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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. Can a charged particle be detected by two anodes?

2. An alpha particle can also be assumed to be what element? What is the mass number of Helium?
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting
Vertically; perpendicular to all surfaces
It's weight = mg; h
Helium; 4

3. The coefficient of kinetic friction is always lower than what? Therefore what?
That of static friction; there is a net accelerating force on the block once it starts to slide
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant
Vertically; perpendicular to all surfaces
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles

4. The closer the spacing of the anode wire - the better one can specify what?
7 always!!!
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect
Voltage
Where an event took place

5. How would you find rate of rxn from pH 1 to pH2?
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
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
Its twice that distance
That of static friction; there is a net accelerating force on the block once it starts to slide

6. What is usually conserved over oscillation periods?
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
Energy
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect
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

7. When you are trying to calculate a galvanic cell's emf - what do you look at?
It experiences a constant electric force of qE and will thus accelerate towards the positive plate
H = negative and S = positive
Ability to locate an event in space
You look at what is being oxidized and reduced in the problem

8. What gas is evolved when copper is placed in a nitric acid (HNO3) solution? This is what type of rxn?
E = (kq)/r^2
Strong acid and strong base/ weak acid and weak base
NO; reduction-oxidation
When all the external forces = zero

9. What is the equation for a period (T)? What is the equation for angular velocity?
It has a positive oxidation potential so it is easily oxidized
They increase because you hear a lower frequency
Polar
T = 2pi/angular velocity; v/r

10. The Ksp for a substance of AaBb is what?
F = GMm/r^2
The volume of the ice cube or whatever it is
[A]^a[B]^b
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

11. 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?
Red
Neutrons; atomic number
(+)
The lowest one

12. Strength of dispersion force increases with what?
The mass number stays the number but the atomic number decreases by one - usually resulting in another element
Ease of polarizability of the molecule and thus increasing molecular weight of mass
They are directly proportional
Alkali metals = first column

13. Is the work done by air resistance - positive or negative?
F =ma and F= qE
The lowest whole number ratio of moles of each element in a mole of a cmpd
Negative
That they are catalysts in the rxn because they react with the substrate and are reformed

14. if lead is successively preciptated as PbSO4 - PbI - and PbCO2 - which is less soluble than which? Thus which anions will be precipitated first?
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
W = F(displacement)
Vertically; perpendicular to all surfaces
Total internal reflection

15. A nearsighted person has what type of focal length? Thus what do we do to correct this?
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
Going from solid to gas phase
Red
Shorter than it should be so rays from a distant object form in front of retina; use divergent lens

16. What is different between an inclined plane and free fall?
Mv = mv
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous
The path is longer on the inclined plane so it will take object longer to reach the bottom

17. If temperature arises during a mixture what can you conclude about the enthalpy?
That it is negative
Mg
The element's mass number
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

18. Equivalent mass is what?
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
Its intensity in the spectrum
Mg
One that has more solute particles per liter of solution

19. Pressure in a liquid is proportional to what? So why does this explain why blood pressure is greater in legs?
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
Shorter than it should be so rays from a distant object form in front of retina; use divergent lens
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
-l to +l

20. If melting pt of a substance is 80 degrees - then what is the diff in time the substance melts when it is either placed in 100 degree test tube and 90 degree test tube?
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
They are directly proportional
In the presence of a base
The volume of the ice cube or whatever it is

21. Does the temperature of a water bath or amount of water in a water bath determines if a substance melts?
Voltage
Total internal reflection
Only temperature of the water bath
It will be reduced the voltage produced by the resistor which means IR; E- IR

22. 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?

