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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. If you have circuit elements in parallel what is the same across them?
The current is the same
Voltage
It can also equal 'mg'; the compressive strength of a substance
1) Young's Modulus 2) Shear Modulus 3) Bulk Modulus

2. Half-sine wave shape is what kind of wavelength with regards to length?
Voltage
L = wavelength/2 so L= (wavelength)(2)
One that has more solute particles per liter of solution
(density[p])(volume)

3. In order to increase the kinetic energy of electrons - they must be what?
Polar
6.02 x 10^23 ions/mol
The density of the water and volume of the lead object
Accelerated by a higher voltage between the cathode and anode

4. What do electrolytic techniques involve?
Its twice that distance
Cathode; anode
Isolating an atom from minerals by decomposing the minerals with an electric current
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

5. When an element decreases its atomic number by one what is emitted?
Energy
Vertically; perpendicular to all surfaces
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
Positron because this is known as positron decay/electron capture

6. Kb is the equilibrium constant for what?
The reaction between the base and water
From peak to peak
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous
Attractive molecular forces acting between material surfaces in contact

7. In order to guarantee a non-zero spin how many electrons are needed?
An odd number
Mg
Decreasing potential energy
The particle's charge and the magnitude of the electric field

8. What does the empirical formula show?
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting
A saturated solution in which the aqueous ions are in equilibrium with the solid
Constant to overcome the heat of fusion (solid to liquid state)
The lowest whole number ratio of moles of each element in a mole of a cmpd

9. Why are bonds between H and another atom shorter compared to most?
1) Young's Modulus 2) Shear Modulus 3) Bulk Modulus
Accelerated by a higher voltage between the cathode and anode
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
H has a small atomic radius

10. The square root of 10^anything is equal to what?
Half of the exponent
H = negative and S = positive
Its intensity in the spectrum
A saturated solution in which the aqueous ions are in equilibrium with the solid

11. Hydrogen has what kind of standard oxidation or reduction potential?
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)
Half of the exponent
The nucleus gains a proton and no neutrons
Zero

12. 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?
Going from solid to gas phase
T = 2pi/angular velocity; v/r
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

13. Beta decay is the same as what?
Mag and direction
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure
Going from solid to gas phase
Positron emission

14. Pressure in a liquid is proportional to what? So why does this explain why blood pressure is greater in legs?
It experiences a constant electric force of qE and will thus accelerate towards the positive plate
Pascal (N*m^2)
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)

15. Why is it important that the materials used as scintillators are nearly transparent to the wavelength of light they emit?
Ability to locate an event in space
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
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous
One mole of electric charge

16. How do you find specific gravity of an object?
At an equal distance behind it as the object is in front of the mirror
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
T = 2pi/angular velocity; v/r

17. The concentration of OH and H30 ions are approximately equal at what pH?
T = (2h/g)^1/2; distance = vt
7 always!!!
Its twice that distance
They are directly proportional

18. A pendulum moves under the influence of what?
One that has more solute particles per liter of solution
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
Gravity
H has a small atomic radius

19. A cmpd with the lowest carbon to oxygen ratio will require how much oxygen for combustion?
1) Young's Modulus 2) Shear Modulus 3) Bulk Modulus
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio
When all the external forces = zero
180 degrees; when there is half a wave distance in phase between two waves

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

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21. What kind of charge is on Al?
Where an event took place
3+
It can absorb light that lets other electrons fill those orbitals
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)

22. How do you find 'g' from Newton's law of gravity?
Mv = mv
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
F = GMm/r^2

23. In a rxn - how do you figure out which atom has the highest electron affinity?
Sp^3
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
Energy
Mass number stays the same but the atomic number increases

24. 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?
H = negative and S = positive
It will be reduced the voltage produced by the resistor which means IR; E- IR
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
At an equal distance behind it as the object is in front of the mirror

25. The coefficient of static friction is the ratio of what?
The force along the board to the normal force
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
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 lowest whole number ratio of moles of each element in a mole of a cmpd

