Atomic structure Questions and Answers

A 0 630 g sample of the ore is completely dissolved in concentrated HNO3 aq The mixture is diluted with water to a final volume of 50 00 mL Assume that a What is the Co2 in the solution if the absorbance of a sample of the solution is 0 74 b Calculate the number of moles of Co aq in the 50 00 mL solution c Calculate the mass percent of Co in the 0 630 g sample of the ore I the cobalt in the ore sample is converted to Co aq

The substance not completely used up in a chemical reaction is known as the Theoretical yield b actual yield d excess reactant c limiting reactant A and B stops when A is completely used up c limiting reactant d excess reactant A and B stops when A is completely used up c limiting reactant d excess reactant A chemical reaction involving substances Bis the a Theoretical yield b actual yield A chemical reaction involving substances A is the a Theoretical yield b actual yield The amount of product formed after the reaction stops a Theoretical yield b actual yield c limiting reactant d excess reactant

gram candle is made of paraffin C25H52 A student lights the candle and covers it with a beaker trapping 2 35 g O in with the candle Eventually the flame goes out C25H52 38 O2 26 H O 25 CO a What was the limiting reactant in this reaction b How many grams of H O formed c After the flame goes out will some of the candle still be there How do you know

Listen What is the wavelength of light nm that has a frequency 4 62 x 10 4

wavelength in nm of photon absorbed when an electron transitions from the to the n 9 state

Fr Ra Rc Rf Ha Bi Po At Rn Ce Pr Nd Pm Sm Eu Gd Tb Dy Ho Er Tm Yb Lu Th Pa U Np Pu Am Cm Bk Cf Es Fm Md Lr Arrange the following ions in order of increasing ionic radius selenide ion strontium ion bromide ion rubidium ion Enter the FORMULA for each ion in the boxes below Smallest Laugoet

Date Physical Science Final Review All highloghted items are optional 1 List the three subatomic particles tell where they are found and what charge they have Particle location charge Neutral Neutron Name Proton pt Electron 2 Label the parts of the beryllium Be atom to the right 3 What is an isotope 4 How are the elements arranged in the periodic table protons and eletrons if neutral 5 electrons determine how an atom will react 6 What does the atomic number tell you 7 How do you find the number of neutrons an atom of an element would have 8 What are valence electrons and how do you find out how many valence electrons an element has a Mg 24 b Mg 26 c N 15 d 0 18 no 9 Give the number of protons neutrons and electrons in the following isotopes of protons of neutrons of electrons 23 Na K F e Si 30 f S 34 10 Complete the table There is enough information given for each element to determine all missing numbers Symbol Atomic Mass Number Number of Number of Protons Number Electrons 1311 36S O nucleus Positive 1 nucleus Ele tron cloud in energy levels Negative 20 50 1 40 41 109 2 47 19 18 50 46 1 Number of Neutrons 10 72

A 337 nm nitrogen laser puts out 5 00 W of power with a beam 4 80 mm in diameter The beam is pointed directly at a pinhole which has a diameter of 1 20 mm How many photons of light will travel through the pinhole per second Assume that the intensity of the light is equally distributed across the whole area of the beam number of photons per second photons s

The following nuclear reaction 355 16 35S 35Cl e 17 is an example of O Alpha decay O Gamma emission O Positron emission O Beta decay O Electron capture

Predict the ground state electron configuration of each ion Use the abbreviated noble gas not Cr Cu

1 point The molar mass of a compound is 380 0 g A sample is found to contain 31 58 carbon 3 16 hydrogen 7 37 nitrogen 33 68 oxygen and 24 21 sodium What is the act formula of the compound C5H6NO4Na2 C4H6NO4Na2

rrange Most energy released by gaining an electron CI Most energy absorbed by gaining an electron

German physicist Werner Heisenberg related the uncertainty of an object s position Ax to the uncertainty in its velocity Av Ax h 4xmAv where h is Planck s constant and m is the mass of the object The mass of an electron is 9 11 x 10 31 kg What is the uncertainty in the position of an electron moving at 7 00 x 106 m s with an uncertainty of Av 0 01 x 10 m s