23. 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?
Shorter than it should be so rays from a distant object form in front of retina; use divergent lens
0 Hz because they are traveling side by side at the same speed
H has a small atomic radius
H = negative and S = positive

24. Why does light travel slower in an optically dense medium than through a vacuum?
No - it increases the speed at which the rxn reaches that equilibrium
Positive
Mg
Light is absorbed and re-emitted by the atomic structure of the optically dense medium

25. When an element decreases its atomic number by one what is emitted?
It will be reduced the voltage produced by the resistor which means IR; E- IR
No - it increases the speed at which the rxn reaches that equilibrium
Positron because this is known as positron decay/electron capture
[A]^a[B]^b

26. In Bohr model of atom when is energy 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
Force times the distance over which the force acts
When electron falls from high energy to low energy level

27. If asked which electron configuration of an element is most stable which one do you choose?
The regular one
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
[S][2S]^2 = 4S^3
They do not differ

28. In order to guarantee a non-zero spin how many electrons are needed?
Density (gravitational constant) height
An odd number
A salt and water
T = 2pi/angular velocity; v/r

29. The probability of an X-ray emission event at a given wavelength is measured by what?
Its intensity in the spectrum
3+
Its momentum is zero because velocity is zero; zero because of conservation of momentum
Gravity

30. What kind of metals react violently with water?
Going from solid to gas phase
E = (kq)/r^2
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
Alkali metals = first column

31. 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
-l to +l
It can absorb light that lets other electrons fill those orbitals
H has a small atomic radius

32. The boiling point of a solution is what type of property? Which means is depends only on what?
Zero
Colligative; the number of solute particles present
Alkali metals = first column
One mole of electric charge

33. When a falling mass is at terminal speed - what is the power expended by the air resistance?
P = F(v) = mg(v -terminal)
3+
Neutrons; atomic number
Energy

34. 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?
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio
Add them together
T = 2pi/angular velocity; v/r
Only temperature of the water bath

35. What color is above 656 nm?
Add them together
Red
Momentum
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

36. What does spatial resolution refer to?
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles
When you have central atom with six ions on it
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
Ability to locate an event in space

37. What type of acid and base would produce a pH closest to 7?
Momentum
Where an event took place
No - it increases the speed at which the rxn reaches that equilibrium
Strong acid and strong base/ weak acid and weak base

38. How do the final velocities differ if a sphere is dropped from a distance rather than rolled down an inclined plane?
An odd number
The regular one
They do not differ
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

39. Why would a solution with unfilled orbitals be responsible for turning a solution a certian color?
It will be reduced the voltage produced by the resistor which means IR; E- IR
The path is longer on the inclined plane so it will take object longer to reach the bottom
It will increase as well because they are directly related - only if pressure is kept constant
It can absorb light that lets other electrons fill those orbitals

40. The free energy change (G) must be negative when what?
H = negative and S = positive
It has a positive oxidation potential so it is easily oxidized
It can absorb light that lets other electrons fill those orbitals
You look at what is being oxidized and reduced in the problem

41. A floating ice cube implies that it's weight is balanced by what?
The cross-sectional area through which the fluid flows
It's weight = mg; the work would be the weight times the distance fell
At an equal distance behind it as the object is in front of the mirror
The buoyant force on it; W = mg = pVg

42. 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?
At an equal distance behind it as the object is in front of the mirror
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
Constant to overcome the heat of fusion (solid to liquid state)
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

43. 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?
One that has more solute particles per liter of solution
Its intensity in the spectrum
The particle's charge and the magnitude of the electric field
It will be reduced the voltage produced by the resistor which means IR; E- IR

44. In PV=nRT - if temp increases what will happen to volume?
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water
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
400 to 700 nm
It will increase as well because they are directly related - only if pressure is kept constant

45. What are the units of an electric field?
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
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
H = negative and S = positive
V/m or N/C

46. The force on an electrical charge is what?
That it is negative
They are directly proportional
F =ma and F= qE
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

47. What do electrolytic techniques involve?
In the presence of a base
One that has more solute particles per liter of solution
Isolating an atom from minerals by decomposing the minerals with an electric current
From peak to peak

48. 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
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
V/m or N/C
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R

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

50. 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?
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
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure
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 HIn is turned into In- - which is dependent upon the pKa of the indicator