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. What is one faraday equal to?
One mole of electric charge
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 should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
The element's mass number


2. Neither N2 or O2 have a permanent what? What does this mean?
An odd number
Energy
Attractive molecular forces acting between material surfaces in contact
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces


3. In a rxn - how do you figure out which atom has the highest electron affinity?
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting
Pascal (N*m^2)
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
[A]^a[B]^b


4. Strength of dispersion force increases with what?
Ease of polarizability of the molecule and thus increasing molecular weight of mass
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
They must balance
Constant to overcome the heat of fusion (solid to liquid state)


5. What happens to the atomic number and atomic mass of an element that go under Beta decay or positron emission?
The reaction between the base and water
The current is the same
At an equal distance behind it as the object is in front of the mirror
Mass number stays the same but the atomic number increases


6. Regarding M(OH)2 and you have solubility (S) - what would the Ksp be?
Yes - if the particle's trail is equidistant between two adjacent anodes
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
How strong a base is
[S][2S]^2 = 4S^3


7. How do you find what is the limiting reagent? You can then use the moles of the limiting reagent to calculate 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
Negative
1000
Electron shell number


8. How do you find specific gravity of an object?
NO; reduction-oxidation
You look at what is being oxidized and reduced in the problem
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
Ability to locate an event in space


9. Does the temperature of a water bath or amount of water in a water bath determines if a substance melts?
Only temperature of the water bath
A saturated solution in which the aqueous ions are in equilibrium with the solid
Positron because this is known as positron decay/electron capture
Going from solid to gas phase


10. What is the angular momentum quantum number (l)? It is the same as what? What does an S orbital appear to look like? What would it's (l) 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
Strong acid and strong base/ weak acid and weak base
Energy
The particle's charge and the magnitude of the electric field


11. The closer the spacing of the anode wire - the better one can specify what?
Where an event took place
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
F =ma and F= qE


12. Melting occurs at what type of temperature? Why?
Force times the distance over which the force acts
Constant to overcome the heat of fusion (solid to liquid state)
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
Density (gravitational constant) height


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
The force along the board to the normal force
Positron emission
H = negative and S = positive


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

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16. Why are bonds between H and another atom shorter compared to most?
H has a small atomic radius
A salt and water
Positron emission
T = (2h/g)^1/2; distance = vt


17. When does red litmus paper turn blue?
Positron emission
From peak to peak
In the presence of a base
When HIn is turned into In- - which is dependent upon the pKa of the indicator


18. 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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19. What energy conversion describes best what takes place in a battery-powered resistive circuit?
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant
When you have central atom with six ions on it
When HIn is turned into In- - which is dependent upon the pKa of the indicator


20. The visible spectrum ranges from ____ to _____
1000
400 to 700 nm
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect
Zero


21. Considering the answer in the last slide - what kind of a solution would have a lower freezing pt?
[S][2S]^2 = 4S^3
One that has more solute particles per liter of solution
[A]^a[B]^b
Cathode; anode


22. What are the units of an electric field?
V/m or N/C
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
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
Mag and direction


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

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24. What is the magnitude of the electric field produced by a point charge?
E = (kq)/r^2
It experiences a constant electric force of qE and will thus accelerate towards the positive plate
In the presence of a base
Light is absorbed and re-emitted by the atomic structure of the optically dense medium


25. Young's modulus is a ________ for a material. What is it's ratio? What would a graph of it look like?
Decreasing potential energy
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R


26. What direction do gravity and bouyancy work? What direction does water pressure work?
External components of the circuit
Vertically; perpendicular to all surfaces
Electron shell number
Its intensity in the spectrum


27. The concentration of OH and H30 ions are approximately equal at what pH?
6.02 x 10^23 ions/mol
7 always!!!
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect
Ease of polarizability of the molecule and thus increasing molecular weight of mass


28. Kb is the equilibrium constant for what?
They are directly proportional
The reaction between the base and water
They increase because you hear a lower frequency
Colligative: it depends on the number of solute molecules in a given volume of water


29. Half-sine wave shape is what kind of wavelength with regards to length?
The cross-sectional area through which the fluid flows
V/m or N/C
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water
L = wavelength/2 so L= (wavelength)(2)


30. What is the law of conservation of linear momentum?
Mv = mv
Gravity
The path is longer on the inclined plane so it will take object longer to reach the bottom
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


31. How should the period of a waveform be calculated?
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
At an equal distance behind it as the object is in front of the mirror
From peak to peak
That of static friction; there is a net accelerating force on the block once it starts to slide


32. The electrons emitted from cathode are replaced with what?
Helium; 4
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure
Total internal reflection
Electrons from anode and battery


33. What is the formula for the power supplied by a battery to accelerate an electron beam?
P = IV
From peak to peak
7 always!!!
The buoyant force on it; W = mg = pVg


34. 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?
External components of the circuit
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect
Red
Sp^3


35. Mechanical waves in a medium fxn to transport what?
Its intensity in the spectrum
From peak to peak
Energy
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous


36. When an element decreases its atomic number by one what is emitted?
V/m or N/C
The element's mass number
Ability to locate an event in space
Positron because this is known as positron decay/electron capture


37. 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 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
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
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)


38. What is the equation for work done?
W = F(displacement)
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles
Momentum
Zero


39. The volume of an object is equal to water?
Attractive molecular forces acting between material surfaces in contact
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
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
Liquid displaced by that object


40. 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?
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
NO; reduction-oxidation
Its momentum is zero because velocity is zero; zero because of conservation of momentum
Where an event took place


41. What is weight equal to?
The lowest one
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
Mg
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


42. 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?
[A]^a[B]^b
The cross-sectional area through which the fluid flows
Positive
The density of the water and volume of the lead object


43. How do you find wavelength if you known distance from adjacent crests and troughs?
Its twice that distance
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
1000
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c


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
NO; reduction-oxidation
Colligative: it depends on the number of solute molecules in a given volume of water
A positron or electron; when atomic number goes up you know an electron has been emitted


45. What happens to a negatively charged particle put between two parallel plates?
It will increase as well because they are directly related - only if pressure is kept constant
The nucleus gains a proton and no neutrons
It experiences a constant electric force of qE and will thus accelerate towards the positive plate
6.02 x 10^23 ions/mol


46. What is Newton's Universal Law of Gravitation?
That it is negative
You look at what is being oxidized and reduced in the problem
F = GMm/r^2
A saturated solution in which the aqueous ions are in equilibrium with the solid


47. Nuclear masses can be approximated from what?

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48. The freezing point of an aqueous solution is what kind of property? What does this mean?
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
It will be reduced the voltage produced by the resistor which means IR; E- IR
Colligative: it depends on the number of solute molecules in a given volume of water
Add them together


49. 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?
The current is the same
It has a positive oxidation potential so it is easily oxidized
Polar
-l to +l


50. 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?
(density[p])(volume)
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
Add them together
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