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DSST Physical Sciences2

Subjects : dsst, science

Instructions:

Answer 50 questions in 15 minutes.
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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. What gas is evolved when copper is placed in a nitric acid (HNO3) solution? This is what type of rxn?
The current is the same
It can absorb light that lets other electrons fill those orbitals
NO; reduction-oxidation
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water

2. The electrical force on a particle depends on what?

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3. The coefficient of static friction is the ratio of what?
It will be reduced the voltage produced by the resistor which means IR; E- IR
Light is absorbed and re-emitted by the atomic structure of the optically dense medium
[A]^a[B]^b
The force along the board to the normal force

4. When an element decreases its atomic number by one what is emitted?
It decreases; the work done by the gas in expanding decreases its internal energy
Positron because this is known as positron decay/electron capture
In the presence of a base
At an equal distance behind it as the object is in front of the mirror

5. 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
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
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
Isolating an atom from minerals by decomposing the minerals with an electric current

6. The coefficient of kinetic friction is always lower than what? Therefore what?
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
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water
That of static friction; there is a net accelerating force on the block once it starts to slide

7. Always remember that velocity has ____ and ____
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
Constant to overcome the heat of fusion (solid to liquid state)
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio
Mag and direction

8. What is the equation for work done?
The lowest whole number ratio of moles of each element in a mole of a cmpd
A constant force on a mass causes it to have a constant acceleration
W = F(displacement)
The Ka or Kb that has an exponent closest to 7 because pKa + pKb = pKw and pKw = 14

9. What is the doppler equation for wavelength and frequency?
Cathode; anode
Mv = mv
W = F(displacement)
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c

10. What is Avagadro's number regarding ions/mol?
The particle's charge and the magnitude of the electric field
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant
6.02 x 10^23 ions/mol
A saturated solution in which the aqueous ions are in equilibrium with the solid

11. Beta decay is the same as what?
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles
Positron emission
PbCO2 is less soluble than PbI - and PbI less soluble than PbSO4; CO2 - then I - then SO4
Colligative: it depends on the number of solute molecules in a given volume of water

12. Strength of dispersion force increases with what?
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
Ease of polarizability of the molecule and thus increasing molecular weight of mass
A constant force on a mass causes it to have a constant acceleration
They do not differ

13. How do you find specific gravity of an object?
In the presence of a base
A constant force on a mass causes it to have a constant acceleration
Neutrons; atomic number
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

14. Thus is Zn (which has positive oxidation potential) reacts with HCl - will any rxn take place?
Strong acid and strong base/ weak acid and weak base
Yes because ionic zinc has oxidation of (2+) and Zn is easily oxidized so it will displace H and ZnCl2 will be formed
NO; reduction-oxidation
Energy

15. Pressure in a liquid is proportional to what? So why does this explain why blood pressure is greater in legs?
At an equal distance behind it as the object is in front of the mirror
The height of the liquid above it ; blood pressure increases because of the force of gravity (P= (density)g(height)
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

16. The boiling point of a solution is what type of property? Which means is depends only on what?
Isolating an atom from minerals by decomposing the minerals with an electric current
Alkali metals = first column
Mv = mv
Colligative; the number of solute particles present

17. What type of acid and base would produce a pH closest to 7?
The current is the same
Yes - if the particle's trail is equidistant between two adjacent anodes
Strong acid and strong base/ weak acid and weak base
P = IV

18. What kind of geometry is octahedral?
They are directly proportional
When you have central atom with six ions on it
Its intensity in the spectrum
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles

19. The volume of an object is equal to water?
That it is negative
From peak to peak
At an equal distance behind it as the object is in front of the mirror
Liquid displaced by that object

20. In order to increase the kinetic energy of electrons - they must be what?
Pascal (N*m^2)
It can absorb light that lets other electrons fill those orbitals
T = 2pi/angular velocity; v/r
Accelerated by a higher voltage between the cathode and anode

21. The temperature of a metal will not increase above its melting point until what?
Until all of it has been melted because energy is going into it to melt it not to change temperature during its melting
Zero
180 degrees; when there is half a wave distance in phase between two waves
Total internal reflection

22. What is the principal quantum number (n)?
The lowest whole number ratio of moles of each element in a mole of a cmpd
Electron shell number
The force along the board to the normal force
It's weight = mg; h

23. When the source of a sound is flying away from you what happens to the wavelengths from peak to peak?
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)
They increase because you hear a lower frequency
Energy
It's weight = mg; the work would be the weight times the distance fell

24. In general what is formed by an acid-base rxn?
In the presence of a base
+/- 1/2
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 salt and water

25. In Bohr model of atom when is energy emitted?
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio
When you have central atom with six ions on it
Positron because this is known as positron decay/electron capture
When electron falls from high energy to low energy level

