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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.
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. A nearsighted person has what type of focal length? Thus what do we do to correct this?
Helium; 4
Shorter than it should be so rays from a distant object form in front of retina; use divergent lens
L = wavelength/2 so L= (wavelength)(2)
B = pVg; density

2. What is newton's second law?
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
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)
That of static friction; there is a net accelerating force on the block once it starts to slide
A constant force on a mass causes it to have a constant acceleration

3. 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?
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
H = negative and S = positive
(+)
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure

4. Why is it important that the materials used as scintillators are nearly transparent to the wavelength of light they emit?
400 to 700 nm
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
P = F(v) = mg(v -terminal)
They must balance

5. When looking at which combo of acids and bases will result in a solution with pH of 7 what do we look for?
The number of electrons emitted
Positron because this is known as positron decay/electron capture
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
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

6. Kb is the equilibrium constant for what?
It has a positive oxidation potential so it is easily oxidized
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
They are directly proportional
The reaction between the base and water

7. What is the magnitude of the electric field produced by a point charge?
(+)
Voltage
The lowest one
E = (kq)/r^2

8. If both weight and bouyant force are dependent on g - that makes g independent of what?
The current is the same
Accelerated by a higher voltage between the cathode and anode
The volume of the ice cube or whatever it is
0 Hz because they are traveling side by side at the same speed

9. What is the magnetic quantum number?
When HIn is turned into In- - which is dependent upon the pKa of the indicator
One mole of electric charge
Strong acid and strong base/ weak acid and weak base
-l to +l

10. Heat from friction comes from what?
The density of the water and volume of the lead object
Going from solid to gas phase
Decreasing potential energy
B = pVg; density

11. What kind of metals react violently with water?
It will increase as well because they are directly related - only if pressure is kept constant
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
Alkali metals = first column
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c

12. 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?
The mass number stays the number but the atomic number decreases by one - usually resulting in another element
The density of the water and volume of the lead object
The element's mass number
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

13. Terminal voltage is provided to what?
External components of the circuit
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
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure
That of static friction; there is a net accelerating force on the block once it starts to slide

14. The visible spectrum ranges from ____ to _____
[A]^a[B]^b
400 to 700 nm
Liquid displaced by that object
P = F(v) = mg(v -terminal)

15. The free energy change (G) must be negative when what?
Cathode; anode
H = negative and S = positive
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
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors

16. If temperature arises during a mixture what can you conclude about the enthalpy?
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's weight = mg; h
That it is negative
7 always!!!

17. What is the amt of energy that a frictional force generates?
V/m or N/C
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces
Force times the distance over which the force acts
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

18. The coefficient of static friction is the ratio of what?
You look at what is being oxidized and reduced in the problem
Going from solid to gas phase
The force along the board to the normal force
They must balance

19. If you have circuit elements in parallel what is the same across them?
Voltage
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
(+)
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant

20. When is a body in translational equilibrium?
When all the external forces = zero
Total internal reflection
P = F(v) = mg(v -terminal)
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

21. 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
The cross-sectional area through which the fluid flows
Only temperature of the water bath
Mv = mv

22. What kind of geometry is octahedral?
The cross-sectional area through which the fluid flows
When you have central atom with six ions on it
In the presence of a base
The lowest whole number ratio of moles of each element in a mole of a cmpd

23. 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?
P = F(v) = mg(v -terminal)
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
Where an event took place
The density of the water and volume of the lead object

24. Equivalent mass is what?
Only temperature of the water bath
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
The lowest one
T = 2pi/angular velocity; v/r

25. When a falling mass is at terminal speed - what is the power expended by the air resistance?
Electrons from anode and battery
The cross-sectional area through which the fluid flows
P = F(v) = mg(v -terminal)
Positron emission

26. In general what is formed by an acid-base rxn?
A salt and water
Voltage
Shorter than it should be so rays from a distant object form in front of retina; use divergent lens
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

27. The range of pH in which a color change takes place in a titration depends on what?
When HIn is turned into In- - which is dependent upon the pKa of the indicator
A constant force on a mass causes it to have a constant acceleration
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

28. What is the equation for bouyant force? What is p?
Liquid displaced by that object
B = pVg; density
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
Its twice that distance

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

30. How do you figure out the literature Ksp value of a compound?
A saturated solution in which the aqueous ions are in equilibrium with the solid
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
The mass number stays the number but the atomic number decreases by one - usually resulting in another element
Ability to locate an event in space

31. Nuclear masses can be approximated from what?

32. Strength of dispersion force increases with what?
The force along the board to the normal force
Going from solid to gas phase
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
Ease of polarizability of the molecule and thus increasing molecular weight of mass

33. Is the work done by air resistance - positive or negative?
Positive
Negative
No - it increases the speed at which the rxn reaches that equilibrium
0 Hz because they are traveling side by side at the same speed

34. If asked which electron configuration of an element is most stable which one do you choose?
The regular one
+/- 1/2
B = pVg; density
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

35. If any species is gotten rid of when combining two equations of chemical rxns together what can you conclude about those species?
F = GMm/r^2
Its twice that distance
You look at what is being oxidized and reduced in the problem
That they are catalysts in the rxn because they react with the substrate and are reformed

36. Half-sine wave shape is what kind of wavelength with regards to length?
A positron or electron; when atomic number goes up you know an electron has been emitted
L = wavelength/2 so L= (wavelength)(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
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

37. In PV=nRT - if temp increases what will happen to volume?
It will increase as well because they are directly related - only if pressure is kept constant
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c
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)
They increase because you hear a lower frequency

38. Light can be carried along a distance within a transparent material by means of what?
7 always!!!
Total internal reflection
400 to 700 nm
Neutrons; atomic number

39. When an element decreases its atomic number by one what is emitted?
Positron because this is known as positron decay/electron capture
It decreases; the work done by the gas in expanding decreases its internal energy
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)
Positive

40. How do you find what is the limiting reagent? You can then use the moles of the limiting reagent to calculate what?
At an equal distance behind it as the object is in front of the mirror
Electron shell number
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
It's weight = mg; h

41. What gas is evolved when copper is placed in a nitric acid (HNO3) solution? This is what type of rxn?
A saturated solution in which the aqueous ions are in equilibrium with the solid
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
NO; reduction-oxidation
The particle's charge and the magnitude of the electric field

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

43. How many mL is in one liter?
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
In the presence of a base
1) Young's Modulus 2) Shear Modulus 3) Bulk Modulus
1000

44. What is the formula for the power supplied by a battery to accelerate an electron beam?
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)
P = IV
One that has more solute particles per liter of solution
Shorter than it should be so rays from a distant object form in front of retina; use divergent lens

45. Always remember that velocity has ____ and ____
Ability to locate an event in space
Mag and direction
They are directly proportional
+/- 1/2

46. Melting occurs at what type of temperature? Why?
H has a small atomic radius
You look at what is being oxidized and reduced in the problem
(+)
Constant to overcome the heat of fusion (solid to liquid state)

47. The equivalence pt is what part of the titration curve? Thus looking at the range of change between the pH values along this part of the graph can tell you what?

48. 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?
P = IV
When HIn is turned into In- - which is dependent upon the pKa of the indicator
It has a positive oxidation potential so it is easily oxidized
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

49. What does the empirical formula show?
The lowest whole number ratio of moles of each element in a mole of a cmpd
3+
It will be reduced the voltage produced by the resistor which means IR; E- IR
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect

50. The number of incident photons on the cathode affect what?
An odd number
It will increase as well because they are directly related - only if pressure is kept constant
The number of electrons emitted
[A]^a[B]^b