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DSST Physical Sciences2

Subjects : dsst, science

Instructions:

Answer 50 questions in 15 minutes.
If you are not ready to take this test, you can study here.
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. 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?
Alkali metals = first column
The density of the water and volume of the lead object
From peak to peak
Half of the exponent

2. What energy conversion describes best what takes place in a battery-powered resistive circuit?
Add them together
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
They do not differ
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

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

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4. Heat from friction comes from what?
Sp^3
At an equal distance behind it as the object is in front of the mirror
Red
Decreasing potential energy

5. What happens to a negatively charged particle put between two parallel plates?
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio
It experiences a constant electric force of qE and will thus accelerate towards the positive plate
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles
It will increase as well because they are directly related - only if pressure is kept constant

6. If you have circuit elements in parallel what is the same across them?
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles
Voltage
When HIn is turned into In- - which is dependent upon the pKa of the indicator
It's weight = mg; h

7. Kb is the equilibrium constant for what?
Faraday/electrons
A saturated solution in which the aqueous ions are in equilibrium with the solid
The reaction between the base and water
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

8. What direction do gravity and bouyancy work? What direction does water pressure work?
Vertically; perpendicular to all surfaces
B = pVg; density
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)
Isolating an atom from minerals by decomposing the minerals with an electric current

9. What is the equation for a period (T)? What is the equation for angular velocity?
A saturated solution in which the aqueous ions are in equilibrium with the solid
T = 2pi/angular velocity; v/r
Add them together
Constant to overcome the heat of fusion (solid to liquid state)

10. When you are trying to calculate a galvanic cell's emf - what do you look at?
It can absorb light that lets other electrons fill those orbitals
1000
You look at what is being oxidized and reduced in the problem
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

11. Young's modulus is a ________ for a material. What is it's ratio? What would a graph of it look like?
It has a positive oxidation potential so it is easily oxidized
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant
3+
The lowest one

12. Terminal voltage is provided to what?
Neutrons; atomic number
Alkali metals = first column
In the presence of a base
External components of the circuit

13. When does red litmus paper turn blue?
T = 2pi/angular velocity; v/r
They must balance
In the presence of a base
A constant force on a mass causes it to have a constant acceleration

14. What is conserved in an inellastic collision?
Red
The density of the water and volume of the lead object
Momentum
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous

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

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16. What is the hybridization of oxygen in water and other oxygens similar to water with two bonds and two lone pairs of electrons?
H = negative and S = positive
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
Sp^3
A salt and water

17. What is the principal quantum number (n)?
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles
Electron shell number
They are directly proportional
Electrons from anode and battery

18. Always remember that velocity has ____ and ____
The element's mass number
Going from solid to gas phase
Mag and direction
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2

19. What does specific heat of a substance tell you? Thus what does a higher specific heat tell you?
That they are catalysts in the rxn because they react with the substrate and are reformed
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
L = wavelength/2 so L= (wavelength)(2)
1) Young's Modulus 2) Shear Modulus 3) Bulk Modulus

20. When an element decreases its atomic number by one what is emitted?
Where an event took place
Positron because this is known as positron decay/electron capture
It will be reduced the voltage produced by the resistor which means IR; E- IR
Positron emission

21. if lead is successively preciptated as PbSO4 - PbI - and PbCO2 - which is less soluble than which? Thus which anions will be precipitated first?
(+)
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
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
E = (kq)/r^2

22. Strength of dispersion force increases with what?
The particle's charge and the magnitude of the electric field
The reaction between the base and water
No - it increases the speed at which the rxn reaches that equilibrium
Ease of polarizability of the molecule and thus increasing molecular weight of mass

23. What is the spin projection quantum number?
Strong acid and strong base/ weak acid and weak base
One that has more solute particles per liter of solution
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
+/- 1/2

24. What is the net result on a nucleus when you absorb a deuturon and emit a neutron?
Electron shell number
The nucleus gains a proton and no neutrons
Mass number stays the same but the atomic number increases
The density of the water and volume of the lead object

25. How do you find length of time something is in flight? How do you find distance it traveled?
B = pVg; density
T = (2h/g)^1/2; distance = vt
External components of the circuit
The force along the board to the normal force

