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DSST Physical Sciences2

Subjects : dsst, science

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. What is the relationship between P and n in PV=nRT?
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
Negative
They are directly proportional
A salt and water

2. Considering the answer in the last slide - what kind of a solution would have a lower freezing pt?
H has a small atomic radius
L = wavelength/2 so L= (wavelength)(2)
Energy
One that has more solute particles per liter of solution

3. What gas is evolved when copper is placed in a nitric acid (HNO3) solution? This is what type of rxn?
NO; reduction-oxidation
Mass number stays the same but the atomic number increases
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces
Sp^3

4. 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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5. Does the temperature of a water bath or amount of water in a water bath determines if a substance melts?
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
Only temperature of the water bath
It can also equal 'mg'; the compressive strength of a substance
The force along the board to the normal force

6. Always remember that velocity has ____ and ____
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect
Total internal reflection
Mag and direction
It will be reduced the voltage produced by the resistor which means IR; E- IR

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

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8. What is the spin projection quantum number?
Its twice that distance
It decreases; the work done by the gas in expanding decreases its internal energy
+/- 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

9. A floating ice cube implies that it's weight is balanced by what?
The buoyant force on it; W = mg = pVg
The reaction between the base and water
7 always!!!
Only temperature of the water bath

10. What is the amt of energy that a frictional force generates?
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
Force times the distance over which the force acts
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
Alkali metals = first column

11. What is Avagadro's number regarding ions/mol?
That it is negative
6.02 x 10^23 ions/mol
400 to 700 nm
One mole of electric charge

12. Mechanical waves in a medium fxn to transport what?
F = GMm/r^2
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
H has a small atomic radius
Energy

13. What is the equation for pressure?
When electron falls from high energy to low energy level
Only temperature of the water bath
Density (gravitational constant) height
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

14. How do the final velocities differ if a sphere is dropped from a distance rather than rolled down an inclined plane?
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect
They do not differ
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
They are directly proportional

15. When is a body in translational equilibrium?
Yes - if the particle's trail is equidistant between two adjacent anodes
Helium; 4
When all the external forces = zero
One that has more solute particles per liter of solution

16. 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?
Yes - if the particle's trail is equidistant between two adjacent anodes
Red
W = F(displacement)
0 Hz because they are traveling side by side at the same speed

17. What happens to a negatively charged particle put between two parallel plates?
+/- 1/2
It can also equal 'mg'; the compressive strength of a substance
It experiences a constant electric force of qE and will thus accelerate towards the positive plate
One that has more solute particles per liter of solution

18. 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?
From peak to peak
It will be reduced the voltage produced by the resistor which means IR; E- IR
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces
How strong a base is

19. The free energy change (G) must be negative when what?
H = negative and S = positive
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water
The density of the water and volume of the lead object
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

20. How do you find the equiv capacitance of capacitors in series and parallel? What about if you are trying to find equivalent resistance?
W = F(displacement)
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
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
Density (gravitational constant) height

21. What kind of charge is on Al?
A saturated solution in which the aqueous ions are in equilibrium with the solid
3+
Mag and direction
It has a positive oxidation potential so it is easily oxidized

22. If something is very toxic to a human - what Ksp value should it have for it to be the safest?
They increase because you hear a lower frequency
How strong a base is
The lowest one
That it is negative

23. Can a catalyst shift equilibrium?
No - it increases the speed at which the rxn reaches that equilibrium
-l to +l
External components of the circuit
Only temperature of the water bath

24. How do you figure out the literature Ksp value of a compound?
Energy
A saturated solution in which the aqueous ions are in equilibrium with the solid
Going from solid to gas phase
Its momentum is zero because velocity is zero; zero because of conservation of momentum

25. 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?
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
That of static friction; there is a net accelerating force on the block once it starts to slide
External components of the circuit
The current is the same

26. Acetic acid is a ______ solvent
Polar
They increase because you hear a lower frequency
Colligative: it depends on the number of solute molecules in a given volume of water
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

27. What is weight equal to?
Ease of polarizability of the molecule and thus increasing molecular weight of mass
Mg
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
One mole of electric charge

28. The basicity constant Kb measures what?
The number of electrons emitted
The force along the board to the normal force
How strong a base is
That of static friction; there is a net accelerating force on the block once it starts to slide

29. What is the unit for Young's Modulus?
In the presence of a base
The lowest one
It will increase as well because they are directly related - only if pressure is kept constant
Pascal (N*m^2)

30. What are the three separate module for tensile stress - shear stress - and compression/expansion?

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31. When looking at which combo of acids and bases will result in a solution with pH of 7 what do we look for?
Red
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
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
H = negative and S = positive

32. What do electrolytic techniques involve?
The volume of the ice cube or whatever it is
Red
Isolating an atom from minerals by decomposing the minerals with an electric current
Liquid displaced by that object

33. 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?
That it is negative
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water
Its momentum is zero because velocity is zero; zero because of conservation of momentum
1000

34. What is the hybridization of oxygen in water and other oxygens similar to water with two bonds and two lone pairs of electrons?
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)
Mg
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles
Sp^3

35. What is usually conserved over oscillation periods?
The nucleus gains a proton and no neutrons
An odd number
Energy
The mass number stays the number but the atomic number decreases by one - usually resulting in another element

36. How would you find rate of rxn from pH 1 to pH2?
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 can also equal 'mg'; the compressive strength of a substance
How strong a base is
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

37. When an element decreases its atomic number by one what is emitted?
Electrons from anode and battery
Positron because this is known as positron decay/electron capture
Red
Light is absorbed and re-emitted by the atomic structure of the optically dense medium

38. The number of incident photons on the cathode affect what?
They are directly proportional
Force times the distance over which the force acts
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting
The number of electrons emitted

39. Why would a solution with unfilled orbitals be responsible for turning a solution a certian color?
[S][2S]^2 = 4S^3
T = 2pi/angular velocity; v/r
It can absorb light that lets other electrons fill those orbitals
Colligative; the number of solute particles present

40. Pressure in a liquid is proportional to what? So why does this explain why blood pressure is greater in legs?
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
Gravity
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 height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)

41. The force on an electrical charge is what?
F =ma and F= qE
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
That it is negative
(+)

42. So if you are given an equation and it gives you the E^o for both side equations seen in the big equation - what do you do with them?
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
They do not differ
B = pVg; density
Add them together

43. Why is it important that the materials used as scintillators are nearly transparent to the wavelength of light they emit?
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
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
1) Young's Modulus 2) Shear Modulus 3) Bulk Modulus
Gravity

44. A nearsighted person has what type of focal length? Thus what do we do to correct this?
How strong a base is
The density of the water and volume of the lead object
Shorter than it should be so rays from a distant object form in front of retina; use divergent lens
-l to +l

45. How do you find specific gravity of an object?
400 to 700 nm
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure
Constant to overcome the heat of fusion (solid to liquid state)
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

46. A cmpd with the lowest carbon to oxygen ratio will require how much oxygen for combustion?
Polar
A saturated solution in which the aqueous ions are in equilibrium with the solid
0 Hz because they are traveling side by side at the same speed
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio

47. What is Newton's Universal Law of Gravitation?
From peak to peak
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
F = GMm/r^2
They must balance

48. When you are trying to calculate a galvanic cell's emf - what do you look at?
A saturated solution in which the aqueous ions are in equilibrium with the solid
External components of the circuit
Negative
You look at what is being oxidized and reduced in the problem

49. The phase difference corresponding to a half wave is what? When do you get destructive interference?
180 degrees; when there is half a wave distance in phase between two waves
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
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
Add them together

50. 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
Electron shell number
Mag and direction
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant