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DSST Physical Sciences2

Subjects : dsst, science

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Answer 50 questions in 15 minutes.
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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. 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?
Negative
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
0 Hz because they are traveling side by side at the same speed
Mag and direction

2. How should the period of a waveform be calculated?
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
From peak to peak
H = negative and S = positive
The mass number stays the number but the atomic number decreases by one - usually resulting in another element

3. 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
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
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water
The regular one

4. Mechanical waves in a medium fxn to transport what?
An odd number
When you have central atom with six ions on it
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
Energy

5. What energy conversion describes best what takes place in a battery-powered resistive circuit?
The reaction between the base and water
Liquid displaced by that object
Going from solid to gas phase
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors

6. When looking at which combo of acids and bases will result in a solution with pH of 7 what do we look for?
Electron shell number
It has a positive oxidation potential so it is easily oxidized
It will be reduced the voltage produced by the resistor which means IR; E- IR
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14

7. The Ksp for a substance of AaBb is 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
-l to +l
[A]^a[B]^b
Voltage

8. A pendulum moves under the influence of what?
A positron or electron; when atomic number goes up you know an electron has been emitted
Gravity
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
Helium; 4

9. What do electrolytic techniques involve?
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water
When all the external forces = zero
Isolating an atom from minerals by decomposing the minerals with an electric current

10. What is a metathesis rxn?
They are directly proportional
(density[p])(volume)
-l to +l
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

11. In a rxn - how do you figure out which atom has the highest electron affinity?
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
One that has more solute particles per liter of solution
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
-l to +l

12. In Bohr model of atom when is energy emitted?
When electron falls from high energy to low energy level
V/m or N/C
It has a positive oxidation potential so it is easily oxidized
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio

13. Why are bonds between H and another atom shorter compared to most?
H has a small atomic radius
It can also equal 'mg'; the compressive strength of a substance
Its momentum is zero because velocity is zero; zero because of conservation of momentum
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water

14. 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
It decreases; the work done by the gas in expanding decreases its internal energy
Attractive molecular forces acting between material surfaces in contact
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)

15. In radioactive decay the atomic number (A) and mass number (Z) must what?
The volume of the ice cube or whatever it is
They must balance
In the presence of a base
Momentum

16. The free energy change (G) must be negative when what?
-l to +l
3+
H = negative and S = positive
Ease of polarizability of the molecule and thus increasing molecular weight of mass

17. How do you find 'g' from Newton's law of gravity?
External components of the circuit
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
Only temperature of the water bath
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2

18. What color is above 656 nm?
It experiences a constant electric force of qE and will thus accelerate towards the positive plate
A constant force on a mass causes it to have a constant acceleration
Red
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

19. if lead is successively preciptated as PbSO4 - PbI - and PbCO2 - which is less soluble than which? Thus which anions will be precipitated first?
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c
L = wavelength/2 so L= (wavelength)(2)
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
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)

20. In a galvanic and electrolytic cell - reduction of an ion occurs where? Oxidation of an ion occurs where?
Cathode; anode
Red
P = F(v) = mg(v -terminal)
L = wavelength/2 so L= (wavelength)(2)

21. What are the units of an electric field?
Constant to overcome the heat of fusion (solid to liquid state)
Attractive molecular forces acting between material surfaces in contact
V/m or N/C
The path is longer on the inclined plane so it will take object longer to reach the bottom

22. What is conserved in an inellastic collision?
1000
Momentum
When electron falls from high energy to low energy level
When all the external forces = zero

23. What happens if an atom undergoes positron decay or electron capture?
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
Vertically; perpendicular to all surfaces
The path is longer on the inclined plane so it will take object longer to reach the bottom
The mass number stays the number but the atomic number decreases by one - usually resulting in another element

24. What does spatial resolution refer to?
That it is negative
External components of the circuit
Positron because this is known as positron decay/electron capture
Ability to locate an event in space

