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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. Thus is Zn (which has positive oxidation potential) reacts with HCl - will any rxn take place?
-l to +l
Alkali metals = first column
An odd number
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed

2. What are the units of an electric field?
When you have central atom with six ions on it
No - it increases the speed at which the rxn reaches that equilibrium
V/m or N/C
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

3. What kind of charge is on Al?
(+)
The cross-sectional area through which the fluid flows
The volume of the ice cube or whatever it is
3+

4. How should the period of a waveform be calculated?
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 that has more solute particles per liter of solution
They must balance
From peak to peak

5. Beta decay is the emission of what? How do you know what it is the emission of?
An odd number
It can absorb light that lets other electrons fill those orbitals
E = (kq)/r^2
A positron or electron; when atomic number goes up you know an electron has been emitted

6. What does specific heat of a substance tell you? Thus what does a higher specific heat tell you?
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio
Energy
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
7 always!!!

7. If something is very toxic to a human - what Ksp value should it have for it to be the safest?
The lowest one
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
A salt and water
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting

8. The visible spectrum ranges from ____ to _____
P = IV
Strong acid and strong base/ weak acid and weak base
400 to 700 nm
Negative

9. What is Avagadro's number regarding ions/mol?
The cross-sectional area through which the fluid flows
Electrons from anode and battery
+/- 1/2
6.02 x 10^23 ions/mol

10. Light can be carried along a distance within a transparent material by means of what?
Total internal reflection
Positron because this is known as positron decay/electron capture
Gravity
T = (2h/g)^1/2; distance = vt

11. 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
1) Young's Modulus 2) Shear Modulus 3) Bulk Modulus
In the presence of a base
It experiences a constant electric force of qE and will thus accelerate towards the positive plate

12. 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?
180 degrees; when there is half a wave distance in phase between two waves
(+)
Mg
Density (gravitational constant) height

13. How do you find specific gravity of an object?
How strong a base is
That they are catalysts in the rxn because they react with the substrate and are reformed
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
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

14. The temperature of a metal will not increase above its melting point until what?
+/- 1/2
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting
H = negative and S = positive
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water

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

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16. The phase difference corresponding to a half wave is what? When do you get destructive interference?
3+
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
It decreases; the work done by the gas in expanding decreases its internal energy
180 degrees; when there is half a wave distance in phase between two waves

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

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18. If you have circuit elements in parallel what is the same across them?
Mg
(+)
Voltage
The volume of the ice cube or whatever it is

19. In a healthy person standing at rest - a comparison of arterial blood pressure measured in the arm with that in the leg - shows what about the differences between these pressures?
H = negative and S = positive
Polar
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure
P = F(v) = mg(v -terminal)

20. The force on an electrical charge is what?
Electrons from anode and battery
F =ma and F= qE
Cathode; anode
Total internal reflection

21. What is the spin projection quantum number?
They do not differ
Sp^3
The force along the board to the normal force
+/- 1/2

22. What is conserved in an inellastic collision?
Momentum
Accelerated by a higher voltage between the cathode and anode
The force along the board to the normal force
You look at what is being oxidized and reduced in the problem

23. How many mL is in one liter?
1000
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting
Positive
Pascal (N*m^2)

24. 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?
Decreasing potential energy
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
The density of the water and volume of the lead object
It decreases; the work done by the gas in expanding decreases its internal energy

25. What is the principal quantum number (n)?
At an equal distance behind it as the object is in front of the mirror
An odd number
7 always!!!
Electron shell number

26. Pressure in a liquid is proportional to what? So why does this explain why blood pressure is greater in legs?
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
They must balance
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)

27. What is weight equal to?
Only temperature of the water bath
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces
[S][2S]^2 = 4S^3
Mg

28. If melting pt of a substance is 80 degrees - then what is the diff in time the substance melts when it is either placed in 100 degree test tube and 90 degree test tube?
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
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
It will be reduced the voltage produced by the resistor which means IR; E- IR

29. How do you find length of time something is in flight? How do you find distance it traveled?
Ability to locate an event in space
-l to +l
T = (2h/g)^1/2; distance = vt
That it is negative

30. What is the equation for pressure?
Its twice that distance
Density (gravitational constant) height
Gravity
L = wavelength/2 so L= (wavelength)(2)

31. In PV=nRT - if temp increases what will happen to volume?
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
It will increase as well because they are directly related - only if pressure is kept constant
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed

32. How do you find moles of a substance when you are given faradays and electrons?
When HIn is turned into In- - which is dependent upon the pKa of the indicator
The force along the board to the normal force
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect
Faraday/electrons

33. What is the amt of energy that a frictional force generates?
Constant to overcome the heat of fusion (solid to liquid state)
Force times the distance over which the force acts
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
Electron shell number

34. When you are trying to calculate a galvanic cell's emf - what do you look at?
[S][2S]^2 = 4S^3
Colligative; the number of solute particles present
Mass number stays the same but the atomic number increases
You look at what is being oxidized and reduced in the problem

35. In a rxn - how do you figure out which atom has the highest electron affinity?
Attractive molecular forces acting between material surfaces in contact
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
(density[p])(volume)
They are directly proportional

36. Always remember that velocity has ____ and ____
NO; reduction-oxidation
Mag and direction
A salt and water
Strong acid and strong base/ weak acid and weak base

37. Can a catalyst shift equilibrium?
No - it increases the speed at which the rxn reaches that equilibrium
Polar
The cross-sectional area through which the fluid flows
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

38. How do the final velocities differ if a sphere is dropped from a distance rather than rolled down an inclined plane?
(+)
They do not differ
In the presence of a base
When all the external forces = zero

39. 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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40. How do you find the equiv capacitance of capacitors in series and parallel? What about if you are trying to find equivalent resistance?
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
The lowest whole number ratio of moles of each element in a mole of a cmpd
Constant to overcome the heat of fusion (solid to liquid state)

41. What is the equation for work done?
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
W = F(displacement)
At an equal distance behind it as the object is in front of the mirror

42. A plane mirror produces an image where?
Isolating an atom from minerals by decomposing the minerals with an electric current
Momentum
An odd number
At an equal distance behind it as the object is in front of the mirror

43. Does the temperature of a water bath or amount of water in a water bath determines if a substance melts?
The mass number stays the number but the atomic number decreases by one - usually resulting in another element
Helium; 4
Its intensity in the spectrum
Only temperature of the water bath

44. A nearsighted person has what type of focal length? Thus what do we do to correct this?
Shorter than it should be so rays from a distant object form in front of retina; use divergent lens
A saturated solution in which the aqueous ions are in equilibrium with the solid
(density[p])(volume)
Mg

45. What kind of geometry is octahedral?
Liquid displaced by that object
An odd number
That it is negative
When you have central atom with six ions on it

46. The free energy change (G) must be negative when what?
Negative
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water
T = (2h/g)^1/2; distance = vt
H = negative and S = positive

47. 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?
Positive
6.02 x 10^23 ions/mol
It's weight = mg; h
0 Hz because they are traveling side by side at the same speed

48. When a falling mass is at terminal speed - what is the power expended by the air resistance?
P = F(v) = mg(v -terminal)
1) Young's Modulus 2) Shear Modulus 3) Bulk Modulus
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
They increase because you hear a lower frequency

49. A pendulum moves under the influence of what?
Gravity
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
Going from solid to gas phase
E = (kq)/r^2

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
The mass number stays the number but the atomic number decreases by one - usually resulting in another element
T = 2pi/angular velocity; v/r
It decreases; the work done by the gas in expanding decreases its internal energy

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DSST Physical Sciences2

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