26. In PV=nRT - if temp increases what will happen to volume?
A saturated solution in which the aqueous ions are in equilibrium with the solid
It will increase as well because they are directly related - only if pressure is kept constant
An odd number
1) Young's Modulus 2) Shear Modulus 3) Bulk Modulus

27. The number of incident photons on the cathode affect what?
The lowest amt than any of the other cmpds with a higher carbon to oxygen ratio
One mole of electric charge
When electron falls from high energy to low energy level
The number of electrons emitted

28. The range of pH in which a color change takes place in a titration depends on what?
Polar
When you have central atom with six ions on it
Only temperature of the water bath
When HIn is turned into In- - which is dependent upon the pKa of the indicator

29. The free energy change (G) must be negative when what?
H = negative and S = positive
Going from solid to gas phase
B = pVg; density
+/- 1/2

30. How do the final velocities differ if a sphere is dropped from a distance rather than rolled down an inclined plane?
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
0 Hz because they are traveling side by side at the same speed
Dipole moment; the attractive forces holding them together in liquid state are London or dispersion forces
They do not differ

31. The concentration of OH and H30 ions are approximately equal at what pH?
One that has more solute particles per liter of solution
Isolating an atom from minerals by decomposing the minerals with an electric current
7 always!!!
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect

32. Terminal voltage is provided to what?
External components of the circuit
The path is longer on the inclined plane so it will take object longer to reach the bottom
Neutrons; atomic number
Attractive molecular forces acting between material surfaces in contact

33. When a falling mass is at terminal speed - what is the power expended by the air resistance?
P = F(v) = mg(v -terminal)
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
The element's mass number
When electron falls from high energy to low energy level

34. 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?
An odd number
F = GMm/r^2
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
Positive

35. The square root of 10^anything is equal to what?
Half of the exponent
You should look for the two substances that appear to be equal in structure - with no structural differences (or as little as possible)
Neutrons; atomic number
Sp^3

36. In radioactive decay the atomic number (A) and mass number (Z) must what?
They must balance
Total internal reflection
External components of the circuit
F = GMm/r^2

37. How should the period of a waveform be calculated?
From peak to peak
Accelerated by a higher voltage between the cathode and anode
The regular one
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water

38. If you have longer wavelengths how is their freq and energy compared to shorter wavelengths?
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
Their freq is smaller and energy is smaller; when wavelength is smaller freq is larger and higher energy = more dangerous
The cmpd without the O cannot donate H's like alcohol can to form H bonds with water
Cathode; anode

39. 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?
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
It can absorb light that lets other electrons fill those orbitals
Battery starts off chemical and creates an electrical current which creates thermal energy in the resistors
There is the maximum amount of K and NO3 ions; crystals will precipitate out; common-ion effect

40. When does red litmus paper turn blue?
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
It can absorb light that lets other electrons fill those orbitals
In the presence of a base
It's weight = mg; h

41. In a galvanic and electrolytic cell - reduction of an ion occurs where? Oxidation of an ion occurs where?
B = pVg; density
Attractive molecular forces acting between material surfaces in contact
T = 2pi/angular velocity; v/r
Cathode; anode

42. What is the formula for the power supplied by a battery to accelerate an electron beam?
180 degrees; when there is half a wave distance in phase between two waves
P = IV
They increase because you hear a lower frequency
Going from solid to gas phase

43. Nuclear masses can be approximated from what?

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44. Melting occurs at what type of temperature? Why?
Wavelength: (change in y)/(y) = v/c frequency: (change in f)/(f) = -v/c
Helium; 4
The lowest whole number ratio of moles of each element in a mole of a cmpd
Constant to overcome the heat of fusion (solid to liquid state)

45. Young's modulus is a ________ for a material. What is it's ratio? What would a graph of it look like?
They do not differ
Constant; stress/strain = (F/A)/ (change in L/L) = straight line withe positive slope that stays constant
The lowest one
A positron or electron; when atomic number goes up you know an electron has been emitted

46. The visible spectrum ranges from ____ to _____
Cathode; anode
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
400 to 700 nm
6.02 x 10^23 ions/mol

47. The probability of an X-ray emission event at a given wavelength is measured by what?
They must balance
When you have central atom with six ions on it
Its intensity in the spectrum
A positron or electron; when atomic number goes up you know an electron has been emitted

48. How do you find length of time something is in flight? How do you find distance it traveled?
T = (2h/g)^1/2; distance = vt
From peak to peak
Isolating an atom from minerals by decomposing the minerals with an electric current
The blood pressure in the leg is greater because the column between the arm and the leg has a hydrostatic pressure

49. What is Newton's Universal Law of Gravitation?
F = GMm/r^2
The buoyant force on it; W = mg = pVg
One mole of electric charge
Find how many mol of Ni is available and CO3 available and see which one has lowest number and that's how many moles

50. 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?

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