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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. So if you have a voltage of 1/4V it will be reduced by what? Thus what will be the equation for the terminal voltage?
Isolating an atom from minerals by decomposing the minerals with an electric current
Pascal (N*m^2)
(density[p])(volume)
It will be reduced the voltage produced by the resistor which means IR; E- IR

2. The phase difference corresponding to a half wave is what? When do you get destructive interference?
Momentum
180 degrees; when there is half a wave distance in phase between two waves
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)
That they are catalysts in the rxn because they react with the substrate and are reformed

3. A floating ice cube implies that it's weight is balanced by what?
The buoyant force on it; W = mg = pVg
A constant force on a mass causes it to have a constant acceleration
Cathode; anode
Decreasing potential energy

4. Neither N2 or O2 have a permanent what? What does this mean?
A saturated solution in which the aqueous ions are in equilibrium with the solid
Polar
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces
A salt and water

5. If temperature arises during a mixture what can you conclude about the enthalpy?
An odd number
Strong acid and strong base/ weak acid and weak base
That it is negative
Cathode; anode

6. What does specific heat of a substance tell you? Thus what does a higher specific heat tell you?
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
Mv = mv
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
400 to 700 nm

7. What is the equation for bouyant force? What is p?
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
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
That it is negative
B = pVg; density

8. A nearsighted person has what type of focal length? Thus what do we do to correct this?
Shorter than it should be so rays from a distant object form in front of retina; use divergent lens
Positive
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors

9. What is usually conserved over oscillation periods?
Liquid displaced by that object
Mg
Voltage
Energy

10. What is the law of conservation of linear momentum?
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
Mv = mv
They increase because you hear a lower frequency
Positive

11. Can a catalyst shift equilibrium?
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c
Constant to overcome the heat of fusion (solid to liquid state)
No - it increases the speed at which the rxn reaches that equilibrium
Mag and direction

12. The probability of an X-ray emission event at a given wavelength is measured by what?
The reaction between the base and water
Its intensity in the spectrum
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
When you have central atom with six ions on it

13. What energy conversion describes best what takes place in a battery-powered resistive circuit?
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
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
NO; reduction-oxidation

14. How do you balance redox rxns?

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15. Why are bonds between H and another atom shorter compared to most?
H has a small atomic radius
(density[p])(volume)
Sp^3
The number of electrons emitted

16. If asked which electron configuration of an element is most stable which one do you choose?
Shorter than it should be so rays from a distant object form in front of retina; use divergent lens
The regular one
It experiences a constant electric force of qE and will thus accelerate towards the positive plate
Positron because this is known as positron decay/electron capture

17. 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?
Decreasing potential energy
W = F(displacement)
Its momentum is zero because velocity is zero; zero because of conservation of momentum
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

18. In radioactive decay the atomic number (A) and mass number (Z) must what?
They must balance
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c
Pascal (N*m^2)
The cross-sectional area through which the fluid flows

19. In a galvanic and electrolytic cell - reduction of an ion occurs where? Oxidation of an ion occurs where?
It has a positive oxidation potential so it is easily oxidized
(density[p])(volume)
1) Young's Modulus 2) Shear Modulus 3) Bulk Modulus
Cathode; anode

20. If both weight and bouyant force are dependent on g - that makes g independent of what?
That it is negative
Positron because this is known as positron decay/electron capture
The volume of the ice cube or whatever it is
H = negative and S = positive

21. Regarding M(OH)2 and you have solubility (S) - what would the Ksp be?
[S][2S]^2 = 4S^3
Where an event took place
+/- 1/2
Yes - if the particle's trail is equidistant between two adjacent anodes

22. Beta decay is the same as what?
Mg
They increase because you hear a lower frequency
Positron emission
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

23. 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?
The element's mass number
An odd number
The density of the water and volume of the lead object
0 Hz because they are traveling side by side at the same speed

24. What is the equation for pressure?
Voltage
Its intensity in the spectrum
They increase because you hear a lower frequency
Density (gravitational constant) height

