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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. 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
1000
External components of the circuit
It decreases; the work done by the gas in expanding decreases its internal energy

2. If you have longer wavelengths how is their freq and energy compared to shorter wavelengths?
A positron or electron; when atomic number goes up you know an electron has been emitted
That they are catalysts in the rxn because they react with the substrate and are reformed
Its twice that distance
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous

3. 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?

4. What direction do gravity and bouyancy work? What direction does water pressure work?
A constant force on a mass causes it to have a constant acceleration
Vertically; perpendicular to all surfaces
L = wavelength/2 so L= (wavelength)(2)
B = pVg; density

5. In Bohr model of atom when is energy emitted?
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
Energy
When electron falls from high energy to low energy level

6. When looking at which combo of acids and bases will result in a solution with pH of 7 what do we look for?
The regular one
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
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

7. How do you find specific gravity of an object?
Attractive molecular forces acting between material surfaces in contact
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
Strong acid and strong base/ weak acid and weak base
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

8. What is sublimation?
Strong acid and strong base/ weak acid and weak base
Going from solid to gas phase
Density (gravitational constant) height
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. The force on an electrical charge is what?
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
F = GMm/r^2
F =ma and F= qE
The volume of the ice cube or whatever it is

10. What color is above 656 nm?
Red
0 Hz because they are traveling side by side at the same speed
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c
Colligative: it depends on the number of solute molecules in a given volume of water

11. The basicity constant Kb measures what?
At an equal distance behind it as the object is in front of the mirror
180 degrees; when there is half a wave distance in phase between two waves
Strong acid and strong base/ weak acid and weak base
How strong a base is

12. What is conserved in an inellastic collision?
A salt and water
That they are catalysts in the rxn because they react with the substrate and are reformed
Liquid displaced by that object
Momentum

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

14. How do you find moles of a substance when you are given faradays and electrons?
Faraday/electrons
A saturated solution in which the aqueous ions are in equilibrium with the solid
It can also equal 'mg'; the compressive strength of a substance
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

15. What happens to the atomic number and atomic mass of an element that go under Beta decay or positron emission?
Liquid displaced by that object
Mass number stays the same but the atomic number increases
F = GMm/r^2
External components of the circuit

16. 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?
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
When all the external forces = zero
The nucleus gains a proton and no neutrons
Pascal (N*m^2)

17. The free energy change (G) must be negative when what?
A constant force on a mass causes it to have a constant acceleration
H = negative and S = positive
The nucleus gains a proton and no neutrons
When electron falls from high energy to low energy level

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

19. What is Newton's Universal Law of Gravitation?
F = GMm/r^2
You look at what is being oxidized and reduced in the problem
It will increase as well because they are directly related - only if pressure is kept constant
The number of electrons emitted

20. What is the formula for the power supplied by a battery to accelerate an electron beam?
P = IV
NO; reduction-oxidation
V/m or N/C
That of static friction; there is a net accelerating force on the block once it starts to slide

21. 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?

22. Hydrogen has what kind of standard oxidation or reduction potential?
(density[p])(volume)
Energy
Zero
Red

23. Thus is Zn (which has positive oxidation potential) reacts with HCl - will any rxn take place?
The reaction between the base and water
Mag and direction
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
The element's mass number

24. The electrical force on a particle depends on what?

25. Terminal voltage is provided to what?
E = (kq)/r^2
External components of the circuit
[A]^a[B]^b
Half of the exponent

26. The coefficient of static friction is the ratio of what?
6.02 x 10^23 ions/mol
The force along the board to the normal force
The regular one
Yes - if the particle's trail is equidistant between two adjacent anodes

27. What is one faraday equal to?
It's weight = mg; h
One mole of electric charge
Strong acid and strong base/ weak acid and weak base
Alkali metals = first column

28. What does spatial resolution refer to?
The number of electrons emitted
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
They are directly proportional
Ability to locate an event in space

29. 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?
The lowest one
[S][2S]^2 = 4S^3
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces
(+)

