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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. 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 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
Zero
Electrons from anode and battery
The density of the water and volume of the lead object

2. When the source of a sound is flying away from you what happens to the wavelengths from peak to peak?
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 particle's charge and the magnitude of the electric field
They increase because you hear a lower frequency
Electrons from anode and battery

3. What is the law of conservation of linear momentum?
H = negative and S = positive
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 path is longer on the inclined plane so it will take object longer to reach the bottom
Mv = mv

4. When is a body in translational equilibrium?
External components of the circuit
1000
When all the external forces = zero
Isolating an atom from minerals by decomposing the minerals with an electric current

5. 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?
Helium; 4
An odd number
It has a positive oxidation potential so it is easily oxidized
Vertically; perpendicular to all surfaces

6. What is the relationship between P and n in PV=nRT?
A saturated solution in which the aqueous ions are in equilibrium with the solid
The path is longer on the inclined plane so it will take object longer to reach the bottom
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles
They are directly proportional

7. A cmpd with the lowest carbon to oxygen ratio will require how much oxygen for combustion?
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
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
400 to 700 nm
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio

8. What is Avagadro's number regarding ions/mol?
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
6.02 x 10^23 ions/mol
The path is longer on the inclined plane so it will take object longer to reach the bottom
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

9. Light can be carried along a distance within a transparent material by means of what?
Total internal reflection
(+)
The density of the water and volume of the lead object
They increase because you hear a lower frequency

10. The volume of an object is equal to water?
Liquid displaced by that object
Faraday/electrons
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)

11. How do you find what is the limiting reagent? You can then use the moles of the limiting reagent to calculate what?
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
[A]^a[B]^b
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
T = (2h/g)^1/2; distance = vt

12. 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?
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
0 Hz because they are traveling side by side at the same speed
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces
Sp^3

13. How do you find 'g' from Newton's law of gravity?
One that has more solute particles per liter of solution
The regular one
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure

14. The Ksp for a substance of AaBb is what?
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
Only temperature of the water bath
6.02 x 10^23 ions/mol
[A]^a[B]^b

15. The coefficient of static friction is the ratio of what?
They increase because you hear a lower frequency
1000
The force along the board to the normal force
The number of electrons emitted

16. What is Newton's Universal Law of Gravitation?
Colligative; the number of solute particles present
Add them together
F = GMm/r^2
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles

17. The coefficient of kinetic friction is always lower than what? Therefore what?
That of static friction; there is a net accelerating force on the block once it starts to slide
1) Young's Modulus 2) Shear Modulus 3) Bulk Modulus
Positron emission
It will be reduced the voltage produced by the resistor which means IR; E- IR

18. If you are given density and volume how do you find mass?
+/- 1/2
Isolating an atom from minerals by decomposing the minerals with an electric current
Polar
(density[p])(volume)

19. 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?
(+)
That they are catalysts in the rxn because they react with the substrate and are reformed
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
Yes - if the particle's trail is equidistant between two adjacent anodes

20. What would the force be of a block on a pulley? What would be its displacement?

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21. The electrons emitted from cathode are replaced with what?
Electrons from anode and battery
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
The volume of the ice cube or whatever it is
The buoyant force on it; W = mg = pVg

22. Is the work done by air resistance - positive or negative?
Negative
It has a positive oxidation potential so it is easily oxidized
Mg
T = (2h/g)^1/2; distance = vt

23. When an element decreases its atomic number by one what is emitted?
Positron because this is known as positron decay/electron capture
Energy
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
An odd number

24. What is the hybridization of oxygen in water and other oxygens similar to water with two bonds and two lone pairs of electrons?
It's weight = mg; h
Sp^3
Its intensity in the spectrum
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

25. What is the equation for work done?
W = F(displacement)
Cathode; anode
When electron falls from high energy to low energy level
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio

26. In order to increase the kinetic energy of electrons - they must be what?
Positron because this is known as positron decay/electron capture
Accelerated by a higher voltage between the cathode and anode
The number of electrons emitted
When all the external forces = zero

