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DSST Physical Sciences2

Subjects : dsst, science

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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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. What gas is evolved when copper is placed in a nitric acid (HNO3) solution? This is what type of rxn?
NO; reduction-oxidation
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting
W = F(displacement)
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)

2. Terminal voltage is provided to what?
External components of the circuit
The density of the water and volume of the lead object
-l to +l
Colligative: it depends on the number of solute molecules in a given volume of water

3. The temperature of a metal will not increase above its melting point until what?
Red
Its twice that distance
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting
Yes - if the particle's trail is equidistant between two adjacent anodes

4. What is usually conserved over oscillation periods?
Total internal reflection
It has a positive oxidation potential so it is easily oxidized
Energy
[S][2S]^2 = 4S^3

5. What is sublimation?
Energy
H = negative and S = positive
One mole of electric charge
Going from solid to gas phase

6. Why would a solution with unfilled orbitals be responsible for turning a solution a certian color?
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
That it is negative
It can absorb light that lets other electrons fill those orbitals
A saturated solution in which the aqueous ions are in equilibrium with the solid

7. What happens to a negatively charged particle put between two parallel plates?
Cathode; anode
Mv = mv
It experiences a constant electric force of qE and will thus accelerate towards the positive plate
It's weight = mg; the work would be the weight times the distance fell

8. What if the circuit elements are in series?
It can also equal 'mg'; the compressive strength of a substance
The current is the same
F =ma and F= qE
Neutrons; atomic number

9. What is the relationship between P and n in PV=nRT?
They are directly proportional
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 path is longer on the inclined plane so it will take object longer to reach the bottom
Density (gravitational constant) height

10. if lead is successively preciptated as PbSO4 - PbI - and PbCO2 - which is less soluble than which? Thus which anions will be precipitated first?
7 always!!!
Decreasing potential energy
Its twice that distance
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4

11. What is Avagadro's number regarding ions/mol?
6.02 x 10^23 ions/mol
Electrons from anode and battery
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
Add them together

12. Friction is caused by what?
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure
Attractive molecular forces acting between material surfaces in contact
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
Isolating an atom from minerals by decomposing the minerals with an electric current

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

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14. If both weight and bouyant force are dependent on g - that makes g independent of what?
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 volume of the ice cube or whatever it is
Mass number stays the same but the atomic number increases
F = GMm/r^2

15. How do you find specific gravity of an object?
L = wavelength/2 so L= (wavelength)(2)
Mass number stays the same but the atomic number increases
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
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

16. How do you find the equiv capacitance of capacitors in series and parallel? What about if you are trying to find equivalent resistance?
When HIn is turned into In- - which is dependent upon the pKa of the indicator
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)
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
In the presence of a base

17. When you are trying to find the buyoancy force of water on a lead object what density do you use in the equation B = pVg? what volume?
Negative
The density of the water and volume of the lead object
The nucleus gains a proton and no neutrons
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

18. The Ksp for a substance of AaBb is what?
[A]^a[B]^b
+/- 1/2
Half of the exponent
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces

19. The electrons emitted from cathode are replaced with what?
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
Mag and direction
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
Electrons from anode and battery

20. If something is very toxic to a human - what Ksp value should it have for it to be the safest?
Yes - if the particle's trail is equidistant between two adjacent anodes
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
The lowest one
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

21. Isotopes have diff number of ______ but same what?
Neutrons; atomic number
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
When HIn is turned into In- - which is dependent upon the pKa of the indicator
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant

22. Half-sine wave shape is what kind of wavelength with regards to length?
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
Shorter than it should be so rays from a distant object form in front of retina; use divergent lens
L = wavelength/2 so L= (wavelength)(2)
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors

23. An oxidation-reduction rxn that occurs spontaneously has what kind of E^o for the cell?
Positive
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
One that has more solute particles per liter of solution
[S][2S]^2 = 4S^3

24. The coefficient of static friction is the ratio of what?
Faraday/electrons
The force along the board to the normal force
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio
Its twice that distance

25. What do electrolytic techniques involve?
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
Isolating an atom from minerals by decomposing the minerals with an electric current
[S][2S]^2 = 4S^3
The buoyant force on it; W = mg = pVg

