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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. Why is it important that the materials used as scintillators are nearly transparent to the wavelength of light they emit?
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
When HIn is turned into In- - which is dependent upon the pKa of the indicator
It's weight = mg; h
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

2. Why would a solution with unfilled orbitals be responsible for turning a solution a certian color?
Gravity
It can absorb light that lets other electrons fill those orbitals
Electrons from anode and battery
Vertically; perpendicular to all surfaces

3. Why does light travel slower in an optically dense medium than through a vacuum?
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
Electrons from anode and battery
Energy
Light is absorbed and re-emitted by the atomic structure of the optically dense medium

4. The probability of an X-ray emission event at a given wavelength is measured by what?
Its intensity in the spectrum
They do not differ
No - it increases the speed at which the rxn reaches that equilibrium
That it is negative

5. A cmpd with the lowest carbon to oxygen ratio will require how much oxygen for combustion?
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio
They must balance
Energy
Electrons from anode and battery

6. The equivalence pt is what part of the titration curve? Thus looking at the range of change between the pH values along this part of the graph can tell you what?

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7. 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?
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
Half of the exponent
It's weight = mg; h
The density of the water and volume of the lead object

8. What happens to the atomic number and atomic mass of an element that go under Beta decay or positron emission?
Positive
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
Mass number stays the same but the atomic number increases
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14

9. How do you find the equiv capacitance of capacitors in series and parallel? What about if you are trying to find equivalent resistance?
Mag and direction
Colligative; the number of solute particles present
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
Ability to locate an event in space

10. 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
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
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
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed

11. The Ksp for a substance of AaBb is what?
Its twice that distance
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant
Positive
[A]^a[B]^b

12. Hydrogen has what kind of standard oxidation or reduction potential?
Zero
Its momentum is zero because velocity is zero; zero because of conservation of momentum
Where an event took place
It will be reduced the voltage produced by the resistor which means IR; E- IR

13. If you have longer wavelengths how is their freq and energy compared to shorter wavelengths?
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous
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
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
-l to +l

14. Light can be carried along a distance within a transparent material by means of what?
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
Total internal reflection
It experiences a constant electric force of qE and will thus accelerate towards the positive plate
The particle's charge and the magnitude of the electric field

15. Strength of dispersion force increases with what?
The force along the board to the normal force
Zero
Ease of polarizability of the molecule and thus increasing molecular weight of mass
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

16. When the source of a sound is flying away from you what happens to the wavelengths from peak to peak?
Cathode; anode
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
Strong acid and strong base/ weak acid and weak base
They increase because you hear a lower frequency

17. What does the empirical formula show?
The path is longer on the inclined plane so it will take object longer to reach the bottom
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
They do not differ
The lowest whole number ratio of moles of each element in a mole of a cmpd

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

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19. If both weight and bouyant force are dependent on g - that makes g independent of what?
The density of the water and volume of the lead object
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
The volume of the ice cube or whatever it is
It will increase as well because they are directly related - only if pressure is kept constant

20. What direction do gravity and bouyancy work? What direction does water pressure work?
Half of the exponent
Vertically; perpendicular to all surfaces
They increase because you hear a lower frequency
P = IV

21. Acetic acid is a ______ solvent
No - it increases the speed at which the rxn reaches that equilibrium
Helium; 4
Polar
The lowest whole number ratio of moles of each element in a mole of a cmpd

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

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23. An oxidation-reduction rxn that occurs spontaneously has what kind of E^o for the cell?
No - it increases the speed at which the rxn reaches that equilibrium
(+)
Positive
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

24. The number of incident photons on the cathode affect what?
The number of electrons emitted
Colligative; the number of solute particles present
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting
Vertically; perpendicular to all surfaces

25. 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?
It will be reduced the voltage produced by the resistor which means IR; E- IR
-l to +l
E = (kq)/r^2
1000

26. The boiling point of a solution is what type of property? Which means is depends only on what?
180 degrees; when there is half a wave distance in phase between two waves
Colligative; the number of solute particles present
It's weight = mg; h
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)

