Test your basic knowledge |

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. Mechanical waves in a medium fxn to transport what?
Energy
They increase because you hear a lower frequency
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
Positive

2. How do you find specific gravity of an object?
Red
[S][2S]^2 = 4S^3
Colligative: it depends on the number of solute molecules in a given volume of water
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

3. What is the formula for the power supplied by a battery to accelerate an electron beam?
P = IV
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
The force along the board to the normal force
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4

4. What is different between an inclined plane and free fall?
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
Voltage
A salt and water
The path is longer on the inclined plane so it will take object longer to reach the bottom

5. 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?
0 Hz because they are traveling side by side at the same speed
Its momentum is zero because velocity is zero; zero because of conservation of momentum
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
7 always!!!

6. 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?
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
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
Positron because this is known as positron decay/electron capture
The density of the water and volume of the lead object

7. The free energy change (G) must be negative when what?
H = negative and S = positive
One that has more solute particles per liter of solution
Strong acid and strong base/ weak acid and weak base
(+)

8. 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?
From peak to peak
Mv = mv
Colligative: it depends on the number of solute molecules in a given volume of water
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect

9. Beta decay is the same as what?
Positron emission
Where an event took place
P = IV
Alkali metals = first column

10. What is a metathesis rxn?
The volume of the ice cube or whatever it is
That of static friction; there is a net accelerating force on the block once it starts to slide
P = IV
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

11. An alpha particle can also be assumed to be what element? What is the mass number of Helium?
How strong a base is
Helium; 4
Pascal (N*m^2)
When HIn is turned into In- - which is dependent upon the pKa of the indicator

12. The phase difference corresponding to a half wave is what? When do you get destructive interference?
The element's mass number
180 degrees; when there is half a wave distance in phase between two waves
Positive
H has a small atomic radius

13. Strength of dispersion force increases with what?
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure
How strong a base is
[S][2S]^2 = 4S^3
Ease of polarizability of the molecule and thus increasing molecular weight of mass

14. How do you find moles of a substance when you are given faradays and electrons?
F = GMm/r^2
The mass number stays the number but the atomic number decreases by one - usually resulting in another element
H has a small atomic radius
Faraday/electrons

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

16. How do you balance redox rxns?

17. When the source of a sound is flying away from you what happens to the wavelengths from peak to peak?
The volume of the ice cube or whatever it is
They increase because you hear a lower frequency
The lowest whole number ratio of moles of each element in a mole of a cmpd
Alkali metals = first column

18. What is the equation for work done?
W = F(displacement)
Going from solid to gas phase
Its momentum is zero because velocity is zero; zero because of conservation of momentum
L = wavelength/2 so L= (wavelength)(2)

19. What gas is evolved when copper is placed in a nitric acid (HNO3) solution? This is what type of rxn?
You look at what is being oxidized and reduced in the problem
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)
NO; reduction-oxidation
They do not differ

20. 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?

21. What is the equation for a period (T)? What is the equation for angular velocity?
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
T = 2pi/angular velocity; v/r
F =ma and F= qE
7 always!!!

22. A floating ice cube implies that it's weight is balanced by what?
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
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant
The buoyant force on it; W = mg = pVg

23. What is one faraday equal to?
One mole of electric charge
A salt 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
They must balance

24. How do you find wavelength if you known distance from adjacent crests and troughs?
It's weight = mg; the work would be the weight times the distance fell
Density (gravitational constant) height
Its twice that distance
That of static friction; there is a net accelerating force on the block once it starts to slide

25. 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?

26. Neither N2 or O2 have a permanent what? What does this mean?
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces
Polar
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
Helium; 4

27. 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?
Mag and direction
Add them together
H has a small atomic radius
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

28. When does red litmus paper turn blue?
In the presence of a base
P = IV
Its intensity in the spectrum
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure

29. What is the equation for pressure?
Decreasing potential energy
They must balance
Density (gravitational constant) height
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure

30. The force on an electrical charge is what?
Zero
Mg
F =ma and F= qE
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

31. 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
E = (kq)/r^2
7 always!!!
They do not differ

32. What is the net result on a nucleus when you absorb a deuturon and emit a neutron?
One that has more solute particles per liter of solution
Momentum
The nucleus gains a proton and no neutrons
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors

33. What is Avagadro's number regarding ions/mol?
6.02 x 10^23 ions/mol
Helium; 4
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
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

34. Pressure in a liquid is proportional to what? So why does this explain why blood pressure is greater in legs?
Colligative: it depends on the number of solute molecules in a given volume of water
Total internal reflection
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
(+)

35. Can a charged particle be detected by two anodes?

36. Beta decay is the emission of what? How do you know what it is the emission of?
Shorter than it should be so rays from a distant object form in front of retina; use divergent lens
A positron or electron; when atomic number goes up you know an electron has been emitted
Colligative; the number of solute particles present
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water

37. If both weight and bouyant force are dependent on g - that makes g independent of what?
H = negative and S = positive
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
The volume of the ice cube or whatever it is

38. Isotopes have diff number of ______ but same what?
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
Attractive molecular forces acting between material surfaces in contact
Neutrons; atomic number
7 always!!!

39. The coefficient of static friction is the ratio of what?
External components of the circuit
When all the external forces = zero
The force along the board to the normal force
The mass number stays the number but the atomic number decreases by one - usually resulting in another element

40. Why would a solution with unfilled orbitals be responsible for turning a solution a certian color?
Zero
7 always!!!
It can absorb light that lets other electrons fill those orbitals
Faraday/electrons

41. Why does light travel slower in an optically dense medium than through a vacuum?
H = negative and S = positive
It's weight = mg; h
1) Young's Modulus 2) Shear Modulus 3) Bulk Modulus
Light is absorbed and re-emitted by the atomic structure of the optically dense medium

42. How do you find what is the limiting reagent? You can then use the moles of the limiting reagent to calculate what?
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
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
Voltage
F =ma and F= qE

43. Light can be carried along a distance within a transparent material by means of what?
T = (2h/g)^1/2; distance = vt
Mv = mv
The lowest one
Total internal reflection

44. The range of pH in which a color change takes place in a titration depends on what?
You look at what is being oxidized and reduced in the problem
When HIn is turned into In- - which is dependent upon the pKa of the indicator
Mass number stays the same but the atomic number increases
P = F(v) = mg(v -terminal)

45. What is the magnitude of the electric field produced by a point charge?
E = (kq)/r^2
The volume of the ice cube or whatever it is
Momentum
Zero

46. Always remember that velocity has ____ and ____
It can also equal 'mg'; the compressive strength of a substance
Mag and direction
F = GMm/r^2
The lowest one

47. When you are trying to calculate a galvanic cell's emf - what do you look at?
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
Force times the distance over which the force acts
You look at what is being oxidized and reduced in the problem
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces

48. 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?
External components of the circuit
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
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
0 Hz because they are traveling side by side at the same speed

49. 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?
[A]^a[B]^b
W = F(displacement)
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
In the presence of a base

50. The Ksp for a substance of AaBb is what?
H has a small atomic radius
Faraday/electrons
[A]^a[B]^b
The particle's charge and the magnitude of the electric field