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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.
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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. What happens if an atom undergoes positron decay or electron capture?
Density (gravitational constant) height
The mass number stays the number but the atomic number decreases by one - usually resulting in another element
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
A positron or electron; when atomic number goes up you know an electron has been emitted

2. Is the work done by air resistance - positive or negative?
Negative
That it is negative
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
T = (2h/g)^1/2; distance = vt

3. If temperature arises during a mixture what can you conclude about the enthalpy?
That it is negative
They increase because you hear a lower frequency
How strong a base is
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant

4. What does specific heat of a substance tell you? Thus what does a higher specific heat tell you?
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
6.02 x 10^23 ions/mol
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure
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

5. 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
Its momentum is zero because velocity is zero; zero because of conservation of momentum
They increase because you hear a lower frequency
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

6. Terminal voltage is provided to what?
External components of the circuit
E = (kq)/r^2
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
Alkali metals = first column

7. An oxidation-reduction rxn that occurs spontaneously has what kind of E^o for the cell?
Going from solid to gas phase
It decreases; the work done by the gas in expanding decreases its internal energy
Red
Positive

8. Half-sine wave shape is what kind of wavelength with regards to length?
Ease of polarizability of the molecule and thus increasing molecular weight of mass
A salt and water
Going from solid to gas phase
L = wavelength/2 so L= (wavelength)(2)

9. If you are given density and volume how do you find mass?
Energy
Total internal reflection
(density[p])(volume)
Accelerated by a higher voltage between the cathode and anode

10. What is the doppler equation for wavelength and frequency?
Helium; 4
The force along the board to the normal force
Only temperature of the water bath
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c

11. As a balloon rises in a tank of water what happens to the temperature inside it? Why would this happen?
It decreases; the work done by the gas in expanding decreases its internal energy
The lowest one
Vertically; perpendicular to all surfaces
P = F(v) = mg(v -terminal)

12. Charged particles in motion constitute what? Freely moving charges are deflected by what? The curved path depends on what?
Mv = mv
[S][2S]^2 = 4S^3
The element's mass 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

13. 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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14. How do you figure out the literature Ksp value of a compound?
Shorter than it should be so rays from a distant object form in front of retina; use divergent lens
[S][2S]^2 = 4S^3
A saturated solution in which the aqueous ions are in equilibrium with the solid
The nucleus gains a proton and no neutrons

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

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16. When does red litmus paper turn blue?
In the presence of a base
Colligative: it depends on the number of solute molecules in a given volume of water
The density of the water and volume of the lead object
Mag and direction

17. What is Newton's Universal Law of Gravitation?
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
Ease of polarizability of the molecule and thus increasing molecular weight of mass
F = GMm/r^2
It has a positive oxidation potential so it is easily oxidized

18. The volume of an object is equal to water?
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
No - it increases the speed at which the rxn reaches that equilibrium
Liquid displaced by that object

19. What is the spin projection quantum number?
It can also equal 'mg'; the compressive strength of a substance
The particle's charge and the magnitude of the electric field
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
+/- 1/2

20. What is the unit for Young's Modulus?
Positron because this is known as positron decay/electron capture
H has a small atomic radius
Pascal (N*m^2)
Energy

21. What does spatial resolution refer to?
When electron falls from high energy to low energy level
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
Ability to locate an event in space
Its momentum is zero because velocity is zero; zero because of conservation of momentum

22. Why does light travel slower in an optically dense medium than through a vacuum?
0 Hz because they are traveling side by side at the same speed
-l to +l
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
Polar

23. The freezing point of an aqueous solution is what kind of property? What does this mean?
Colligative: it depends on the number of solute molecules in a given volume of water
When you have central atom with six ions on it
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
That it is negative

24. What is the formula for the power supplied by a battery to accelerate an electron beam?
NO; reduction-oxidation
They increase because you hear a lower frequency
When you have central atom with six ions on it
P = IV

