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. How do the final velocities differ if a sphere is dropped from a distance rather than rolled down an inclined plane?
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces
They do not differ
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles


2. What is one faraday equal to?
The lowest one
In the presence of a base
One mole of electric charge
Force times the distance over which the force acts


3. When is a body in translational equilibrium?
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio
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
When all the external forces = zero
Shorter than it should be so rays from a distant object form in front of retina; use divergent lens


4. Thus is Zn (which has positive oxidation potential) reacts with HCl - will any rxn take place?
Decreasing potential energy
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
They do not differ
It can also equal 'mg'; the compressive strength of a substance


5. When you are trying to calculate a galvanic cell's emf - what do you look at?
You look at what is being oxidized and reduced in the problem
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
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant


6. 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?
H has a small atomic radius
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous


7. What is the unit for Young's Modulus?
That of static friction; there is a net accelerating force on the block once it starts to slide
Pascal (N*m^2)
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure
No - it increases the speed at which the rxn reaches that equilibrium


8. What is the law of conservation of linear momentum?
Mv = mv
1000
Mag and direction
Neutrons; atomic number


9. When does red litmus paper turn blue?
When you have central atom with six ions on it
In the presence of a base
They increase because you hear a lower frequency
A positron or electron; when atomic number goes up you know an electron has been emitted


10. Neither N2 or O2 have a permanent what? What does this mean?
Helium; 4
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
P = F(v) = mg(v -terminal)
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces


11. How do you find moles of a substance when you are given faradays and electrons?
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
Faraday/electrons
6.02 x 10^23 ions/mol
Accelerated by a higher voltage between the cathode and anode


12. When looking at which combo of acids and bases will result in a solution with pH of 7 what do we look for?
They do not differ
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
Constant to overcome the heat of fusion (solid to liquid state)
Add them together


13. Equivalent mass is what?
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
One that has more solute particles per liter of solution
The current is the same
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


14. What is the amt of energy that a frictional force generates?
NO; reduction-oxidation
A constant force on a mass causes it to have a constant acceleration
You look at what is being oxidized and reduced in the problem
Force times the distance over which the force acts


15. If something is very toxic to a human - what Ksp value should it have for it to be the safest?
The reaction between the base and water
The lowest one
Ability to locate an event in space
Voltage


16. What is the magnitude of the electric field produced by a point charge?
Liquid displaced by that object
A saturated solution in which the aqueous ions are in equilibrium with the solid
E = (kq)/r^2
The cross-sectional area through which the fluid flows


17. What does the empirical formula show?
-l to +l
The nucleus gains a proton and no neutrons
The lowest whole number ratio of moles of each element in a mole of a cmpd
They do not differ


18. Why would a solution with unfilled orbitals be responsible for turning a solution a certian color?
It's weight = mg; the work would be the weight times the distance fell
How strong a base is
It can also equal 'mg'; the compressive strength of a substance
It can absorb light that lets other electrons fill those orbitals


19. Pressure in a liquid is proportional to what? So why does this explain why blood pressure is greater in legs?
(density[p])(volume)
You look at what is being oxidized and reduced in the problem
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water


20. What is different between an inclined plane and free fall?
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
Mv = mv
The path is longer on the inclined plane so it will take object longer to reach the bottom
One mole of electric charge


21. The volume of an object is equal to water?
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
Ability to locate an event in space
Momentum
Liquid displaced by that object


22. As a balloon rises in a tank of water what happens to the temperature inside it? Why would this happen?
Energy
It decreases; the work done by the gas in expanding decreases its internal energy
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
Its momentum is zero because velocity is zero; zero because of conservation of momentum


23. 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?
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
Its momentum is zero because velocity is zero; zero because of conservation of momentum
Positron emission
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2


24. What energy conversion describes best what takes place in a battery-powered resistive circuit?
The density of the water and volume of the lead object
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
Where an event took place
The particle's charge and the magnitude of the electric field


