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What holds ions together in an ionic bond?
ionic compounds and the attraction between postive and negative ions
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how do you know from a formula if a substance is an inorganic acid? Give an example of an inorganic acid.
an acid base neutralization reaction produces water and salt molocules.
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Which family is unreactive?
The noble gases
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Which family of non-metals is most reactive?
the halogen
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What is the formula used to calculating density? be able to use this formula. ex: calculate the density of a 100 gram sample with a volume of 25 ml.
- Density= Mass/Volume
- Density= 100/25 25 is the density
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how do you identify an element on the periodic table?
by the atomic symbol
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what is the maxinum number of valence electrons an element can have?
eight
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if magnesium loses 2 electrons how many valence? total? and how is it charged?
- 1) 8 valence
- 2) 10 total
- 3) positive
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name 2 methods used in class to identify bases and acids.
cabbage juice and litmus paper
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how many bonds can each carbon atom form in a hydrocarbon?
can form 4 bonds
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name 2 types of large biological molocules that are polymers:
silk and cotton are polymers along with polyester and nylon
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name and describe the process by which stars produce and release large amounts of energy
nuclear fusion
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name a concern of prolong exposure to radiation
illness, disease, or death
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how many valence electrons do atoms of the following elements have? sodium, boron, clorine, and neon?
- sodium-1
- boron-3
- chlorine-7
- neon-8
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why is it useful to know the half-life of radioactive isotopes?
to know how long has passed since the item had died
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describe the states of matter, including arrangment and motion of particles in each state
- solid- slow motion and close
- liquid- medium motion and average
- gas- fast motion and far apart
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what happens when chemical bonds break and new ones form?
chemical change
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if nitrogen gains 3 electrons, how mabt valence electrons, total and how will it be charged?
- 1) 8 valence electrons
- 2) 10 total electrons
- 3) negative charge
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how do u know from a formula if a substance is a base? give and example of a base.
if it produces hydroxide ions in water.
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what elements bond together to form a hydrocarbon? which kinds of bonds are formed between these elements.
hydrogen and carbon also double and triple bonds
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