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. Why is it important that the materials used as scintillators are nearly transparent to the wavelength of light they emit?
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
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
400 to 700 nm
When electron falls from high energy to low energy level


2. The closer the spacing of the anode wire - the better one can specify what?
H = negative and S = positive
Where an event took place
Cathode; anode
Faraday/electrons


3. What is a metathesis rxn?
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
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
Positive
Gravity


4. If the source of sound and the listener are traveling side by side at the same speed - what will the change in freq heard by the listener be?
Total internal reflection
0 Hz because they are traveling side by side at the same speed
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)
One mole of electric charge


5. How do you find wavelength if you known distance from adjacent crests and troughs?
7 always!!!
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
Its twice that distance
Decreasing potential energy


6. The volume of an object is equal to water?
Only temperature of the water bath
Liquid displaced by that object
E = (kq)/r^2
Momentum


7. 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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8. How do you find what is the limiting reagent? You can then use the moles of the limiting reagent to calculate what?
Energy
Alkali metals = first column
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
T = 2pi/angular velocity; v/r


9. A plane mirror produces an image where?
The buoyant force on it; W = mg = pVg
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous
T = (2h/g)^1/2; distance = vt
At an equal distance behind it as the object is in front of the mirror


10. How do you balance redox rxns?

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11. Nuclear masses can be approximated from what?

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12. How do the final velocities differ if a sphere is dropped from a distance rather than rolled down an inclined plane?
180 degrees; when there is half a wave distance in phase between two waves
Liquid displaced by that object
External components of the circuit
They do not differ


13. Heat from friction comes from what?
The path is longer on the inclined plane so it will take object longer to reach the bottom
It decreases; the work done by the gas in expanding decreases its internal energy
Decreasing potential energy
The number of electrons emitted


14. Thus is Zn (which has positive oxidation potential) reacts with HCl - will any rxn take place?
0 Hz because they are traveling side by side at the same speed
NO; reduction-oxidation
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting


15. Why are bonds between H and another atom shorter compared to most?
Mass number stays the same but the atomic number increases
Red
One that has more solute particles per liter of solution
H has a small atomic radius


16. Neither N2 or O2 have a permanent what? What does this mean?
It's weight = mg; the work would be the weight times the distance fell
Voltage
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces


17. Considering the answer in the last slide - what kind of a solution would have a lower freezing pt?
One that has more solute particles per liter of solution
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
Its twice that distance
Total internal reflection


18. Why would a solution with unfilled orbitals be responsible for turning a solution a certian color?
A constant force on a mass causes it to have a constant acceleration
It can absorb light that lets other electrons fill those orbitals
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
Red


19. A pendulum moves under the influence of what?
Mg
When electron falls from high energy to low energy level
+/- 1/2
Gravity


20. An oxidation-reduction rxn that occurs spontaneously has what kind of E^o for the cell?
Positive
The path is longer on the inclined plane so it will take object longer to reach the bottom
It will be reduced the voltage produced by the resistor which means IR; E- IR
An odd number


21. A saturated solution of KNO3 means what? If you add salt that has any of these two ions what will happen? What is this called?
Its intensity in the spectrum
A constant force on a mass causes it to have a constant acceleration
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect
Attractive molecular forces acting between material surfaces in contact


22. What is weight equal to?
Mg
Energy
T = (2h/g)^1/2; distance = vt
Ability to locate an event in space


23. Pressure in a liquid is proportional to what? So why does this explain why blood pressure is greater in legs?
Polar
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
Mass number stays the same but the atomic number increases
Pascal (N*m^2)


24. 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's weight = mg; the work would be the weight times the distance fell
Energy
Mag and direction
It has a positive oxidation potential so it is easily oxidized


25. What type of acid and base would produce a pH closest to 7?
The element's mass number
Strong acid and strong base/ weak acid and weak base
Colligative; the number of solute particles present
Ability to locate an event in space


