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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 looking at which combo of acids and bases will result in a solution with pH of 7 what do we look for?
Helium; 4
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
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
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

2. 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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3. If temperature arises during a mixture what can you conclude about the enthalpy?
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
P = F(v) = mg(v -terminal)
Only temperature of the water bath
That it is negative

4. What is the unit for Young's Modulus?
They are directly proportional
Positron emission
Pascal (N*m^2)
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio

5. Neither N2 or O2 have a permanent what? What does this mean?
-l to +l
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces
Faraday/electrons
Pascal (N*m^2)

6. How do you find what is the limiting reagent? You can then use the moles of the limiting reagent to calculate what?
The lowest one
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
Ability to locate an event in space
Faraday/electrons

7. How should the period of a waveform be calculated?
From peak to peak
7 always!!!
It decreases; the work done by the gas in expanding decreases its internal energy
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure

8. The range of pH in which a color change takes place in a titration depends on what?
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
Gravity
[S][2S]^2 = 4S^3
When HIn is turned into In- - which is dependent upon the pKa of the indicator

9. Pressure in a liquid is proportional to what? So why does this explain why blood pressure is greater in legs?
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
It can absorb light that lets other electrons fill those orbitals
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)

10. The boiling point of a solution is what type of property? Which means is depends only on what?
An odd number
Neutrons; atomic number
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
Colligative; the number of solute particles present

11. The force on an electrical charge is what?
+/- 1/2
F =ma and F= qE
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect
Helium; 4

12. How do the final velocities differ if a sphere is dropped from a distance rather than rolled down an inclined plane?
400 to 700 nm
It's weight = mg; the work would be the weight times the distance fell
They do not differ
It decreases; the work done by the gas in expanding decreases its internal energy

13. How do you find length of time something is in flight? How do you find distance it traveled?
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
T = (2h/g)^1/2; distance = vt
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles
Positive

14. The probability of an X-ray emission event at a given wavelength is measured by what?
Its intensity in the spectrum
(density[p])(volume)
Positron because this is known as positron decay/electron capture
When electron falls from high energy to low energy level

15. In Bohr model of atom when is energy emitted?
(density[p])(volume)
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
Mag and direction
When electron falls from high energy to low energy level

16. What is usually conserved over oscillation periods?
They do not differ
Force times the distance over which the force acts
Faraday/electrons
Energy

17. Melting occurs at what type of temperature? Why?
The volume of the ice cube or whatever it is
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
Constant to overcome the heat of fusion (solid to liquid state)
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)

18. What kind of charge is on Al?
NO; reduction-oxidation
W = F(displacement)
3+
H = negative and S = positive

19. What energy conversion describes best what takes place in a battery-powered resistive circuit?
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio
Mg
It experiences a constant electric force of qE and will thus accelerate towards the positive plate
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors

20. What are the units of an electric field?
Mass number stays the same but the atomic number increases
V/m or N/C
Ability to locate an event in space
7 always!!!

21. If the source of sound and the listener are traveling side by side at the same speed - what will the change in freq heard by the listener be?
Alkali metals = first column
It experiences a constant electric force of qE and will thus accelerate towards the positive plate
Mg
0 Hz because they are traveling side by side at the same speed

22. What kind of metals react violently with water?
Alkali metals = first column
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous
The volume of the ice cube or whatever it is
The particle's charge and the magnitude of the electric field

23. Equivalent mass is what?
Alkali metals = first column
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
You look at what is being oxidized and reduced in the problem
Momentum

24. Mechanical waves in a medium fxn to transport what?
External components of the circuit
Energy
The reaction between the base and water
They do not differ

25. What is conserved in an inellastic collision?
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
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
Momentum
It's weight = mg; h

26. Half-sine wave shape is what kind of wavelength with regards to length?
L = wavelength/2 so L= (wavelength)(2)
The regular one
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
W = F(displacement)

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

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28. Considering the answer in the last slide - what kind of a solution would have a lower freezing pt?
NO; reduction-oxidation
Momentum
The particle's charge and the magnitude of the electric field
One that has more solute particles per liter of solution

29. Kb is the equilibrium constant for what?
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect
0 Hz because they are traveling side by side at the same speed
The reaction between the base and water
It has a positive oxidation potential so it is easily oxidized

30. The number of incident photons on the cathode affect what?
The mass number stays the number but the atomic number decreases by one - usually resulting in another element
The number of electrons emitted
In the presence of a base
The path is longer on the inclined plane so it will take object longer to reach the bottom

31. Light can be carried along a distance within a transparent material by means of what?
(density[p])(volume)
A salt and water
Total internal reflection
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

32. What is the equation for work done?
W = F(displacement)
The number of electrons emitted
When all the external forces = zero
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect

33. In a rxn - how do you figure out which atom has the highest electron affinity?
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
F =ma and F= qE
The density of the water and volume of the lead object
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

34. What does the empirical formula show?
It has a positive oxidation potential so it is easily oxidized
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio
It will increase as well because they are directly related - only if pressure is kept constant
The lowest whole number ratio of moles of each element in a mole of a cmpd

35. The basicity constant Kb measures what?
How strong a base is
The buoyant force on it; W = mg = pVg
No - it increases the speed at which the rxn reaches that equilibrium
B = pVg; density

36. if lead is successively preciptated as PbSO4 - PbI - and PbCO2 - which is less soluble than which? Thus which anions will be precipitated first?
Constant to overcome the heat of fusion (solid to liquid state)
Total internal reflection
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
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

37. What is Newton's Universal Law of Gravitation?
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water
Zero
F = GMm/r^2
L = wavelength/2 so L= (wavelength)(2)

38. So if you have a voltage of 1/4V it will be reduced by what? Thus what will be the equation for the terminal voltage?
You look at what is being oxidized and reduced in the problem
Negative
That it is negative
It will be reduced the voltage produced by the resistor which means IR; E- IR

39. What is the formula for the power supplied by a battery to accelerate an electron beam?
Pascal (N*m^2)
P = IV
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
An odd number

40. What is the equation for bouyant force? What is p?
You look at what is being oxidized and reduced in the problem
Zero
0 Hz because they are traveling side by side at the same speed
B = pVg; density

41. In radioactive decay the atomic number (A) and mass number (Z) must what?
Ease of polarizability of the molecule and thus increasing molecular weight of mass
Going from solid to gas phase
180 degrees; when there is half a wave distance in phase between two waves
They must balance

42. The visible spectrum ranges from ____ to _____
Positive
That they are catalysts in the rxn because they react with the substrate and are reformed
400 to 700 nm
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c

43. Why are bonds between H and another atom shorter compared to most?
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water
P = F(v) = mg(v -terminal)
A constant force on a mass causes it to have a constant acceleration
H has a small atomic radius

44. 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
180 degrees; when there is half a wave distance in phase between two waves
Strong acid and strong base/ weak acid and weak base
You look at what is being oxidized and reduced in the problem

45. What kind of geometry is octahedral?
When you have central atom with six ions on it
It's weight = mg; h
They must balance
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

46. The equivalence pt is what part of the titration curve? Thus looking at the range of change between the pH values along this part of the graph can tell you what?

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

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48. 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?
The density of the water and volume of the lead object
One mole of electric charge
7 always!!!
Light is absorbed and re-emitted by the atomic structure of the optically dense medium

49. What is the relationship between P and n in PV=nRT?
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles
They are directly proportional
An odd number
Its intensity in the spectrum

50. What gas is evolved when copper is placed in a nitric acid (HNO3) solution? This is what type of rxn?
-l to +l
It can also equal 'mg'; the compressive strength of a substance
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
NO; reduction-oxidation