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DSST Physical Sciences2

Subjects : dsst, science

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Answer 50 questions in 15 minutes.
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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. In radioactive decay the atomic number (A) and mass number (Z) must what?
The number of electrons emitted
The volume of the ice cube or whatever it is
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
They must balance

2. 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 cross-sectional area through which the fluid flows
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure
That they are catalysts in the rxn because they react with the substrate and are reformed

3. What is the law of conservation of linear momentum?
Going from solid to gas phase
Mv = mv
The cross-sectional area through which the fluid flows
400 to 700 nm

4. Beta decay is the same as what?
180 degrees; when there is half a wave distance in phase between two waves
Positron emission
400 to 700 nm
F = GMm/r^2

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?
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
It has a positive oxidation potential so it is easily oxidized
From peak to peak
When electron falls from high energy to low energy level

6. An oxidation-reduction rxn that occurs spontaneously has what kind of E^o for the cell?
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
P = IV
Positive
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

7. The phase difference corresponding to a half wave is what? When do you get destructive interference?
Alkali metals = first column
180 degrees; when there is half a wave distance in phase between two waves
(+)
When electron falls from high energy to low energy level

8. The electrons emitted from cathode are replaced with what?
Momentum
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
F = GMm/r^2
Electrons from anode and battery

9. Is the work done by air resistance - positive or negative?
It can absorb light that lets other electrons fill those orbitals
Negative
Half of the exponent
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

10. How many mL is in one liter?
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
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 path is longer on the inclined plane so it will take object longer to reach the bottom
1000

11. How do you balance redox rxns?

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12. What happens to a negatively charged particle put between two parallel plates?
Strong acid and strong base/ weak acid and weak base
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
Going from solid to gas phase
It experiences a constant electric force of qE and will thus accelerate towards the positive plate

13. An alpha particle can also be assumed to be what element? What is the mass number of Helium?
-l to +l
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces
Helium; 4
Vertically; perpendicular to all surfaces

14. Neither N2 or O2 have a permanent what? What does this mean?
The lowest one
A saturated solution in which the aqueous ions are in equilibrium with the solid
Electron shell number
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces

15. The range of pH in which a color change takes place in a titration depends on what?
It's weight = mg; h
When HIn is turned into In- - which is dependent upon the pKa of the indicator
Density (gravitational constant) height
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water

16. What is the relationship between P and n in PV=nRT?
They are directly proportional
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)
When you have central atom with six ions on it
You look at what is being oxidized and reduced in the problem

17. What is the equation for work done?
Force times the distance over which the force acts
W = F(displacement)
Electron shell number
T = 2pi/angular velocity; v/r

18. Why is it important that the materials used as scintillators are nearly transparent to the wavelength of light they emit?
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
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
W = F(displacement)
The particle's charge and the magnitude of the electric field

19. The basicity constant Kb measures what?
Where an event took place
Positron emission
Isolating an atom from minerals by decomposing the minerals with an electric current
How strong a base is

20. What is different between an inclined plane and free fall?
When all the external forces = zero
The cross-sectional area through which the fluid flows
The path is longer on the inclined plane so it will take object longer to reach the bottom
They must balance

21. What is Newton's Universal Law of Gravitation?
One that has more solute particles per liter of solution
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
F = GMm/r^2
A saturated solution in which the aqueous ions are in equilibrium with the solid

22. How do you find specific gravity of an object?
Where an event took place
B = pVg; density
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
[S][2S]^2 = 4S^3

23. The temperature of a metal will not increase above its melting point until what?
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting
Electrons from anode and battery
[S][2S]^2 = 4S^3
When you have central atom with six ions on it

24. What does the empirical formula show?
Electron shell number
They are directly proportional
Cathode; anode
The lowest whole number ratio of moles of each element in a mole of a cmpd

25. Charged particles in motion constitute what? Freely moving charges are deflected by what? The curved path depends on what?
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
In the presence of a base
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