26. When looking at which combo of acids and bases will result in a solution with pH of 7 what do we look for?
[A]^a[B]^b
A salt and water
The cross-sectional area through which the fluid flows
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14


27. When is a body in translational equilibrium?
The buoyant force on it; W = mg = pVg
E = (kq)/r^2
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect
When all the external forces = zero


28. The total pressure of a solution is what? Give example.
3+
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
When electron falls from high energy to low energy level
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


29. Equivalent mass is what?
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
Energy
6.02 x 10^23 ions/mol
The force along the board to the normal force


30. How do you find moles of a substance when you are given faradays and electrons?
Faraday/electrons
It will increase as well because they are directly related - only if pressure is kept constant
One that has more solute particles per liter of solution
6.02 x 10^23 ions/mol


31. The number of incident photons on the cathode affect what?
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
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant
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 number of electrons emitted


32. 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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33. If you have an alcohol with OH on the end and then another cmpd with an O in the middle but no H - what is different between the bonds they can make with water?

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34. If temperature arises during a mixture what can you conclude about the enthalpy?
That it is negative
The force along the board to the normal force
Energy
Pascal (N*m^2)


35. If you are given density and volume how do you find mass?
(density[p])(volume)
Energy
Attractive molecular forces acting between material surfaces in contact
T = (2h/g)^1/2; distance = vt


36. How would you find rate of rxn from pH 1 to pH2?
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 number of electrons emitted
A saturated solution in which the aqueous ions are in equilibrium with the solid
At an equal distance behind it as the object is in front of the mirror


37. What is one faraday equal to?
Energy
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous
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 mole of electric charge


38. How do you find the equiv capacitance of capacitors in series and parallel? What about if you are trying to find equivalent resistance?
-l to +l
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
It has a positive oxidation potential so it is easily oxidized
3+


39. What is the equation for work done?
W = F(displacement)
Positive
When electron falls from high energy to low energy level
Red


40. The concentration of OH and H30 ions are approximately equal at what pH?
7 always!!!
Mv = mv
Density (gravitational constant) height
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


41. Mechanical waves in a medium fxn to transport what?
When all the external forces = zero
(density[p])(volume)
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
Energy


42. When does red litmus paper turn blue?
It has a positive oxidation potential so it is easily oxidized
Strong acid and strong base/ weak acid and weak base
In the presence of a base
1) Young's Modulus 2) Shear Modulus 3) Bulk Modulus


43. The square root of 10^anything is equal to what?
0 Hz because they are traveling side by side at the same speed
Half of the exponent
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
Its twice that distance


44. What do electrolytic techniques involve?
Isolating an atom from minerals by decomposing the minerals with an electric current
Pascal (N*m^2)
Faraday/electrons
Red


45. What does specific heat of a substance tell you? Thus what does a higher specific heat tell you?
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
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
Zero
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


46. What is the equation for pressure?
They are directly proportional
Zero
Where an event took place
Density (gravitational constant) height


47. At the moment of explosion of an object - what is its momementum? Why? After an explosion what is the total momentum carried by all the fragments?
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
Its momentum is zero because velocity is zero; zero because of conservation of momentum
6.02 x 10^23 ions/mol
When electron falls from high energy to low energy level


48. What is the magnitude of the electric field produced by a point charge?
6.02 x 10^23 ions/mol
-l to +l
That of static friction; there is a net accelerating force on the block once it starts to slide
E = (kq)/r^2


49. Does the temperature of a water bath or amount of water in a water bath determines if a substance melts?
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
Voltage
Only temperature of the water bath
Positive


50. If any species is gotten rid of when combining two equations of chemical rxns together what can you conclude about those species?
That they are catalysts in the rxn because they react with the substrate and are reformed
Yes - if the particle's trail is equidistant between two adjacent anodes
180 degrees; when there is half a wave distance in phase between two waves
Light is absorbed and re-emitted by the atomic structure of the optically dense medium