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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. Thus is Zn (which has positive oxidation potential) reacts with HCl - will any rxn take place?
That it is negative
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
+/- 1/2

2. Friction is caused by what?
Attractive molecular forces acting between material surfaces in contact
P = F(v) = mg(v -terminal)
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
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant

3. F in the Young's modulus equation can also equal what? What is E?

4. What gas is evolved when copper is placed in a nitric acid (HNO3) solution? This is what type of rxn?
NO; reduction-oxidation
Neutrons; atomic number
One mole of electric charge
Vertically; perpendicular to all surfaces

5. Beta decay is the same as what?
+/- 1/2
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant
Positron emission
It experiences a constant electric force of qE and will thus accelerate towards the positive plate

6. Strength of dispersion force increases with what?
It decreases; the work done by the gas in expanding decreases its internal energy
They do not differ
Ease of polarizability of the molecule and thus increasing molecular weight of mass
Red

7. If asked which electron configuration of an element is most stable which one do you choose?
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
The regular one
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)
1) Young's Modulus 2) Shear Modulus 3) Bulk Modulus

8. The Ksp for a substance of AaBb is what?
-l to +l
[A]^a[B]^b
3+
[S][2S]^2 = 4S^3

9. The visible spectrum ranges from ____ to _____
400 to 700 nm
Cathode; anode
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 buoyant force on it; W = mg = pVg

10. 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?
0 Hz because they are traveling side by side at the same speed
Total internal reflection
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 height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)

11. The electrons emitted from cathode are replaced with what?
The cross-sectional area through which the fluid flows
It's weight = mg; h
Electrons from anode and battery
The reaction between the base and water

12. What are the units of an electric field?
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
V/m or N/C
An odd 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

13. What color is above 656 nm?
Vertically; perpendicular to all surfaces
They are directly proportional
Red
An odd number

14. What direction do gravity and bouyancy work? What direction does water pressure work?
Vertically; perpendicular to all surfaces
When electron falls from high energy to low energy level
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
(+)

15. When the source of a sound is flying away from you what happens to the wavelengths from peak to peak?
It has a positive oxidation potential so it is easily oxidized
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
L = wavelength/2 so L= (wavelength)(2)
They increase because you hear a lower frequency

16. 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?

17. The volume of an object is equal to water?
Liquid displaced by that object
Vertically; perpendicular to all surfaces
A saturated solution in which the aqueous ions are in equilibrium with the solid
E = (kq)/r^2

18. Why is it important that the materials used as scintillators are nearly transparent to the wavelength of light they emit?
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
Force times the distance over which the force acts
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 buoyant force on it; W = mg = pVg

19. If you have an alcohol with OH on the end and then another cmpd with an O in the middle but no H - what is different between the bonds they can make with water?

20. Isotopes have diff number of ______ but same what?
They do not differ
Neutrons; atomic number
F =ma and F= qE
It has a positive oxidation potential so it is easily oxidized

21. If any species is gotten rid of when combining two equations of chemical rxns together what can you conclude about those species?
That they are catalysts in the rxn because they react with the substrate and are reformed
A saturated solution in which the aqueous ions are in equilibrium with the solid
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
Ability to locate an event in space

22. A cmpd with the lowest carbon to oxygen ratio will require how much oxygen for combustion?
L = wavelength/2 so L= (wavelength)(2)
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
B = pVg; density
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio

23. What does spatial resolution refer to?
Voltage
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
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
Ability to locate an event in space

24. In a galvanic and electrolytic cell - reduction of an ion occurs where? Oxidation of an ion occurs where?
Electron shell number
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
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
Cathode; anode

25. What is the unit for Young's Modulus?
Pascal (N*m^2)
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
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water

26. 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?
F = GMm/r^2
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
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
It experiences a constant electric force of qE and will thus accelerate towards the positive plate

27. Hydrogen has what kind of standard oxidation or reduction potential?
It can also equal 'mg'; the compressive strength of a substance
Zero
It experiences a constant electric force of qE and will thus accelerate towards the positive plate
A saturated solution in which the aqueous ions are in equilibrium with the solid

28. The force on an electrical charge is what?
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
[A]^a[B]^b
(+)
F =ma and F= qE

29. What do electrolytic techniques involve?
6.02 x 10^23 ions/mol
They increase because you hear a lower frequency
The mass number stays the number but the atomic number decreases by one - usually resulting in another element
Isolating an atom from minerals by decomposing the minerals with an electric current

30. If you have longer wavelengths how is their freq and energy compared to shorter wavelengths?
The current is the same
Half of the exponent
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R

31. 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?
At an equal distance behind it as the object is in front of the mirror
E = (kq)/r^2
Its momentum is zero because velocity is zero; zero because of conservation of momentum
The buoyant force on it; W = mg = pVg

32. What is the equation for a period (T)? What is the equation for angular velocity?
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure
That it is negative
It can absorb light that lets other electrons fill those orbitals
T = 2pi/angular velocity; v/r

33. What is different between an inclined plane and free fall?
Positron because this is known as positron decay/electron capture
The path is longer on the inclined plane so it will take object longer to reach the bottom
+/- 1/2
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

34. What is the equation for bouyant force? What is p?
They do not differ
Ability to locate an event in space
From peak to peak
B = pVg; density

35. In Bohr model of atom when is energy emitted?
400 to 700 nm
A constant force on a mass causes it to have a constant acceleration
When electron falls from high energy to low energy level
The force along the board to the normal force

36. How many mL is in one liter?
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
NO; reduction-oxidation
Constant to overcome the heat of fusion (solid to liquid state)
1000

37. What is weight equal to?
Mg
Its intensity in the spectrum
A saturated solution in which the aqueous ions are in equilibrium with the solid
Attractive molecular forces acting between material surfaces in contact

38. How do the final velocities differ if a sphere is dropped from a distance rather than rolled down an inclined plane?
They do not differ
Zero
It can absorb light that lets other electrons fill those orbitals
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

39. The closer the spacing of the anode wire - the better one can specify what?
Where an event took place
Decreasing potential energy
Sp^3
H = negative and S = positive

40. How do you find length of time something is in flight? How do you find distance it traveled?
[A]^a[B]^b
Positron emission
T = (2h/g)^1/2; distance = vt
In the presence of a base

41. What is the principal quantum number (n)?
The lowest one
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
Electron shell number

42. The coefficient of static friction is the ratio of what?
Only temperature of the water bath
It can absorb light that lets other electrons fill those orbitals
The force along the board to the normal force
Cathode; anode

43. How would you find rate of rxn from pH 1 to pH2?
Mv = mv
At an equal distance behind it as the object is in front of the mirror
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
Add them together

44. What is the equation for work done?
Colligative; the number of solute particles present
Ability to locate an event in space
Mass number stays the same but the atomic number increases
W = F(displacement)

45. The freezing point of an aqueous solution is what kind of property? What does this mean?
Half of the exponent
Colligative: it depends on the number of solute molecules in a given volume of water
They must balance
Colligative; the number of solute particles present

46. 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
Half of the exponent
Vertically; perpendicular to all surfaces
It can also equal 'mg'; the compressive strength of a substance

47. What is the equation for pressure?
H = negative and S = positive
Density (gravitational constant) height
Colligative: it depends on the number of solute molecules in a given volume of water
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces

48. 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
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
Vertically; perpendicular to all surfaces
External components of the circuit

49. What is usually conserved over oscillation periods?
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
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio
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

50. 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?
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
7 always!!!
Mag and direction