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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 you have longer wavelengths how is their freq and energy compared to shorter wavelengths?
A positron or electron; when atomic number goes up you know an electron has been emitted
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous
Ability to locate an event in space
The current is the same

2. What is weight equal to?
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
Alkali metals = first column
The regular one
Mg

3. What does spatial resolution refer to?
The current is the same
Ability to locate an event in space
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 intensity in the spectrum

4. If temperature arises during a mixture what can you conclude about the enthalpy?
1) Young's Modulus 2) Shear Modulus 3) Bulk Modulus
That it is negative
H = negative and S = positive
B = pVg; density

5. In Bohr model of atom when is energy emitted?
Decreasing potential energy
When electron falls from high energy to low energy level
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

6. The boiling point of a solution is what type of property? Which means is depends only on what?
No - it increases the speed at which the rxn reaches that equilibrium
Isolating an atom from minerals by decomposing the minerals with an electric current
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c
Colligative; the number of solute particles present

7. What happens if an atom undergoes positron decay or electron capture?
F = GMm/r^2
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure
[A]^a[B]^b
The mass number stays the number but the atomic number decreases by one - usually resulting in another element

8. Regarding M(OH)2 and you have solubility (S) - what would the Ksp be?
Zero
[S][2S]^2 = 4S^3
A constant force on a mass causes it to have a constant acceleration
Alkali metals = first column

9. Why are bonds between H and another atom shorter compared to most?
1) Young's Modulus 2) Shear Modulus 3) Bulk Modulus
Ease of polarizability of the molecule and thus increasing molecular weight of mass
One that has more solute particles per liter of solution
H has a small atomic radius

10. How many mL is in one liter?
-l to +l
1000
F =ma and F= qE
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

11. The closer the spacing of the anode wire - the better one can specify what?
It will increase as well because they are directly related - only if pressure is kept constant
External components of the circuit
Where an event took place
P = IV

12. 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?
It's weight = mg; h
Its momentum is zero because velocity is zero; zero because of conservation of momentum
Where an event took place
You look at what is being oxidized and reduced in the problem

13. Pressure in a liquid is proportional to what? So why does this explain why blood pressure is greater in legs?
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
(density[p])(volume)
In the presence of a base
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

14. 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
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
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
H = negative and S = positive

15. 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?
L = wavelength/2 so L= (wavelength)(2)
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
(+)
When HIn is turned into In- - which is dependent upon the pKa of the indicator

16. As a balloon rises in a tank of water what happens to the temperature inside it? Why would this happen?
It can also equal 'mg'; the compressive strength of a substance
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
It decreases; the work done by the gas in expanding decreases its internal energy

17. In order to guarantee a non-zero spin how many electrons are needed?
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
The particle's charge and the magnitude of the electric field
An odd number
Force times the distance over which the force acts

18. What is conserved in an inellastic collision?
Momentum
When all the external forces = zero
No - it increases the speed at which the rxn reaches that equilibrium
T = 2pi/angular velocity; v/r

19. When is a body in translational equilibrium?
Positron because this is known as positron decay/electron capture
Add them together
The number of electrons emitted
When all the external forces = zero

20. What happens to the atomic number and atomic mass of an element that go under Beta decay or positron emission?
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces
180 degrees; when there is half a wave distance in phase between two waves
They are directly proportional
Mass number stays the same but the atomic number increases

21. Friction is caused by what?
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure
Colligative: it depends on the number of solute molecules in a given volume of water
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
Attractive molecular forces acting between material surfaces in contact

22. The probability of an X-ray emission event at a given wavelength is measured by what?
Positron emission
Its intensity in the spectrum
The lowest whole number ratio of moles of each element in a mole of a cmpd
Mg

23. If asked which electron configuration of an element is most stable which one do you choose?
Total internal reflection
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
The regular one
Electrons from anode and battery

24. Mechanical waves in a medium fxn to transport what?
Its twice that distance
Its momentum is zero because velocity is zero; zero because of conservation of momentum
Positron emission
Energy