25. How do you find specific gravity of an object?
Decreasing potential energy
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
When HIn is turned into In- - which is dependent upon the pKa of the indicator
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


26. Why is it important that the materials used as scintillators are nearly transparent to the wavelength of light they emit?
NO; reduction-oxidation
The reaction between the base and 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
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c


27. The freezing point of an aqueous solution is what kind of property? What does this mean?
When electron falls from high energy to low energy level
Colligative: it depends on the number of solute molecules in a given volume of water
Only temperature of the water bath
F = GMm/r^2


28. What happens if an atom undergoes positron decay or electron capture?
The mass number stays the number but the atomic number decreases by one - usually resulting in another element
Yes - if the particle's trail is equidistant between two adjacent anodes
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
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect


29. Nuclear masses can be approximated from what?

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30. 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
W = F(displacement)
Voltage
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant


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

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32. What is the formula for the power supplied by a battery to accelerate an electron beam?
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
P = IV
Going from solid to gas phase
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water


33. Young's modulus is a ________ for a material. What is it's ratio? What would a graph of it look like?
Constant to overcome the heat of fusion (solid to liquid state)
The cross-sectional area through which the fluid flows
A constant force on a mass causes it to have a constant acceleration
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant


34. If asked which electron configuration of an element is most stable which one do you choose?
Positive
It will be reduced the voltage produced by the resistor which means IR; E- IR
The force along the board to the normal force
The regular one


35. Why are bonds between H and another atom shorter compared to most?
Mag and direction
The mass number stays the number but the atomic number decreases by one - usually resulting in another element
H has a small atomic radius
Add them together


36. What type of acid and base would produce a pH closest to 7?
Yes - if the particle's trail is equidistant between two adjacent anodes
Negative
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
Strong acid and strong base/ weak acid and weak base


37. Melting occurs at what type of temperature? Why?
Mg
Only temperature of the water bath
It will be reduced the voltage produced by the resistor which means IR; E- IR
Constant to overcome the heat of fusion (solid to liquid state)


38. What gas is evolved when copper is placed in a nitric acid (HNO3) solution? This is what type of rxn?
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles
Red
NO; reduction-oxidation


39. The closer the spacing of the anode wire - the better one can specify what?
The volume of the ice cube or whatever it is
Where an event took place
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect
Attractive molecular forces acting between material surfaces in contact


40. Can a charged particle be detected by two anodes?

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41. What do electrolytic techniques involve?
T = (2h/g)^1/2; distance = vt
When electron falls from high energy to low energy level
Isolating an atom from minerals by decomposing the minerals with an electric current
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)


42. Kb is the equilibrium constant for what?
1) Young's Modulus 2) Shear Modulus 3) Bulk Modulus
Electrons from anode and battery
The reaction between the base and water
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2


43. How do you find what is the limiting reagent? You can then use the moles of the limiting reagent to calculate what?
Electron shell number
W = F(displacement)
The number of electrons 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


44. If both weight and bouyant force are dependent on g - that makes g independent of what?
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles
V/m or N/C
The volume of the ice cube or whatever it is
Where an event took place


45. Acetic acid is a ______ solvent
Only temperature of the water bath
A constant force on a mass causes it to have a constant acceleration
Polar
The path is longer on the inclined plane so it will take object longer to reach the bottom


46. Friction is caused by what?
It experiences a constant electric force of qE and will thus accelerate towards the positive plate
The lowest whole number ratio of moles of each element in a mole of a cmpd
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
Attractive molecular forces acting between material surfaces in contact


47. How do you figure out the literature Ksp value of a compound?
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous
Mag and direction
Shorter than it should be so rays from a distant object form in front of retina; use divergent lens
A saturated solution in which the aqueous ions are in equilibrium with the solid


48. In order to increase the kinetic energy of electrons - they must be what?
One mole of electric charge
Accelerated by a higher voltage between the cathode and anode
Momentum
Red


49. 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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50. F in the Young's modulus equation can also equal what? What is E?

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