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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. 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?
(+)
Strong acid and strong base/ weak acid and weak base
Helium; 4
Energy

2. A floating ice cube implies that it's weight is balanced by what?
External components of the circuit
The buoyant force on it; W = mg = pVg
It decreases; the work done by the gas in expanding decreases its internal energy
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

3. A pendulum moves under the influence of what?
(+)
Gravity
Strong acid and strong base/ weak acid and weak base
Voltage

4. Why would a solution with unfilled orbitals be responsible for turning a solution a certian color?
Sp^3
It can absorb light that lets other electrons fill those orbitals
The density of the water and volume of the lead object
When all the external forces = zero

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

6. How do you find the equiv capacitance of capacitors in series and parallel? What about if you are trying to find equivalent resistance?
B = pVg; density
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
A saturated solution in which the aqueous ions are in equilibrium with the solid
NO; reduction-oxidation

7. The force on an electrical charge is what?
Its momentum is zero because velocity is zero; zero because of conservation of momentum
F =ma and F= qE
That of static friction; there is a net accelerating force on the block once it starts to slide
Positron emission

8. A nearsighted person has what type of focal length? Thus what do we do to correct this?
Positron because this is known as positron decay/electron capture
That they are catalysts in the rxn because they react with the substrate and are reformed
E = (kq)/r^2
Shorter than it should be so rays from a distant object form in front of retina; use divergent lens

9. What is the spin projection quantum number?
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 saturated solution in which the aqueous ions are in equilibrium with the solid
+/- 1/2
Momentum

10. Light can be carried along a distance within a transparent material by means of what?
Faraday/electrons
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
Total internal reflection
No - it increases the speed at which the rxn reaches that equilibrium

11. What is newton's second law?
Ease of polarizability of the molecule and thus increasing molecular weight of mass
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant
A constant force on a mass causes it to have a constant acceleration
Colligative: it depends on the number of solute molecules in a given volume of water

12. If any species is gotten rid of when combining two equations of chemical rxns together what can you conclude about those species?
[S][2S]^2 = 4S^3
That they are catalysts in the rxn because they react with the substrate and are reformed
Alkali metals = first column
Zero

13. If the source of sound and the listener are traveling side by side at the same speed - what will the change in freq heard by the listener be?
A salt and water
0 Hz because they are traveling side by side at the same speed
Polar
E = (kq)/r^2

14. 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
Decreasing potential energy
They do not differ
That they are catalysts in the rxn because they react with the substrate and are reformed

15. So if you are given an equation and it gives you the E^o for both side equations seen in the big equation - what do you do with them?
Add them together
Alkali metals = first column
[A]^a[B]^b
Accelerated by a higher voltage between the cathode and anode

16. What are the units of an electric field?
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant
Positron emission
You look at what is being oxidized and reduced in the problem
V/m or N/C

17. Isotopes have diff number of ______ but same what?
It will be reduced the voltage produced by the resistor which means IR; E- IR
From peak to peak
Add them together
Neutrons; atomic number

18. Friction is caused by what?
Mv = mv
[A]^a[B]^b
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
Attractive molecular forces acting between material surfaces in contact

19. What kind of metals react violently with water?
Its intensity in the spectrum
The reaction between the base and water
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio
Alkali metals = first column

20. In PV=nRT - if temp increases what will happen to volume?
It experiences a constant electric force of qE and will thus accelerate towards the positive plate
It will increase as well because they are directly related - only if pressure is kept constant
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous
W = F(displacement)

21. The visible spectrum ranges from ____ to _____
400 to 700 nm
When all the external forces = zero
0 Hz because they are traveling side by side at the same speed
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant

22. Why is it important that the materials used as scintillators are nearly transparent to the wavelength of light they emit?
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)
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
From peak to peak
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles

23. What is the law of conservation of linear momentum?
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
Vertically; perpendicular to all surfaces
They increase because you hear a lower frequency
Mv = mv

24. 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?
B = pVg; density
It has a positive oxidation potential so it is easily oxidized
Liquid displaced by that object
Alkali metals = first column

