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. Does the temperature of a water bath or amount of water in a water bath determines if a substance melts?
Cathode; anode
Only temperature of the water bath
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water
They must balance


2. The coefficient of kinetic friction is always lower than what? Therefore what?
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
P = IV
That of static friction; there is a net accelerating force on the block once it starts to slide
When you have central atom with six ions on it


3. Isotopes have diff number of ______ but same what?
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c
Mg
Neutrons; atomic number
When HIn is turned into In- - which is dependent upon the pKa of the indicator


4. Melting occurs at what type of temperature? Why?
The path is longer on the inclined plane so it will take object longer to reach the bottom
Positive
Faraday/electrons
Constant to overcome the heat of fusion (solid to liquid state)


5. When is a body in translational equilibrium?
It has a positive oxidation potential so it is easily oxidized
When all the external forces = zero
It can absorb light that lets other electrons fill those orbitals
The lowest whole number ratio of moles of each element in a mole of a cmpd


6. If you have an alcohol with OH on the end and then another cmpd with an O in the middle but no H - what is different between the bonds they can make with water?

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7. What is the magnetic quantum number?
That it is negative
Colligative: it depends on the number of solute molecules in a given volume of water
-l to +l
No - it increases the speed at which the rxn reaches that equilibrium


8. A plane mirror produces an image where?
Ability to locate an event in space
At an equal distance behind it as the object is in front of the mirror
It will increase as well because they are directly related - only if pressure is kept constant
One that has more solute particles per liter of solution


9. if lead is successively preciptated as PbSO4 - PbI - and PbCO2 - which is less soluble than which? Thus which anions will be precipitated first?
They are directly proportional
The lowest whole number ratio of moles of each element in a mole of a cmpd
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
Helium; 4


10. What kind of metals react violently with water?
Alkali metals = first column
Mag and direction
They increase because you hear a lower frequency
The element's mass number


11. What is weight equal to?
Mg
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
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
The number of electrons emitted


12. A floating ice cube implies that it's weight is balanced by what?
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
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles
Liquid displaced by that object
The buoyant force on it; W = mg = pVg


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

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14. When a falling mass is at terminal speed - what is the power expended by the air resistance?
The path is longer on the inclined plane so it will take object longer to reach the bottom
Momentum
P = F(v) = mg(v -terminal)
The particle's charge and the magnitude of the electric field


15. What is newton's second law?
Sp^3
A constant force on a mass causes it to have a constant acceleration
That of static friction; there is a net accelerating force on the block once it starts to slide
Accelerated by a higher voltage between the cathode and anode


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

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17. Terminal voltage is provided to what?
External components of the circuit
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect
Positron emission
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


18. In a rxn - how do you figure out which atom has the highest electron affinity?
The reaction between the base and water
Cathode; anode
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


19. Considering the answer in the last slide - what kind of a solution would have a lower freezing pt?
The element's mass number
When all the external forces = zero
One that has more solute particles per liter of solution
Its intensity in the spectrum


20. What is a metathesis rxn?
Accelerated by a higher voltage between the cathode and anode
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
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
They are directly proportional


21. What does specific heat of a substance tell you? Thus what does a higher specific heat tell you?
Mass number stays the same but the atomic number increases
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
Ability to locate an event in space
Decreasing potential energy


22. Neither N2 or O2 have a permanent what? What does this mean?
Energy
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces
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
The particle's charge and the magnitude of the electric field


23. The free energy change (G) must be negative when what?
Mv = mv
H = negative and S = positive
Colligative; the number of solute particles present
They are directly proportional


24. In PV=nRT - if temp increases what will happen to volume?
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
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
Only temperature of the water bath
It will increase as well because they are directly related - only if pressure is kept constant


25. If you have circuit elements in parallel what is the same across them?
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 one
Only temperature of the water bath
Voltage


26. In radioactive decay the atomic number (A) and mass number (Z) must what?
Sp^3
They must balance
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
Mass number stays the same but the atomic number increases