30. When an element decreases its atomic number by one what is emitted?
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
F = GMm/r^2
Constant to overcome the heat of fusion (solid to liquid state)
Positron because this is known as positron decay/electron capture

31. Can a catalyst shift equilibrium?
Total internal reflection
No - it increases the speed at which the rxn reaches that equilibrium
(density[p])(volume)
Alkali metals = first column

32. Young's modulus is a ________ for a material. What is it's ratio? What would a graph of it look like?
Ease of polarizability of the molecule and thus increasing molecular weight of mass
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant
0 Hz because they are traveling side by side at the same speed
From peak to peak

33. Beta decay is the emission of what? How do you know what it is the emission of?
Faraday/electrons
A positron or electron; when atomic number goes up you know an electron has been emitted
At an equal distance behind it as the object is in front of the mirror
The path is longer on the inclined plane so it will take object longer to reach the bottom

34. What is Avagadro's number regarding ions/mol?
H has a small atomic radius
F =ma and F= qE
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
6.02 x 10^23 ions/mol

35. What energy conversion describes best what takes place in a battery-powered resistive circuit?
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
Total internal reflection
It will be reduced the voltage produced by the resistor which means IR; E- IR
It's weight = mg; h

36. The temperature of a metal will not increase above its melting point until what?
Its momentum is zero because velocity is zero; zero because of conservation of momentum
Vertically; perpendicular to all surfaces
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting

37. How many mL is in one liter?
1000
+/- 1/2
Attractive molecular forces acting between material surfaces in contact
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

38. When the source of a sound is flying away from you what happens to the wavelengths from peak to peak?
Faraday/electrons
They increase because you hear a lower frequency
Colligative: it depends on the number of solute molecules in a given volume of water
It will increase as well because they are directly related - only if pressure is kept constant

39. A cmpd with the lowest carbon to oxygen ratio will require how much oxygen for combustion?
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio
Total internal reflection
400 to 700 nm
It decreases; the work done by the gas in expanding decreases its internal energy

40. 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?
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure
Positive
One mole of electric charge
At an equal distance behind it as the object is in front of the mirror

41. 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)
Decreasing potential energy
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
Colligative; the number of solute particles present

42. Half-sine wave shape is what kind of wavelength with regards to length?
Red
L = wavelength/2 so L= (wavelength)(2)
At an equal distance behind it as the object is in front of the mirror
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14

43. If both weight and bouyant force are dependent on g - that makes g independent of what?
Mass number stays the same but the atomic number increases
Liquid displaced by that object
Ease of polarizability of the molecule and thus increasing molecular weight of mass
The volume of the ice cube or whatever it is

44. In a rxn - how do you figure out which atom has the highest electron affinity?
3+
It has a positive oxidation potential so it is easily oxidized
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
Positron emission

45. 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?
The lowest whole number ratio of moles of each element in a mole of a cmpd
Neutrons; atomic number
Add them together
The path is longer on the inclined plane so it will take object longer to reach the bottom

46. What is the spin projection quantum number?
F =ma and F= qE
Neutrons; atomic number
+/- 1/2
Its momentum is zero because velocity is zero; zero because of conservation of momentum

47. What is newton's second law?
A constant force on a mass causes it to have a constant acceleration
It's weight = mg; h
It can absorb light that lets other electrons fill those orbitals
In the presence of a base

48. The electrons emitted from cathode are replaced with what?
Pascal (N*m^2)
Voltage
Electron shell number
Electrons from anode and battery

49. As a balloon rises in a tank of water what happens to the temperature inside it? Why would this happen?
Zero
A constant force on a mass causes it to have a constant acceleration
It decreases; the work done by the gas in expanding decreases its internal energy
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water

50. What happens if an atom undergoes positron decay or electron capture?
The mass number stays the number but the atomic number decreases by one - usually resulting in another element
V/m or N/C
It has a positive oxidation potential so it is easily oxidized
Faraday/electrons