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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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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. Isotopes have diff number of ______ but same what?
Colligative: it depends on the number of solute molecules in a given volume of water
Half of the exponent
When HIn is turned into In- - which is dependent upon the pKa of the indicator
Neutrons; atomic number

2. The coefficient of static friction is the ratio of what?
Sp^3
The number of electrons emitted
Mag and direction
The force along the board to the normal force

3. Neither N2 or O2 have a permanent what? What does this mean?
No - it increases the speed at which the rxn reaches that equilibrium
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces
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
(+)

4. When does red litmus paper turn blue?
In the presence of a base
H = negative and S = positive
They must balance
Cathode; anode

5. What is conserved in an inellastic collision?
Momentum
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
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
Only temperature of the water bath

6. The volume of an object is equal to water?
P = F(v) = mg(v -terminal)
Liquid displaced by that object
When HIn is turned into In- - which is dependent upon the pKa of the indicator
Electron shell number

7. When looking at which combo of acids and bases will result in a solution with pH of 7 what do we look for?
One mole of electric charge
It can also equal 'mg'; the compressive strength of a substance
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
The density of the water and volume of the lead object

8. 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
When you have central atom with six ions on it
Colligative: it depends on the number of solute molecules in a given volume of water
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

9. Strength of dispersion force increases with what?
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 blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure
Ease of polarizability of the molecule and thus increasing molecular weight of mass
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)

10. The visible spectrum ranges from ____ to _____
400 to 700 nm
1) Young's Modulus 2) Shear Modulus 3) Bulk Modulus
Its momentum is zero because velocity is zero; zero because of conservation of momentum
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4

11. Thus is Zn (which has positive oxidation potential) reacts with HCl - will any rxn take place?
It decreases; the work done by the gas in expanding decreases its internal energy
A positron or electron; when atomic number goes up you know an electron has been emitted
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting

12. The number of incident photons on the cathode affect what?
The number of electrons emitted
Total internal reflection
When electron falls from high energy to low energy level
The mass number stays the number but the atomic number decreases by one - usually resulting in another element

13. If you have longer wavelengths how is their freq and energy compared to shorter wavelengths?
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
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous
No - it increases the speed at which the rxn reaches that equilibrium

14. If something is very toxic to a human - what Ksp value should it have for it to be the safest?
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water
You look at what is being oxidized and reduced in the problem
The lowest one

15. What is the equation for work done?
[S][2S]^2 = 4S^3
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
Neutrons; atomic number
W = F(displacement)

16. 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?
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
NO; reduction-oxidation
The density of the water and volume of the lead object
Liquid displaced by that object

17. 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
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
Mg

18. Why are bonds between H and another atom shorter compared to most?
It can absorb light that lets other electrons fill those orbitals
H has a small atomic radius
It's weight = mg; the work would be the weight times the distance fell
0 Hz because they are traveling side by side at the same speed

19. What is sublimation?
The volume of the ice cube or whatever it is
Going from solid to gas phase
7 always!!!
1) Young's Modulus 2) Shear Modulus 3) Bulk Modulus

20. What if the circuit elements are in series?
External components of the circuit
The current is the same
The number of electrons emitted
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure

21. The concentration of OH and H30 ions are approximately equal at what pH?
Its intensity in the spectrum
7 always!!!
It has a positive oxidation potential so it is easily oxidized
That of static friction; there is a net accelerating force on the block once it starts to slide

22. How do you find length of time something is in flight? How do you find distance it traveled?
Mag and direction
Colligative; the number of solute particles present
Positive
T = (2h/g)^1/2; distance = vt

23. As a balloon rises in a tank of water what happens to the temperature inside it? Why would this happen?
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces
It decreases; the work done by the gas in expanding decreases its internal energy
Total internal reflection
That it is negative

24. What do electrolytic techniques involve?
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
Isolating an atom from minerals by decomposing the minerals with an electric current
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
It will be reduced the voltage produced by the resistor which means IR; E- IR

