DSST Physical Sciences2

Instructions:

• Answer 50 questions in 15 minutes.
• If you are not ready to take this test, you can study here.
• Match each statement with the correct term.
• Don't refresh. All questions and answers are randomly picked and ordered every time you load a test.

This is a study tool. The 3 wrong answers for each question are randomly chosen from answers to other questions. So, you might find at times the answers obvious, but you will see it re-enforces your understanding as you take the test each time.

1. In Bohr model of atom when is energy emitted?
From peak to peak
How much energy is needed to raise one gram of a substance one degree celcius; it tells that you need more energy to increase temperature
When electron falls from high energy to low energy level
The mass number stays the number but the atomic number decreases by one - usually resulting in another element


2. What do electrolytic techniques involve?
E = (kq)/r^2
Isolating an atom from minerals by decomposing the minerals with an electric current
It decreases; the work done by the gas in expanding decreases its internal energy
It has a positive oxidation potential so it is easily oxidized


3. The probability of an X-ray emission event at a given wavelength is measured by what?
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
Its intensity in the spectrum
Gravity
0 Hz because they are traveling side by side at the same speed


4. Friction is caused by what?
When electron falls from high energy to low energy level
The path is longer on the inclined plane so it will take object longer to reach the bottom
Attractive molecular forces acting between material surfaces in contact
Total internal reflection


5. A nearsighted person has what type of focal length? Thus what do we do to correct this?
6.02 x 10^23 ions/mol
Shorter than it should be so rays from a distant object form in front of retina; use divergent lens
Mass per unit volume compared to water: so if mass is 15 g and displaces 5g of benzene the ratio of object to liquid mass is 15/5 = 3 and then times 3 by the specific gravity of benzene which is 0.7
The regular one


6. What is the relationship between P and n in PV=nRT?
Strong acid and strong base/ weak acid and weak base
Red
They are directly proportional
[S][2S]^2 = 4S^3


7. What is the amt of energy that a frictional force generates?
Energy
Force times the distance over which the force acts
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure
B = pVg; density


8. What are the units of an electric field?
V/m or N/C
Look at the reactants and see which atom is being reduced - since it accepts the electron readily and is reduced we can assume it has the highest electron affinity
Constant to overcome the heat of fusion (solid to liquid state)
It's weight = mg; the work would be the weight times the distance fell


9. If you have a decrease of pressure to which side of the equation is it equilibrium shifted towards? What about if you increase temperature?

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10. If you are given density and volume how do you find mass?
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
(density[p])(volume)
Colligative: it depends on the number of solute molecules in a given volume of water
Ability to locate an event in space


11. When an element decreases its atomic number by one what is emitted?
Positron because this is known as positron decay/electron capture
Zero
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
How strong a base is


12. In order to guarantee a non-zero spin how many electrons are needed?
The path is longer on the inclined plane so it will take object longer to reach the bottom
Voltage
Zero
An odd number


13. The electrical force on a particle depends on what?

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14. What is a metathesis rxn?
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
It is a rxn where you mix aqueous solutions of cations and anions and the ionic cmpds switch the ions with which they were paired
One that has more solute particles per liter of solution


15. If the equation says that the E^o has (-) voltage when being reduced - but it is being oxidized in the problem - what does the voltage then become?
(+)
Accelerated by a higher voltage between the cathode and anode
When all the external forces = zero
The particle's charge and the magnitude of the electric field


16. The temperature of a metal will not increase above its melting point until what?
They must balance
P = F(v) = mg(v -terminal)
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting


17. Always remember that velocity has ____ and ____
F = GMm/r^2
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio
Mag and direction


18. What is the equation for pressure?
Its momentum is zero because velocity is zero; zero because of conservation of momentum
Polar
Density (gravitational constant) height
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect


19. Terminal voltage is provided to what?
The density of the water and volume of the lead object
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting
Cathode; anode
External components of the circuit


20. When does red litmus paper turn blue?
180 degrees; when there is half a wave distance in phase between two waves
In the presence of a base
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
Red


21. If you are told to find the maximum number of NiCo3 that can form how do you do that?

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22. A plane mirror produces an image where?
-l to +l
It can absorb light that lets other electrons fill those orbitals
F = GMm/r^2
At an equal distance behind it as the object is in front of the mirror


23. Why does light travel slower in an optically dense medium than through a vacuum?
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
Strong acid and strong base/ weak acid and weak base
It has a positive oxidation potential so it is easily oxidized
No - it increases the speed at which the rxn reaches that equilibrium


24. Beta decay is the emission of what? How do you know what it is the emission of?
Sp^3
When electron falls from high energy to low energy level
No - it increases the speed at which the rxn reaches that equilibrium
A positron or electron; when atomic number goes up you know an electron has been emitted


25. What is the equation for work done?
1) Young's Modulus 2) Shear Modulus 3) Bulk Modulus
Its intensity in the spectrum
H = negative and S = positive
W = F(displacement)


26. If something is very toxic to a human - what Ksp value should it have for it to be the safest?
The lowest one
Colligative: it depends on the number of solute molecules in a given volume of water
E = (kq)/r^2
Alkali metals = first column


