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. How do you find wavelength if you known distance from adjacent crests and troughs?
Its twice that distance
Sp^3
180 degrees; when there is half a wave distance in phase between two waves
Half of the exponent


2. Can a catalyst shift equilibrium?
When all the external forces = zero
They do not differ
No - it increases the speed at which the rxn reaches that equilibrium
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c


3. The temperature of a metal will not increase above its melting point until what?
Total internal reflection
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting
One mole of electric charge
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R


4. Considering the answer in the last slide - what kind of a solution would have a lower freezing pt?
Mv = mv
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
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
One that has more solute particles per liter of solution


5. What does spatial resolution refer to?
Colligative: it depends on the number of solute molecules in a given volume of water
It will increase as well because they are directly related - only if pressure is kept constant
Neutrons; atomic number
Ability to locate an event in space


6. 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?
Ease of polarizability of the molecule and thus increasing molecular weight of mass
Constant to overcome the heat of fusion (solid to liquid state)
The particle's charge and the magnitude of the electric field
Add them together


7. What is the equation for work done?
Electrons from anode and battery
Vertically; perpendicular to all surfaces
Mv = mv
W = F(displacement)


8. Half-sine wave shape is what kind of wavelength with regards to length?
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
Zero
L = wavelength/2 so L= (wavelength)(2)
180 degrees; when there is half a wave distance in phase between two waves


9. 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
Isolating an atom from minerals by decomposing the minerals with an electric current
Quantum number that dictates the shape of an orbital; how many angular nodes are present? Spherical shape with no angular nodes thus you have 0 for angular momentum quantum number
A salt and water


10. How do you find 'g' from Newton's law of gravity?
It has a positive oxidation potential so it is easily oxidized
It decreases; the work done by the gas in expanding decreases its internal energy
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2


11. The number of incident photons on the cathode affect what?
The number of electrons emitted
One that has more solute particles per liter of solution
They increase because you hear a lower frequency
One mole of electric charge


12. Why is it important that the materials used as scintillators are nearly transparent to the wavelength of light they emit?
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
Cathode; anode
It minimizes the reabsorption of the light because the light must exit the scintillator to reach the photomultiplier where it is converted to an electrical pulse
(+)


13. The equivalence pt is what part of the titration curve? Thus looking at the range of change between the pH values along this part of the graph can tell you what?

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14. 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?
Polar
When HIn is turned into In- - which is dependent upon the pKa of the indicator
(+)
Density (gravitational constant) height


15. What is Newton's Universal Law of Gravitation?
Constant to overcome the heat of fusion (solid to liquid state)
F = GMm/r^2
Total internal reflection
The element's mass number


16. Kb is the equilibrium constant for what?
The reaction between the base and water
That of static friction; there is a net accelerating force on the block once it starts to slide
A saturated solution in which the aqueous ions are in equilibrium with the solid
The volume of the ice cube or whatever it is


17. When something is falling what is the force acting on it? Thus what would be the work done?

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18. Is the work done by air resistance - positive or negative?
V/m or N/C
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant
It can also equal 'mg'; the compressive strength of a substance
Negative


19. If any species is gotten rid of when combining two equations of chemical rxns together what can you conclude about those species?
Electrons from anode and battery
The element's mass number
Faraday/electrons
That they are catalysts in the rxn because they react with the substrate and are reformed


20. Always remember that velocity has ____ and ____
Mag and direction
Voltage
Toward the side with more gaseous molecules; towards the side that doesn't give off as much heat (remember heat is given off when molecules are formed and thus (-) enthalpy)
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


21. How do you find what is the limiting reagent? You can then use the moles of the limiting reagent to calculate what?
The force along the board to the normal force
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
The buoyant force on it; W = mg = pVg
You see how many moles of each are present and the one with the least is limiting; calculate how many grams/moles of a product will be made


22. What is Avagadro's number regarding ions/mol?
Isolating an atom from minerals by decomposing the minerals with an electric current
6.02 x 10^23 ions/mol
[S][2S]^2 = 4S^3
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


23. Isotopes have diff number of ______ but same what?
Neutrons; atomic number
It's weight = mg; h
You look at how many electrons are needed to reduce one cmpd and that number will be put in front of that cmpd and you do the same thing that's oxidized as well: review #38 on test #11
You look at what is being oxidized and reduced in the problem


24. How do you find moles of a substance when you are given faradays and electrons?
The nucleus gains a proton and no neutrons
Faraday/electrons
Total internal reflection
When HIn is turned into In- - which is dependent upon the pKa of the indicator


