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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. The concentration of OH and H30 ions are approximately equal at what pH?
7 always!!!
B = pVg; density
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
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

2. Beta decay is the emission of what? How do you know what it is the emission of?
180 degrees; when there is half a wave distance in phase between two waves
A positron or electron; when atomic number goes up you know an electron has been emitted
A saturated solution in which the aqueous ions are in equilibrium with the solid
The current is the same

3. What is the equation for work done?
W = F(displacement)
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
Its momentum is zero because velocity is zero; zero because of conservation of momentum
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c

4. What is the formula for the power supplied by a battery to accelerate an electron beam?
P = IV
L = wavelength/2 so L= (wavelength)(2)
T = 2pi/angular velocity; v/r
The force along the board to the normal force

5. Pressure in a liquid is proportional to what? So why does this explain why blood pressure is greater in legs?
F = GMm/r^2
(+)
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
One mole of electric charge

6. Why does light travel slower in an optically dense medium than through a vacuum?
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
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
P = F(v) = mg(v -terminal)
F =ma and F= qE

7. What is usually conserved over oscillation periods?
Energy
(density[p])(volume)
They must balance
F =ma and F= qE

8. What does spatial resolution refer to?
Ability to locate an event in space
The current is the same
They do not differ
Vertically; perpendicular to all surfaces

9. For a given flow rate - the speed of fluid flow is inversely proportional to what?
Positron because this is known as positron decay/electron capture
It decreases; the work done by the gas in expanding decreases its internal energy
W = F(displacement)
The cross-sectional area through which the fluid flows

10. if lead is successively preciptated as PbSO4 - PbI - and PbCO2 - which is less soluble than which? Thus which anions will be precipitated first?
The lowest whole number ratio of moles of each element in a mole of a cmpd
You look at what is being oxidized and reduced in the problem
400 to 700 nm
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4

11. Why is it important that the materials used as scintillators are nearly transparent to the wavelength of light they emit?
Yes - if the particle's trail is equidistant between two adjacent anodes
In the presence of a base
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
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

12. The number of incident photons on the cathode affect what?
External components of the circuit
Where an event took place
1) Young's Modulus 2) Shear Modulus 3) Bulk Modulus
The number of electrons emitted

13. In general what is formed by an acid-base rxn?
Decreasing potential energy
Sp^3
[S][2S]^2 = 4S^3
A salt and water

14. A cmpd with the lowest carbon to oxygen ratio will require how much oxygen for combustion?
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
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
Voltage
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio

15. If you are given density and volume how do you find mass?
The path is longer on the inclined plane so it will take object longer to reach the bottom
(density[p])(volume)
(+)
How strong a base is

16. What happens if an atom undergoes positron decay or electron capture?
Positron emission
7 always!!!
Ease of polarizability of the molecule and thus increasing molecular weight of mass
The mass number stays the number but the atomic number decreases by one - usually resulting in another element

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

18. Melting occurs at what type of temperature? Why?
Polar
Constant to overcome the heat of fusion (solid to liquid state)
Isolating an atom from minerals by decomposing the minerals with an electric current
W = F(displacement)

19. What is one faraday equal to?
One mole of electric charge
It's weight = mg; the work would be the weight times the distance fell
P = IV
That of static friction; there is a net accelerating force on the block once it starts to slide

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

21. What is newton's second law?
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
A constant force on a mass causes it to have a constant acceleration
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed

22. In order to guarantee a non-zero spin how many electrons are needed?
They must balance
Mg
An odd number
T = 2pi/angular velocity; v/r

23. What color is above 656 nm?
A salt and water
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect
Red

24. The basicity constant Kb measures what?
How strong a base is
B = pVg; density
Its intensity in the spectrum
Sp^3

25. How many mL is in one liter?
When electron falls from high energy to low energy level
Add them together
1000
A saturated solution in which the aqueous ions are in equilibrium with the solid

