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Identify the letter of each sentence that is true about the parts of an atom.
a. Protons are much lighter than electrons.
b. The number of neutrons always equals the number of protons in a nucleus.
c. In an atom, the number of protons equals the num |
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| Where does most of an atoms mass come from? |
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| The space in which the electrons move is huge compared to the space occupied by the? |
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| What are the electrons farthest away from the nucleus called? |
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Identify the letter of each sentance that is true about valence electrons.
a. The number of valance elctrons in an atom determines many properties of tha atom.
b. The valence electrons are the only electrons in the electron cloud.
c. The atom's valenc |
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| A way to show the number of valence electrons an atom has , using dots around the symbol of the element is an? |
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| According the to dot diagram in Fig 3 how manyu valence electrons does Argon have? |
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| A chemical bond forms between two atoms when ______________ move between them. |
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| What are two ways in which valence electrons move between atoms? |
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a. transfer one to another
b. Shared between atoms. |
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| The number of protons in the nucleus of an atom is called the |
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| How are the elements arranged in the periodic table ? |
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| left to right, top to bottom. |
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Same colum up and down
same vertical column
row across the table. |
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| in figure 6 from a row across the periodic tableor a colum down the perodic table |
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| how many valence electrons dose nitrogen atom have |
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| why dose fluorine react with other atoms so easy |
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| because its not balenced and it need one more to be stable |
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| why are elements in the halgon family very reactive |
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| it has seven valence electrons |
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| What property makes the alkali metals very reactive? |
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| They lose an electron which makes them more stable. |
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Is the following true or false?
Hydrogen is extremly reactive. |
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| a group of atoms electricly charged is... |
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| what happens to a at when it loses an electron |
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| when an atom gains an electron |
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| an attraction between to oppistly charged ions |
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| why dose a sodium atom become more stable when it loses an valnce electron |
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| it has only one so when it loses one it becomes stable |
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| What kind of ions do a sodium atom and a chlorine atome become when a valence electron is transferred from one to the other? |
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sodium is positive
chlorine is negative |
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| name there charge sodium, magnesium, chloride, and sulfate, |
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| how many chloride atoms dose it take to cancel each other out |
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| ions that are made of one or more atoms are called |
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| how many atoms makeup co3-2 and whats its charge |
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| its made of one carbon and 3 oxygen with negtive to charge |
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in an ionic compound the name of the negtive ion comes first
this is true or false |
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| when dose the name of a negtive ion become ide |
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| What are three characteristic properties of ionic compounds? |
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| Crystal, high melting point, and electric conductivity. |
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| An orderly three dimensional arrangement formed by ions is called a |
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| In an ionic compound, every ion is attracted to what other ions? |
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| That is near it and has an opposite charge. |
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| At room temperature, ionic bonds are strong enough to cause all ionic compounds to be? |
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| When do ionic compounds conduct electricity well? |
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| When it disolves in water. |
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| Chemical bonds that share an electron. |
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Identify the letter of the sentances that are true about covalent bond in a molecule of florine?
a. Only the right atom attracts the two electrons in the middle.
b. Both atoms lose electrons
c. Both atoms attract the two shared electrons at the same |
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| In the dot diagram of an oxygen molecule, how many covalent bonds are in the molecule? |
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| A chemical bond formed when atoms share two pairs of electrons is called a ? |
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| What do molecular compounds consist of? |
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| Molecules having covalanty bonded. |
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Identify the letter of each sentance that is true about molecular compounds.
a. More heat is needed to separate their molecules than is needed to seperate ions.
b. They melt at much lower temperatures than do ionic compounds.
c. They boil at much lo |
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| How do molecular compounds come to have a slight electrical charge? |
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| Some atoms pull more strongly on shared electrons then other atoms do. |
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| In a polar covalent bond, electrons are shared? |
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| How are electons shared in a nonpolar covalent bond? |
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| The valence electrons are shared equally. |
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| How can a molecule be nonpolar even when is has polar bonds? |
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| Polar bonds cacel each other out. |
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Is the following true or false?
Water molecules are polar? |
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| Why do polar and non polar molecules have different proporties? |
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| Differeces in attraction. |
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| Why don't water and vegtable oil mix? |
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Water = polar
Oil = Nonpolar |
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| When you do laundry, what causes the nonpolar dirt to mix with the polar water? |
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| The dirt has to mix with soap |
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| A naturally occuring solid that has a crystal structure and a definite chemical composition is called a? |
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| What properties do mineralogists use to identify minerals? |
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| Shape, hardness, color and shinyness. |
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| What do all the properties of a mineral depend on? |
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| Shape, hardness and others. |
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| true or false all minral crystals are made of ions |
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| what determines a minrals phsical properties |
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| the arrangement of particles in a minral & that kind of bond holding them together |
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| true false the stronger bonz of quarts makes it harder than halite |
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