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

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2. Thus is Zn (which has positive oxidation potential) reacts with HCl - will any rxn take place?
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
It will be reduced the voltage produced by the resistor which means IR; E- IR
The element's mass number
7 always!!!


3. A plane mirror produces an image where?
400 to 700 nm
1000
External components of the circuit
At an equal distance behind it as the object is in front of the mirror


4. In order to guarantee a non-zero spin how many electrons are needed?
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
An odd number
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
V/m or N/C


5. 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?
Decreasing potential energy
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
H has a small atomic radius
It will be reduced the voltage produced by the resistor which means IR; E- IR


6. What direction do gravity and bouyancy work? What direction does water pressure work?
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
Energy
When electron falls from high energy to low energy level
Vertically; perpendicular to all surfaces


7. The phase difference corresponding to a half wave is what? When do you get destructive interference?
Constant to overcome the heat of fusion (solid to liquid state)
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio
It experiences a constant electric force of qE and will thus accelerate towards the positive plate
180 degrees; when there is half a wave distance in phase between two waves


8. What is the equation for a period (T)? What is the equation for angular velocity?
3+
One that has more solute particles per liter of solution
T = 2pi/angular velocity; v/r
When all the external forces = zero


9. Young's modulus is a ________ for a material. What is it's ratio? What would a graph of it look like?
H = negative and S = positive
Neutrons; atomic number
The nucleus gains a proton and no neutrons
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant


10. Does the temperature of a water bath or amount of water in a water bath determines if a substance melts?
One that has more solute particles per liter of solution
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous
Only temperature of the water bath
B = pVg; density


11. In radioactive decay the atomic number (A) and mass number (Z) must what?
Energy
A constant force on a mass causes it to have a constant acceleration
They must balance
An odd number


12. When looking at which combo of acids and bases will result in a solution with pH of 7 what do we look for?
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
Mag and direction
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


13. 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
They do not differ
Its momentum is zero because velocity is zero; zero because of conservation of momentum
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio


14. 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?
Cathode; anode
Positron because this is known as positron decay/electron capture
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
Positron emission


15. An alpha particle can also be assumed to be what element? What is the mass number of Helium?
6.02 x 10^23 ions/mol
Pascal (N*m^2)
Helium; 4
The nucleus gains a proton and no neutrons


16. 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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17. Is the work done by air resistance - positive or negative?
7 always!!!
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
Negative
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors


18. As a balloon rises in a tank of water what happens to the temperature inside it? Why would this happen?
That it is negative
The volume of the ice cube or whatever it is
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c
It decreases; the work done by the gas in expanding decreases its internal energy


19. Melting occurs at what type of temperature? Why?
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
Constant to overcome the heat of fusion (solid to liquid state)
L = wavelength/2 so L= (wavelength)(2)
Its momentum is zero because velocity is zero; zero because of conservation of momentum


20. The visible spectrum ranges from ____ to _____
It can also equal 'mg'; the compressive strength of a substance
The lowest whole number ratio of moles of each element in a mole of a cmpd
400 to 700 nm
[A]^a[B]^b


21. The electrons emitted from cathode are replaced with what?
Electrons from anode and battery
T = 2pi/angular velocity; v/r
Energy
When electron falls from high energy to low energy level


22. An oxidation-reduction rxn that occurs spontaneously has what kind of E^o for the cell?
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
You look at what is being oxidized and reduced in the problem
Positive
From peak to peak


23. When does red litmus paper turn blue?
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
Liquid displaced by that object
180 degrees; when there is half a wave distance in phase between two waves
In the presence of a base


24. Nuclear masses can be approximated from what?

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25. The range of pH in which a color change takes place in a titration depends on what?
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
The lowest one
Faraday/electrons
When HIn is turned into In- - which is dependent upon the pKa of the indicator


26. 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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27. Strength of dispersion force increases with what?
400 to 700 nm
The mass number stays the number but the atomic number decreases by one - usually resulting in another element
Gravity
Ease of polarizability of the molecule and thus increasing molecular weight of mass


