DSST Physical Sciences2

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. Nuclear masses can be approximated from what?

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2. The volume of an object is equal to water?
The lowest whole number ratio of moles of each element in a mole of a cmpd
Liquid displaced by that object
A constant force on a mass causes it to have a constant acceleration
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles


3. Half-sine wave shape is what kind of wavelength with regards to length?
A constant force on a mass causes it to have a constant acceleration
NO; reduction-oxidation
It can absorb light that lets other electrons fill those orbitals
L = wavelength/2 so L= (wavelength)(2)


4. Equivalent mass is what?
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
Ability to locate an event in space
When HIn is turned into In- - which is dependent upon the pKa of the indicator
Neutrons; atomic number


5. When you are trying to calculate a galvanic cell's emf - what do you look at?
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
You look at what is being oxidized and reduced in the problem
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
6.02 x 10^23 ions/mol


6. Mechanical waves in a medium fxn to transport what?
Sp^3
T = (2h/g)^1/2; distance = vt
Energy
It can also equal 'mg'; the compressive strength of a substance


7. Why are bonds between H and another atom shorter compared to most?
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
Helium; 4
H has a small atomic radius


8. In general what is formed by an acid-base rxn?
A salt and water
Sp^3
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting


9. What happens if an atom undergoes positron decay or electron capture?
Neutrons; atomic number
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
+/- 1/2
The mass number stays the number but the atomic number decreases by one - usually resulting in another element


10. What happens to the atomic number and atomic mass of an element that go under Beta decay or positron emission?
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)
H has a small atomic radius
Mass number stays the same but the atomic number increases
Mg


11. When the source of a sound is flying away from you what happens to the wavelengths from peak to peak?
They increase because you hear a lower frequency
It's weight = mg; the work would be the weight times the distance fell
External components of the circuit
B = pVg; density


12. How do you balance redox rxns?

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13. How do you find 'g' from Newton's law of gravity?
Accelerated by a higher voltage between the cathode and anode
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
Only temperature of the water bath


14. Charged particles in motion constitute what? Freely moving charges are deflected by what? The curved path depends on what?
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
[A]^a[B]^b
When you have central atom with six ions on it
Zero


15. The coefficient of kinetic friction is always lower than what? Therefore what?
6.02 x 10^23 ions/mol
Polar
One mole of electric charge
That of static friction; there is a net accelerating force on the block once it starts to slide


16. Strength of dispersion force increases with what?
Ease of polarizability of the molecule and thus increasing molecular weight of mass
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio
When all the external forces = zero
The density of the water and volume of the lead object


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

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18. 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?
F = GMm/r^2
The reaction between the base and 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
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


19. In order to guarantee a non-zero spin how many electrons are needed?
Add them together
An odd number
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
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


20. What is the equation for bouyant force? What is p?
B = pVg; density
Total internal reflection
Force times the distance over which the force acts
Polar


21. What does spatial resolution refer to?
Mg
1) Young's Modulus 2) Shear Modulus 3) Bulk Modulus
In the presence of a base
Ability to locate an event in space


22. In a galvanic and electrolytic cell - reduction of an ion occurs where? Oxidation of an ion occurs where?
Positive
Cathode; anode
It experiences a constant electric force of qE and will thus accelerate towards the positive plate
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous


23. 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
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles
Ability to locate an event in space


24. What is the equation for work done?
W = F(displacement)
L = wavelength/2 so L= (wavelength)(2)
The current is the same
Light is absorbed and re-emitted by the atomic structure of the optically dense medium


25. What happens to a negatively charged particle put between two parallel plates?
Neutrons; atomic number
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting
It experiences a constant electric force of qE and will thus accelerate towards the positive plate
Positron because this is known as positron decay/electron capture


26. In a rxn - how do you figure out which atom has the highest electron affinity?
The number of electrons emitted
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
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
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)


27. What does the empirical formula show?
The lowest whole number ratio of moles of each element in a mole of a cmpd
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
Colligative; the number of solute particles present
Half of the exponent


28. If both weight and bouyant force are dependent on g - that makes g independent of what?
It will be reduced the voltage produced by the resistor which means IR; E- IR
The number of electrons emitted
The nucleus gains a proton and no neutrons
The volume of the ice cube or whatever it is


29. How do you find what is the limiting reagent? You can then use the moles of the limiting reagent to calculate what?
The lowest one
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
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
When all the external forces = zero


30. What is the equation for pressure?
1) Young's Modulus 2) Shear Modulus 3) Bulk Modulus
Density (gravitational constant) height
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous


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

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32. 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?
It experiences a constant electric force of qE and will thus accelerate towards the positive plate
0 Hz because they are traveling side by side at the same speed
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
6.02 x 10^23 ions/mol


33. How do you find the equiv capacitance of capacitors in series and parallel? What about if you are trying to find equivalent resistance?
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
Vertically; perpendicular to all surfaces
They do not differ
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure


34. What kind of charge is on Al?
3+
The current is the same
[S][2S]^2 = 4S^3
Add them together


35. If you are given a table of substances and are told to find which two show effect of molecular weight on melting point alone - which two substances should you look for?
NO; reduction-oxidation
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
That of static friction; there is a net accelerating force on the block once it starts to slide


36. What is the magnitude of the electric field produced by a point charge?
E = (kq)/r^2
-l to +l
They are directly proportional
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure


37. At the moment of explosion of an object - what is its momementum? Why? After an explosion what is the total momentum carried by all the fragments?
Its momentum is zero because velocity is zero; zero because of conservation of momentum
W = F(displacement)
6.02 x 10^23 ions/mol
It can also equal 'mg'; the compressive strength of a substance


38. Young's modulus is a ________ for a material. What is it's ratio? What would a graph of it look like?
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
The reaction between the base and water
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
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant


39. A nearsighted person has what type of focal length? Thus what do we do to correct this?
Gravity
It's weight = mg; the work would be the weight times the distance fell
Shorter than it should be so rays from a distant object form in front of retina; use divergent lens
NO; reduction-oxidation


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

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41. The concentration of OH and H30 ions are approximately equal at what pH?
The lowest one
It will increase as well because they are directly related - only if pressure is kept constant
7 always!!!
How strong a base is


42. Why would a solution with unfilled orbitals be responsible for turning a solution a certian color?
Colligative; the number of solute particles present
An odd number
7 always!!!
It can absorb light that lets other electrons fill those orbitals


43. What is the equation for a period (T)? What is the equation for angular velocity?
T = 2pi/angular velocity; v/r
Momentum
P = IV
Ability to locate an event in space


44. How do you find moles of a substance when you are given faradays and electrons?
The element's mass number
Electrons from anode and battery
The buoyant force on it; W = mg = pVg
Faraday/electrons


45. What is the principal quantum number (n)?
Electron shell number
It decreases; the work done by the gas in expanding decreases its internal energy
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water


46. Acetic acid is a ______ solvent
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
It's weight = mg; the work would be the weight times the distance fell
Polar
It's weight = mg; h


47. When does red litmus paper turn blue?
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c
T = (2h/g)^1/2; distance = vt
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
In the presence of a base


48. The total pressure of a solution is what? Give example.
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
Its momentum is zero because velocity is zero; zero because of conservation of momentum
(density[p])(volume)
The lowest one


49. How do the final velocities differ if a sphere is dropped from a distance rather than rolled down an inclined plane?
Voltage
The particle's charge and the magnitude of the electric field
They do not differ
[A]^a[B]^b


50. 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?
T = 2pi/angular velocity; v/r
The path is longer on the inclined plane so it will take object longer to reach the bottom
(+)
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