Classify the atomic orbitals as s p or d according to their shape P

Arrange the following groups of atoms in order of increasing size Enter multiple answers as a comma separated list a Na K Mg b Ba Ge Ar c Fe P O 4

Arrange the set of ions in order of increasing size 2 CI K Ca Enter a number from 1 to 4 to order the ions by increasing size 1 being smallest 4 being larges S2 CI

How many unpaired electrons are contained in each element a calcium b argon c aluminum and d carbo 0 1 2 3 4 5 6 a Calcium b Argon c Aluminum unpaired electron s unpaired electron s unpaired electron s

What are valence electrons? How many valence electrons does Na have? How many total electrons does Na have? How many valence electrons does O have? How many total electrons does O have?

How many valence electrons do atoms "desire" to have? What group has this number of valance electrons? Is this group reactive or non-reactive?

Which of these is true for a molecular model like the one shown? A. We can always identify the type of each atom based on color. B. The model shows how the various atoms are connected in the molecule. C. The model shows the actual size of each atom correctly. D. The model shows the relative sizes of the atoms to each other.

The blue color of the sky results from the scattering of sunlight by molecules in the air. The blue light has a frequency of about 7.23 x 10¹4 Hz. Calculate the wavelength (in nm) associated with this radiation, and calculate the energy (in joules) of a single photon associated with this frequency. Enter your answers in scientific notation. (a) Wavelength of the radiation: (b) Energy (in joules) of a single photon:

Ni²+ Express your answers as integers. Enter your answers separated by a comma. Np, Ne= S2- Express your answers as integers. Enter your answers separated by a comma.

You used a green dye for the spectroscopy. What color wavelength was absorbed by the light? green violet yellow red

A 5.70 g sample of candy is placed in a bomb calorimeter and combusts in excess oxygen. The temperature of the calorimeter increases from 20.81°C to 23.65°C. The heat capacity of the calorimeter is 29.10 kJ/K. How many nutritional Calories are there per gram of the candy?

Consider the balanced reaction below: Pb(NO3)2 + Na2 CrO4 → PbCrO4 + 2NaNO3 How many moles of sodium nitrate, NaNO3, would be produced from the complete reaction of 253 g sodium chromate, Na2CrO4?

Consider the following molecule. Draw the Lewis Structure and use the drawing to fill in the following chart: PF6- Number of Valence e (Whole Structure) Areas of e Density Around Central Atom: Electronic Geometry: # Bonding Areas (Central Atom): # Non-Bonding Areas (Central Atom): Molecular Geometry Bond Angles (Central Atom) Polar Bonds? Polar Molecule? Any Pi (Double/Triple) Bonds? Draw your Lewis Dot:

Which statement best describes the bonds in NH4CI? All bonds are ionic All bonds are covalent The NH4Cl bond is covalent and the N-H bonds are ionic. The NH4Cl bond is ionic and the N-H bonds are covalent.

When an electron in an atom moves from the ground energy state to an excited state energy is absorbed by the atom energy is emitted by the atom the atom becomes negatively charged the electron moves closer to the nucleus

Microwave ovens emit microwave energy with a wavelength of 12.7 cm. What is the energy of exactly one photon of this microwave radiation?

What is the correct name for Ca3N₂? calcium nitrogen calcium nitride calcium nitrite calcium nitrate

Which of the following molecules is polar? CCI4 SO3 H2S CO₂

Metals lose electrons under certain conditions to attain a noble gas electron configuration. How many electrons must be lost by the element Ca? number of electrons: Which noble gas electron configuration is attained in this process? helium xenon radon argon krypton neon

Arrange the elements according to atomic radius. S Ar Cl Al Si P Mg Na

Given the following equation: 2 KClO3 ---> 2 KCl + 3 O₂ Show what the following molar ratios should be. Please report number, colon, number KCIO3/O₂ 2:3 number:number KCIO3/KCI Given the following equation: Na₂O + H₂O ---> 2 NaOH Show what the following molar ratios should be. Please report number, colon, number Na₂O/H₂O Na₂O/ NaOH H₂O/NaOH

Arrange the atom and ions according to radius. Rb+ Rb Rb-

Calculate the energy in joules and the wavelength in nanometers of the spectral line produced in the hydrogen spectrum when an electron falls from the tenth Bohr orbit to the fourth. In which region of the electromagnetic spectrum (UV, visible, or infrared) is the line? Report all numerical answers to three significant figures.