25. What is the magnitude of the electric field produced by a point charge?
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
When you have central atom with six ions on it
An odd number
E = (kq)/r^2

26. What is the equation for bouyant force? What is p?
(+)
B = pVg; density
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
When electron falls from high energy to low energy level

27. When a falling mass is at terminal speed - what is the power expended by the air resistance?
Helium; 4
P = F(v) = mg(v -terminal)
-l to +l
E = (kq)/r^2

28. In PV=nRT - if temp increases what will happen to volume?
Neutrons; atomic number
T = 2pi/angular velocity; v/r
It will increase as well because they are directly related - only if pressure is kept constant
7 always!!!

29. Considering the answer in the last slide - what kind of a solution would have a lower freezing pt?
One that has more solute particles per liter of solution
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces
F = GMm/r^2
Alkali metals = first column

30. What is the amt of energy that a frictional force generates?
Colligative: it depends on the number of solute molecules in a given volume of water
1000
Positron because this is known as positron decay/electron capture
Force times the distance over which the force acts

31. How do you balance redox rxns?

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32. A nearsighted person has what type of focal length? Thus what do we do to correct this?
Helium; 4
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
Shorter than it should be so rays from a distant object form in front of retina; use divergent lens

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

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34. When does red litmus paper turn blue?
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
In the presence of a base
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)
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

35. When an element decreases its atomic number by one what is emitted?
The density of the water and volume of the lead object
Positron because this is known as positron decay/electron capture
Polar
Yes - if the particle's trail is equidistant between two adjacent anodes

36. Charged particles in motion constitute what? Freely moving charges are deflected by what? The curved path depends on what?
It can absorb light that lets other electrons fill those orbitals
(+)
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
The particle's charge and the magnitude of the electric field

37. The basicity constant Kb measures what?
+/- 1/2
Its twice that distance
The path is longer on the inclined plane so it will take object longer to reach the bottom
How strong a base is

38. The concentration of OH and H30 ions are approximately equal at what pH?
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
At an equal distance behind it as the object is in front of the mirror
7 always!!!
They must balance

39. 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
That they are catalysts in the rxn because they react with the substrate and are reformed
The lowest one
B = pVg; density

40. Is the work done by air resistance - positive or negative?
Negative
Cathode; anode
Polar
Alkali metals = first column

41. In order to increase the kinetic energy of electrons - they must be 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
Accelerated by a higher voltage between the cathode and anode
The nucleus gains a proton and no neutrons
Negative

42. What is the law of conservation of linear momentum?
When HIn is turned into In- - which is dependent upon the pKa of the indicator
Electron shell number
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
Mv = mv

43. In a galvanic and electrolytic cell - reduction of an ion occurs where? Oxidation of an ion occurs where?
Positive
Cathode; anode
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

44. How would you find rate of rxn from pH 1 to pH2?
Density (gravitational constant) height
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
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous
T = (2h/g)^1/2; distance = vt

45. The range of pH in which a color change takes place in a titration depends on what?
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
Liquid displaced by that object
When HIn is turned into In- - which is dependent upon the pKa of the indicator
In the presence of a base

46. What is the equation for pressure?
Density (gravitational constant) height
1000
Ability to locate an event in space
It has a positive oxidation potential so it is easily oxidized

47. Beta decay is the emission of what? How do you know what it is the emission of?
Its momentum is zero because velocity is zero; zero because of conservation of momentum
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
A positron or electron; when atomic number goes up you know an electron has been emitted
+/- 1/2

48. In general what is formed by an acid-base rxn?
A salt and water
They increase because you hear a lower frequency
Attractive molecular forces acting between material surfaces in contact
External components of the circuit

49. What is the magnetic quantum number?
Its momentum is zero because velocity is zero; zero because of conservation of momentum
W = F(displacement)
-l to +l
Total internal reflection

50. For a given flow rate - the speed of fluid flow is inversely proportional to what?
Alkali metals = first column
The cross-sectional area through which the fluid flows
The density of the water and volume of the lead object
Total internal reflection