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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. A pendulum moves under the influence of what?
W = F(displacement)
6.02 x 10^23 ions/mol
Gravity
Strong acid and strong base/ weak acid and weak base

2. What is the formula for the power supplied by a battery to accelerate an electron beam?
0 Hz because they are traveling side by side at the same speed
They do not differ
P = IV
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure

3. The visible spectrum ranges from ____ to _____
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c
Mag and direction
400 to 700 nm
The buoyant force on it; W = mg = pVg

4. Melting occurs at what type of temperature? Why?
Energy
A constant force on a mass causes it to have a constant acceleration
Constant to overcome the heat of fusion (solid to liquid state)
3+

5. What is newton's second law?
Only temperature of the water bath
A constant force on a mass causes it to have a constant acceleration
An odd number
They increase because you hear a lower frequency

6. Regarding M(OH)2 and you have solubility (S) - what would the Ksp be?
From peak to peak
[S][2S]^2 = 4S^3
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)
A salt and water

7. How do the final velocities differ if a sphere is dropped from a distance rather than rolled down an inclined plane?
+/- 1/2
They do not differ
Liquid displaced by that object
Alkali metals = first column

8. 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?
Negative
(+)
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)
It will be reduced the voltage produced by the resistor which means IR; E- IR

9. How do you find 'g' from Newton's law of gravity?
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
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
When all the external forces = zero
It's weight = mg; h

10. What kind of charge is on Al?
+/- 1/2
Attractive molecular forces acting between material surfaces in contact
3+
It's weight = mg; h

11. Young's modulus is a ________ for a material. What is it's ratio? What would a graph of it look like?
P = F(v) = mg(v -terminal)
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant
Energy
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting

12. 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?
The cross-sectional area through which the fluid flows
Mv = mv
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
Momentum

13. What is one faraday equal to?
Ability to locate an event in space
Positron emission
Neutrons; atomic number
One mole of electric charge

14. When the source of a sound is flying away from you what happens to the wavelengths from peak to peak?
Yes - if the particle's trail is equidistant between two adjacent anodes
One mole of electric charge
Helium; 4
They increase because you hear a lower frequency

15. The probability of an X-ray emission event at a given wavelength is measured by what?
Ease of polarizability of the molecule and thus increasing molecular weight of mass
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
Its intensity in the spectrum
That they are catalysts in the rxn because they react with the substrate and are reformed

16. Strength of dispersion force increases with what?
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
The cross-sectional area through which the fluid flows
Ease of polarizability of the molecule and thus increasing molecular weight of mass
A saturated solution in which the aqueous ions are in equilibrium with the solid

17. What type of acid and base would produce a pH closest to 7?
Strong acid and strong base/ weak acid and weak base
One that has more solute particles per liter of solution
Mg
Isolating an atom from minerals by decomposing the minerals with an electric current

18. What happens to the atomic number and atomic mass of an element that go under Beta decay or positron emission?
B = pVg; density
Mass number stays the same but the atomic number increases
It can absorb light that lets other electrons fill those orbitals
(density[p])(volume)

19. What is the equation for work done?
The mass number stays the number but the atomic number decreases by one - usually resulting in another element
Mag and direction
That it is negative
W = F(displacement)

20. How do you find specific gravity of an object?
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces
Polar
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 electron falls from high energy to low energy level

21. The electrons emitted from cathode are replaced with what?
The number of electrons emitted
One mole of electric charge
Electrons from anode and battery
In the presence of a base

22. How do you find the equiv capacitance of capacitors in series and parallel? What about if you are trying to find equivalent resistance?
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
1000
Electrons from anode and battery
A constant force on a mass causes it to have a constant acceleration

23. Charged particles in motion constitute what? Freely moving charges are deflected by what? The curved path depends on what?
Sp^3
That it is negative
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
1000

24. Heat from friction comes from what?
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
Decreasing potential energy
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect
6.02 x 10^23 ions/mol

25. In a galvanic and electrolytic cell - reduction of an ion occurs where? Oxidation of an ion occurs where?
Cathode; anode
Pascal (N*m^2)
They increase because you hear a lower frequency
H = negative and S = positive

