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61 Cards in this Set

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  • Back
What are the main branches of natural science?
biological, physical, and earth science
How can technology be best defined?
applied science
What usually is the first step in the scientific method?
making an observation
How do scientists test a hypothesis?
doing experiments
What is the scientific notation of 62,000,000?
6.2 (7)
What is the scientific notation of 5,490,000
5.49 (6)
How can matter be defined?
has mass and takes up space
If you put 1 gram of salt into 1 liter of water and stir, what is the resulting liquid an example of?
a homogeneous mixture
What is the science of what matter is made of and how it changes?
chemistry
How can you tell how many atoms are contained in a molecule of: sulfuric acid?
H--2
S--1
0--4

Total of 7 Atoms
Luring Integrated Science mid term
cut apart and study
Which state of matter will hold its shape without a container?
solid
What is the change of a substance from a solid directly to a gas?
sublimation
What does evaporation change a state from?
liquid to a gas
What does the law of conservation of mass state about mass
mass cannot be created or destroyed
What can happen to energy during a chemical or physical change?
converted into another form
What is NOT an example of a physical property?
reactivity
What ARE examples of physical properties?
freezing point
boiling point
density
How do you find the density of a mass of 260g and a volume of 6.5cm3?
Take 260 and divide by 6.5

and you get 40g/cm3
What is an example of a physical change?
dissolving salt in water
What is the charge of an electron?
-1
Why do atoms have no electric charge?
they have an equal number of electrons and protons
According to Bohr's model of the atom, what do atoms behave like?
planets orbiting the sun
According to modern atomic theory, it is nearly impossible to determine an electron's exact what?
position
What is the order of elements in the periodic table based on?
the number of protons in the nucleus
What do atoms of elements that are in the same group have the same number of?
valence electrons
What process does ionization refer to?
losing or gaining electrons
Why is a lithium ion much less reactive than a lithium atom?
it has a full outermost energy level
Oxygen has atomic number 8. What does this mean?
Oxygen has eight protons in its nucleus
What does an atom's mass equal?
the number of protons plus the number of neutrons
Why are alkali metals extremely reactive?
They have one valence electron that is easily removed to form a positive ion
Why are group 18 noble gases are inert?
their outermost energy level is full
A mole is an SI unit that describes what?
amount of a substance
What is the mass in grams of .75 mol o sulfur?
Look on periodic table and find the atomic mass of sulfur (32.066) multiply it times .75

Round to the nearest whole number

Mass= 24g
Why do atoms often join?
so each atom will have an outermost energy level that is full of electrons
What are covalent bonds formed between?
nonmetals atoms
What type of bond do atoms share electrons?
covalent
mononitrogen means
one nitrogen
dioxygen means
two oxygen
trinitrogen
three nitrogen
tetraoxide
four oxygen
pentanitrogen
five nitrogen
hexanitrogen
five nitrogen
heptaoxide
seven oxygen
octanitrogen
eight nitrogen
nonanitrogen
nine nitrogen
decaoxide
10 oxygen
Why can a carbon atom bond to four other atoms?
it has four valence electrons
Alkanes are hydrocarbons that contain what?
single covalent bonds only
Alcohols are organic compounds and contain what?
carbon, oxygen, and hydrogen
Polymers are large organic molecules that are made up of what?
repeating units
What would a change in color such as rusting of metal be a sign of?
a chemical change is taking place
In an exothermic reaction where is energy transferred from?
the reactants to the surroundings
What happens in a synthesis reaction which is a reaction between at least two compounds?
a new, more complex compound is formed.
When balancing a chemical equation, it is balanced by changing or adding what?
coefficients
What is the coeffient in the following?
4
In a balanced chemical reaction, the total mass of the products always equals what?
total mass of the reactants
Which one of these will not spped up a chemical reaction?

presence of a catalyst
higher pressure
smaller surface area
higher temperature
smaller surface area
Why do large, bulky molecules react more slowly than small ones?
They have less opportunity to colide with other molecules.
A special kind of catalyst is an enzyme which works to do what?
speed up a specific biochemical reaction
What do you call the resistance of a fluid to flow?
viscosity