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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.
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. The total pressure of a solution is what? Give example.
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
Going from solid to gas phase
[S][2S]^2 = 4S^3
6.02 x 10^23 ions/mol

2. 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
Yes - if the particle's trail is equidistant between two adjacent anodes
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

3. Kb is the equilibrium constant for what?
Decreasing potential energy
When HIn is turned into In- - which is dependent upon the pKa of the indicator
When you have central atom with six ions on it
The reaction between the base and water

4. 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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5. In PV=nRT - if temp increases what will happen to volume?
Liquid displaced by that object
It will increase as well because they are directly related - only if pressure is kept constant
That they are catalysts in the rxn because they react with the substrate and are reformed
Neutrons; atomic number

6. Equivalent mass is what?
[S][2S]^2 = 4S^3
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
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
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure

7. Isotopes have diff number of ______ but same what?
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water
Neutrons; atomic number
P = F(v) = mg(v -terminal)

8. Pressure in a liquid is proportional to what? So why does this explain why blood pressure is greater in legs?
400 to 700 nm
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
The lowest one
Positron emission

9. Light can be carried along a distance within a transparent material by means of what?
The cross-sectional area through which the fluid flows
Ease of polarizability of the molecule and thus increasing molecular weight of mass
The regular one
Total internal reflection

10. What is the equation for bouyant force? What is p?
[S][2S]^2 = 4S^3
Constant to overcome the heat of fusion (solid to liquid state)
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
B = pVg; density

11. If something is very toxic to a human - what Ksp value should it have for it to be the safest?
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
The lowest one
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous
When all the external forces = zero

12. What are the units of an electric field?
V/m or N/C
Its intensity in the spectrum
Colligative; the number of solute particles present
Alkali metals = first column

13. The coefficient of kinetic friction is always lower than what? Therefore what?
Mg
Ability to locate an event in space
Vertically; perpendicular to all surfaces
That of static friction; there is a net accelerating force on the block once it starts to slide

14. When a falling mass is at terminal speed - what is the power expended by the air resistance?
From peak to peak
Positron emission
P = F(v) = mg(v -terminal)
7 always!!!

15. Neither N2 or O2 have a permanent what? What does this mean?
A salt and water
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces
Isolating an atom from minerals by decomposing the minerals with an electric current
The volume of the ice cube or whatever it is

16. What is the law of conservation of linear momentum?
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 current is the same
The density of the water and volume of the lead object
Mv = mv

17. What is the magnetic quantum number?
-l to +l
It has a positive oxidation potential so it is easily oxidized
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant
External components of the circuit

18. In Bohr model of atom when is energy emitted?
Going from solid to gas phase
Momentum
When electron falls from high energy to low energy level
Negative

19. How would you find rate of rxn from pH 1 to pH2?
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
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
An odd number
[A]^a[B]^b

20. The basicity constant Kb measures what?
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
How strong a base is
A positron or electron; when atomic number goes up you know an electron has been emitted
Its intensity in the spectrum

21. What is one faraday equal to?
One mole of electric charge
-l to +l
When electron falls from high energy to low energy level
Liquid displaced by that object

22. What kind of geometry is octahedral?
+/- 1/2
When you have central atom with six ions on it
It has a positive oxidation potential so it is easily oxidized
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)

23. 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?
It has a positive oxidation potential so it is easily oxidized
180 degrees; when there is half a wave distance in phase between two waves
Force times the distance over which the force acts
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

24. How do you find length of time something is in flight? How do you find distance it traveled?
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
No - it increases the speed at which the rxn reaches that equilibrium
T = (2h/g)^1/2; distance = vt
The particle's charge and the magnitude of the electric field

25. The boiling point of a solution is what type of property? Which means is depends only on what?
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
The density of the water and volume of the lead object
Colligative; the number of solute particles present