27. Why is it important that the materials used as scintillators are nearly transparent to the wavelength of light they emit?
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
Density (gravitational constant) height
Positron because this is known as positron decay/electron capture
It will increase as well because they are directly related - only if pressure is kept constant


28. The concentration of OH and H30 ions are approximately equal at what pH?
Ease of polarizability of the molecule and thus increasing molecular weight of mass
7 always!!!
6.02 x 10^23 ions/mol
Only temperature of the water bath


29. What is the unit for Young's Modulus?
Pascal (N*m^2)
F =ma and F= qE
Cathode; anode
It has a positive oxidation potential so it is easily oxidized


30. Strength of dispersion force increases with what?
Alkali metals = first column
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
Ease of polarizability of the molecule and thus increasing molecular weight of mass
Polar


31. What is sublimation?
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
Decreasing potential energy
Going from solid to gas phase
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


32. What is one faraday equal to?
Colligative; the number of solute particles present
One mole of electric charge
No - it increases the speed at which the rxn reaches that equilibrium
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


33. What is different between an inclined plane and free fall?
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
P = IV
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
The path is longer on the inclined plane so it will take object longer to reach the bottom


34. What is usually conserved over oscillation periods?
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
Energy
It can absorb light that lets other electrons fill those orbitals
They are directly proportional


35. As a balloon rises in a tank of water what happens to the temperature inside it? Why would this happen?
Ease of polarizability of the molecule and thus increasing molecular weight of mass
It decreases; the work done by the gas in expanding decreases its internal energy
Where an event took place
Attractive molecular forces acting between material surfaces in contact


36. The square root of 10^anything is equal to what?
Half of the exponent
Energy
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
B = pVg; density


37. How do you find moles of a substance when you are given faradays and electrons?
Only temperature of the water bath
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c
Ability to locate an event in space
Faraday/electrons


38. How do you find length of time something is in flight? How do you find distance it traveled?
6.02 x 10^23 ions/mol
Total internal reflection
T = (2h/g)^1/2; distance = vt
The reaction between the base and water


39. What are the three separate module for tensile stress - shear stress - and compression/expansion?

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40. What is the hybridization of oxygen in water and other oxygens similar to water with two bonds and two lone pairs of electrons?
Sp^3
The buoyant force on it; W = mg = pVg
The lowest whole number ratio of moles of each element in a mole of a cmpd
Add them together


41. Why would a solution with unfilled orbitals be responsible for turning a solution a certian color?
It can absorb light that lets other electrons fill those orbitals
It's weight = mg; the work would be the weight times the distance fell
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles


42. The boiling point of a solution is what type of property? Which means is depends only on what?
Isolating an atom from minerals by decomposing the minerals with an electric current
It will increase as well because they are directly related - only if pressure is kept constant
Colligative; the number of solute particles present
Red


43. Nuclear masses can be approximated from what?

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44. What is the law of conservation of linear momentum?
That it is negative
It decreases; the work done by the gas in expanding decreases its internal energy
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
Mv = mv


45. 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?
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 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
External components of the circuit
It experiences a constant electric force of qE and will thus accelerate towards the positive plate


46. Pressure in a liquid is proportional to what? So why does this explain why blood pressure is greater in legs?
Sp^3
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
Accelerated by a higher voltage between the cathode and anode
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles


47. When something is falling what is the force acting on it? Thus what would be the work done?

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48. When the source of a sound is flying away from you what happens to the wavelengths from peak to peak?
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect
At an equal distance behind it as the object is in front of the mirror
They increase because you hear a lower frequency
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed


49. Acetic acid is a ______ solvent
P = F(v) = mg(v -terminal)
Polar
One that has more solute particles per liter of solution
400 to 700 nm


50. What if the circuit elements are in series?
T = 2pi/angular velocity; v/r
It decreases; the work done by the gas in expanding decreases its internal energy
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
The current is the same