25. What is the principal quantum number (n)?
Electron shell number
(+)
Zero
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors

26. Terminal voltage is provided to what?
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure
Momentum
You look at what is being oxidized and reduced in the problem
External components of the circuit

27. What is the equation for a period (T)? What is the equation for angular velocity?
The buoyant force on it; W = mg = pVg
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
T = 2pi/angular velocity; v/r
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c

28. How do you find moles of a substance when you are given faradays and electrons?
Faraday/electrons
180 degrees; when there is half a wave distance in phase between two waves
It can also equal 'mg'; the compressive strength of a substance
They increase because you hear a lower frequency

29. What type of acid and base would produce a pH closest to 7?
Faraday/electrons
Strong acid and strong base/ weak acid and weak base
Mag and direction
V/m or N/C

30. What is Newton's Universal Law of Gravitation?
Voltage
The mass number stays the number but the atomic number decreases by one - usually resulting in another element
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
F = GMm/r^2

31. The freezing point of an aqueous solution is what kind of property? What does this mean?
From peak to peak
Colligative: it depends on the number of solute molecules in a given volume of water
You look at what is being oxidized and reduced in the problem
Electron shell number

32. if lead is successively preciptated as PbSO4 - PbI - and PbCO2 - which is less soluble than which? Thus which anions will be precipitated first?
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
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
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
From peak to peak

33. What happens if an atom undergoes positron decay or electron capture?
Voltage
The mass number stays the number but the atomic number decreases by one - usually resulting in another element
No - it increases the speed at which the rxn reaches that equilibrium
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

34. How do you find wavelength if you known distance from adjacent crests and troughs?
The regular one
Its twice that distance
0 Hz because they are traveling side by side at the same speed
Mv = mv

35. How do you figure out the literature Ksp value of a compound?
It's weight = mg; h
The path is longer on the inclined plane so it will take object longer to reach the bottom
A saturated solution in which the aqueous ions are in equilibrium with the solid
P = IV

36. 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
L = wavelength/2 so L= (wavelength)(2)
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
Neutrons; atomic number

37. The free energy change (G) must be negative when what?
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)
The force along the board to the normal force
They are directly proportional
H = negative and S = positive

38. What kind of geometry is octahedral?
When you have central atom with six ions on it
The volume of the ice cube or whatever it is
Decreasing potential energy
6.02 x 10^23 ions/mol

39. What is the equation for pressure?
It has a positive oxidation potential so it is easily oxidized
Density (gravitational constant) height
The buoyant force on it; W = mg = pVg
That it is negative

40. Nuclear masses can be approximated from what?

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41. What color is above 656 nm?
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
Red
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
Colligative: it depends on the number of solute molecules in a given volume of water

42. In Bohr model of atom when is energy emitted?
The regular one
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
(density[p])(volume)
When electron falls from high energy to low energy level

43. If you have circuit elements in parallel what is the same across them?
Voltage
F =ma and F= qE
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
Ease of polarizability of the molecule and thus increasing molecular weight of mass

44. Hydrogen has what kind of standard oxidation or reduction potential?
Zero
Electrons from anode and battery
It will be reduced the voltage produced by the resistor which means IR; E- IR
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)

45. The basicity constant Kb measures what?
Colligative; the number of solute particles present
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
(density[p])(volume)
How strong a base is

46. Regarding M(OH)2 and you have solubility (S) - what would the Ksp be?
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water
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
[S][2S]^2 = 4S^3
V/m or N/C

47. As a balloon rises in a tank of water what happens to the temperature inside it? Why would this happen?
H = negative and S = positive
It decreases; the work done by the gas in expanding decreases its internal energy
They do not differ
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

48. If asked which electron configuration of an element is most stable which one do you choose?
The regular one
When all the external forces = zero
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 absorb light that lets other electrons fill those orbitals

49. Melting occurs at what type of temperature? Why?
Constant to overcome the heat of fusion (solid to liquid state)
No - it increases the speed at which the rxn reaches that equilibrium
A salt and water
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces

50. 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?
T = 2pi/angular velocity; v/r
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
H = negative and S = positive
Zero