Rutherford call the positively charged, central part of the atom? |
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Definition
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Term
| What did Rugherford name the positively charged particles in the nucleus? |
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Definition
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Term
| Who said that particles from the nucleus had no change? |
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Definition
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Term
| What did Chadwick call unchanged particles? |
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Definition
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Term
| Who found evidence that electrons in atoms are arranged according to energy levels? |
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Definition
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Term
| The lowest energy level is located where in relationship to the nucleus? |
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Definition
| closest and can hold only 2 electrons |
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Term
| What is a special cloud of varying density surrounding the nucleus? |
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Definition
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Term
| What is matter made of only one kind of atom? |
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Definition
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Term
| How many elements are known and how many of them occur naturally? |
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Definition
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Term
| Chemist have created a chart of the elements to help them organize and display the elements which is called what? |
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Definition
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Term
| How are the elements organized on the peridic table? |
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Definition
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Term
| What are the rows in the table called? |
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Definition
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Term
| What are the columns in the periodic table called? |
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Definition
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Term
| Althought the number of protons changes from element to element, every atom of the same element has what? |
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Definition
| the same number of protons |
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Term
| What can vary even for one element? |
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Definition
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Term
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Definition
| atoms of the same element that have different numbers of neutrons |
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Term
| What is an atom's mass number? |
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Definition
| the number of protons plus the number neutrons it contains |
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Term
| What is the weighted average mass of the isotopes of the isotopes of an element and the number found below the element symbol? |
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Definition
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Term
| What is the unit that scientists use for atomic mass? |
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Definition
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Term
| What are the three general categories of elements? |
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Definition
| metals, metalloids, and nonmetals |
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Term
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Definition
| generallly have a shiny or metallic luster and are good conductors of heat and electricity |
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Term
| All metals are malleable. What does malleable mean? |
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Definition
| they can be bent and pounded into various shapes |
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Term
| Metals are also ductile. What does ductile mean? |
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Definition
| they can be bent and pounded into various shapes |
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Term
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Definition
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Term
| What normally looks dull? |
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Definition
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Term
| What are poor conductors of heat and energy? |
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Definition
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Term
| What is solid at room temperature? |
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Definition
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Term
| What is matter that has the same composition and properties throughout is called what? |
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Definition
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Term
| Elements, such as a bar of gold or a sheet of aluminum, are what? |
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Definition
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Term
| What is a substance whose smallest unit is made up of atoms of more than one element bonded together? |
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Definition
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Term
| H2O is the chemical formula for what? |
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Definition
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Term
| What is the formula for hydrogen peroxide? |
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Definition
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Term
| What is the formula for carbon dioxide? |
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Definition
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Term
| No matter what quantity of the compound you have, what always remains the same? |
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Definition
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Term
| What happens when two or more substances come together but don't combine? |
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Definition
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Term
| How can you sometimes separate a mixture of solids? |
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Definition
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Term
| What does homegeneous mean? |
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Definition
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Term
| What has larger parts that are different from eachother? |
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Definition
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