26. An alpha particle can also be assumed to be what element? What is the mass number of Helium?
The current is the same
Negative
It experiences a constant electric force of qE and will thus accelerate towards the positive plate
Helium; 4

27. When an element decreases its atomic number by one what is emitted?
Positron because this is known as positron decay/electron capture
Shorter than it should be so rays from a distant object form in front of retina; use divergent lens
Strong acid and strong base/ weak acid and weak base
Liquid displaced by that object

28. In order to increase the kinetic energy of electrons - they must be what?
Accelerated by a higher voltage between the cathode and anode
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
Positron emission
The nucleus gains a proton and no neutrons

29. If any species is gotten rid of when combining two equations of chemical rxns together what can you conclude about those species?
External components of the circuit
Mass number stays the same but the atomic number increases
That they are catalysts in the rxn because they react with the substrate and are reformed
3+

30. What kind of metals react violently with water?
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
Alkali metals = first column
The number of electrons emitted
[S][2S]^2 = 4S^3

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

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32. 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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33. When is a body in translational equilibrium?
When all the external forces = zero
H = negative and S = positive
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 cross-sectional area through which the fluid flows

34. What energy conversion describes best what takes place in a battery-powered resistive circuit?
The volume of the ice cube or whatever it is
Strong acid and strong base/ weak acid and weak base
That of static friction; there is a net accelerating force on the block once it starts to slide
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors

35. What is the magnetic quantum number?
-l to +l
Its momentum is zero because velocity is zero; zero because of conservation of momentum
They increase because you hear a lower frequency
You look at what is being oxidized and reduced in the problem

36. The probability of an X-ray emission event at a given wavelength is measured by what?
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
Its intensity in the spectrum
Attractive molecular forces acting between material surfaces in contact
When HIn is turned into In- - which is dependent upon the pKa of the indicator

37. What is the doppler equation for wavelength and frequency?
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c
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
How strong a base is
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure

38. 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?
0 Hz because they are traveling side by side at the same speed
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces
How strong a base is
(density[p])(volume)

39. The boiling point of a solution is what type of property? Which means is depends only on what?
Colligative: it depends on the number of solute molecules in a given volume of water
Accelerated by a higher voltage between the cathode and anode
Electron shell number
Colligative; the number of solute particles present

40. In a rxn - how do you figure out which atom has the highest electron affinity?
L = wavelength/2 so L= (wavelength)(2)
Alkali metals = first column
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
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R

41. How do you figure out the literature Ksp value of a compound?
It can absorb light that lets other electrons fill those orbitals
H has a small atomic radius
(density[p])(volume)
A saturated solution in which the aqueous ions are in equilibrium with the solid

42. How do you find wavelength if you known distance from adjacent crests and troughs?
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
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect
Its twice that distance
The cross-sectional area through which the fluid flows

43. When you are trying to calculate a galvanic cell's emf - what do you look at?
You look at what is being oxidized and reduced in the problem
Yes - if the particle's trail is equidistant between two adjacent anodes
P = IV
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed

44. What is the formula for the power supplied by a battery to accelerate an electron beam?
The force along the board to the normal force
Helium; 4
P = IV
At an equal distance behind it as the object is in front of the mirror

45. What is conserved in an inellastic collision?
Momentum
It can also equal 'mg'; the compressive strength of a substance
Faraday/electrons
Colligative; the number of solute particles present

46. 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?
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
(density[p])(volume)
(+)
Isolating an atom from minerals by decomposing the minerals with an electric current

47. The closer the spacing of the anode wire - the better one can specify what?
Where an event took place
Yes - if the particle's trail is equidistant between two adjacent anodes
Its intensity in the spectrum
The lowest one

48. A cmpd with the lowest carbon to oxygen ratio will require how much oxygen for combustion?
At an equal distance behind it as the object is in front of the mirror
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio
H has a small atomic radius
Total internal reflection

49. 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
When all the external forces = zero
Its intensity in the spectrum
The lowest one

50. The freezing point of an aqueous solution is what kind of property? What does this mean?
Faraday/electrons
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
Colligative: it depends on the number of solute molecules in a given volume of water
The lowest whole number ratio of moles of each element in a mole of a cmpd