Transcript Because the iron sheet is denser than the iron powder. Because

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When Henry walked into school in the morning, the sky
was dark and cloudy. Henry states that "it will rain
soon." Henry has made a(an)
hypothesis.
theory.
inference.
prediction.
prediction.
Not close!
Which of the following supports the conclusion that a
chemical reaction has occurred?
Adding salt to a salt water solution results in salt
settling to the bottom of beaker
Heating a salt solution on a hot plate raises its
temperature.
Shining a flashlight through a beaker salt solution
causes refraction of the liquid.
Adding an acid to a salt solution raises temperature.
Adding an acid to a salt
solution raises temperature.
If you thought that
you were wrong,
you are right!
Pete, Karen and Marcus each race a remote control
soapbox car on a straight, 2-meter course. Pete's car
completes the race in 13 seconds. Karen's car completes
the race in 13 seconds. Marcus' car completes the race
in 8 seconds. Which of the following is the correct value
of the average velocity of the fastest car?
20 m/s
26 m/s
16 m/s
0.25 m/s
0.25 m/s
STOP!
There are three unplugged lamps in Rudy's living room.
Rudy uses an ohmmeter to determine that the overall
resistance of the circuit decreases as he plugs the lamps
in. What kind of wiring is the circuitry in Rudy's
house?
series
parallel
mixed
direct
parallel
A beach ball rests on the sand. When the wind blows, the
ball rolls away. Which statement correctly assesses the
reason for this change in motion?
The ball moved because an unbalanced force acted upon
it.
The ball moved because a balanced force acted upon it.
The ball moved because the force of gravity was overcome.
The ball moved because there was no friction to overcome.
The ball moved because an
unbalanced force acted upon it.
Which of the following scientist's work most clearly
illustrated that atoms had a nucleus, which contained the
great majority of the mass of the atom?
Niels Bohr
JJ Thomson
Albert Einstein
Ernest Rutherford
Ernest Rutherford
The speed of an object increases 6 m/s over 3 seconds.
What is its acceleration?
2 m/s2
3 m/s2
18 m/s2
0.5 m/s2
2
2
m/s
When white light is refracted in a prism, which
wavelengths are bent the most?
the shortest ones, violet
the shortest ones, red
the longest ones, violet
the longest ones, red
the shortest ones, violet
In lab, Paul added a small amount of a solid cobalt salt to
his reaction vessel. The cobalt salt was added to catalyze the
chemical reaction. While he was pouring the salt into the
test tube, he spilled a small amount onto the countertop.
Which of the following factors is least likely to be affected
by the spillage of salt?
Paul's ability to replicate his results.
Paul's ability to interpret his data.
The equipment needed for the experiment.
The accuracy of Paul's data
The equipment needed for
the experiment.
In lab, Paul added a small amount of a solid cobalt salt to his
reaction vessel. The cobalt salt was added to catalyze the
chemical reaction. While he was pouring the salt into the test
tube, he spilled a small amount onto the countertop. Which
of the following describes the impact of the spill on the
experiment?
unpredictable impact
predictable impact
correctable impact
little or no impact
unpredictable impact
Which of the following is the purpose of an
experimental group?
to test the hypothesis by changing one variable
to indicate error in the experiment
determine the method of an experiment
to generate ideas for the future experiments
to test the hypothesis by
changing one variable
Too bad!
Identify the force needed to accelerate a car from 0m/s to
30m/s in 10s if the mass of the car is 2000kg.
**a = Vf – Vi ; f = ma
t
find “a” and then use in f = ma.
6.7N
667N
6,000N
600,000N
6,000N
Ross was riding his bike down a hill, and he ran straight
into a mailbox. Identify the statement that most closely
describes Ross' motion immediately following his collision
with the mailbox.
He is thrown forward over the handlebars.
He is thrown backwards off the bike.
He is thrown sideways off the bike.
He is thrown upward into the air.
He is thrown forward over
the handlebars.
Gravity is the force of attraction between any two objects
that have mass. The gravitational force that a body exerts
depends, in part, on its mass. Which of the following
factors also affects the amount of gravitational
force experienced between two bodies?
the distance between the bodies
the relative speed of the bodies
the altitude of the bodies
the angle of the bodies
the distance between
the bodies
Kinetic and Potential are terms that describe
the energy of an object. Which of the following
statements is true?
All potential energy becomes kinetic energy.
Potential energy is expressed as motion.
All kinetic energy becomes potential energy.
Potential energy is stored.
Potential energy is stored.
The nucleus of a tritium atom contains two
neutrons and one proton. What is tritium?
an isotope of hydrogen
an isotope of helium
an isotope of lithium
an ion of helium
an isotope of hydrogen
All of the elements in the halogen
family
need to give up one electron to become stable
need to gain one electron to become stable
do not react at all with other elements
do not need to gain one electron to become
stable
need to gain one electron to
become stable
Examine the Periodic Table of the Elements.
Which of the following elements
has the lowest ionization energy
(That is, would be easiest to ionize)?
nitrogen
helium
carbon
lithium
lithium
By mass, about 80% of the human body is water,
and water's ability to surround ions is
essential to the proper functioning of many
biological processes. Identify the property of water
that allows it to surround ions.
density
volatility
buoyancy
polarity
polarity
The following reaction is propane burning in oxygen to
produce carbon dioxide and steam.
____C3H8+_______O2 -> ____CO2+____H2O
Which of the following sets of numbers
will balance this equation?
1, 5, 3, 4
1, 3, 4, 5
5, 4, 3, 1
4, 5, 1, 3
1, 5, 3, 4
Rust forms by the reaction of iron with oxygen to produce
iron oxide. An 88g iron
nail rusted. The rusted nail (iron oxide)
had a mass of 102 g. Identify the mass of
oxygen that reacted in the rusting of the nail.
14 g
88 g
102 g
200 g
14 g
NOT CLOSE!
At standard temperature and pressure, a 5 gram sample of
powdered iron will react more quickly with
dilute hydrochloric acid than a 5 gram sheet of hammered
iron. Why is this?
Because the iron sheet is denser than the iron powder.
Because the iron powder has more surface area
exposed to the acid than the iron sheet.
Because the iron sheet has more surface area exposed
to the acid than the iron powder.
Because the iron sheet is less dense than the iron powder.
Because the iron powder has
more surface area
exposed to the acid than the iron
sheet.
You drop an object with a mass of 7.6 g and a volume of
7.0 cm3 in a container of gasoline.
Gasoline has a density of 0.7 g/m3.
Which of the following statements describes
what will happen to the object?
The object will float because it is less dense than the gasoline.
The object will float because it is more dense than the gasoline.
The object will sink because it is less dense than the gasoline.
The object will sink because it is more dense than the gasoline.
The object will sink because it is more
dense than the gasoline.
The International System of Units (SI) standardizes
measurement units,
enabling scientists from all over the world
to communicate their results in
common metric units. Which of the following
correctly identifies the base metric units for length,
mass, time and temperature?
meter, kilogram, second, Kelvin
kilometer, kilogram, second, Kelvin
meter, kilogram, second, Celsius
meter, gram, second, Kelvin
meter, gram, second, Kelvin
Which pair of elements is most likely to form
an ionic bond?
K and H
N and C
K and Cl
C and H
K and Cl
Make your wager
What process does the following description refer to
"a block of dry ice sitting on a laboratory
bench top has a cloud of gas around it?“
Melting
sublimation
evaporation
fumigation
sublimation