nature of science
Name the scientific method in order
problem, research, hypo, experiment, data, conclusion
Give an 3 examples of a heterogeneous mixture
chex mix, salsa, sand
How do we determine the mass number?
protons + neutrons
Why do atoms bond with each other?
They are all looking for 8 valence electrons.
What are 2 ways we can speed up a chemical reaction?
concentration
surface area
temperature
catalyst
What is the difference between an IV and a DV?
IV=you control
DV= you measure
Give two ways to change a piece of paper physically and one way to change it chemically.
ripping, cutting
burning
Who developed the periodic table?
Mendeleev
Draw the dot diagram for silicon.
4 dots
what is the difference between a decomposition reaction and a synthesis reaction.
decomp= break down
synthesis= put together
What is the goal of science?
To use inferences and observations to understand the world around us.
When a solid goes to a liquid what is that called?
melting
What does it mean to be an isotope?
an atom with different number of neutrons
What do we call it when an atom gains or loses and electron?
ionic bond
What are the starting materials for a reaction called?
reactants
What are the three different branches of science and what problems do they solve?
Life-living things
earth-earth (duh)
physical- matter and energy
name the 3 states of matter and tell me their relative energy.
solid= least energy
liquid= medium
gas= high
what family would you find gold, silver, and osmium?
transition metals
How do we know that a formula is ionic?
It has a metal and a nonmetal.
Name three out of the four hints that a chemical reaction has taken place.
gas formed
precipitate
energy change
color change
What is the difference between qualitative and quantitative data?
Qualitative= descriptions
Quantitative= numbers
If a block of wood has a mass of 23g and a volume of 2.3 cm^3 what is its density?
10
Give the charge and location for each subatomic particle: electron, neutron, and proton
electron= - charge and orbitals
proton= + charge and nucleus
neutron= 0 charge and nucleus
magnesium + fluorine
Give me the correct formula
MgF2
What type of reaction releases heat to the atomosphere? Feels hot.
exothermic