25. What is one faraday equal to?
Only temperature of the water bath
One mole of electric charge
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect

26. How do you balance redox rxns?

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27. 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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28. If you are given density and volume how do you find mass?
(density[p])(volume)
When electron falls from high energy to low energy level
When all the external forces = zero
Gravity

29. If you have circuit elements in parallel what is the same across them?
Voltage
(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)
Mg

30. The freezing point of an aqueous solution is what kind of property? What does this mean?
Colligative: it depends on the number of solute molecules in a given volume of water
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
A constant force on a mass causes it to have a constant acceleration
It can absorb light that lets other electrons fill those orbitals

31. What does the empirical formula show?
The lowest whole number ratio of moles of each element in a mole of a cmpd
The path is longer on the inclined plane so it will take object longer to reach the bottom
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
Ability to locate an event in space

32. Young's modulus is a ________ for a material. What is it's ratio? What would a graph of it look like?
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant
It will be reduced the voltage produced by the resistor which means IR; E- IR
Ability to locate an event in space
The regular one

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?
Add them together
It can also equal 'mg'; the compressive strength of a substance
NO; reduction-oxidation
The volume of the ice cube or whatever it is

34. Equivalent mass is what?
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
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
Add them together
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting

35. In PV=nRT - if temp increases what will happen to volume?
It will increase as well because they are directly related - only if pressure is kept constant
Alkali metals = first column
It can absorb light that lets other electrons fill those orbitals
F = GMm/r^2

36. How do you find 'g' from Newton's law of gravity?
Polar
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
(density[p])(volume)

37. Why is it important that the materials used as scintillators are nearly transparent to the wavelength of light they emit?
Neutrons; atomic number
Force times the distance over which the force acts
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
It will be reduced the voltage produced by the resistor which means IR; E- IR

38. In a healthy person standing at rest - a comparison of arterial blood pressure measured in the arm with that in the leg - shows what about the differences between these pressures?
Momentum
Colligative: it depends on the number of solute molecules in a given volume of water
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure
Where an event took place

39. What is usually conserved over oscillation periods?
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
Energy
180 degrees; when there is half a wave distance in phase between two waves
Yes - if the particle's trail is equidistant between two adjacent anodes

40. Half-sine wave shape is what kind of wavelength with regards to length?
The current is the same
L = wavelength/2 so L= (wavelength)(2)
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting
Positron because this is known as positron decay/electron capture

41. What are the units of an electric field?
They must balance
Sp^3
V/m or N/C
180 degrees; when there is half a wave distance in phase between two waves

42. What is Avagadro's number regarding ions/mol?
Positron because this is known as positron decay/electron capture
6.02 x 10^23 ions/mol
In the presence of a base
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure

43. When an element decreases its atomic number by one what is emitted?
It will increase as well because they are directly related - only if pressure is kept constant
Colligative: it depends on the number of solute molecules in a given volume of water
A constant force on a mass causes it to have a constant acceleration
Positron because this is known as positron decay/electron capture

44. What is the formula for the power supplied by a battery to accelerate an electron beam?
Strong acid and strong base/ weak acid and weak base
Zero
P = IV
The mass number stays the number but the atomic number decreases by one - usually resulting in another element

45. What is the magnetic quantum number?
Electrons from anode and battery
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)
-l to +l
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous

46. What happens to a negatively charged particle put between two parallel plates?
Going from solid to gas phase
It experiences a constant electric force of qE and will thus accelerate towards the positive plate
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
Ability to locate an event in space

47. The force on an electrical charge is what?
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
F =ma and F= qE
They must balance
Energy

48. 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
Strong acid and strong base/ weak acid and weak base
Constant to overcome the heat of fusion (solid to liquid state)
Going from solid to gas phase

49. Kb is the equilibrium constant for what?
An odd number
The reaction between the base and water
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
Total internal reflection

50. if lead is successively preciptated as PbSO4 - PbI - and PbCO2 - which is less soluble than which? Thus which anions will be precipitated first?
Momentum
External components of the circuit
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
Positive