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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.
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. 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
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure
It will increase as well because they are directly related - only if pressure is kept constant
Momentum

2. The phase difference corresponding to a half wave is what? When do you get destructive interference?
The lowest one
180 degrees; when there is half a wave distance in phase between two waves
Mag and direction
Liquid displaced by that object

3. What happens to the atomic number and atomic mass of an element that go under Beta decay or positron emission?
1000
Mass number stays the same but the atomic number increases
The number of electrons emitted
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)

4. When an element decreases its atomic number by one what is emitted?
Isolating an atom from minerals by decomposing the minerals with an electric current
Where an event took place
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
Positron because this is known as positron decay/electron capture

5. A cmpd with the lowest carbon to oxygen ratio will require how much oxygen for combustion?
180 degrees; when there is half a wave distance in phase between two waves
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio
Ability to locate an event in space
Faraday/electrons

6. If something is very toxic to a human - what Ksp value should it have for it to be the safest?
F = GMm/r^2
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
E = (kq)/r^2
The lowest one

7. What is the magnitude of the electric field produced by a point charge?
The regular one
You look at what is being oxidized and reduced in the problem
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant
E = (kq)/r^2

8. The closer the spacing of the anode wire - the better one can specify what?
Where an event took place
They do not differ
The number of electrons emitted
A constant force on a mass causes it to have a constant acceleration

9. If the standard potential for a rxn is negative when it is being reduced (thus a negative reduction potential) that means that the resulting atom has what?
Positive
It has a positive oxidation potential so it is easily oxidized
Density (gravitational constant) height
Mg

10. Half-sine wave shape is what kind of wavelength with regards to length?
Mg
P = IV
L = wavelength/2 so L= (wavelength)(2)
One that has more solute particles per liter of solution

11. Kb is the equilibrium constant for what?
The reaction between the base and water
Add them together
Attractive molecular forces acting between material surfaces in contact
H = negative and S = positive

12. if lead is successively preciptated as PbSO4 - PbI - and PbCO2 - which is less soluble than which? Thus which anions will be precipitated first?
One mole of electric charge
W = F(displacement)
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
Sp^3

13. The electrons emitted from cathode are replaced with what?
They are directly proportional
7 always!!!
Electrons from anode and battery
It has a positive oxidation potential so it is easily oxidized

14. The total pressure of a solution is what? Give example.
H has a small atomic radius
180 degrees; when there is half a wave distance in phase between two waves
(density[p])(volume)
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

15. Why are bonds between H and another atom shorter compared to most?
When electron falls from high energy to low energy level
When all the external forces = zero
H has a small atomic radius
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

16. The coefficient of static friction is the ratio of what?
Energy
A constant force on a mass causes it to have a constant acceleration
That it is negative
The force along the board to the normal force

17. Terminal voltage is provided to what?
Mv = mv
(density[p])(volume)
External components of the circuit
Decreasing potential energy

18. What is the equation for bouyant force? What is p?
Neutrons; atomic number
W = F(displacement)
B = pVg; density
Going from solid to gas phase

19. 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?
Positron because this is known as positron decay/electron capture
It can absorb light that lets other electrons fill those orbitals
0 Hz because they are traveling side by side at the same speed
Colligative: it depends on the number of solute molecules in a given volume of water

20. What is conserved in an inellastic collision?
Momentum
3+
Sp^3
The reaction between the base and water

21. What color is above 656 nm?
3+
Gravity
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
Red

22. Nuclear masses can be approximated from what?

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23. Strength of dispersion force increases with what?
That they are catalysts in the rxn because they react with the substrate and are reformed
When you have central atom with six ions on it
Ease of polarizability of the molecule and thus increasing molecular weight of mass
Vertically; perpendicular to all surfaces

24. Regarding M(OH)2 and you have solubility (S) - what would the Ksp be?
[S][2S]^2 = 4S^3
Positron because this is known as positron decay/electron capture
When electron falls from high energy to low energy level
Light is absorbed and re-emitted by the atomic structure of the optically dense medium