27. What is sublimation?
Going from solid to gas phase
Isolating an atom from minerals by decomposing the minerals with an electric current
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 path is longer on the inclined plane so it will take object longer to reach the bottom

28. Charged particles in motion constitute what? Freely moving charges are deflected by what? The curved path depends on 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
T = (2h/g)^1/2; distance = vt
Only temperature of the water bath
Liquid displaced by that object

29. Why is it important that the materials used as scintillators are nearly transparent to the wavelength of light they emit?
The nucleus gains a proton and no neutrons
The current is the same
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
Positive

30. Regarding M(OH)2 and you have solubility (S) - what would the Ksp be?
The element's mass number
Zero
1) Young's Modulus 2) Shear Modulus 3) Bulk Modulus
[S][2S]^2 = 4S^3

31. How do you find specific gravity of an object?
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
-l to +l
It decreases; the work done by the gas in expanding decreases its internal energy

32. What is weight equal to?
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
Mg
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
Voltage

33. What is the spin projection quantum number?
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
+/- 1/2
Pascal (N*m^2)
B = pVg; density

34. What kind of charge is on Al?
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
3+
It can also equal 'mg'; the compressive strength of a substance
Positron emission

35. The boiling point of a solution is what type of property? Which means is depends only on what?
Ability to locate an event in space
It will increase as well because they are directly related - only if pressure is kept constant
When you have central atom with six ions on it
Colligative; the number of solute particles present

36. Heat from friction comes from what?
H = negative and S = positive
A constant force on a mass causes it to have a constant acceleration
Decreasing potential energy
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4

37. A plane mirror produces an image where?
One that has more solute particles per liter of solution
Red
V/m or N/C
At an equal distance behind it as the object is in front of the mirror

38. Always remember that velocity has ____ and ____
Mag and direction
NO; reduction-oxidation
The lowest one
400 to 700 nm

39. What is the doppler equation for wavelength and frequency?
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting
Its momentum is zero because velocity is zero; zero because of conservation of momentum
Pascal (N*m^2)
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c

40. How do the final velocities differ if a sphere is dropped from a distance rather than rolled down an inclined plane?
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
It decreases; the work done by the gas in expanding decreases its internal energy
It's weight = mg; h
They do not differ

41. If any species is gotten rid of when combining two equations of chemical rxns together what can you conclude about those species?
Yes - if the particle's trail is equidistant between two adjacent anodes
B = pVg; density
That they are catalysts in the rxn because they react with the substrate and are reformed
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

42. The concentration of OH and H30 ions are approximately equal at what pH?
7 always!!!
When electron falls from high energy to low energy level
It can also equal 'mg'; the compressive strength of a substance
H = negative and S = positive

43. If you have longer wavelengths how is their freq and energy compared to shorter wavelengths?
Pascal (N*m^2)
1) Young's Modulus 2) Shear Modulus 3) Bulk Modulus
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)

44. What type of acid and base would produce a pH closest to 7?
The cross-sectional area through which the fluid flows
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure
Strong acid and strong base/ weak acid and weak base
Negative

45. When does red litmus paper turn blue?
F =ma and F= qE
It will increase as well because they are directly related - only if pressure is kept constant
+/- 1/2
In the presence of a base

46. if lead is successively preciptated as PbSO4 - PbI - and PbCO2 - which is less soluble than which? Thus which anions will be precipitated first?
When all the external forces = zero
Negative
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
0 Hz because they are traveling side by side at the same speed

47. What is the amt of energy that a frictional force generates?
Decreasing potential energy
Energy
Half of the exponent
Force times the distance over which the force acts

48. How do you figure out the literature Ksp value of a compound?
No - it increases the speed at which the rxn reaches that equilibrium
A saturated solution in which the aqueous ions are in equilibrium with the solid
The mass number stays the number but the atomic number decreases by one - usually resulting in another element
You look at what is being oxidized and reduced in the problem

49. Equivalent mass is what?
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
The nucleus gains a proton and no neutrons

50. What kind of metals react violently with water?
Total internal reflection
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
Alkali metals = first column