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DSST Physical Sciences2

Subjects : dsst, science

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 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
P = IV
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles
An odd number

2. 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?
[A]^a[B]^b
Decreasing potential energy
The path is longer on the inclined plane so it will take object longer to reach the bottom
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

3. How many mL is in one liter?
The nucleus gains a proton and no neutrons
Gravity
1000
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

4. What type of acid and base would produce a pH closest to 7?
Strong acid and strong base/ weak acid and weak base
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
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces
External components of the circuit

5. In a rxn - how do you figure out which atom has the highest electron affinity?
Where an event took place
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
When HIn is turned into In- - which is dependent upon the pKa of the indicator
(density[p])(volume)

6. As a balloon rises in a tank of water what happens to the temperature inside it? Why would this happen?
One mole of electric charge
Liquid displaced by that object
It decreases; the work done by the gas in expanding decreases its internal energy
A constant force on a mass causes it to have a constant acceleration

7. The freezing point of an aqueous solution is what kind of property? What does this mean?
+/- 1/2
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
Colligative: it depends on the number of solute molecules in a given volume of water
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect

8. 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?
Total internal reflection
Faraday/electrons
It has a positive oxidation potential so it is easily oxidized
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

9. What is the principal quantum number (n)?
The regular one
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
Electron shell number
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect

10. What happens to a negatively charged particle put between two parallel plates?
It experiences a constant electric force of qE and will thus accelerate towards the positive plate
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c
At an equal distance behind it as the object is in front of the mirror

11. Acetic acid is a ______ solvent
Faraday/electrons
Polar
It can also equal 'mg'; the compressive strength of a substance
Momentum

12. What gas is evolved when copper is placed in a nitric acid (HNO3) solution? This is what type of rxn?
NO; reduction-oxidation
Mv = mv
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
Accelerated by a higher voltage between the cathode and anode

13. What are the three separate module for tensile stress - shear stress - and compression/expansion?

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14. How do the final velocities differ if a sphere is dropped from a distance rather than rolled down an inclined plane?
Alkali metals = first column
It will be reduced the voltage produced by the resistor which means IR; E- IR
They do not differ
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed

15. Considering the answer in the last slide - what kind of a solution would have a lower freezing pt?
[A]^a[B]^b
Mg
Shorter than it should be so rays from a distant object form in front of retina; use divergent lens
One that has more solute particles per liter of solution

16. What is one faraday equal to?
Helium; 4
One mole of electric charge
400 to 700 nm
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

17. What does the empirical formula show?
That of static friction; there is a net accelerating force on the block once it starts to slide
Only temperature of the water bath
Its twice that distance
The lowest whole number ratio of moles of each element in a mole of a cmpd

18. The concentration of OH and H30 ions are approximately equal at what pH?
Its intensity in the spectrum
7 always!!!
3+
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

19. The number of incident photons on the cathode affect what?
Voltage
It will increase as well because they are directly related - only if pressure is kept constant
Positive
The number of electrons emitted

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

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21. What is the magnetic quantum number?
When electron falls from high energy to low energy level
-l to +l
Half of the exponent
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

22. 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?
A positron or electron; when atomic number goes up you know an electron has been emitted
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
Voltage

23. The phase difference corresponding to a half wave is what? When do you get destructive interference?
180 degrees; when there is half a wave distance in phase between two waves
Colligative: it depends on the number of solute molecules in a given volume of water
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous
That it is negative

24. When you are trying to calculate a galvanic cell's emf - what do you look at?
Positron emission
It has a positive oxidation potential so it is easily oxidized
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 what is being oxidized and reduced in the problem

25. What is the unit for Young's Modulus?
E = (kq)/r^2
Alkali metals = first column
Pascal (N*m^2)
H = negative and S = positive

26. The square root of 10^anything is equal to what?
Momentum
A positron or electron; when atomic number goes up you know an electron has been emitted
Half of the exponent
Shorter than it should be so rays from a distant object form in front of retina; use divergent lens