Identify the possible quantum numbers associated with each of the following orbitals. (Where multiple choices are possible, write all possible values separated with a comma with no spaces) 2p orbital n=: l= m1=

The half life for the decay of carbon-14 is 5.73 × 10³ years. Suppose the activity due to the radioactive decay of the carbon-14 in a tiny sample of an artifact made of wood from an archeological dig is measured to be 4.7 x 10 Bq. The activity in a similar-sized sample of fresh wood is measured to be 7.0 x 10 Bq. Calculate the age of the artifact. Round your answer to 2 significant digits.

If an electron travels at a velocity of 4.7 x 107 m/s and has a mass of 9.109 x 10-28 g (1 kg = 1000 g). What is its wavelength in m? Given Planck's constant is 6.626 x 10-34 J s. (Answer in scientific notation. Example: 1.23 x 10-4 = 1.23*10^-4)

Which of the statements accurately describe all halogen elements? They react with alkali metals to form salts. They are highly reactive. They have the same boiling point. They have one electron missing in their outer shell. They only have one electron in their outer shell.

How can we write the following set of equations in the simplest form according to Hess's Law? NaOH → Na +O+H HCI → H + CI Na + Cl → NaCl 2H + O → H₂O a. NaOH + HCl → NaCl + H₂O b. NaOH + HCl + Na + CI+H+Cl-NaCl + H₂O c. NaCl + H₂O- NaOH + HCI d. NaOH₂Cl → NaCIH₂

5. Describe one similarity and one difference between this model (pennies) and actual radioactive decay.

2. Convert the wavelength of the following metals to meters (1nm = 1x10 m). Then calculate the frequency of the light emitted and convert to THz (1THz = 1x10¹² Hz): a. Barium 550nm = 5.S* 107 m b. Calcium c. Copper d. Lithium e. Unknown 1

The first eight ionization energies for an element from the third row in the periodic table are listed below in units of kJ/mol. Identify the element. 577.54, 1816.68, 2744.78, 11577.50, 14841.9, 18379, 23326, 27464 Na Mg OAI Si OP OS O CI

The optic nerve needs a minimum of 2.0 x 10-17 J of energy to trigger a series of impulses that eventually reach the brain. a) How many photons of red light (700. nm) are needed? b) How many photons of blue light (475 nm)? c) Which color of light is traveling faster?

The magnetic quantum number specifies the relative spatial orientation of a particular orbital. O True O False

IE values for Element Y is as follows: IE₁= 400kj/mol, IE₂= 1800kj/mol, IE3= 2400kj/mol, IE4= 3000kj/mol a. Identify the # of valence electrons in the above element. Explain b. Which group does it belong to? G. c. If Element Y is in Period 4, identify the element. Ga d. If all its valence electrons are removed, write its ion formed.

(a) What is the electrostatic potential energy (in joules) between an electron and a proton that are separated by 53 pm? (b) What is the change in potential energy if the distance separating the electron and proton is increased to 1.0 nm? (c) Does the potential energy of the two particles increase or decrease when the distance is increased to 1.0 nm?

What is the frequency, in hertz, of an electromagnetic wave with a wavelength of 215 nm? • Use 3.00 x 108 for the speed of light. • Report your answer in scientific notation and round to three significant figures. Provide your answer below: Hz

What is the wavelength, in meters, of a proton traveling at 6.5 x 10^5 m/s if its mass is 1.673 x 10-27 kg? Use 6.626 x 10-34 J s for Planck's constant. Round the answer to two significant figures. Write the answer in scientific notation, using the times symbol from the palette. Provide your answer below: