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DSST Physical Sciences2

Subjects : dsst, science

Instructions:

Answer 50 questions in 15 minutes.
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Match each statement with the correct term.
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1. What gas is evolved when copper is placed in a nitric acid (HNO3) solution? This is what type of rxn?
-l to +l
Electrons from anode and battery
NO; reduction-oxidation
Energy

2. If you have circuit elements in parallel what is the same across them?
Voltage
The path is longer on the inclined plane so it will take object longer to reach the bottom
Neutrons; atomic number
P = IV

3. In a galvanic and electrolytic cell - reduction of an ion occurs where? Oxidation of an ion occurs where?
Cathode; anode
Mv = mv
H = negative and S = positive
The volume of the ice cube or whatever it is

4. 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?
0 Hz because they are traveling side by side at the same speed
L = wavelength/2 so L= (wavelength)(2)
1) Young's Modulus 2) Shear Modulus 3) Bulk Modulus
The buoyant force on it; W = mg = pVg

5. Strength of dispersion force increases with what?
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
(density[p])(volume)
Ease of polarizability of the molecule and thus increasing molecular weight of mass
P = IV

6. What is Avagadro's number regarding ions/mol?
Pascal (N*m^2)
W = F(displacement)
6.02 x 10^23 ions/mol
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

7. A cmpd with the lowest carbon to oxygen ratio will require how much oxygen for combustion?
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
That it is negative
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio
The nucleus gains a proton and no neutrons

8. What is the unit for Young's Modulus?
Force times the distance over which the force acts
It will increase as well because they are directly related - only if pressure is kept constant
Pascal (N*m^2)
Strong acid and strong base/ weak acid and weak base

9. Does the temperature of a water bath or amount of water in a water bath determines if a substance melts?
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
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
Only temperature of the water bath
Ease of polarizability of the molecule and thus increasing molecular weight of mass

10. What is Newton's Universal Law of Gravitation?
180 degrees; when there is half a wave distance in phase between two waves
+/- 1/2
F = GMm/r^2
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

11. What is the hybridization of oxygen in water and other oxygens similar to water with two bonds and two lone pairs of electrons?
The cross-sectional area through which the fluid flows
Sp^3
Energy
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure

12. What do electrolytic techniques involve?
An odd number
Isolating an atom from minerals by decomposing the minerals with an electric current
Positron because this is known as positron decay/electron capture
The lowest whole number ratio of moles of each element in a mole of a cmpd

13. 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?
Half of the exponent
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
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

14. What is the doppler equation for wavelength and frequency?
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c
1000
Force times the distance over which the force acts
When HIn is turned into In- - which is dependent upon the pKa of the indicator

15. An alpha particle can also be assumed to be what element? What is the mass number of Helium?
The density of the water and volume of the lead object
Helium; 4
Yes - if the particle's trail is equidistant between two adjacent anodes
A saturated solution in which the aqueous ions are in equilibrium with the solid

16. What is one faraday equal to?
T = 2pi/angular velocity; v/r
Electron shell number
One mole of electric charge
Neutrons; atomic number

17. 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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18. How do you find the equiv capacitance of capacitors in series and parallel? What about if you are trying to find equivalent resistance?
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
Pascal (N*m^2)
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
The buoyant force on it; W = mg = pVg

19. The concentration of OH and H30 ions are approximately equal at what pH?
One mole of electric charge
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
Momentum
7 always!!!

20. If temperature arises during a mixture what can you conclude about the enthalpy?
180 degrees; when there is half a wave distance in phase between two waves
That it is negative
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 density of the water and volume of the lead object

21. A floating ice cube implies that it's weight is balanced by what?
The buoyant force on it; W = mg = pVg
P = F(v) = mg(v -terminal)
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

22. Neither N2 or O2 have a permanent what? What does this mean?
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces
Sp^3
Positron because this is known as positron decay/electron capture
Shorter than it should be so rays from a distant object form in front of retina; use divergent lens

23. An oxidation-reduction rxn that occurs spontaneously has what kind of E^o for the cell?
Cathode; anode
Positron emission
Positive
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R

