PRAXIS SCIENCE 5905 EXAM LATEST EXAM |
ALL QUESTIONS AND CORRECT ANSWERS |
ALREADY GRADED A+ | VERIFIED ANSWERS |
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Your class observes a penny underwater and notices that an object
underwater appears to be closer to the water's surface than it really is. How
do you explain this to the class? ---------CORRECT ANSWER-----------------
Light bends as it travels from one substance to another (water to air). This
change in the path of the light wave makes the penny appear closer to the
surface than it really is.
To demonstrate the Doppler effect, you ask a student to stand still. You tell
the student that you will play music from your phone walking toward him
first and then you will hold the phone out as you walk in a circle around
him. Will the sound increase coming toward him or in a circle? ---------
CORRECT ANSWER-----------------The student will perceive an increase in
the sound's pitch if the teacher walks toward the student
As the source of the sound moves toward the student, each step closer
(successive sound wave) will start at a point closer to the student resulting
in the sound waves reaching the student with increasing frequency.
Because the frequency of the sound waves increase, the student perceives
an increase in the sound's pitch.
Individual molecules in liquid water are different than molecules in water
vapor because... ---------CORRECT ANSWER-----------------They are further
apart
You instruct students to fill two of the exact same containers with the same
amount of freshwater and saltwater. You then ask them to place different
,items into the same containers and write in their notebooks about which
items sank and which items floated. What OBSERVATION should students
make if an object sank in freshwater but floated in salt water? ---------
CORRECT ANSWER-----------------The salt water was DENSER than the
freshwater.
An object will sink in a liquid if its DENSITY is greater. An object will float if
its DENSITY is less than OR equal to that of the liquid. The student should
CONCLUDE that the salt water is DENSER than BOTH the object AND the
freshwater.
You instruct students to:
1. soak steel wool in vinegar for 1 minute
2. remove the steel wool from the vinegar
3. squeeze the steel wool and blot it with a paper towel
4. wrap the steel wool around the bulb of a thermometer
5. place the steel wool and thermometer together in a covered beaker to
allow the rusting process to happen
6. observe the temperature reading of the thermometer increase slowly
What would be an example of a students' OBSERVATION? A reaction
occurred in which:
A. Energy was created
B. Energy was destroyed
C. Energy was evaporated
D. Energy was released ---------CORRECT ANSWER-----------------D. A
reaction occurred in which energy was released.
A temperature increase shows that energy was released into the
surroundings. Soaking steel wool in vinegar removes a protective coating
on steel wool. This exposes the iron in the wool to oxygen in the air. Iron
and oxygen in the presence of water produces rust, which releases heat
energy.
Look here! You tell students as you rub an inflated balloon with a wool cloth
and hold the balloon over torn up pieces of paper on a table. Students
,watch as the bits of paper rise up toward the balloon. What HYPOTHESIS
is supported by the students' observation of the balloon and paper? ---------
CORRECT ANSWER-----------------The balloon has an electrostatic charge.
Forms when electrons are shared between atoms ---------CORRECT
ANSWER-----------------Covalent bond
What do lithium, sodium, and potassium have in common? ---------
CORRECT ANSWER-----------------They have one valence electron and are
grouped together in the first column on the periodic table. They also ave
similar chemical properties.
What do lithium, sodium, and potassium NOT have in common? ---------
CORRECT ANSWER-----------------They have different atomic numbers,
different atomic masses, and different melting points.
Changes an atom from one that has higher energy inside its nucleus into
one with lower energy ---------CORRECT ANSWER-----------------Nuclear
decay
Evaporation of water from the leaves of a plant ---------CORRECT
ANSWER-----------------Transpiration
Transfer of heat by the movement of liquid or gas ---------CORRECT
ANSWER-----------------Convection
The mineral's ability to resist separation or breaking when subjected to
stress ---------CORRECT ANSWER-----------------Tenacity
The process of determining the age of a sample of organic matter based on
the amount of carbon-14 it contains ---------CORRECT ANSWER--------------
---carbon dating
Large, gently-sloped volcano formed from basaltic lava flows, present at
divergent plate boundaries and above hot spots
An accumulation of one or more minerals ---------CORRECT ANSWER------
-----------rock
The response of a mineral when exposed to magnetic materials; physical
property ---------CORRECT ANSWER-----------------Magnetism
The wave pattern of movement of the earth produced by an earthquake ----
-----CORRECT ANSWER-----------------seismic waves
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