26. 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?
Strong acid and strong base/ weak acid and weak base
Add them together
It will increase as well because they are directly related - only if pressure is kept constant
At an equal distance behind it as the object is in front of the mirror

27. Why is it important that the materials used as scintillators are nearly transparent to the wavelength of light they emit?
3+
Its twice that distance
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
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

28. What kind of charge is on Al?
3+
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 increase as well because they are directly related - only if pressure is kept constant
They are directly proportional

29. Heat from friction comes from what?
Force times the distance over which the force acts
Decreasing potential energy
One mole of electric charge
NO; reduction-oxidation

30. What is weight equal to?
Only temperature of the water bath
Mg
It's weight = mg; the work would be the weight times the distance fell
Electron shell number

31. How do you find moles of a substance when you are given faradays and electrons?
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
The lowest whole number ratio of moles of each element in a mole of a cmpd
L = wavelength/2 so L= (wavelength)(2)
Faraday/electrons

32. Why does light travel slower in an optically dense medium than through a vacuum?
Vertically; perpendicular to all surfaces
The element's mass number
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect

33. Melting occurs at what type of temperature? Why?
The regular one
Add them together
From peak to peak
Constant to overcome the heat of fusion (solid to liquid state)

34. Half-sine wave shape is what kind of wavelength with regards to length?
L = wavelength/2 so L= (wavelength)(2)
Going from solid to gas phase
Neutrons; atomic number
Strong acid and strong base/ weak acid and weak base

35. How do you find 'g' from Newton's law of gravity?
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
Mag and direction
H has a small atomic radius
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2

36. What is the hybridization of oxygen in water and other oxygens similar to water with two bonds and two lone pairs of electrons?
F = GMm/r^2
Sp^3
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
F =ma and F= qE

37. How do you find the equiv capacitance of capacitors in series and parallel? What about if you are trying to find equivalent resistance?
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
When you have central atom with six ions on it
(+)
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

38. 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?
They are directly proportional
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
Only temperature of the water bath
The density of the water and volume of the lead object

39. The visible spectrum ranges from ____ to _____
400 to 700 nm
The element's mass number
Its twice that distance
P = IV

40. How do you find specific gravity of an object?
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio
At an equal distance behind it as the object is in front of the mirror
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
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

41. A plane mirror produces an image where?
At an equal distance behind it as the object is in front of the mirror
Sp^3
-l to +l
One mole of electric charge

42. What is the magnitude of the electric field produced by a point charge?
Momentum
E = (kq)/r^2
One mole of electric charge
An odd number

43. Strength of dispersion force increases with what?
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water
Ease of polarizability of the molecule and thus increasing molecular weight of mass
T = 2pi/angular velocity; v/r
That it is negative

44. When you are trying to calculate a galvanic cell's emf - what do you look at?
Density (gravitational constant) height
Mg
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
You look at what is being oxidized and reduced in the problem

45. What happens to a negatively charged particle put between two parallel plates?
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
It experiences a constant electric force of qE and will thus accelerate towards the positive plate
[S][2S]^2 = 4S^3
Electrons from anode and battery

46. How do you find what is the limiting reagent? You can then use the moles of the limiting reagent to calculate what?
180 degrees; when there is half a wave distance in phase between two waves
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
The path is longer on the inclined plane so it will take object longer to reach the bottom
A constant force on a mass causes it to have a constant acceleration

47. What type of acid and base would produce a pH closest to 7?
1000
Strong acid and strong base/ weak acid and weak base
The regular one
L = wavelength/2 so L= (wavelength)(2)

48. In a rxn - how do you figure out which atom has the highest electron affinity?
Momentum
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
They do not differ
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

49. If you have circuit elements in parallel what is the same across them?
P = F(v) = mg(v -terminal)
Voltage
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
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. When the source of a sound is flying away from you what happens to the wavelengths from peak to peak?
Mass number stays the same but the atomic number increases
They increase because you hear a lower frequency
Mv = mv
They do not differ