26. Why are bonds between H and another atom shorter compared to most?
Its intensity in the spectrum
H has a small atomic radius
Mass number stays the same but the atomic number increases
You look at what is being oxidized and reduced in the problem

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

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28. If any species is gotten rid of when combining two equations of chemical rxns together what can you conclude about those species?
Electrons from anode and battery
That they are catalysts in the rxn because they react with the substrate and are reformed
P = IV
It's weight = mg; h

29. An oxidation-reduction rxn that occurs spontaneously has what kind of E^o for the cell?
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
The volume of the ice cube or whatever it is
Positive
It's weight = mg; the work would be the weight times the distance fell

30. What happens if an atom undergoes positron decay or electron capture?
When electron falls from high energy to low energy level
(+)
The mass number stays the number but the atomic number decreases by one - usually resulting in another element
A positron or electron; when atomic number goes up you know an electron has been emitted

31. If temperature arises during a mixture what can you conclude about the enthalpy?
The element's mass number
Accelerated by a higher voltage between the cathode and anode
That it is negative
Negative

32. The freezing point of an aqueous solution is what kind of property? What does this mean?
H has a small atomic radius
Colligative: it depends on the number of solute molecules in a given volume of water
-l to +l
It's weight = mg; the work would be the weight times the distance fell

33. How would you find rate of rxn from pH 1 to pH2?
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
How strong a base is
Add them together
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

34. Why does light travel slower in an optically dense medium than through a vacuum?
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
Only temperature of the water bath
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water
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

35. Beta decay is the same as what?
Positron emission
+/- 1/2
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
The regular one

36. The temperature of a metal will not increase above its melting point until what?
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting
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
Momentum
Half of the exponent

37. The free energy change (G) must be negative when what?
Ability to locate an event in space
Total internal reflection
T = 2pi/angular velocity; v/r
H = negative and S = positive

38. If both weight and bouyant force are dependent on g - that makes g independent of what?
The buoyant force on it; W = mg = pVg
A positron or electron; when atomic number goes up you know an electron has been emitted
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 volume of the ice cube or whatever it is

39. When an element decreases its atomic number by one what is emitted?
Positron because this is known as positron decay/electron capture
The particle's charge and the magnitude of the electric field
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water
The regular one

40. What is the law of conservation of linear momentum?
Cathode; anode
Mv = mv
Mass number stays the same but the atomic number increases
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2

41. 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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42. The volume of an object is equal to water?
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
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous
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
Liquid displaced by that object

43. In Bohr model of atom when is energy emitted?
Cathode; anode
V/m or N/C
A constant force on a mass causes it to have a constant acceleration
When electron falls from high energy to low energy level

44. The coefficient of static friction is the ratio of what?
The force along the board to the normal force
The current is the same
Zero
One that has more solute particles per liter of solution

45. As a balloon rises in a tank of water what happens to the temperature inside it? Why would this happen?
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
It decreases; the work done by the gas in expanding decreases its internal energy
Colligative: it depends on the number of solute molecules in a given volume of water
Pascal (N*m^2)

46. In order to increase the kinetic energy of electrons - they must be what?
Accelerated by a higher voltage between the cathode and anode
Energy
H has a small atomic radius
Positron because this is known as positron decay/electron capture

47. Considering the answer in the last slide - what kind of a solution would have a lower freezing pt?
Mass number stays the same but the atomic number increases
A constant force on a mass causes it to have a constant acceleration
Faraday/electrons
One that has more solute particles per liter of solution

48. Is the work done by air resistance - positive or negative?
Negative
Red
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
-l to +l

49. if lead is successively preciptated as PbSO4 - PbI - and PbCO2 - which is less soluble than which? Thus which anions will be precipitated first?
Constant to overcome the heat of fusion (solid to liquid state)
P = F(v) = mg(v -terminal)
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
6.02 x 10^23 ions/mol

50. How do you find moles of a substance when you are given faradays and electrons?
At an equal distance behind it as the object is in front of the mirror
Faraday/electrons
They are directly proportional
Electrons from anode and battery