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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. What is the formula for the power supplied by a battery to accelerate an electron beam?
Its momentum is zero because velocity is zero; zero because of conservation of momentum
Add them together
P = IV
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

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

3. How do you find moles of a substance when you are given faradays and electrons?
Faraday/electrons
A positron or electron; when atomic number goes up you know an electron has been emitted
The regular one
At an equal distance behind it as the object is in front of the mirror

4. The total pressure of a solution is what? Give example.
The mass number stays the number but the atomic number decreases by one - usually resulting in another element
Shorter than it should be so rays from a distant object form in front of retina; use divergent lens
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
F =ma and F= qE

5. 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
Sp^3
Alkali metals = first column
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. If you have longer wavelengths how is their freq and energy compared to shorter wavelengths?
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous
Electrons from anode and battery
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
Positron emission

7. If any species is gotten rid of when combining two equations of chemical rxns together what can you conclude about those species?
Isolating an atom from minerals by decomposing the minerals with an electric current
It experiences a constant electric force of qE and will thus accelerate towards the positive plate
The mass number stays the number but the atomic number decreases by one - usually resulting in another element
That they are catalysts in the rxn because they react with the substrate and are reformed

8. What happens if an atom undergoes positron decay or electron capture?
It's weight = mg; h
The mass number stays the number but the atomic number decreases by one - usually resulting in another element
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c
It can also equal 'mg'; the compressive strength of a substance

9. How would you find rate of rxn from pH 1 to pH2?
The number of electrons emitted
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
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
Accelerated by a higher voltage between the cathode and anode

10. A floating ice cube implies that it's weight is balanced by what?
Mass number stays the same but the atomic number increases
Pascal (N*m^2)
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
The buoyant force on it; W = mg = pVg

11. 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
External components of the circuit
The number of electrons emitted
It's weight = mg; the work would be the weight times the distance fell

12. 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?
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio
Only temperature of the water bath
Energy

13. In radioactive decay the atomic number (A) and mass number (Z) must what?
Mag and direction
They must balance
Voltage
180 degrees; when there is half a wave distance in phase between two waves

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
When electron falls from high energy to low energy level
E = (kq)/r^2
An odd number

15. What is the magnetic quantum number?
An odd number
Electrons from anode and battery
It experiences a constant electric force of qE and will thus accelerate towards the positive plate
-l to +l

16. What gas is evolved when copper is placed in a nitric acid (HNO3) solution? This is what type of rxn?
A salt and water
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous
NO; reduction-oxidation
Light is absorbed and re-emitted by the atomic structure of the optically dense medium

17. What is the unit for Young's Modulus?
The particle's charge and the magnitude of the electric field
P = F(v) = mg(v -terminal)
The lowest one
Pascal (N*m^2)

18. A cmpd with the lowest carbon to oxygen ratio will require how much oxygen for combustion?
Energy
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio
[A]^a[B]^b
A saturated solution in which the aqueous ions are in equilibrium with the solid

19. In a healthy person standing at rest - a comparison of arterial blood pressure measured in the arm with that in the leg - shows what about the differences between these pressures?
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure
One mole of electric charge
Constant to overcome the heat of fusion (solid to liquid state)
It can also equal 'mg'; the compressive strength of a substance

20. How many mL is in one liter?
Red
1000
Alkali metals = first column
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14

21. An oxidation-reduction rxn that occurs spontaneously has what kind of E^o for the cell?
H = negative and S = positive
Positive
The regular one
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

22. What is the net result on a nucleus when you absorb a deuturon and emit a neutron?
The nucleus gains a proton and no neutrons
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
W = F(displacement)
H has a small atomic radius

23. How do you find length of time something is in flight? How do you find distance it traveled?
Red
Mag and direction
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
T = (2h/g)^1/2; distance = vt

24. Why does light travel slower in an optically dense medium than through a vacuum?
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
T = 2pi/angular velocity; v/r
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
Total internal reflection

25. Neither N2 or O2 have a permanent what? What does this mean?
L = wavelength/2 so L= (wavelength)(2)
Constant to overcome the heat of fusion (solid to liquid state)
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces
(+)

