Transcript May 8 Matter & Chemistry

May 5, Motion
Correct answer: B. Remember average
Speed is = total distance
total time
Therefore
50 meters
= 2 meters
25 minutes
minute
May 5, Motion
Correct answer: C
Remember, the steeper the
slope on a motion graph, the
greater the speed.
May 5, Motion
Correct answer: C. Remember, the key to this question is what they are asking. In
this case “How far” or distance. Distance = speed x time. The time is 30 minutes
Which must be converted into hours. 60 minutes = 1 hour, so 30 minutes = .5 hours.
9 kilometers x .5 hours = 4.5 kilometers.
May 5, Motion
Correct answer: B. Remember, they are asking for time.
Time = distance
speed
100 meter = 50 sec.
2 m/sec
May 5, Motion
8.
Which of the following represents the velocity of a moving
object?
A
40
B
40 m north
C
40 m/s
D
40 m/s north
Correct answer = D. Remember, velocity is distance + direction.
May 5, Motion
Correct answer: B. Velocity is speed + direction. The object is not accelerating
so “B” is correct.
May 5, Motion
Correct answer: B Remember, speed = distance divided by time. The object traveled from
0 to 18 meters in 6 seconds (4 sec -10 sec) Therefore 18 m/6sec = 3 m
s
May 5, Motion
Correct answer: D. Remember, distance is
= to speed x time. So 10 m/s x 2 sec = 20m.
May 6, Forces
Correct answer: C
If 1.0 cm = 4 N of force, then 3.5 x 4 N
would = 14 N.
May 6, Forces
Correct answer: B. The forces
all have the same magnitude
of 3 Newtons.
May 6, Forces
Correct answer: B Remember, when an object reaches terminal velocity in does
not stop falling, it stops accelerating and reaches a constant speed.
May 6, Forces
Correct answer: A
The net force is the combined
opposing forces. Therefore
200N – 150 N = 50 N net
May 6, Forces
Correct answer: A
Remember, the net force can only be
added if the vectors (direction) are opposed
from each other. So the net force is shown
below.
F net
May 6, Forces
Correct answer: B Remember, Force= mass x acceleration The greater the mass the more
Force necessary to accelerate that mass.
May 7, Density
Correct answer: C Since Lump “Y” had the least
combined mass and volume, it therefore has the
lowest density between the two (y & z)
May 7, Density
Correct answer: A The density formula of D=m/v can also be used to calculate mass.
Mass = Density
Volume
May 7, Density
Correct answer: C Remember, D = M/V 64g/8mL = 8 g/mL
May 7, Density/Buoyancy
Correct answer: C Remember, Archimedes principle, the buoyant force is
is equal to the weight of the fluid that is displaced.
May 7, Density
Correct answer: C
If you divided each mass into each
volume, the only density
Measurement that is less than
1.0 g/mL is sample 3.
24g
= .24 g/mL
100 mL
May 7, Density
Correct answer: D
Remember, an object will sink if
that object is more dense than the
fluid it is placed in.
1.14 g/cm3
1.23 g/cm3
May 8, , Matter & Chemistry
Correct answer: B
May 8, Matter & Chemistry
Correct answer: C
May 8, Matter & Chemistry
Correct answer: D
May 8, Matter & Chemistry
Correct answer: C Remember, molecule movement increases as we go from a solid, to
a liquid to a gas.
May 8, Matter & Chemistry
Correct answer: C Remember, Ice is a solid crystal, so the molecules of water
arrange themselves in rows called a “Lattice”
May 8, Matter & Chemistry
Correct answer: B All are located to the right of the staircase on the periodic table.
(non-metals)
May 8, Matter & Chemistry
Correct answer: C Remember, when elements are combined they form compounds
which have different properties.
May 8, Matter & Chemistry
May 8, Matter & Chemistry
Correct answer: C Remember all
non-metals are located to the right
of the staircase.
May 8, Matter & Chemistry
Correct answer: D
Remember, Isotopes are atoms
of the same type with
different numbers of neutrons.
May 8th, Matter & Chemistry
Correct answer: A Remember, when two elements form a compound, that new
substance has different properties.
March 8th, Matter & Chemistry
May 8
Matter & Chemistry
Correct answer: C
There are the same number
of atoms on both sides of
the reaction.
1Mg, 2Cl
1Mg, 2 Cl
May 8th, Matter & Chemistry
Correct answer: D Remember, reactions are either endothermic or exothermic.
Heat is being released or absorbed.
May 8, Matter & Chemistry
May 8, Astronomy
Correct answer: A remember, stars are the only object that produce their own
light.
May 8, Organic Chemistry
M
Correct answer: A
Remember, on the pH
the lower the pH, the
stronger the acid.
May 8, Organic Chemistry
Correct answer: D Remember carbon has 4 valence electrons and can form bonds with
itself and a variety of other elements.
May 8, Organic Chemistry
Correct answer: C Remember, because of Carbon’s valence structure it can
bond with itself and many other elements.
May 8, Organic Chemistry
Correct answer: A Remember, carbon is part of all organic (living) compounds. Sugar
is an organic compound. C6H12O6
May 8, Astronomy
34.
A galaxy is best described as a cluster of
A
hundreds of stars
B
Thousands of stars
C
Millions of stars
D
Billions of stars
Answer is D, billions of stars
May 8, Astronomy
35.
To express the distance between the Milky Way
Galaxy and others galaxies, the most appropriate
unit of measurement is the
A
meter
B
kilometer
C
light-year
D
astronomical unit
Answer is C, light-year
May 8, Astronomy
37.
.
37.
An object composed mainly of ice is orbiting the
Sun in an elliptical path. This object is most likely
A
a planet
B
an asteroid
C
a meteor
D
a comet
Answer is D, comet
CST Prep May9
1. Casey does an experiment using a ramp and a
trolley with different weights in it. The results from
the experiment are shown in the graph.
What is the variable in this experiment?
*ask yourself this question-what did he change
during the experiment that would effect the
outcome or results?
C changing the mass, (increasing it) made the
trolley gain speed.
CST prep May 9th
2. The graph shows the temperature of a gas as it
is cooled from 95 to 68 degrees over time.
You cannot assume this is water and if the there is
no change in temp, the gas molecules are slowly
losing energy and turning into a liquid. So the
correct answer is B.
CST Prep May 9th
3. The weight in water of any object will be less due
to the opposing buoyant force.
Although the force of gravity is greater, the buoyant
force pushes upward and cancels a small amount of
the gravitational force. Therefore the answer is D.
CST prep May 9th
4. Volume =Length x Width x Height
What measurement of the sugar cube is missing?
A. Width
CST prep May 9th
5. Correct answer is A.
Density = Mass/Volume.
Mass = 38 g Density = .95 g/cm3
Volume = 40 mL
CST Prep May 9th
6. Correct answer is B
Mass = 45 g
Volume = 15 cm3
Density = 3 g/cm3