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DSST Physical Sciences2

Subjects : dsst, science

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Answer 50 questions in 15 minutes.
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1. What direction do gravity and bouyancy work? What direction does water pressure work?
Liquid displaced by that object
Isolating an atom from minerals by decomposing the minerals with an electric current
Vertically; perpendicular to all surfaces
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles

2. In Bohr model of atom when is energy emitted?
When electron falls from high energy to low energy level
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant
T = (2h/g)^1/2; distance = vt
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c

3. What is the doppler equation for wavelength and frequency?
You look at what is being oxidized and reduced in the problem
That of static friction; there is a net accelerating force on the block once it starts to slide
It has a positive oxidation potential so it is easily oxidized
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c

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

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5. What does the empirical formula show?
The lowest whole number ratio of moles of each element in a mole of a cmpd
The force along the board to the normal force
Ease of polarizability of the molecule and thus increasing molecular weight of mass
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

6. If something is very toxic to a human - what Ksp value should it have for it to be the safest?
When HIn is turned into In- - which is dependent upon the pKa of the indicator
Mag and direction
The lowest one
They increase because you hear a lower frequency

7. if lead is successively preciptated as PbSO4 - PbI - and PbCO2 - which is less soluble than which? Thus which anions will be precipitated first?
From peak to peak
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
Gravity

8. What type of acid and base would produce a pH closest to 7?
Strong acid and strong base/ weak acid and weak base
The regular one
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
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous

9. What is Newton's Universal Law of Gravitation?
Yes - if the particle's trail is equidistant between two adjacent anodes
External components of the circuit
F = GMm/r^2
It will increase as well because they are directly related - only if pressure is kept constant

10. 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?
P = F(v) = mg(v -terminal)
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
Voltage
The density of the water and volume of the lead object

11. In radioactive decay the atomic number (A) and mass number (Z) must 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
The path is longer on the inclined plane so it will take object longer to reach the bottom
Mass number stays the same but the atomic number increases
They must balance

12. The basicity constant Kb measures what?
Cathode; anode
How strong a base is
The lowest one
P = IV

13. Nuclear masses can be approximated from what?

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14. Charged particles in motion constitute what? Freely moving charges are deflected by what? The curved path depends on what?
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
Helium; 4
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
Vertically; perpendicular to all surfaces

15. In a rxn - how do you figure out which atom has the highest electron affinity?
Zero
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
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
They must balance

16. The free energy change (G) must be negative when what?
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure
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
H = negative and S = positive
It can absorb light that lets other electrons fill those orbitals

17. Strength of dispersion force increases with what?
7 always!!!
They increase because you hear a lower frequency
Ease of polarizability of the molecule and thus increasing molecular weight of mass
Yes - if the particle's trail is equidistant between two adjacent anodes

18. When the source of a sound is flying away from you what happens to the wavelengths from peak to peak?
They increase because you hear a lower frequency
A saturated solution in which the aqueous ions are in equilibrium with the solid
+/- 1/2
Positron emission

19. What is the principal quantum number (n)?
It's weight = mg; the work would be the weight times the distance fell
That they are catalysts in the rxn because they react with the substrate and are reformed
Electron shell number
0 Hz because they are traveling side by side at the same speed

20. What happens to the atomic number and atomic mass of an element that go under Beta decay or positron emission?
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
T = 2pi/angular velocity; v/r
Mass number stays the same but the atomic number increases
180 degrees; when there is half a wave distance in phase between two waves

21. The force on an electrical charge is what?
When electron falls from high energy to low energy level
F =ma and F= qE
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio
Decreasing potential energy

22. Considering the answer in the last slide - what kind of a solution would have a lower freezing pt?
That they are catalysts in the rxn because they react with the substrate and are reformed
One that has more solute particles per liter of solution
When HIn is turned into In- - which is dependent upon the pKa of the indicator
Accelerated by a higher voltage between the cathode and anode

23. 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
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
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
Light is absorbed and re-emitted by the atomic structure of the optically dense medium

24. What is the equation for bouyant force? What is p?
It can also equal 'mg'; the compressive strength of a substance
Accelerated by a higher voltage between the cathode and anode
A positron or electron; when atomic number goes up you know an electron has been emitted
B = pVg; density

