WorksheetsChem and Motion Pretest
Total questions: 26
Worksheet time: 2hrs 10mins
A scientist's paper is rejected by a journal because the paper did not reveal key details about the experiment she performed to get her results. What argument could the editor give for this rejection?
Sample collection had been done by a graduate student.
The scientist's findings were similar to results reported for other species.
The scientist had repeated her experiment several times with identical results.
Other scientists would not be able to verify her findings without more information.
I don't know the answer at this time.
Which is TRUE?
A is slower than C
B is the fastest
C is slowing down
all are going forward
I don't know the answer at this time.
A driver is headed north at 50 km/hr. A box is sitting on the seat next to him.
Which action by the driver would most likely cause him to observe the box appear to slide to the west?
Applying the brakes
Speeding up to 60 km/hr
Making a turn to the west
Making a turn to the east
I don't know the answer at this time.
When dropped from the same height, why does a flat sheet of paper fall more slowly than the same sheet when it's tightly crumpled into a ball?
The sheet of paper has less mass when it's flat than it does when it's crumpled
The sheet of paper weighs less when it's flat than it does when it's crumpled
The force of gravity has a greater effect on the crumpled paper than it does on the flat paper.
The flat piece of paper has a greater surface area and encounters more air resistance than when it is crumpled.
I don't know the answer at this time.
A teacher dropped one light ball and one heavy ball from the roof of a school building at the same time. Both balls hit the ground at the same time. The students correctly concluded from this experiment that falling objects:
lose mass as they fall
are influenced by the height of the building
do not accelerate under the influence of gravitational force
accelerate at the same rate, regardless of mass, due to the force of gravity
I don't know the answer at this time.
When you are driving a car, why is braking less effective on a wet road than on a dry road?
The water reduces friction.
Kinetic energy is increased by water.
Friction increases when the brakes are wet.
Reaction time is reduced during a rainstorm.
I don't know the answer at this time.
How could you increase the gravitational potential energy of an object without changing its mass and gravity?
Make the object larger
Lower the object towards the ground
Raise the object farther off the ground
Allow the object to roll on the ground
Which energy transformation below describes the conversion involved when the carbon compounds in wood are burned?
Chemical energy is converted to thermal energy.
Thermal energy is converted into chemical energy.
Potential energy is converted into chemical energy.
Chemical energy is converted into potential energy.
I don't know the answer at this time.
Which wave in the diagram has the greatest wavelength?
1
2
3
4
I don't know the answer at this time.
A noise will travel faster through a solid because
the particles are further apart
the particles are very close together
you can´t hear noise through gas
solid particles move faster through the air
I don't know the answer at this time.
Light travels in air at approximately 3.0 x 108 m/s. When it enters a glass window, this speed is reduced to about 2.0 x 108 m/s. When the light re-enters the air, what will the speed of light be?
2.0 x 108 m/s
2.5 x 108 m/s
3.0 x 108 m/s
5.0 x 108 m/s
I don't know the answer at this time.
The atomic number of carbon is 6, which means that carbon atoms will always have 6
ions
protons
neutrons
valence electrons
I don't know the answer at this time.
What is the symbol for an ion which has 8 protons and 10 electrons?
N³⁻
O²⁻
F⁻
O³⁻
I don't know the answer at this time.
The noble gas neon is used for filling neon signs. Like other noble elements, it has a full octet (complete outer energy level) of electrons, which makes the gas
freeze at room temperature
react with other gases in the air
unlikely to combine with other elements
solidify at standard pressure and temperature
I don't know the answer at this time.
A neutral atom of silicon has..
28 electrons
14 electrons
42 electrons
14.0855 electrons
I don't know the answer at this time.
Based on this Lewis dot structure, what group is nitrogen in?
5
15
N
1
I don't know the answer at this time.
When methane (CH4) is burned in the presence of oxygen (O2), the two chemicals react together in a process called combustion. Which of these compounds could be a possible product of this combustion reaction?
NH3
SO2
H2O
CS2
I don't know the answer at this time.
W reacts with X in the following equation:
W + X --> Y + Z
According to the law of conservation of mass, how many grams of W must react completely with 225 grams of X to result in 375 grams of product?
150 grams
225 grams
375 grams
600 grams
I don't know the answer at this time.
Which of these elements would most likely be a shiny, gray-colored solid at room temperature, conduct electricity, and dent when hit with a hammer?
aluminum
argon
chlorine
sulfur
I don't know the answer at this time.
Solid copper wire is a good conductor because
copper contains no protons
electrons move easily within the wire
protons and electrons tend to cluster at opposite sides of it
copper contains the same number of protons and neutrons
I don't know the answer at this time.
Where are neutrons and what is their charge?
inside the nucleus, positive
inside the nucleus, neutral
outside the nucleus, positive
outside the nucleus, neutral
I don't know the answer at this time.
Define a liquid.
Indefinite shape, indefinite volume
Definite shape, definite volume
Found in stars
Definite volume, indefinite shape
I don't know the answer at this time.
Salt (NaCl) is a/an...
Heterogeneous mixture
Homogeneous mixture
Compound
Element
I don't know the answer at this time.
