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DSST Physical Sciences2

Subjects : dsst, science

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. The temperature of a metal will not increase above its melting point until what?
Energy
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
The reaction between the base and water
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting

2. If the standard potential for a rxn is negative when it is being reduced (thus a negative reduction potential) that means that the resulting atom has what?
It has a positive oxidation potential so it is easily oxidized
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
Voltage
Half of the exponent

3. A nearsighted person has what type of focal length? Thus what do we do to correct this?
F =ma and F= qE
0 Hz because they are traveling side by side at the same speed
The volume of the ice cube or whatever it is
Shorter than it should be so rays from a distant object form in front of retina; use divergent lens

4. What is weight equal to?
Mg
Positron emission
Only temperature of the water bath
Pascal (N*m^2)

5. When the source of a sound is flying away from you what happens to the wavelengths from peak to peak?
That they are catalysts in the rxn because they react with the substrate and are reformed
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
Isolating an atom from minerals by decomposing the minerals with an electric current
They increase because you hear a lower frequency

6. When is a body in translational equilibrium?
One that has more solute particles per liter of solution
When you have central atom with six ions on it
When all the external forces = zero
Light is absorbed and re-emitted by the atomic structure of the optically dense medium

7. How do you find wavelength if you known distance from adjacent crests and troughs?
Its twice that distance
P = IV
Positron emission
An odd number

8. If something is very toxic to a human - what Ksp value should it have for it to be the safest?
The lowest one
When you have central atom with six ions on it
V/m or N/C
It experiences a constant electric force of qE and will thus accelerate towards the positive plate

9. A floating ice cube implies that it's weight is balanced by what?
The buoyant force on it; W = mg = pVg
At an equal distance behind it as the object is in front of the mirror
The current is the same
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)

10. Pressure in a liquid is proportional to what? So why does this explain why blood pressure is greater in legs?
The reaction between the base and water
The force along the board to the normal force
Its momentum is zero because velocity is zero; zero because of conservation of momentum
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)

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

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12. In Bohr model of atom when is energy emitted?
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
At an equal distance behind it as the object is in front of the mirror
When electron falls from high energy to low energy level
400 to 700 nm

13. In general what is formed by an acid-base rxn?
A salt and water
It decreases; the work done by the gas in expanding decreases its internal energy
T = 2pi/angular velocity; v/r
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

14. The probability of an X-ray emission event at a given wavelength is measured by what?
Its intensity in the spectrum
Energy
When HIn is turned into In- - which is dependent upon the pKa of the indicator
At an equal distance behind it as the object is in front of the mirror

15. When a falling mass is at terminal speed - what is the power expended by the air resistance?
Attractive molecular forces acting between material surfaces in contact
P = F(v) = mg(v -terminal)
Yes - if the particle's trail is equidistant between two adjacent anodes
The reaction between the base and water

16. How should the period of a waveform be calculated?
[S][2S]^2 = 4S^3
Add them together
It can also equal 'mg'; the compressive strength of a substance
From peak to peak

17. Isotopes have diff number of ______ but same what?
Positive
The nucleus gains a proton and no neutrons
Neutrons; atomic number
Where an event took place

18. What is the hybridization of oxygen in water and other oxygens similar to water with two bonds and two lone pairs of electrons?
Density (gravitational constant) height
It will increase as well because they are directly related - only if pressure is kept constant
Sp^3
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14

19. Beta decay is the same as what?
Vertically; perpendicular to all surfaces
E = (kq)/r^2
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
Positron emission

20. If temperature arises during a mixture what can you conclude about the enthalpy?
They are directly proportional
A saturated solution in which the aqueous ions are in equilibrium with the solid
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
That it is negative

21. An oxidation-reduction rxn that occurs spontaneously has what kind of E^o for the cell?
-l to +l
Positive
Attractive molecular forces acting between material surfaces in contact
Constant to overcome the heat of fusion (solid to liquid state)

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

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23. The closer the spacing of the anode wire - the better one can specify what?
Where an event took place
The regular one
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
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

24. Equivalent mass is what?
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)
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
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous
Strong acid and strong base/ weak acid and weak base

25. The coefficient of static friction is the ratio of what?
H = negative and S = positive
The lowest one
Add them together
The force along the board to the normal force

26. If any species is gotten rid of when combining two equations of chemical rxns together what can you conclude about those species?
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
The number of electrons emitted
That they are catalysts in the rxn because they react with the substrate and are reformed
7 always!!!