27. How do you find 'g' from Newton's law of gravity?
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c
Polar
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
The lowest whole number ratio of moles of each element in a mole of a cmpd


28. A cmpd with the lowest carbon to oxygen ratio will require how much oxygen for combustion?
It experiences a constant electric force of qE and will thus accelerate towards the positive plate
7 always!!!
The lowest one
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio


29. Can a charged particle be detected by two anodes?

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30. Does the temperature of a water bath or amount of water in a water bath determines if a substance melts?
Look at the reactants and see which atom is being reduced - since it accepts the electron readily and is reduced we can assume it has the highest electron affinity
Density (gravitational constant) height
F = GMm/r^2
Only temperature of the water bath


31. So if you are given an equation and it gives you the E^o for both side equations seen in the big equation - what do you do with them?
A constant force on a mass causes it to have a constant acceleration
You look at what is being oxidized and reduced in the problem
Add them together
Energy


32. The concentration of OH and H30 ions are approximately equal at what pH?
400 to 700 nm
V/m or N/C
7 always!!!
The particle's charge and the magnitude of the electric field


33. What is different between an inclined plane and free fall?
The mass of an acid that yields one mole of H ions or the mass of a base that reacts with one mole of H ions
F =ma and F= qE
The path is longer on the inclined plane so it will take object longer to reach the bottom
Mg


34. How do you find moles of a substance when you are given faradays and electrons?
H = negative and S = positive
When HIn is turned into In- - which is dependent upon the pKa of the indicator
Negative
Faraday/electrons


35. Is the work done by air resistance - positive or negative?
Only temperature of the water bath
The path is longer on the inclined plane so it will take object longer to reach the bottom
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
Negative


36. What is sublimation?
Pascal (N*m^2)
It has a positive oxidation potential so it is easily oxidized
Zero
Going from solid to gas phase


37. Half-sine wave shape is what kind of wavelength with regards to length?
It will take longer to melt if the water bath is only at 90 degrees rather than 100 degrees because at 100 degrees the temperature is hotter and thus it will melt faster than at 90 degrees
Accelerated by a higher voltage between the cathode and anode
The lowest whole number ratio of moles of each element in a mole of a cmpd
L = wavelength/2 so L= (wavelength)(2)


38. What does the empirical formula show?
P = F(v) = mg(v -terminal)
In the presence of a base
The lowest whole number ratio of moles of each element in a mole of a cmpd
The current is the same


39. What is the spin projection quantum number?
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
Colligative; the number of solute particles present
+/- 1/2
Positron emission


40. What kind of geometry is octahedral?
A saturated solution in which the aqueous ions are in equilibrium with the solid
When you have central atom with six ions on it
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous
That it is negative


41. What happens if an atom undergoes positron decay or electron capture?
The mass number stays the number but the atomic number decreases by one - usually resulting in another element
Look at how many times smaller the H concentration becomes with relation to rate law: if rate law says [H] is second order: ((10^-2)^2/(10^-1)^2 = 10^-2 and then times that answer by the original rate
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
7 always!!!


42. The closer the spacing of the anode wire - the better one can specify what?
The part where it's straight almost up before it curves to plateau at new pH; it can tell you what indicator you could use to detect the equivalence point
Where an event took place
When you have central atom with six ions on it
That it is negative


43. What happens to the atomic number and atomic mass of an element that go under Beta decay or positron emission?
It decreases; the work done by the gas in expanding decreases its internal energy
Mass number stays the same but the atomic number increases
Isolating an atom from minerals by decomposing the minerals with an electric current
One that has more solute particles per liter of solution


44. What is conserved in an inellastic collision?
Colligative: it depends on the number of solute molecules in a given volume of water
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
Momentum
It can also equal 'mg'; the compressive strength of a substance


45. How do you balance redox rxns?

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46. In order to increase the kinetic energy of electrons - they must be what?
Accelerated by a higher voltage between the cathode and anode
It decreases; the work done by the gas in expanding decreases its internal energy
F = GMm/r^2
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2


47. In a rxn - how do you figure out which atom has the highest electron affinity?
How much energy is needed to raise one gram of a substance one degree celcius; it tells that you need more energy to increase temperature
It will increase as well because they are directly related - only if pressure is kept constant
Faraday/electrons
Look at the reactants and see which atom is being reduced - since it accepts the electron readily and is reduced we can assume it has the highest electron affinity


48. The Ksp for a substance of AaBb is what?
[A]^a[B]^b
Its momentum is zero because velocity is zero; zero because of conservation of momentum
Sp^3
H has a small atomic radius


49. Why would a solution with unfilled orbitals be responsible for turning a solution a certian color?
It can absorb light that lets other electrons fill those orbitals
Polar
A current; a magnetic field into a curved path; the charge and mass of the incoming particle and can be effectively used to distinguish different species of particles from one another
Yes - if the particle's trail is equidistant between two adjacent anodes


50. Can a catalyst shift equilibrium?
Total internal reflection
No - it increases the speed at which the rxn reaches that equilibrium
The mass of an acid that yields one mole of H ions or the mass of a base that reacts with one mole of H ions
That it is negative