26. What energy conversion describes best what takes place in a battery-powered resistive circuit?
E = (kq)/r^2
Its momentum is zero because velocity is zero; zero because of conservation of momentum
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
Mg

27. A nearsighted person has what type of focal length? Thus what do we do to correct this?
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
They increase because you hear a lower frequency
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
Shorter than it should be so rays from a distant object form in front of retina; use divergent lens

28. Friction is caused by what?
Force times the distance over which the force acts
[A]^a[B]^b
Attractive molecular forces acting between material surfaces in contact
A saturated solution in which the aqueous ions are in equilibrium with the solid

29. When you are trying to calculate a galvanic cell's emf - what do you look at?
You look at what is being oxidized and reduced in the problem
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
In the presence of a base
Cathode; anode

30. How do the final velocities differ if a sphere is dropped from a distance rather than rolled down an inclined plane?
0 Hz because they are traveling side by side at the same speed
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
Pascal (N*m^2)
They do not differ

31. The concentration of OH and H30 ions are approximately equal at what pH?
7 always!!!
It will be reduced the voltage produced by the resistor which means IR; E- IR
Helium; 4
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c

32. As a balloon rises in a tank of water what happens to the temperature inside it? Why would this happen?
Momentum
It decreases; the work done by the gas in expanding decreases its internal energy
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure
T = 2pi/angular velocity; v/r

33. In order to guarantee a non-zero spin how many electrons are needed?
It's weight = mg; h
An odd number
Going from solid to gas phase
Pascal (N*m^2)

34. 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?
Positive
(+)
Strong acid and strong base/ weak acid and weak base
Positron because this is known as positron decay/electron capture

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

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36. What kind of geometry is octahedral?
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
A positron or electron; when atomic number goes up you know an electron has been emitted
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect
When you have central atom with six ions on it

37. Thus is Zn (which has positive oxidation potential) reacts with HCl - will any rxn take place?
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
That it is negative
Positron emission
Colligative; the number of solute particles present

38. What does spatial resolution refer to?
It's weight = mg; h
Ability to locate an event in space
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
Sp^3

39. Why are bonds between H and another atom shorter compared to most?
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
Positron because this is known as positron decay/electron capture
H has a small atomic radius
Pascal (N*m^2)

40. Can a charged particle be detected by two anodes?

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41. Terminal voltage is provided to what?
External components of the circuit
One mole of electric charge
Ease of polarizability of the molecule and thus increasing molecular weight of mass
Add them together

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

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43. What does specific heat of a substance tell you? Thus what does a higher specific heat tell you?
Pascal (N*m^2)
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
Faraday/electrons
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect

44. Why does light travel slower in an optically dense medium than through a vacuum?
It can also equal 'mg'; the compressive strength of a substance
Colligative: it depends on the number of solute molecules in a given volume of water
(+)
Light is absorbed and re-emitted by the atomic structure of the optically dense medium

45. What is the equation for bouyant force? What is p?
The reaction between the base and water
B = pVg; density
The buoyant force on it; W = mg = pVg
Where an event took place

46. Equivalent mass is what?
In the presence of a base
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
They are directly proportional
It will be reduced the voltage produced by the resistor which means IR; E- IR

47. What is the hybridization of oxygen in water and other oxygens similar to water with two bonds and two lone pairs of electrons?
Sp^3
Only temperature of the water bath
A positron or electron; when atomic number goes up you know an electron has been emitted
Attractive molecular forces acting between material surfaces in contact

48. A pendulum moves under the influence of what?
V/m or N/C
Gravity
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant
L = wavelength/2 so L= (wavelength)(2)

49. What is sublimation?
It has a positive oxidation potential so it is easily oxidized
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
[A]^a[B]^b
Going from solid to gas phase

50. Can a catalyst shift equilibrium?
No - it increases the speed at which the rxn reaches that equilibrium
The mass number stays the number but the atomic number decreases by one - usually resulting in another element
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
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

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DSST Physical Sciences2

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