27. Always remember that velocity has ____ and ____
That they are catalysts in the rxn because they react with the substrate and are reformed
6.02 x 10^23 ions/mol
Mag and direction
Total internal reflection

28. 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?
Going from solid to gas phase
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect
Vertically; perpendicular to all surfaces
Accelerated by a higher voltage between the cathode and anode

29. The electrons emitted from cathode are replaced with what?
When HIn is turned into In- - which is dependent upon the pKa of the indicator
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous
Total internal reflection
Electrons from anode and battery

30. What is the equation for work done?
Total internal reflection
W = F(displacement)
External components of the circuit
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting

31. What is the amt of energy that a frictional force generates?
The cross-sectional area through which the fluid flows
Force times the distance over which the force acts
Pascal (N*m^2)
When all the external forces = zero

32. Is the work done by air resistance - positive or negative?
P = F(v) = mg(v -terminal)
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous
The lowest whole number ratio of moles of each element in a mole of a cmpd
Negative

33. So if you are given an equation and it gives you the E^o for both side equations seen in the big equation - what do you do with them?
Add them together
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
180 degrees; when there is half a wave distance in phase between two waves
Zero

34. What is the spin projection quantum number?
Electrons from anode and battery
Attractive molecular forces acting between material surfaces in contact
+/- 1/2
Negative

35. In a galvanic and electrolytic cell - reduction of an ion occurs where? Oxidation of an ion occurs where?
Its momentum is zero because velocity is zero; zero because of conservation of momentum
Polar
Cathode; anode
An odd number

36. The square root of 10^anything is equal to what?
F = GMm/r^2
F =ma and F= qE
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)
Half of the exponent

37. In PV=nRT - if temp increases what will happen to volume?
Positive
F =ma and F= qE
It will increase as well because they are directly related - only if pressure is kept constant
Helium; 4

38. Nuclear masses can be approximated from what?

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39. The visible spectrum ranges from ____ to _____
Positron emission
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
H has a small atomic radius
400 to 700 nm

40. The total pressure of a solution is what? Give example.
In the presence of a base
Helium; 4
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
E = (kq)/r^2

41. How do you balance redox rxns?

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42. What is the unit for Young's Modulus?
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
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
Pascal (N*m^2)

43. How do you find specific gravity of an object?
Momentum
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
Decreasing potential energy
External components of the circuit

44. Melting occurs at what type of temperature? Why?
At an equal distance behind it as the object is in front of the mirror
(+)
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water
Constant to overcome the heat of fusion (solid to liquid state)

45. What happens if an atom undergoes positron decay or electron capture?
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces
It decreases; the work done by the gas in expanding decreases its internal energy
The mass number stays the number but the atomic number decreases by one - usually resulting in another element
Alkali metals = first column

46. Hydrogen has what kind of standard oxidation or reduction potential?
Zero
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c
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

47. What direction do gravity and bouyancy work? What direction does water pressure work?
Colligative; the number of solute particles present
E = (kq)/r^2
Vertically; perpendicular to all surfaces
F = GMm/r^2

48. Charged particles in motion constitute what? Freely moving charges are deflected by what? The curved path depends on what?
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
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
L = wavelength/2 so L= (wavelength)(2)
One that has more solute particles per liter of solution

49. The boiling point of a solution is what type of property? Which means is depends only on what?
Colligative; the number of solute particles present
400 to 700 nm
Polar
NO; reduction-oxidation

50. If both weight and bouyant force are dependent on g - that makes g independent of what?
The volume of the ice cube or whatever it is
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water
No - it increases the speed at which the rxn reaches that equilibrium
1000