Math TAKS Obj 7 Vocab. Net A two dimentsional representation of a three dimensional object.
Taks review obj 4 with answers
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Transcript of Taks review obj 4 with answers
Properties of Matter
Density
FACT: If it floats, it is less dense.
Properties of Matter
Viscosity Buoyancy
density is an intensive property of matter - it does NOT change
when you change the amount or shape of the sample.
density = mass/volume - given on the formula page of the
TAKS. Mass will be given in grams. Volume will be in milliliters
(mL) or liters (L). Check the units in the answers to ensure they
match the mass and volume units given in the question.
4.05 g / 12.0 mL = 3.775 g/mL
Viscosity is resistance to flow. Think of thickness - honey vs. water. Honey is much more viscous than water.
A - refers to density, which is unrelated to viscosity
B - there is no information indicating the block will change the temperature of the solutions.
C - displacement involves density and is unrelated to viscosity
D - the time the block takes to move through the solution under the force of gravity (sinking) is dependent on viscosity,
assuming the metal block is more dense than both solutions.
Buoyancy means floating.
Buoyant force is how much a fluid pushes up
on things floating in the fluid.
Density determines buoyancy, so...
Density goes with buoyancy! If a question asks about buoyancy, think
about density. Think about the density formula.
Periodic Table
# of protons identifies the element. Count them and
find the matching atomic #.
protons
+
neutrons
o
electrons
–
# of protons identifies the element. Count them and
find the atomic #.
Lithium (3 protons)
Columns on the PT are known as groups.
Elements in the same GROUP have similar
physical and chemical properties.
Metals tend to react with non-metals
Tip: When asked about groups and how they react, label each answer choice as
a metal or non-metal. The answer will become obvious.
Number of protons determines the identity
of an element. Number of protons is the
atomic number.
Number of protons determines the
identity of an element. Number of
protons is the atomic number.
Elements with similar properties are in
the same GROUP (column).
Metals react with nonmetals. Label the
element in the prompt as metal or
nonmetal, and then all the answers as
metal or nonmetal.
metals
metals
metals/metalloid
nonmetals
K is a metal (group 1)
·Metals lose / donate / give electrons - group 1 loses electrons most
readily
·Nonmetals gain / accept / take electrons - group 17 gains electrons most
easily
nonmetal - group 17
nonmetal - group 15
metalloid - group 15
metal - group 13
When you see a question referring to the periodic table,
refer to the one in your test! It is there to help you.
·Group 16 are nonmetals.
·Nonmetals gain / accept / take electrons - group 17 gains electrons
most easily
a.k.a. Law of Conservation of Mass
reactants mass must equal products mass
=+ +
reactants products
1) Make a table under each compound.
2) Count number of atoms of each element in each compound.
3) Make the number of atoms of each element equal on each side
of the equation by using whole number coefficients where
needed.
2 PbO2Coefficient
You can change this.Subscript
You CANNOT
change this.
In "3 SO2" there are 3 Sulfur and 6 Oxygen atoms.
Ask yourself, is it still the same thing it was before the change took place? If not, it's
usually a chemical change.
still ice, just broken, physical
still sugar, just dissolved, physical
This milk is not milk anymore. It's gross.
still lead, just in liquid form, physical
acids = chemical changes
acids = chemical changes
"combining...to form hematite" = new substance = chemical
broken shale is still shale.
say this 5 times fast
Water is polar and uses its polarity to dissolve any substance that
is also polar.
think: HEAT CRUSH STIR!
HEAT, not cool
NOOOOOO!
not a factor for solubility of a solid
pH of the mixed solution is more basic
not a factor in pH
not a factor in pH
not a factor in pH
YES
Only changing the concentration of H+ ions and OH- ions can change the pH of a
solution.