DSST Physical Sciences2

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. if lead is successively preciptated as PbSO4 - PbI - and PbCO2 - which is less soluble than which? Thus which anions will be precipitated first?
Energy
Gravity
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
The reaction between the base and water


2. When a falling mass is at terminal speed - what is the power expended by the air resistance?
Electrons from anode and battery
P = F(v) = mg(v -terminal)
3+
-l to +l


3. What happens if an atom undergoes positron decay or electron capture?
7 always!!!
An odd number
Vertically; perpendicular to all surfaces
The mass number stays the number but the atomic number decreases by one - usually resulting in another element


4. What are the units of an electric field?
V/m or N/C
When you have central atom with six ions on it
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
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R


5. 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
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
It's weight = mg; h
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


6. What would the force be of a block on a pulley? What would be its displacement?

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7. What is Avagadro's number regarding ions/mol?
The current is the same
6.02 x 10^23 ions/mol
E = (kq)/r^2
Accelerated by a higher voltage between the cathode and anode


8. 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?
It has a positive oxidation potential so it is easily oxidized
7 always!!!
One mole of electric charge
It experiences a constant electric force of qE and will thus accelerate towards the positive plate


9. Mechanical waves in a medium fxn to transport what?
Zero
Energy
Colligative; the number of solute particles present
From peak to peak


10. Charged particles in motion constitute what? Freely moving charges are deflected by what? The curved path depends on what?
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
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
Cathode; anode
Pascal (N*m^2)


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

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12. How do you find moles of a substance when you are given faradays and electrons?
Positive
It can absorb light that lets other electrons fill those orbitals
Faraday/electrons
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


13. The probability of an X-ray emission event at a given wavelength is measured by what?
The particle's charge and the magnitude of the electric field
The path is longer on the inclined plane so it will take object longer to reach the bottom
Its intensity in the spectrum
It can absorb light that lets other electrons fill those orbitals


14. Always remember that velocity has ____ and ____
0 Hz because they are traveling side by side at the same speed
Mag and direction
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
[A]^a[B]^b


15. What is the magnetic quantum number?
Voltage
-l to +l
The path is longer on the inclined plane so it will take object longer to reach the bottom
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure


16. The number of incident photons on the cathode affect what?
Red
Add them together
1000
The number of electrons emitted


17. For a given flow rate - the speed of fluid flow is inversely proportional to what?
The cross-sectional area through which the fluid flows
Electron shell number
Faraday/electrons
When electron falls from high energy to low energy level


18. The concentration of OH and H30 ions are approximately equal at what pH?
H has a small atomic radius
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
The current is the same
7 always!!!


19. Pressure in a liquid is proportional to what? So why does this explain why blood pressure is greater in legs?
Cathode; anode
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
P = IV
Isolating an atom from minerals by decomposing the minerals with an electric current


20. What energy conversion describes best what takes place in a battery-powered resistive circuit?
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
The lowest whole number ratio of moles of each element in a mole of a cmpd
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors


21. What does specific heat of a substance tell you? Thus what does a higher specific heat tell you?
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
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
Its twice that distance
Positron emission


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 alpha particle can also be assumed to be what element? What is the mass number of Helium?
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect
7 always!!!
Helium; 4
Cathode; anode


24. What is the amt of energy that a frictional force generates?
Colligative; the number of solute particles present
Liquid displaced by that object
The density of the water and volume of the lead object
Force times the distance over which the force acts


25. How many mL is in one liter?
1000
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
Ability to locate an event in space


26. When is a body in translational equilibrium?
Voltage
Only temperature of the water bath
When all the external forces = zero
It's weight = mg; the work would be the weight times the distance fell


27. Considering the answer in the last slide - what kind of a solution would have a lower freezing pt?
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
Red
At an equal distance behind it as the object is in front of the mirror
One that has more solute particles per liter of solution


28. Friction is caused by what?
Attractive molecular forces acting between material surfaces in contact
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
Colligative; the number of solute particles present
A salt and water


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


30. How do you find length of time something is in flight? How do you find distance it traveled?
Cathode; anode
The volume of the ice cube or whatever it is
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
T = (2h/g)^1/2; distance = vt


31. A saturated solution of KNO3 means what? If you add salt that has any of these two ions what will happen? What is this called?
They increase because you hear a lower frequency
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant
Accelerated by a higher voltage between the cathode and anode


32. What is sublimation?
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
Only temperature of the water bath
One mole of electric charge
Going from solid to gas phase


33. A floating ice cube implies that it's weight is balanced by what?
One mole of electric charge
Yes - if the particle's trail is equidistant between two adjacent anodes
The buoyant force on it; W = mg = pVg
It decreases; the work done by the gas in expanding decreases its internal energy


34. Beta decay is the same as what?
180 degrees; when there is half a wave distance in phase between two waves
Positron emission
The number of electrons emitted
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


35. What is usually conserved over oscillation periods?
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
Its twice that distance
Energy
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water


36. If both weight and bouyant force are dependent on g - that makes g independent of what?
The volume of the ice cube or whatever it is
It's weight = mg; the work would be the weight times the distance fell
[A]^a[B]^b
A positron or electron; when atomic number goes up you know an electron has been emitted


37. When the source of a sound is flying away from you what happens to the wavelengths from peak to peak?
Total internal reflection
Sp^3
400 to 700 nm
They increase because you hear a lower frequency


38. The electrons emitted from cathode are replaced with what?
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
A constant force on a mass causes it to have a constant acceleration
Electrons from anode and battery
Energy


39. How do you figure out the literature Ksp value of a compound?
7 always!!!
A saturated solution in which the aqueous ions are in equilibrium with the solid
[A]^a[B]^b
From peak to peak


40. 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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41. What is the net result on a nucleus when you absorb a deuturon and emit a neutron?
They must balance
Negative
The nucleus gains a proton and no neutrons
When you have central atom with six ions on it


42. In general what is formed by an acid-base rxn?
P = F(v) = mg(v -terminal)
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
0 Hz because they are traveling side by side at the same speed
A salt and water


43. Acetic acid is a ______ solvent
Isolating an atom from minerals by decomposing the minerals with an electric current
At an equal distance behind it as the object is in front of the mirror
Polar
Zero


44. What happens to a negatively charged particle put between two parallel plates?
It experiences a constant electric force of qE and will thus accelerate towards the positive plate
It's weight = mg; h
The nucleus gains a proton and no neutrons
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles


45. Nuclear masses can be approximated from what?

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46. 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?
The density of the water and volume of the lead object
Attractive molecular forces acting between material surfaces in contact
A positron or electron; when atomic number goes up you know an electron has been emitted
Electron shell number


47. Is the work done by air resistance - positive or negative?
Constant to overcome the heat of fusion (solid to liquid state)
1) Young's Modulus 2) Shear Modulus 3) Bulk Modulus
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous
Negative


48. Does the temperature of a water bath or amount of water in a water bath determines if a substance melts?
The density of the water and volume of the lead object
Electrons from anode and battery
It experiences a constant electric force of qE and will thus accelerate towards the positive plate
Only temperature of the water bath


49. What color is above 656 nm?
An odd number
Red
The reaction between the base and water
Positron emission


50. 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?
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
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure
Mass number stays the same but the atomic number increases
Red