25. For a given flow rate - the speed of fluid flow is inversely proportional to what?
The cross-sectional area through which the fluid flows
Only temperature of the water bath
Helium; 4
F =ma and F= qE

26. What is weight equal to?
Mg
0 Hz because they are traveling side by side at the same speed
Total internal reflection
The number of electrons emitted

27. A floating ice cube implies that it's weight is balanced by what?
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant
That it is negative
Isolating an atom from minerals by decomposing the minerals with an electric current
The buoyant force on it; W = mg = pVg

28. When you are trying to calculate a galvanic cell's emf - what do you look at?
Colligative: it depends on the number of solute molecules in a given volume of water
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
You look at what is being oxidized and reduced in the problem
Yes - if the particle's trail is equidistant between two adjacent anodes

29. The volume of an object is equal to water?
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting
Liquid displaced by that object
In the presence of a base

30. In order to increase the kinetic energy of electrons - they must be what?
7 always!!!
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
Accelerated by a higher voltage between the cathode and anode
Polar

31. The coefficient of static friction is the ratio of what?
The force along the board to the normal force
The particle's charge and the magnitude of the electric field
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

32. In general what is formed by an acid-base rxn?
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
A salt and water
Faraday/electrons
Energy

33. 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?
Going from solid to gas phase
It's weight = mg; the work would be the weight times the distance fell
It will be reduced the voltage produced by the resistor which means IR; E- IR
Its twice that distance

34. Light can be carried along a distance within a transparent material by means of what?
It can absorb light that lets other electrons fill those orbitals
That of static friction; there is a net accelerating force on the block once it starts to slide
Total internal reflection
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)

35. What happens if an atom undergoes positron decay or electron capture?
When you have central atom with six ions on it
The cross-sectional area through which the fluid flows
The mass number stays the number but the atomic number decreases by one - usually resulting in another element
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

36. What are the units of an electric field?
V/m or N/C
From peak to peak
It decreases; the work done by the gas in expanding decreases its internal energy
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces

37. What color is above 656 nm?
Red
The volume of the ice cube or whatever it is
P = IV
Mg

38. Pressure in a liquid is proportional to what? So why does this explain why blood pressure is greater in legs?
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
Decreasing potential energy
Colligative: it depends on the number of solute molecules in a given volume of water
Strong acid and strong base/ weak acid and weak base

39. What is the unit for Young's Modulus?
Total internal reflection
T = 2pi/angular velocity; v/r
It can absorb light that lets other electrons fill those orbitals
Pascal (N*m^2)

40. Beta decay is the same as what?
A saturated solution in which the aqueous ions are in equilibrium with the solid
Positron emission
From peak to peak
It can absorb light that lets other electrons fill those orbitals

41. How do you find wavelength if you known distance from adjacent crests and troughs?
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
Its twice that distance
W = F(displacement)
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure

42. The number of incident photons on the cathode affect what?
The number of electrons emitted
+/- 1/2
Red
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

43. What is the equation for a period (T)? What is the equation for angular velocity?
That of static friction; there is a net accelerating force on the block once it starts to slide
T = 2pi/angular velocity; v/r
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
[A]^a[B]^b

44. As a balloon rises in a tank of water what happens to the temperature inside it? Why would this happen?
Negative
180 degrees; when there is half a wave distance in phase between two waves
Red
It decreases; the work done by the gas in expanding decreases its internal energy

45. In PV=nRT - if temp increases what will happen to volume?
That they are catalysts in the rxn because they react with the substrate and are reformed
External components of the circuit
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

46. What is different between an inclined plane and free fall?
They must balance
Going from solid to gas phase
The path is longer on the inclined plane so it will take object longer to reach the bottom
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2

47. 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
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)
Yes - if the particle's trail is equidistant between two adjacent anodes
The number of electrons emitted

48. When a falling mass is at terminal speed - what is the power expended by the air resistance?
P = F(v) = mg(v -terminal)
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
The lowest one
An odd number

49. How do you find length of time something is in flight? How do you find distance it traveled?
Total internal reflection
T = (2h/g)^1/2; distance = vt
The regular one
The cross-sectional area through which the fluid flows

50. If both weight and bouyant force are dependent on g - that makes g independent of what?
(+)
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
They must balance
The volume of the ice cube or whatever it is

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DSST Physical Sciences2

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