27. When an element decreases its atomic number by one what is emitted?
[A]^a[B]^b
Positron because this is known as positron decay/electron capture
E = (kq)/r^2
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure

28. What kind of metals react violently with water?
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
External components of the circuit
E = (kq)/r^2
Alkali metals = first column

29. When you are trying to calculate a galvanic cell's emf - what do you look at?
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
Only temperature of the water bath
When electron falls from high energy to low energy level
You look at what is being oxidized and reduced in the problem

30. How do you balance redox rxns?

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31. What is the equation for a period (T)? What is the equation for angular velocity?
A positron or electron; when atomic number goes up you know an electron has been emitted
T = 2pi/angular velocity; v/r
From peak to peak
Vertically; perpendicular to all surfaces

32. What kind of geometry is octahedral?
When you have central atom with six ions on it
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
Voltage
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

33. 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?
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)
The particle's charge and the magnitude of the electric field
Add them together
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2

34. The coefficient of kinetic friction is always lower than what? Therefore what?
It will increase as well because they are directly related - only if pressure is kept constant
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
That of static friction; there is a net accelerating force on the block once it starts to slide
T = (2h/g)^1/2; distance = vt

35. How do you find length of time something is in flight? How do you find distance it traveled?
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles
H = negative and S = positive
T = (2h/g)^1/2; distance = vt
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

36. An alpha particle can also be assumed to be what element? What is the mass number of Helium?
Ability to locate an event in space
Helium; 4
Total internal reflection
Isolating an atom from minerals by decomposing the minerals with an electric current

37. 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?
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
One that has more solute particles per liter of solution
They must balance
0 Hz because they are traveling side by side at the same speed

38. Considering the answer in the last slide - what kind of a solution would have a lower freezing pt?
The path is longer on the inclined plane so it will take object longer to reach the bottom
The current is the same
How strong a base is
One that has more solute particles per liter of solution

39. What does specific heat of a substance tell you? Thus what does a higher specific heat tell you?
P = F(v) = mg(v -terminal)
Ease of polarizability of the molecule and thus increasing molecular weight of mass
In the presence of a base
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

40. What is the relationship between P and n in PV=nRT?
Going from solid to gas phase
Only temperature of the water bath
They are directly proportional
When all the external forces = zero

41. What is conserved in an inellastic collision?
Ease of polarizability of the molecule and thus increasing molecular weight of mass
E = (kq)/r^2
Where an event took place
Momentum

42. What is the net result on a nucleus when you absorb a deuturon and emit a neutron?
The nucleus gains a proton and no neutrons
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
That they are catalysts in the rxn because they react with the substrate and are reformed
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles

43. Can a catalyst shift equilibrium?
No - it increases the speed at which the rxn reaches that equilibrium
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
(density[p])(volume)
Colligative: it depends on the number of solute molecules in a given volume of water

44. What is newton's second law?
When HIn is turned into In- - which is dependent upon the pKa of the indicator
They are directly proportional
A constant force on a mass causes it to have a constant acceleration
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces

45. What is the unit for Young's Modulus?
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
Mv = mv
Pascal (N*m^2)
Energy

46. For a given flow rate - the speed of fluid flow is inversely proportional to what?
The lowest one
The cross-sectional area through which the fluid flows
Its twice that distance
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

47. What energy conversion describes best what takes place in a battery-powered resistive circuit?
T = (2h/g)^1/2; distance = vt
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
Decreasing potential energy
Light is absorbed and re-emitted by the atomic structure of the optically dense medium

48. 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?
From peak to peak
3+
It has a positive oxidation potential so it is easily oxidized
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)

49. The electrons emitted from cathode are replaced with what?
Only temperature of the water bath
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
Electrons from anode and battery
P = IV

50. When a falling mass is at terminal speed - what is the power expended by the air resistance?
400 to 700 nm
-l to +l
P = F(v) = mg(v -terminal)
The reaction between the base and water