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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. When an element decreases its atomic number by one what is emitted?
Add them together
Its twice that distance
Decreasing potential energy
Positron because this is known as positron decay/electron capture

2. What does the empirical formula show?
They do not differ
The current is the same
E = (kq)/r^2
The lowest whole number ratio of moles of each element in a mole of a cmpd

3. Light can be carried along a distance within a transparent material by means of what?
V/m or N/C
Colligative: it depends on the number of solute molecules in a given volume of water
Total internal reflection
(density[p])(volume)

4. What gas is evolved when copper is placed in a nitric acid (HNO3) solution? This is what type of rxn?
T = 2pi/angular velocity; v/r
Half of the exponent
NO; reduction-oxidation
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

5. Can a catalyst shift equilibrium?
No - it increases the speed at which the rxn reaches that equilibrium
A salt and water
B = pVg; density
An odd number

6. Equivalent mass is what?
It will increase as well because they are directly related - only if pressure is kept constant
[S][2S]^2 = 4S^3
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
3+

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

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8. What is the amt of energy that a frictional force generates?
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
H = negative and S = positive
A positron or electron; when atomic number goes up you know an electron has been emitted
Force times the distance over which the force acts

9. The probability of an X-ray emission event at a given wavelength is measured by what?
Force times the distance over which the force acts
Its intensity in the spectrum
An odd number
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors

10. Half-sine wave shape is what kind of wavelength with regards to length?
T = (2h/g)^1/2; distance = vt
L = wavelength/2 so L= (wavelength)(2)
H has a small atomic radius
Attractive molecular forces acting between material surfaces in contact

11. How do you find the equiv capacitance of capacitors in series and parallel? What about if you are trying to find equivalent resistance?
Colligative: it depends on the number of solute molecules in a given volume of water
Neutrons; atomic number
Electron shell number
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R

12. The closer the spacing of the anode wire - the better one can specify what?
400 to 700 nm
Where an event took place
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c
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

13. The visible spectrum ranges from ____ to _____
(+)
They are directly proportional
One mole of electric charge
400 to 700 nm

14. 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
Force times the distance over which the force acts
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
Voltage

15. If asked which electron configuration of an element is most stable which one do you choose?
Faraday/electrons
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
The regular one
The force along the board to the normal force

16. What is the magnetic quantum number?
-l to +l
Red
Ease of polarizability of the molecule and thus increasing molecular weight of mass
The nucleus gains a proton and no neutrons

17. How do you figure out the literature Ksp value of a compound?
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles
F =ma and F= qE
A saturated solution in which the aqueous ions are in equilibrium with the solid
They must balance

18. The concentration of OH and H30 ions are approximately equal at what pH?
1000
Decreasing potential energy
P = IV
7 always!!!

19. The basicity constant Kb measures what?
That it is negative
It has a positive oxidation potential so it is easily oxidized
How strong a base is
Colligative: it depends on the number of solute molecules in a given volume of water

20. How do you find wavelength if you known distance from adjacent crests and troughs?
Its twice that distance
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
The current is the same
Attractive molecular forces acting between material surfaces in contact

21. The force on an electrical charge is what?
An odd number
F =ma and F= qE
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
[A]^a[B]^b

22. How do you balance redox rxns?

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23. 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?
-l to +l
Mass number stays the same but the atomic number increases
1000
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect

24. How do you find 'g' from Newton's law of gravity?
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
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
Going from solid to gas phase
The path is longer on the inclined plane so it will take object longer to reach the bottom

25. Thus is Zn (which has positive oxidation potential) reacts with HCl - will any rxn take place?
Add them together
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
Red
Isolating an atom from minerals by decomposing the minerals with an electric current

26. The range of pH in which a color change takes place in a titration depends on what?
When HIn is turned into In- - which is dependent upon the pKa of the indicator
Polar
W = F(displacement)
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

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

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28. What is the equation for pressure?
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
Density (gravitational constant) height
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
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c

29. In Bohr model of atom when is energy emitted?
It will be reduced the voltage produced by the resistor which means IR; E- IR
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
When electron falls from high energy to low energy level
The force along the board to the normal force

30. What is weight equal to?
Accelerated by a higher voltage between the cathode and anode
They are directly proportional
Mg
Force times the distance over which the force acts

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

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32. Neither N2 or O2 have a permanent what? What does this mean?
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
Red
When electron falls from high energy to low energy level
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces

33. Beta decay is the same as what?
B = pVg; density
Positron emission
Strong acid and strong base/ weak acid and weak base
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors

34. The coefficient of static friction is the ratio of what?
The force along the board to the normal force
That it is negative
3+
Ease of polarizability of the molecule and thus increasing molecular weight of mass

35. A cmpd with the lowest carbon to oxygen ratio will require how much oxygen for combustion?
It's weight = mg; the work would be the weight times the distance fell
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio
A saturated solution in which the aqueous ions are in equilibrium with the solid
One mole of electric charge

36. For a given flow rate - the speed of fluid flow is inversely proportional to what?
The cross-sectional area through which the fluid flows
V/m or N/C
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
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles

37. In order to increase the kinetic energy of electrons - they must be what?
B = pVg; density
F = GMm/r^2
Accelerated by a higher voltage between the cathode and anode
A constant force on a mass causes it to have a constant acceleration

38. Pressure in a liquid is proportional to what? So why does this explain why blood pressure is greater in legs?
The buoyant force on it; W = mg = pVg
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
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
Electron shell number

39. if lead is successively preciptated as PbSO4 - PbI - and PbCO2 - which is less soluble than which? Thus which anions will be precipitated first?
Sp^3
[A]^a[B]^b
1) Young's Modulus 2) Shear Modulus 3) Bulk Modulus
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4

40. 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?
You look at what is being oxidized and reduced in the problem
Add them together
0 Hz because they are traveling side by side at the same speed
Total internal reflection

41. 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
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
It will be reduced the voltage produced by the resistor which means IR; E- IR
H has a small atomic radius

42. What type of acid and base would produce a pH closest to 7?
180 degrees; when there is half a wave distance in phase between two waves
Strong acid and strong base/ weak acid and weak base
The lowest whole number ratio of moles of each element in a mole of a cmpd
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

43. In a galvanic and electrolytic cell - reduction of an ion occurs where? Oxidation of an ion occurs where?
It will increase as well because they are directly related - only if pressure is kept constant
Its intensity in the spectrum
Pascal (N*m^2)
Cathode; anode

44. The free energy change (G) must be negative when what?
H = negative and S = positive
T = (2h/g)^1/2; distance = vt
It can absorb light that lets other electrons fill those orbitals
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c

45. What is sublimation?
L = wavelength/2 so L= (wavelength)(2)
Gravity
Going from solid to gas phase
Electron shell number

46. Friction is caused by what?
180 degrees; when there is half a wave distance in phase between two waves
Attractive molecular forces acting between material surfaces in contact
H = negative and S = positive
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

47. If you are given density and volume how do you find mass?
When you have central atom with six ions on it
(density[p])(volume)
When all the external forces = zero
NO; reduction-oxidation

48. What is the equation for work done?
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)
At an equal distance behind it as the object is in front of the mirror
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
W = F(displacement)

49. Acetic acid is a ______ solvent
It can absorb light that lets other electrons fill those orbitals
Mv = mv
Mass number stays the same but the atomic number increases
Polar

50. When looking at which combo of acids and bases will result in a solution with pH of 7 what do we look for?
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
A saturated solution in which the aqueous ions are in equilibrium with the solid
Positive
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