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. The visible spectrum ranges from ____ to _____
The element's mass number
How strong a base is
Neutrons; atomic number
400 to 700 nm

2. What is the hybridization of oxygen in water and other oxygens similar to water with two bonds and two lone pairs of electrons?
Sp^3
Positive
It's weight = mg; h
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. 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?
Accelerated by a higher voltage between the cathode and anode
(+)
Isolating an atom from minerals by decomposing the minerals with an electric current
Energy

4. How do you find 'g' from Newton's law of gravity?
Voltage
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
The regular one
Ability to locate an event in space

5. When a falling mass is at terminal speed - what is the power expended by the air resistance?
Gravity
P = IV
P = F(v) = mg(v -terminal)
NO; reduction-oxidation

6. The freezing point of an aqueous solution is what kind of property? What does this mean?
Colligative: it depends on the number of solute molecules in a given volume of water
The reaction between the base and water
Mag and direction
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed

7. The phase difference corresponding to a half wave is what? When do you get destructive interference?
Faraday/electrons
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14
When electron falls from high energy to low energy level
180 degrees; when there is half a wave distance in phase between two waves

8. If you have longer wavelengths how is their freq and energy compared to shorter wavelengths?
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
Density (gravitational constant) height
Ease of polarizability of the molecule and thus increasing molecular weight of mass
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous

9. What is conserved in an inellastic collision?
Mass number stays the same but the atomic number increases
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
The current is the same
Momentum

10. Terminal voltage is provided to what?
External components of the circuit
Sp^3
Mag and direction
The lowest one

11. When does red litmus paper turn blue?
In the presence of a base
F = GMm/r^2
Neutrons; atomic number
The volume of the ice cube or whatever it is

12. What is the equation for bouyant force? What is p?
The regular one
A salt and water
B = pVg; density
Where an event took place

13. What is the equation for a period (T)? What is the equation for angular velocity?
T = 2pi/angular velocity; v/r
No - it increases the speed at which the rxn reaches that equilibrium
Momentum
An odd number

14. What is one faraday equal to?
Faraday/electrons
One mole of electric charge
6.02 x 10^23 ions/mol
Zero

15. The temperature of a metal will not increase above its melting point until what?
P = IV
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)
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting

16. What type of acid and base would produce a pH closest to 7?
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
1000
Strong acid and strong base/ weak acid and weak base
The number of electrons emitted

17. Charged particles in motion constitute what? Freely moving charges are deflected by what? The curved path depends on what?
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
180 degrees; when there is half a wave distance in phase between two waves
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
1) Young's Modulus 2) Shear Modulus 3) Bulk Modulus

18. A cmpd with the lowest carbon to oxygen ratio will require how much oxygen for combustion?
You look at what is being oxidized and reduced in the problem
That they are catalysts in the rxn because they react with the substrate and are reformed
The nucleus gains a proton and no neutrons
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio

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

20. The boiling point of a solution is what type of property? Which means is depends only on what?
Colligative; the number of solute particles present
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
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
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R

21. The total pressure of a solution is what? Give example.
Electron shell number
Mass number stays the same but the atomic number increases
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
The number of electrons emitted

22. If any species is gotten rid of when combining two equations of chemical rxns together what can you conclude about those species?
Alkali metals = first column
Cathode; anode
That they are catalysts in the rxn because they react with the substrate and are reformed
That of static friction; there is a net accelerating force on the block once it starts to slide

23. What energy conversion describes best what takes place in a battery-powered resistive circuit?
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
That they are catalysts in the rxn because they react with the substrate and are reformed
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting
Mg

24. The concentration of OH and H30 ions are approximately equal at what pH?
-l to +l
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
An odd number
7 always!!!

25. What is weight equal to?
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
The cross-sectional area through which the fluid flows
Its momentum is zero because velocity is zero; zero because of conservation of momentum
Mg

26. 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?

27. What would the force be of a block on a pulley? What would be its displacement?

28. What happens to the atomic number and atomic mass of an element that go under Beta decay or positron emission?
7 always!!!
Mass number stays the same but the atomic number increases
The cross-sectional area through which the fluid flows
Faraday/electrons

29. 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 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
They must balance
From peak to peak
The density of the water and volume of the lead object

30. The electrons emitted from cathode are replaced with what?
Yes - if the particle's trail is equidistant between two adjacent anodes
3+
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces
Electrons from anode and battery

31. Light can be carried along a distance within a transparent material by means of what?
Total internal reflection
Its twice that distance
Well F = GmM/R^2 and force = mg so equating those together g = GM/R^2
The number of electrons emitted

32. What are the units of an electric field?
Positive
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect
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
V/m or N/C

33. What does spatial resolution refer to?
C: series = 1/C + 1/C = 1/C; parallel = C + C = C R: series: R+R = R; parallel = 1/R + 1/R = 1/R
Mv = mv
6.02 x 10^23 ions/mol
Ability to locate an event in space

34. In order to guarantee a non-zero spin how many electrons are needed?
An odd number
It can also equal 'mg'; the compressive strength of a substance
Going from solid to gas phase
[A]^a[B]^b

35. The coefficient of static friction is the ratio of what?
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces
A constant force on a mass causes it to have a constant acceleration
The force along the board to the normal force
Helium; 4

36. A pendulum moves under the influence of what?
Half of the exponent
Only temperature of the water bath
Gravity
-l to +l

37. The square root of 10^anything is equal to what?
External components of the circuit
Half of the exponent
Polar
The current is the same

38. Regarding M(OH)2 and you have solubility (S) - what would the Ksp be?
Its momentum is zero because velocity is zero; zero because of conservation of momentum
[S][2S]^2 = 4S^3
Helium; 4
F =ma and F= qE

39. What color is above 656 nm?
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
Red
The lowest one
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4

40. What kind of metals react violently with water?
Colligative: it depends on the number of solute molecules in a given volume of water
Alkali metals = first column
The buoyant force on it; W = mg = pVg
Decreasing potential energy

41. Beta decay is the same as what?
Positron emission
B = pVg; density
The buoyant force on it; W = mg = pVg
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed

42. What is Avagadro's number regarding ions/mol?
6.02 x 10^23 ions/mol
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
1) Young's Modulus 2) Shear Modulus 3) Bulk Modulus
A positron or electron; when atomic number goes up you know an electron has been emitted

43. What is newton's second law?
The number of electrons emitted
Only temperature of the water bath
The element's mass number
A constant force on a mass causes it to have a constant acceleration

44. Why does light travel slower in an optically dense medium than through a vacuum?
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 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
External components of the circuit
Light is absorbed and re-emitted by the atomic structure of the optically dense medium

45. 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
Cathode; anode
It decreases; the work done by the gas in expanding decreases its internal energy
(+)

46. If you have a decrease of pressure to which side of the equation is it equilibrium shifted towards? What about if you increase temperature?

47. 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?
Its momentum is zero because velocity is zero; zero because of conservation of momentum
Helium; 4
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect
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

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

49. How do the final velocities differ if a sphere is dropped from a distance rather than rolled down an inclined plane?
Gravity
It will be reduced the voltage produced by the resistor which means IR; E- IR
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
They do not differ

50. How do you find moles of a substance when you are given faradays and electrons?
That they are catalysts in the rxn because they react with the substrate and are reformed
When you have central atom with six ions on it
Faraday/electrons
Strong acid and strong base/ weak acid and weak base