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. In a rxn - how do you figure out which atom 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
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
L = wavelength/2 so L= (wavelength)(2)


2. Does the temperature of a water bath or amount of water in a water bath determines if a substance melts?
H = negative and S = positive
Only temperature of the water bath
It's weight = mg; h
F =ma and F= qE


3. 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
T = (2h/g)^1/2; distance = vt
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
One that has more solute particles per liter of solution


4. The total pressure of a solution is what? Give example.
7 always!!!
One mole of electric charge
V/m or N/C
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


5. The coefficient of static friction is the ratio of what?
The force along the board to the normal force
+/- 1/2
Positron because this is known as positron decay/electron capture
The lowest one


6. What is the relationship between P and n in PV=nRT?
Momentum
They are directly proportional
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
Red


7. 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?
The buoyant force on it; W = mg = pVg
It experiences a constant electric force of qE and will thus accelerate towards the positive plate
0 Hz because they are traveling side by side at the same speed
Electron shell number


8. How do you find specific gravity of an object?
When electron falls from high energy to low energy level
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
-l to +l
The cross-sectional area through which the fluid flows


9. Strength of dispersion force increases with what?
External components of the circuit
Negative
Ease of polarizability of the molecule and thus increasing molecular weight of mass
3+


10. Thus is Zn (which has positive oxidation potential) reacts with HCl - will any rxn take place?
You look at what is being oxidized and reduced in the problem
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
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
0 Hz because they are traveling side by side at the same speed


11. Nuclear masses can be approximated from what?

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12. When the source of a sound is flying away from you what happens to the wavelengths from peak to peak?
Only temperature of the water bath
The mass number stays the number but the atomic number decreases by one - usually resulting in another element
They increase because you hear a lower frequency
Colligative: it depends on the number of solute molecules in a given volume of water


13. 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?
Its intensity in the spectrum
+/- 1/2
Sp^3
It has a positive oxidation potential so it is easily oxidized


14. If you are given density and volume how do you find 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
Going from solid to gas phase
(density[p])(volume)
Add them together


15. How would you find rate of rxn from pH 1 to pH2?
Cathode; anode
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
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect
A saturated solution in which the aqueous ions are in equilibrium with the solid


16. If something is very toxic to a human - what Ksp value should it have for it to be the safest?
Positron emission
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
The lowest one
-l to +l


17. The electrons emitted from cathode are replaced with what?
Electrons from anode and battery
It will be reduced the voltage produced by the resistor which means IR; E- IR
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
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed


18. Melting occurs at what type of temperature? Why?
It's weight = mg; the work would be the weight times the distance fell
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting
Sp^3
Constant to overcome the heat of fusion (solid to liquid state)


19. How do you find the equiv capacitance of capacitors in series and parallel? What about if you are trying to find equivalent resistance?
Ability to locate an event in space
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
They must balance


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

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21. When a falling mass is at terminal speed - what is the power expended by the air resistance?
They are directly proportional
P = F(v) = mg(v -terminal)
When all the external forces = zero
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water


22. What is conserved in an inellastic collision?
Going from solid to gas phase
Negative
Momentum
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous


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

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24. 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
The reaction between the base and water
Its intensity in the spectrum
They increase because you hear a lower frequency


25. The boiling point of a solution is what type of property? Which means is depends only on what?
L = wavelength/2 so L= (wavelength)(2)
The density of the water and volume of the lead object
Colligative; the number of solute particles present
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


26. What happens to the atomic number and atomic mass of an element that go under Beta decay or positron emission?
Positive
Mass number stays the same but the atomic number increases
Mv = mv
It will be reduced the voltage produced by the resistor which means IR; E- IR


27. When looking at which combo of acids and bases will result in a solution with pH of 7 what do we look for?
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure
Decreasing potential energy
Isolating an atom from minerals by decomposing the minerals with an electric current
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14


28. 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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29. In Bohr model of atom when is energy emitted?
Gravity
When electron falls from high energy to low energy level
T = 2pi/angular velocity; v/r
7 always!!!


30. Neither N2 or O2 have a permanent what? What does this mean?
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
At an equal distance behind it as the object is in front of the mirror
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces
6.02 x 10^23 ions/mol


31. Acetic acid is a ______ solvent
Mg
In the presence of a base
When you have central atom with six ions on it
Polar


32. Why does light travel slower in an optically dense medium than through a vacuum?
Decreasing potential energy
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
The number of electrons emitted


33. If you are told to find the maximum number of NiCo3 that can form how do you do that?

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34. Can a catalyst shift equilibrium?
No - it increases the speed at which the rxn reaches that equilibrium
External components of the circuit
6.02 x 10^23 ions/mol
V/m or N/C


35. 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?
Alkali metals = first column
That it is negative
180 degrees; when there is half a wave distance in phase between two waves
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. If temperature arises during a mixture what can you conclude about the enthalpy?
Liquid displaced by that object
It decreases; the work done by the gas in expanding decreases its internal energy
That it is negative
One that has more solute particles per liter of solution


37. What color is above 656 nm?
(density[p])(volume)
0 Hz because they are traveling side by side at the same speed
Red
The buoyant force on it; W = mg = pVg


38. What is the equation for pressure?
Only temperature of the water bath
An odd number
Density (gravitational constant) height
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


39. What kind of geometry is octahedral?
When you have central atom with six ions on it
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting
Cathode; anode
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous


40. What energy conversion describes best what takes place in a battery-powered resistive circuit?
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
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
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
Constant to overcome the heat of fusion (solid to liquid state)


41. The volume of an object is equal to water?
Liquid displaced by that object
Positron because this is known as positron decay/electron capture
They increase because you hear a lower frequency
The density of the water and volume of the lead object


42. What is the equation for a period (T)? What is the equation for angular velocity?
E = (kq)/r^2
Ability to locate an event in space
7 always!!!
T = 2pi/angular velocity; v/r


43. The Ksp for a substance of AaBb is what?
When electron falls from high energy to low energy level
Its intensity in the spectrum
Red
[A]^a[B]^b


44. What is a metathesis rxn?
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
Shorter than it should be so rays from a distant object form in front of retina; use divergent lens
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2


45. If you are given a table of substances and are told to find which two show effect of molecular weight on melting point alone - which two substances should you look for?
(+)
T = 2pi/angular velocity; v/r
Mv = mv
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)


46. How do you find moles of a substance when you are given faradays and electrons?
Faraday/electrons
Total internal reflection
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
It decreases; the work done by the gas in expanding decreases its internal energy


47. What is the equation for bouyant force? What is p?
They must balance
They do not differ
The nucleus gains a proton and no neutrons
B = pVg; density


48. What is weight equal to?
Mg
Energy
F =ma and F= qE
Accelerated by a higher voltage between the cathode and anode


49. If both weight and bouyant force are dependent on g - that makes g independent of what?
[A]^a[B]^b
The volume of the ice cube or whatever it is
-l to +l
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14


50. What is the equation for work done?
Mg
When electron falls from high energy to low energy level
P = IV
W = F(displacement)