25. What is one faraday equal to?
Accelerated by a higher voltage between the cathode and anode
It decreases; the work done by the gas in expanding decreases its internal energy
One mole of electric charge
400 to 700 nm

26. How do you find wavelength if you known distance from adjacent crests and troughs?
NO; reduction-oxidation
The particle's charge and the magnitude of the electric field
Its twice that distance
Total internal reflection

27. What is the equation for pressure?
Density (gravitational constant) height
The density of the water and volume of the lead object
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
They must balance

28. What is the hybridization of oxygen in water and other oxygens similar to water with two bonds and two lone pairs of electrons?
The nucleus gains a proton and no neutrons
The volume of the ice cube or whatever it is
Sp^3
The number of electrons emitted

29. A cmpd with the lowest carbon to oxygen ratio will require how much oxygen for combustion?
Zero
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio
Cathode; anode
They are directly proportional

30. What happens to the atomic number and atomic mass of an element that go under Beta decay or positron emission?
The number of electrons emitted
Density (gravitational constant) height
Mass number stays the same but the atomic number increases
The reaction between the base and water

31. The probability of an X-ray emission event at a given wavelength is measured by what?
Its intensity in the spectrum
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces
In the presence of a base
Electron shell number

32. Always remember that velocity has ____ and ____
The number of electrons emitted
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
The particle's charge and the magnitude of the electric field
Mag and direction

33. 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?
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
Sp^3
Density (gravitational constant) height
Mv = mv

34. The number of incident photons on the cathode affect what?
Cathode; anode
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
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
The number of electrons emitted

35. 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?
When HIn is turned into In- - which is dependent upon the pKa of the indicator
No - it increases the speed at which the rxn reaches that equilibrium
(+)
The cross-sectional area through which the fluid flows

36. The freezing point of an aqueous solution is what kind of property? What does this mean?
Colligative: it depends on the number of solute molecules in a given volume of water
It can absorb light that lets other electrons fill those orbitals
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
Red

37. 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
0 Hz because they are traveling side by side at the same speed
Force times the distance over which the force acts
3+

38. If asked which electron configuration of an element is most stable which one do you choose?
The regular one
That they are catalysts in the rxn because they react with the substrate and are reformed
Half of the exponent
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting

39. What gas is evolved when copper is placed in a nitric acid (HNO3) solution? This is what type of rxn?
(+)
That they are catalysts in the rxn because they react with the substrate and are reformed
NO; reduction-oxidation
Colligative; the number of solute particles present

40. 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
1) Young's Modulus 2) Shear Modulus 3) Bulk Modulus
Colligative; the number of solute particles present

41. Is the work done by air resistance - positive or negative?
Add them together
Liquid displaced by that object
Negative
It will be reduced the voltage produced by the resistor which means IR; E- IR

42. What is different between an inclined plane and free fall?
The path is longer on the inclined plane so it will take object longer to reach the bottom
That it is negative
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
One that has more solute particles per liter of solution

43. F in the Young's modulus equation can also equal what? What is E?

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44. 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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45. How do you balance redox rxns?

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46. Neither N2 or O2 have a permanent what? What does this mean?
Total internal reflection
It will be reduced the voltage produced by the resistor which means IR; E- IR
A salt and water
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces

47. How do you find moles of a substance when you are given faradays and electrons?
+/- 1/2
Zero
Faraday/electrons
At an equal distance behind it as the object is in front of the mirror

48. What is Newton's Universal Law of Gravitation?
F = GMm/r^2
The reaction between the base and water
The cross-sectional area through which the fluid flows
T = (2h/g)^1/2; distance = vt

49. Why does light travel slower in an optically dense medium than through a vacuum?
Mg
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
The force along the board to the normal force
The current is the same

50. A floating ice cube implies that it's weight is balanced by what?
The buoyant force on it; W = mg = pVg
Pascal (N*m^2)
Attractive molecular forces acting between material surfaces in contact
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

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DSST Physical Sciences2

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