28. Why are bonds between H and another atom shorter compared to most?
V/m or N/C
0 Hz because they are traveling side by side at the same speed
H has a small atomic radius
Shorter than it should be so rays from a distant object form in front of retina; use divergent lens


29. How do you balance redox rxns?

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30. If asked which electron configuration of an element is most stable which one do you choose?
The regular one
Electrons from anode and battery
At an equal distance behind it as the object is in front of the mirror
A saturated solution in which the aqueous ions are in equilibrium with the solid


31. Hydrogen has what kind of standard oxidation or reduction potential?
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
The cross-sectional area through which the fluid flows
Zero
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


32. What is sublimation?
Positron emission
Going from solid to gas phase
Positron because this is known as positron decay/electron capture
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)


33. What is the hybridization of oxygen in water and other oxygens similar to water with two bonds and two lone pairs of electrons?
Ease of polarizability of the molecule and thus increasing molecular weight of mass
The reaction between the base and water
Sp^3
400 to 700 nm


34. What is the doppler equation for wavelength and frequency?
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c
When you have central atom with six ions on it
That it is negative
Pascal (N*m^2)


35. What is Newton's Universal Law of Gravitation?
That of static friction; there is a net accelerating force on the block once it starts to slide
Yes - if the particle's trail is equidistant between two adjacent anodes
F = GMm/r^2
The volume of the ice cube or whatever it is


36. The temperature of a metal will not increase above its melting point until what?
1000
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting
Zero
Accelerated by a higher voltage between the cathode and anode


37. In general what is formed by an acid-base rxn?
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
Yes - if the particle's trail is equidistant between two adjacent anodes
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
A salt and water


38. How do you find the equiv capacitance of capacitors in series and parallel? What about if you are trying to find equivalent resistance?
That they are catalysts in the rxn because they react with the substrate and are reformed
The mass number stays the number but the atomic number decreases by one - usually resulting in another element
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
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R


39. 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
Density (gravitational constant) height
A saturated solution in which the aqueous ions are in equilibrium with the solid
E = (kq)/r^2


40. If the equation says that the E^o has (-) voltage when being reduced - but it is being oxidized in the problem - what does the voltage then become?
A salt and water
Ease of polarizability of the molecule and thus increasing molecular weight of mass
Energy
(+)


41. How would you find rate of rxn from pH 1 to pH2?
Polar
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
Decreasing potential energy
Attractive molecular forces acting between material surfaces in contact


42. What is the relationship between P and n in PV=nRT?
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
+/- 1/2
[A]^a[B]^b
They are directly proportional


43. What is the equation for work done?
You look at what is being oxidized and reduced in the problem
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
W = F(displacement)
Its intensity in the spectrum


44. A floating ice cube implies that it's weight is balanced by what?
Where an event took place
Its momentum is zero because velocity is zero; zero because of conservation of momentum
It's weight = mg; h
The buoyant force on it; W = mg = pVg


45. How do you find wavelength if you known distance from adjacent crests and troughs?
Its twice that distance
(+)
L = wavelength/2 so L= (wavelength)(2)
Accelerated by a higher voltage between the cathode and anode


46. What is the spin projection quantum number?
0 Hz because they are traveling side by side at the same speed
+/- 1/2
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c
The lowest whole number ratio of moles of each element in a mole of a cmpd


47. What do electrolytic techniques involve?
Isolating an atom from minerals by decomposing the minerals with an electric current
H = negative and S = 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
T = 2pi/angular velocity; v/r


48. Beta decay is the emission of what? How do you know what it is the emission of?
A positron or electron; when atomic number goes up you know an electron has been emitted
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
Force times the distance over which the force acts
Colligative: it depends on the number of solute molecules in a given volume of water


49. What gas is evolved when copper is placed in a nitric acid (HNO3) solution? This is what type of rxn?
NO; reduction-oxidation
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
Isolating an atom from minerals by decomposing the minerals with an electric current
Vertically; perpendicular to all surfaces


50. What happens to a negatively charged particle put between two parallel plates?
No - it increases the speed at which the rxn reaches that equilibrium
It experiences a constant electric force of qE and will thus accelerate towards the positive plate
A positron or electron; when atomic number goes up you know an electron has been emitted
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