25. Beta decay is the emission of what? How do you know what it is the emission of?
A positron or electron; when atomic number goes up you know an electron has been emitted
1000
Faraday/electrons
It will increase as well because they are directly related - only if pressure is kept constant

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

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27. If you have longer wavelengths how is their freq and energy compared to shorter wavelengths?
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
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
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous
T = 2pi/angular velocity; v/r

28. Why is it important that the materials used as scintillators are nearly transparent to the wavelength of light they emit?
P = IV
At an equal distance behind it as the object is in front of the mirror
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
In the presence of a base

29. Mechanical waves in a medium fxn to transport what?
Energy
1) Young's Modulus 2) Shear Modulus 3) Bulk Modulus
Its momentum is zero because velocity is zero; zero because of conservation of momentum
Liquid displaced by that object

30. A saturated solution of KNO3 means what? If you add salt that has any of these two ions what will happen? What is this called?
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect
The nucleus gains a proton and no neutrons
Half of the exponent
-l to +l

31. If any species is gotten rid of when combining two equations of chemical rxns together what can you conclude about those species?
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 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
Total internal reflection
That they are catalysts in the rxn because they react with the substrate and are reformed

32. The concentration of OH and H30 ions are approximately equal at what pH?
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
A salt and water
7 always!!!
At an equal distance behind it as the object is in front of the mirror

33. What is a metathesis rxn?
Only temperature of the water bath
It can also equal 'mg'; the compressive strength of a substance
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
NO; reduction-oxidation

34. 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
P = F(v) = mg(v -terminal)
When you have central atom with six ions on it
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. What is the equation for a period (T)? What is the equation for angular velocity?
The element's mass number
L = wavelength/2 so L= (wavelength)(2)
T = 2pi/angular velocity; v/r
7 always!!!

36. The electrons emitted from cathode are replaced with what?
It can absorb light that lets other electrons fill those orbitals
The current is the same
That of static friction; there is a net accelerating force on the block once it starts to slide
Electrons from anode and battery

37. Neither N2 or O2 have a permanent what? What does this mean?
180 degrees; when there is half a wave distance in phase between two waves
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces
W = F(displacement)
External components of the circuit

38. The coefficient of kinetic friction is always lower than what? Therefore what?
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
Electron shell number
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

39. What is the amt of energy that a frictional force generates?
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio
Force times the distance over which the force acts
Total internal reflection
Positron emission

40. When the source of a sound is flying away from you what happens to the wavelengths from peak to peak?
It experiences a constant electric force of qE and will thus accelerate towards the positive plate
Negative
A saturated solution in which the aqueous ions are in equilibrium with the solid
They increase because you hear a lower frequency

41. How do you find specific gravity of an object?
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
They must balance
E = (kq)/r^2

42. 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?
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles
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 density of the water and volume of the lead object
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

43. How do you find moles of a substance when you are given faradays and electrons?
The nucleus gains a proton and no neutrons
Faraday/electrons
W = F(displacement)
E = (kq)/r^2

44. 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?
W = F(displacement)
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
Its twice that distance
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed

45. Heat from friction comes from what?
3+
Decreasing potential energy
Colligative; the number of solute particles present
At an equal distance behind it as the object is in front of the mirror

46. In a rxn - how do you figure out which atom has the highest electron affinity?
One mole of electric charge
Colligative: it depends on the number of solute molecules in a given volume of water
No - it increases the speed at which the rxn reaches that equilibrium
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

47. When is a body in translational equilibrium?
Vertically; perpendicular to all surfaces
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
When all the external forces = zero
No - it increases the speed at which the rxn reaches that equilibrium

48. The number of incident photons on the cathode affect what?
The number of electrons emitted
The current is the same
Where an event took place
They are directly proportional

49. In radioactive decay the atomic number (A) and mass number (Z) must what?
It can also equal 'mg'; the compressive strength of a substance
F = GMm/r^2
They must balance
A salt and water

50. Isotopes have diff number of ______ but same what?
The mass number stays the number but the atomic number decreases by one - usually resulting in another element
Negative
Neutrons; atomic number
Electron shell number