24. How would you find rate of rxn from pH 1 to pH2?
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
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
L = wavelength/2 so L= (wavelength)(2)
That they are catalysts in the rxn because they react with the substrate and are reformed

25. When the source of a sound is flying away from you what happens to the wavelengths from peak to peak?
The nucleus gains a proton and no neutrons
The buoyant force on it; W = mg = pVg
They increase because you hear a lower frequency
That they are catalysts in the rxn because they react with the substrate and are reformed

26. The volume of an object is equal to water?
Liquid displaced by that object
The reaction between the base and water
Attractive molecular forces acting between material surfaces in contact
-l to +l

27. What does specific heat of a substance tell you? Thus what does a higher specific heat tell you?
You look at what is being oxidized and reduced in the problem
Gravity
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
The force along the board to the normal force

28. 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
Accelerated by a higher voltage between the cathode and anode
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
Liquid displaced by that object

29. What kind of charge is on Al?
3+
It's weight = mg; h
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
E = (kq)/r^2

30. Friction is caused by what?
The lowest whole number ratio of moles of each element in a mole of a cmpd
You look at what is being oxidized and reduced in the problem
H = negative and S = positive
Attractive molecular forces acting between material surfaces in contact

31. Acetic acid is a ______ solvent
When you have central atom with six ions on it
Polar
Mv = mv
Constant to overcome the heat of fusion (solid to liquid state)

32. The coefficient of static friction is the ratio of what?
The force along the board to the normal force
From peak to peak
One that has more solute particles per liter of solution
It can absorb light that lets other electrons fill those orbitals

33. 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?
Colligative: it depends on the number of solute molecules in a given volume of water
Add them together
W = F(displacement)
Colligative; the number of solute particles present

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?
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect
(density[p])(volume)
It decreases; the work done by the gas in expanding decreases its internal energy
F = GMm/r^2

35. A pendulum moves under the influence of what?
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect
-l to +l
Gravity
Positron emission

36. When you are trying to calculate a galvanic cell's emf - what do you look at?
400 to 700 nm
You look at what is being oxidized and reduced in the problem
L = wavelength/2 so L= (wavelength)(2)
The lowest one

37. What does spatial resolution refer to?
Ability to locate an event in space
No - it increases the speed at which the rxn reaches that equilibrium
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
When you have central atom with six ions on it

38. 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?
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
F =ma and F= qE
Yes - if the particle's trail is equidistant between two adjacent anodes

39. If you have longer wavelengths how is their freq and energy compared to shorter wavelengths?
Electron shell number
No - it increases the speed at which the rxn reaches that equilibrium
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
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous

40. In Bohr model of atom when is energy emitted?
When all the external forces = zero
Cathode; anode
When electron falls from high energy to low energy level
The force along the board to the normal force

41. When a falling mass is at terminal speed - what is the power expended by the air resistance?
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
Energy
Accelerated by a higher voltage between the cathode and anode
P = F(v) = mg(v -terminal)

42. What color is above 656 nm?
Positron because this is known as positron decay/electron capture
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect
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
Red

43. 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?
Its momentum is zero because velocity is zero; zero because of conservation of momentum
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure
H has a small atomic radius
An odd number

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

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45. How do you find what is the limiting reagent? You can then use the moles of the limiting reagent to calculate what?
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water
They increase because you hear a lower frequency
Neutrons; atomic number
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

46. Light can be carried along a distance within a transparent material by means of what?
A positron or electron; when atomic number goes up you know an electron has been emitted
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles
Total internal reflection
(density[p])(volume)

47. What if the circuit elements are in series?
E = (kq)/r^2
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
The current is the same
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

48. What direction do gravity and bouyancy work? What direction does water pressure work?
6.02 x 10^23 ions/mol
Mg
Vertically; perpendicular to all surfaces
T = (2h/g)^1/2; distance = vt

49. The electrons emitted from cathode are replaced with what?
F = GMm/r^2
Mv = mv
The nucleus gains a proton and no neutrons
Electrons from anode and battery

50. 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
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
It has a positive oxidation potential so it is easily oxidized
External components of the circuit

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DSST Physical Sciences2

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