25. How do you find length of time something is in flight? How do you find distance it traveled?
T = (2h/g)^1/2; distance = vt
P = IV
It can also equal 'mg'; the compressive strength of a substance
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

26. 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?
It will be reduced the voltage produced by the resistor which means IR; E- IR
No - it increases the speed at which the rxn reaches that equilibrium
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure
F = GMm/r^2

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

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28. Isotopes have diff number of ______ but same what?
Neutrons; atomic number
It will increase as well because they are directly related - only if pressure is kept constant
Going from solid to gas phase
The path is longer on the inclined plane so it will take object longer to reach the bottom

29. What is the magnetic quantum number?
-l to +l
Only temperature of the water bath
Ability to locate an event in space
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors

30. What color is above 656 nm?
6.02 x 10^23 ions/mol
The current is the same
Red
It will be reduced the voltage produced by the resistor which means IR; E- IR

31. How do you find specific gravity of an object?
F = GMm/r^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
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
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

32. Beta decay is the emission of what? How do you know what it is the emission of?
E = (kq)/r^2
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
A positron or electron; when atomic number goes up you know an electron has been emitted
The volume of the ice cube or whatever it is

33. 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?
It will be reduced the voltage produced by the resistor which means IR; E- IR
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
The particle's charge and the magnitude of the electric field
The regular one

34. What is different between an inclined plane and free fall?
It has a positive oxidation potential so it is easily oxidized
Add them together
The density of the water and volume of the lead object
The path is longer on the inclined plane so it will take object longer to reach the bottom

35. What is the amt of energy that a frictional force generates?
The number of electrons emitted
The mass number stays the number but the atomic number decreases by one - usually resulting in another element
Force times the distance over which the force acts
One that has more solute particles per liter of solution

36. If something is very toxic to a human - what Ksp value should it have for it to be the safest?
The lowest one
T = (2h/g)^1/2; distance = vt
One mole of electric charge
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

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

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38. How do you find the equiv capacitance of capacitors in series and parallel? What about if you are trying to find equivalent resistance?
W = F(displacement)
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 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
The element's mass number

39. 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?
Only temperature of the water bath
It has a positive oxidation potential so it is easily oxidized
An odd number
When electron falls from high energy to low energy level

40. If you are given density and volume how do you find mass?
Mg
You look at what is being oxidized and reduced in the problem
The current is the same
(density[p])(volume)

41. The range of pH in which a color change takes place in a titration depends on what?
Constant to overcome the heat of fusion (solid to liquid state)
(density[p])(volume)
Colligative: it depends on the number of solute molecules in a given volume of water
When HIn is turned into In- - which is dependent upon the pKa of the indicator

42. 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?
(+)
Mg
A saturated solution in which the aqueous ions are in equilibrium with the solid
180 degrees; when there is half a wave distance in phase between two waves

43. In general what is formed by an acid-base rxn?
[S][2S]^2 = 4S^3
T = 2pi/angular velocity; v/r
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles
A salt and water

44. 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
The element's mass number
In the presence of a base
7 always!!!

45. How should the period of a waveform be calculated?
When electron falls from high energy to low energy level
From peak to peak
A salt and water
The force along the board to the normal force

46. The square root of 10^anything is equal to what?
Positron because this is known as positron decay/electron capture
Alkali metals = first column
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous
Half of the exponent

47. How do you find wavelength if you known distance from adjacent crests and troughs?
Its twice that distance
Mag and direction
Total internal reflection
The lowest whole number ratio of moles of each element in a mole of a cmpd

48. When a falling mass is at terminal speed - what is the power expended by the air resistance?
P = F(v) = mg(v -terminal)
Helium; 4
When HIn is turned into In- - which is dependent upon the pKa of the indicator
The buoyant force on it; W = mg = pVg

49. Kb is the equilibrium constant for what?
Mg
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
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
The reaction between the base and water

50. The coefficient of kinetic friction is always lower than what? Therefore what?
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
That of static friction; there is a net accelerating force on the block once it starts to slide
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
When all the external forces = zero