Science Study Guide
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What holds ions together in an ionic bond?
ionic compounds and the attraction between postive and negative ions
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.
Which family is unreactive?
The noble gases
Which family of non-metals is most reactive?
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
how do you identify an element on the periodic table?
by the atomic symbol
what is the maxinum number of valence electrons an element can have?
if magnesium loses 2 electrons how many valence? total? and how is it charged?
- 1) 8 valence
- 2) 10 total
- 3) positive
name 2 methods used in class to identify bases and acids.
cabbage juice and litmus paper
how many bonds can each carbon atom form in a hydrocarbon?
can form 4 bonds
name 2 types of large biological molocules that are polymers:
silk and cotton are polymers along with polyester and nylon
name and describe the process by which stars produce and release large amounts of energy
name a concern of prolong exposure to radiation
illness, disease, or death
how many valence electrons do atoms of the following elements have? sodium, boron, clorine, and neon?
why is it useful to know the half-life of radioactive isotopes?
to know how long has passed since the item had died
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
what happens when chemical bonds break and new ones form?
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
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.
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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