26. What is the spin projection quantum number?
400 to 700 nm
The mass number stays the number but the atomic number decreases by one - usually resulting in another element
Faraday/electrons
+/- 1/2

27. Acetic acid is a ______ solvent
No - it increases the speed at which the rxn reaches that equilibrium
Mass number stays the same but the atomic number increases
Polar
F = GMm/r^2

28. When you are trying to calculate a galvanic cell's emf - what do you look at?
Strong acid and strong base/ weak acid and weak base
You look at what is being oxidized and reduced in the problem
When electron falls from high energy to low energy level
P = F(v) = mg(v -terminal)

29. What if the circuit elements are in series?
When you have central atom with six ions on it
P = IV
You look at what is being oxidized and reduced in the problem
The current is the same

30. What is a metathesis rxn?
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water
It has a positive oxidation potential so it is easily oxidized
T = 2pi/angular velocity; v/r
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

31. 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?
They increase because you hear a lower frequency
The density of the water and volume of the lead object
An odd number
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

32. The concentration of OH and H30 ions are approximately equal at what pH?
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles
Ease of polarizability of the molecule and thus increasing molecular weight of mass
7 always!!!
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

33. What is conserved in an inellastic collision?
The regular one
T = 2pi/angular velocity; v/r
It has a positive oxidation potential so it is easily oxidized
Momentum

34. What is the equation for pressure?
P = IV
Density (gravitational constant) height
0 Hz because they are traveling side by side at the same speed
External components of the circuit

35. 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
Mass number stays the same but the atomic number increases
From peak to peak
No - it increases the speed at which the rxn reaches that equilibrium

36. 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?
[S][2S]^2 = 4S^3
Its momentum is zero because velocity is zero; zero because of conservation of momentum
1000
0 Hz because they are traveling side by side at the same speed

37. In general what is formed by an acid-base rxn?
A salt and water
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
Decreasing potential 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

38. What is Avagadro's number regarding ions/mol?
Electron shell number
6.02 x 10^23 ions/mol
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
The reaction between the base and water

39. What are the units of an electric field?
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water
V/m or N/C
It's weight = mg; h
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces

40. What does spatial resolution refer to?
Ability to locate an event in space
Positron because this is known as positron decay/electron capture
Add them together
6.02 x 10^23 ions/mol

41. A plane mirror produces an image where?
At an equal distance behind it as the object is in front of the mirror
The lowest whole number ratio of moles of each element in a mole of a cmpd
Neutrons; atomic number
V/m or N/C

42. How do the final velocities differ if a sphere is dropped from a distance rather than rolled down an inclined plane?
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
They do not differ
Sp^3
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles

43. Melting occurs at what type of temperature? Why?
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
[A]^a[B]^b
P = F(v) = mg(v -terminal)
Constant to overcome the heat of fusion (solid to liquid state)

44. What do electrolytic techniques involve?
W = F(displacement)
Isolating an atom from minerals by decomposing the minerals with an electric current
Vertically; perpendicular to all surfaces
The lowest whole number ratio of moles of each element in a mole of a cmpd

45. What is one faraday equal to?
Vertically; perpendicular to all surfaces
One mole of electric charge
Half of the exponent
0 Hz because they are traveling side by side at the same speed

46. If both weight and bouyant force are dependent on g - that makes g independent of what?
Gravity
The volume of the ice cube or whatever it is
Mag and direction
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R

47. Charged particles in motion constitute what? Freely moving charges are deflected by what? The curved path depends on what?
In the presence of a base
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
Mg
A constant force on a mass causes it to have a constant acceleration

48. Light can be carried along a distance within a transparent material by means of what?
The density of the water and volume of the lead object
Total internal reflection
A constant force on a mass causes it to have a constant acceleration
-l to +l

49. When an element decreases its atomic number by one what is emitted?
+/- 1/2
Mg
3+
Positron because this is known as positron decay/electron capture

50. What is the magnitude of the electric field produced by a point charge?
E = (kq)/r^2
A positron or electron; when atomic number goes up you know an electron has been emitted
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
Yes - if the particle's trail is equidistant between two adjacent anodes