25. What is the angular momentum quantum number (l)? It is the same as what? What does an S orbital appear to look like? What would it's (l) be?
1) Young's Modulus 2) Shear Modulus 3) Bulk Modulus
H has a small atomic radius
It experiences a constant electric force of qE and will thus accelerate towards the positive plate
Quantum number that dictates the shape of an orbital; how many angular nodes are present? Spherical shape with no angular nodes thus you have 0 for angular momentum quantum number


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

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27. Mechanical waves in a medium fxn to transport what?
Density (gravitational constant) height
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting
Energy
Total internal reflection


28. A plane mirror produces an image where?
Helium; 4
It can also equal 'mg'; the compressive strength of a substance
Its intensity in the spectrum
At an equal distance behind it as the object is in front of the mirror


29. In a rxn - how do you figure out which atom has the highest electron affinity?
Toward the side with more gaseous molecules; towards the side that doesn't give off as much heat (remember heat is given off when molecules are formed and thus (-) enthalpy)
Shorter than it should be so rays from a distant object form in front of retina; use divergent lens
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces
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


30. Heat from friction comes from what?
When you have central atom with six ions on it
When electron falls from high energy to low energy level
Decreasing potential energy
The number of electrons emitted


31. How do you find the equiv capacitance of capacitors in series and parallel? What about if you are trying to find equivalent resistance?
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
P = IV
It will be reduced the voltage produced by the resistor which means IR; E- IR


32. Acetic acid is a ______ solvent
Polar
P = F(v) = mg(v -terminal)
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)


33. What is the net result on a nucleus when you absorb a deuturon and emit a neutron?
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles
Voltage
The nucleus gains a proton and no neutrons
Going from solid to gas phase


34. How would you find rate of rxn from pH 1 to pH2?
Mag and direction
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
W = F(displacement)
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


35. An oxidation-reduction rxn that occurs spontaneously has what kind of E^o for the cell?
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
A function of the total number of molecules; if there is one mol of CO2 for every 2 mol of H20 then H20 is 2/3 the total pressure
Positive
Neutrons; atomic number


36. 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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37. In Bohr model of atom when is energy emitted?
Positive
Accelerated by a higher voltage between the cathode and anode
They are directly proportional
When electron falls from high energy to low energy level


38. When does red litmus paper turn blue?
In the presence of a base
It's weight = mg; the work would be the weight times the distance fell
T = 2pi/angular velocity; v/r
The force along the board to the normal force


39. What type of acid and base would produce a pH closest to 7?
The lowest whole number ratio of moles of each element in a mole of a cmpd
The buoyant force on it; W = mg = pVg
You see how many moles of each are present and the one with the least is limiting; calculate how many grams/moles of a product will be made
Strong acid and strong base/ weak acid and weak base


40. The volume of an object is equal to water?
Strong acid and strong base/ weak acid and weak base
Colligative: it depends on the number of solute molecules in a given volume of water
Half of the exponent
Liquid displaced by that object


41. If you are given density and volume how do you find mass?
They must balance
(density[p])(volume)
[A]^a[B]^b
Its twice that distance


42. What are the three separate module for tensile stress - shear stress - and compression/expansion?

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43. What is one faraday equal to?
Accelerated by a higher voltage between the cathode and anode
One mole of electric charge
It will increase as well because they are directly related - only if pressure is kept constant
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant


44. The square root of 10^anything is equal to what?
The element's mass number
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles
Polar
Half of the exponent


45. What would the force be of a block on a pulley? What would be its displacement?

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46. If you have longer wavelengths how is their freq and energy compared to shorter wavelengths?
A constant force on a mass causes it to have a constant acceleration
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant
+/- 1/2


47. So if you have a voltage of 1/4V it will be reduced by what? Thus what will be the equation for the terminal voltage?
A salt and water
It will be reduced the voltage produced by the resistor which means IR; E- IR
The element's mass number
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


48. What is a metathesis rxn?
Momentum
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
Polar
It can also equal 'mg'; the compressive strength of a substance


49. If the standard potential for a rxn is negative when it is being reduced (thus a negative reduction potential) that means that the resulting atom has what?
It has a positive oxidation potential so it is easily oxidized
Mag and direction
P = F(v) = mg(v -terminal)
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous


50. What energy conversion describes best what takes place in a battery-powered resistive circuit?
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting
The lowest one
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
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