26. The Ksp for a substance of AaBb is what?
H has a small atomic radius
They are directly proportional
It will increase as well because they are directly related - only if pressure is kept constant
[A]^a[B]^b

27. The phase difference corresponding to a half wave is what? When do you get destructive interference?
180 degrees; when there is half a wave distance in phase between two waves
Mass number stays the same but the atomic number increases
It will be reduced the voltage produced by the resistor which means IR; E- IR
When all the external forces = zero

28. What is the magnitude of the electric field produced by a point charge?
E = (kq)/r^2
Polar
Liquid displaced by that object
It will be reduced the voltage produced by the resistor which means IR; E- IR

29. Melting occurs at what type of temperature? Why?
External components of the circuit
Constant to overcome the heat of fusion (solid to liquid state)
E = (kq)/r^2
Light is absorbed and re-emitted by the atomic structure of the optically dense medium

30. What color is above 656 nm?
The current is the same
It will increase as well because they are directly related - only if pressure is kept constant
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure
Red

31. A floating ice cube implies that it's weight is balanced by what?
The buoyant force on it; W = mg = pVg
The current is the same
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous
The density of the water and volume of the lead object

32. Light can be carried along a distance within a transparent material by means of what?
Total internal reflection
Positron emission
They must balance
The current is the same

33. What is weight equal to?
Cathode; anode
Mg
Accelerated by a higher voltage between the cathode and anode
The nucleus gains a proton and no neutrons

34. How do you find moles of a substance when you are given faradays and electrons?
Faraday/electrons
It can absorb light that lets other electrons fill those orbitals
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
Add them together

35. What is conserved in an inellastic collision?
B = pVg; density
V/m or N/C
Momentum
The cross-sectional area through which the fluid flows

36. Strength of dispersion force increases with what?
0 Hz because they are traveling side by side at the same speed
That they are catalysts in the rxn because they react with the substrate and are reformed
Ease of polarizability of the molecule and thus increasing molecular weight of mass
It will increase as well because they are directly related - only if pressure is kept constant

37. 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
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
Electrons from anode and battery

38. When looking at which combo of acids and bases will result in a solution with pH of 7 what do we look for?
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
Half of the exponent
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
Energy

39. When a falling mass is at terminal speed - what is the power expended by the air resistance?
-l to +l
Its twice that distance
Energy
P = F(v) = mg(v -terminal)

40. What is the equation for work done?
They must balance
T = (2h/g)^1/2; distance = vt
W = F(displacement)
It will be reduced the voltage produced by the resistor which means IR; E- IR

41. The free energy change (G) must be negative when what?
Momentum
Vertically; perpendicular to all surfaces
Total internal reflection
H = negative and S = positive

42. What happens if an atom undergoes positron decay or electron capture?
The mass number stays the number but the atomic number decreases by one - usually resulting in another element
P = IV
Mg
From peak to peak

43. How do you find wavelength if you known distance from adjacent crests and troughs?
(+)
Red
Its twice that distance
Where an event took place

44. Young's modulus is a ________ for a material. What is it's ratio? What would a graph of it look like?
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 buoyant force on it; W = mg = pVg
T = (2h/g)^1/2; distance = vt
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant

45. The force on an electrical charge is what?
[S][2S]^2 = 4S^3
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
F =ma and F= qE
Ability to locate an event in space

46. If both weight and bouyant force are dependent on g - that makes g independent of what?
When all the external forces = zero
They increase because you hear a lower frequency
Positron emission
The volume of the ice cube or whatever it is

47. If you have a decrease of pressure to which side of the equation is it equilibrium shifted towards? What about if you increase temperature?

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48. Always remember that velocity has ____ and ____
Mag and direction
The mass number stays the number but the atomic number decreases by one - usually resulting in another element
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles

49. Does the temperature of a water bath or amount of water in a water bath determines if a substance melts?
Positive
Only temperature of the water bath
P = F(v) = mg(v -terminal)
They are directly proportional

50. What kind of geometry is octahedral?
It will increase as well because they are directly related - only if pressure is kept constant
They are directly proportional
When you have central atom with six ions on it
Mg