27. Friction is caused by what?
F = GMm/r^2
The mass number stays the number but the atomic number decreases by one - usually resulting in another element
Attractive molecular forces acting between material surfaces in contact
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

28. A nearsighted person has what type of focal length? Thus what do we do to correct this?
It can absorb light that lets other electrons fill those orbitals
The buoyant force on it; W = mg = pVg
180 degrees; when there is half a wave distance in phase between two waves
Shorter than it should be so rays from a distant object form in front of retina; use divergent lens

29. The basicity constant Kb measures what?
How strong a base is
That of static friction; there is a net accelerating force on the block once it starts to slide
NO; reduction-oxidation
That it is negative

30. Kb is the equilibrium constant for what?
The reaction between the base and water
Mg
-l to +l
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting

31. When the source of a sound is flying away from you what happens to the wavelengths from peak to peak?
They increase because you hear a lower frequency
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
(density[p])(volume)
Mag and direction

32. What kind of metals react violently with water?
[S][2S]^2 = 4S^3
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
Alkali metals = first column
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure

33. Heat from friction comes from what?
Decreasing potential energy
NO; reduction-oxidation
E = (kq)/r^2
Mg

34. 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
A salt and water
Negative
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14

35. Nuclear masses can be approximated from what?

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36. The coefficient of static friction is the ratio of what?
The force along the board to the normal force
Red
1000
Add them together

37. How do you balance redox rxns?

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38. 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
When all the external forces = zero
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
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2

39. Terminal voltage is provided to what?
External components of the circuit
When all the external forces = zero
Mag and direction
+/- 1/2

40. When a falling mass is at terminal speed - what is the power expended by the air resistance?
It decreases; the work done by the gas in expanding decreases its internal energy
Its intensity in the spectrum
P = F(v) = mg(v -terminal)
Only temperature of the water bath

41. How do you find length of time something is in flight? How do you find distance it traveled?
0 Hz because they are traveling side by side at the same speed
T = (2h/g)^1/2; distance = vt
Mag and direction
Negative

42. Young's modulus is a ________ for a material. What is it's ratio? What would a graph of it look like?
Vertically; perpendicular to all surfaces
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect

43. An oxidation-reduction rxn that occurs spontaneously has what kind of E^o for the cell?
Positive
Colligative; the number of solute particles present
[S][2S]^2 = 4S^3
They must balance

44. The force on an electrical charge is what?
F =ma and F= qE
6.02 x 10^23 ions/mol
1) Young's Modulus 2) Shear Modulus 3) Bulk Modulus
That it is negative

45. If both weight and bouyant force are dependent on g - that makes g independent of what?
Density (gravitational constant) height
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
The cross-sectional area through which the fluid flows
The volume of the ice cube or whatever it is

46. The coefficient of kinetic friction is always lower than what? Therefore what?
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
Energy
How strong a base is
That of static friction; there is a net accelerating force on the block once it starts to slide

47. What is the net result on a nucleus when you absorb a deuturon and emit a neutron?
The nucleus gains a proton and no neutrons
Isolating an atom from minerals by decomposing the minerals with an electric current
A positron or electron; when atomic number goes up you know an electron has been emitted
It's weight = mg; the work would be the weight times the distance fell

48. The Ksp for a substance of AaBb is what?
Alkali metals = first column
No - it increases the speed at which the rxn reaches that equilibrium
It's weight = mg; the work would be the weight times the distance fell
[A]^a[B]^b

49. Why is it important that the materials used as scintillators are nearly transparent to the wavelength of light they emit?
Strong acid and strong base/ weak acid and weak base
Only temperature of the water bath
The volume of the ice cube or whatever it is
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

50. What is the equation for pressure?
Electrons from anode and battery
That of static friction; there is a net accelerating force on the block once it starts to slide
Toward the side with more gaseous molecules; towards the side that doesn't give off as much heat (remember heat is given off when molecules are formed and thus (-) enthalpy)
Density (gravitational constant) height