25. In order to guarantee a non-zero spin how many electrons are needed?
The regular one
An odd number
Mg
It has a positive oxidation potential so it is easily oxidized

26. What is the principal quantum number (n)?
3+
Isolating an atom from minerals by decomposing the minerals with an electric current
Electron shell number
F = GMm/r^2

27. 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
3+
Force times the distance over which the force acts
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles

28. Why does light travel slower in an optically dense medium than through a vacuum?
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
When all the external forces = zero
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
Force times the distance over which the force acts

29. What is the law of conservation of linear momentum?
From peak to peak
It's weight = mg; the work would be the weight times the distance fell
Mv = mv
Voltage

30. What is the formula for the power supplied by a battery to accelerate an electron beam?
P = IV
It's weight = mg; the work would be the weight times the distance fell
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
[A]^a[B]^b

31. An alpha particle can also be assumed to be what element? What is the mass number of Helium?
From peak to peak
Helium; 4
Ability to locate an event in space
Ease of polarizability of the molecule and thus increasing molecular weight of mass

32. Does the temperature of a water bath or amount of water in a water bath determines if a substance melts?
Only temperature of the water bath
E = (kq)/r^2
[A]^a[B]^b
Total internal reflection

33. What is one faraday equal to?
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
H has a small atomic radius
One mole of electric charge
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

34. What is the spin projection quantum number?
Energy
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
A saturated solution in which the aqueous ions are in equilibrium with the solid
+/- 1/2

35. How do you find 'g' from Newton's law of gravity?
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
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
+/- 1/2

36. Is the work done by air resistance - positive or negative?
B = pVg; density
Negative
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
Red

37. In radioactive decay the atomic number (A) and mass number (Z) must what?
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect
Yes - if the particle's trail is equidistant between two adjacent anodes
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles
They must balance

38. What kind of metals react violently with water?
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
Alkali metals = first column
In the presence of a base
F = GMm/r^2

39. When is a body in translational equilibrium?
Its intensity in the spectrum
When all the external forces = zero
The element's mass number
The particle's charge and the magnitude of the electric field

40. What is a metathesis rxn?
Colligative: it depends on the number of solute molecules in a given volume of water
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/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
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles

41. What is the hybridization of oxygen in water and other oxygens similar to water with two bonds and two lone pairs of electrons?
Sp^3
F = GMm/r^2
Zero
400 to 700 nm

42. Why is it important that the materials used as scintillators are nearly transparent to the wavelength of light they emit?
It's weight = mg; the work would be the weight times the distance fell
Faraday/electrons
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
+/- 1/2

43. Charged particles in motion constitute what? Freely moving charges are deflected by what? The curved path depends on what?
It's weight = mg; h
Force times the distance over which the force acts
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
A positron or electron; when atomic number goes up you know an electron has been emitted

44. How do you find the equiv capacitance of capacitors in series and parallel? What about if you are trying to find equivalent resistance?
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
Mass number stays the same but the atomic number increases
It's weight = mg; the work would be the weight times the distance fell

45. The coefficient of kinetic friction is always lower than what? Therefore what?
Density (gravitational constant) height
That of static friction; there is a net accelerating force on the block once it starts to slide
The mass number stays the number but the atomic number decreases by one - usually resulting in another element
Ease of polarizability of the molecule and thus increasing molecular weight of mass

46. If asked which electron configuration of an element is most stable which one do you choose?
The regular one
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c
Half of the exponent
How strong a base is

47. Young's modulus is a ________ for a material. What is it's ratio? What would a graph of it look like?
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)
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant
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
Decreasing potential energy

48. If you have longer wavelengths how is their freq and energy compared to shorter wavelengths?
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
B = pVg; density
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous
When HIn is turned into In- - which is dependent upon the pKa of the indicator

49. What kind of geometry is octahedral?
When you have central atom with six ions on it
The force along the board to the normal force
It can also equal 'mg'; the compressive strength of a substance
Negative

50. What is Newton's Universal Law of Gravitation?
F = GMm/r^2
Ability to locate an event in space
+/- 1/2
Cathode; anode