26. How do you balance redox rxns?

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27. Does the temperature of a water bath or amount of water in a water bath determines if a substance melts?
Its twice that distance
Positron because this is known as positron decay/electron capture
Only temperature of the water bath
Mass number stays the same but the atomic number increases

28. The force on an electrical charge is what?
180 degrees; when there is half a wave distance in phase between two waves
Pascal (N*m^2)
400 to 700 nm
F =ma and F= qE

29. When looking at which combo of acids and bases will result in a solution with pH of 7 what do we look for?
Isolating an atom from minerals by decomposing the minerals with an electric current
The particle's charge and the magnitude of the electric field
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors

30. What is the law of conservation of linear momentum?
A saturated solution in which the aqueous ions are in equilibrium with the solid
The force along the board to the normal force
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
Mv = mv

31. What is the formula for the power supplied by a battery to accelerate an electron beam?
P = IV
Mag and direction
[S][2S]^2 = 4S^3
That of static friction; there is a net accelerating force on the block once it starts to slide

32. Nuclear masses can be approximated from what?

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33. Equivalent mass is what?
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio
Electron shell number
Cathode; anode
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

34. The free energy change (G) must be negative when what?
It's weight = mg; the work would be the weight times the distance fell
Colligative: it depends on the number of solute molecules in a given volume of water
L = wavelength/2 so L= (wavelength)(2)
H = negative and S = positive

35. The basicity constant Kb measures what?
Mv = mv
How strong a base is
The nucleus gains a proton and no neutrons
Going from solid to gas phase

36. When the source of a sound is flying away from you what happens to the wavelengths from peak to peak?
H = negative and S = positive
They increase because you hear a lower frequency
One mole of electric charge
It experiences a constant electric force of qE and will thus accelerate towards the positive plate

37. What is the relationship between P and n in PV=nRT?
They are directly proportional
The path is longer on the inclined plane so it will take object longer to reach the bottom
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 lowest amt than any of the other cmpds with a higher carbon to oxygen ratio

38. Pressure in a liquid is proportional to what? So why does this explain why blood pressure is greater in legs?
Decreasing potential energy
Energy
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
A saturated solution in which the aqueous ions are in equilibrium with the solid

39. If something is very toxic to a human - what Ksp value should it have for it to be the safest?
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous
Vertically; perpendicular to all surfaces
That of static friction; there is a net accelerating force on the block once it starts to slide
The lowest one

40. How do you find wavelength if you known distance from adjacent crests and troughs?
Its twice that distance
Force times the distance over which the force acts
It will be reduced the voltage produced by the resistor which means IR; E- IR
V/m or N/C

41. Hydrogen has what kind of standard oxidation or reduction potential?
Zero
Ability to locate an event in space
One mole of electric charge
B = pVg; density

42. What kind of charge is on Al?
3+
Ability to locate an event in space
The element's mass number
Positron because this is known as positron decay/electron capture

43. When is a body in translational equilibrium?
Colligative; the number of solute particles present
When all the external forces = zero
Only temperature of the water bath
An odd number

44. The coefficient of kinetic friction is always lower than what? Therefore what?
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
That of static friction; there is a net accelerating force on the block once it starts to slide
The cross-sectional area through which the fluid flows
-l to +l

45. Why is it important that the materials used as scintillators are nearly transparent to the wavelength of light they emit?
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
400 to 700 nm
It experiences a constant electric force of qE and will thus accelerate towards the positive plate
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

46. Why would a solution with unfilled orbitals be responsible for turning a solution a certian color?
Ability to locate an event in space
180 degrees; when there is half a wave distance in phase between two waves
It can absorb light that lets other electrons fill those orbitals
That they are catalysts in the rxn because they react with the substrate and are reformed

47. Beta decay is the same as what?
Total internal reflection
It decreases; the work done by the gas in expanding decreases its internal energy
Positron emission
The regular one

48. The volume of an object is equal to water?
1000
Liquid displaced by that object
Colligative: it depends on the number of solute molecules in a given volume of water
External components of the circuit

49. In Bohr model of atom when is energy emitted?
Negative
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
When electron falls from high energy to low energy level

50. What is the magnetic quantum number?
-l to +l
B = pVg; density
Yes - if the particle's trail is equidistant between two adjacent anodes
E = (kq)/r^2