26. What is sublimation?
Energy
-l to +l
T = 2pi/angular velocity; v/r
Going from solid to gas phase

27. When you are trying to calculate a galvanic cell's emf - what do you look at?
The path is longer on the inclined plane so it will take object longer to reach the bottom
No - it increases the speed at which the rxn reaches that equilibrium
You look at what is being oxidized and reduced in the problem
Total internal reflection

28. The range of pH in which a color change takes place in a titration depends on what?
A constant force on a mass causes it to have a constant acceleration
Attractive molecular forces acting between material surfaces in contact
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
When HIn is turned into In- - which is dependent upon the pKa of the indicator

29. What is Newton's Universal Law of Gravitation?
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio
Alkali metals = first column
They do not differ
F = GMm/r^2

30. What is the magnetic quantum number?
W = F(displacement)
-l to +l
Add them together
Its momentum is zero because velocity is zero; zero because of conservation of momentum

31. How do you find what is the limiting reagent? You can then use the moles of the limiting reagent to calculate what?
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
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
Density (gravitational constant) 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

32. The force on an electrical charge is what?
F =ma and F= qE
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
Shorter than it should be so rays from a distant object form in front of retina; use divergent lens
The current is the same

33. Terminal voltage is provided to what?
The force along the board to the normal force
That of static friction; there is a net accelerating force on the block once it starts to slide
T = 2pi/angular velocity; v/r
External components of the circuit

34. What happens to the atomic number and atomic mass of an element that go under Beta decay or positron emission?
Colligative; the number of solute particles present
Mass number stays the same but the atomic number increases
P = IV
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

35. Acetic acid is a ______ solvent
Polar
When you have central atom with six ions on it
One that has more solute particles per liter of solution
Red

36. The volume of an object is equal to water?
Liquid displaced by that object
The nucleus gains a proton and no neutrons
The buoyant force on it; W = mg = pVg
Strong acid and strong base/ weak acid and weak base

37. Thus is Zn (which has positive oxidation potential) reacts with HCl - will any rxn take place?
How strong a base is
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R

38. What is conserved in an inellastic collision?
That of static friction; there is a net accelerating force on the block once it starts to slide
Momentum
It experiences a constant electric force of qE and will thus accelerate towards the positive plate
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous

39. If both weight and bouyant force are dependent on g - that makes g independent of what?
The density of the water and volume of the lead object
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
Constant to overcome the heat of fusion (solid to liquid state)
The volume of the ice cube or whatever it is

40. 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?
(+)
You look at what is being oxidized and reduced in the problem
B = pVg; density
Going from solid to gas phase

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?
The element's mass number
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
H has a small atomic radius
That of static friction; there is a net accelerating force on the block once it starts to slide

42. 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
It can also equal 'mg'; the compressive strength of a substance
Electron shell number
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

43. 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?
The reaction between the base and water
When HIn is turned into In- - which is dependent upon the pKa of the indicator
Ability to locate an event in space
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

44. If you are told to find the maximum number of NiCo3 that can form how do you do that?

45. If temperature arises during a mixture what can you conclude about the enthalpy?
180 degrees; when there is half a wave distance in phase between two waves
No - it increases the speed at which the rxn reaches that equilibrium
The number of electrons emitted
That it is negative

46. How do you find wavelength if you known distance from adjacent crests and troughs?
It can absorb light that lets other electrons fill those orbitals
When electron falls from high energy to low energy level
External components of the circuit
Its twice that distance

47. How should the period of a waveform be calculated?
Density (gravitational constant) height
From peak to peak
F = GMm/r^2
The current is the same

48. What is the principal quantum number (n)?
V/m or N/C
The reaction between the base and water
Energy
Electron shell number

49. A plane mirror produces an image where?
400 to 700 nm
The regular one
At an equal distance behind it as the object is in front of the mirror
The current is the same

50. What gas is evolved when copper is placed in a nitric acid (HNO3) solution? This is what type of rxn?
When all the external forces = zero
It can absorb light that lets other electrons fill those orbitals
NO; reduction-oxidation
[A]^a[B]^b