Chemistry 210 Final, Questions with 100% Correct Answers| Graded to Pass

C The electron configuration of indium, In, is ______. B In general, atomic radii _____. A) increase from left to right in a period and increase down a group. B) decrease from left to right in a period and increase down a group. C) increase from left to right in a period and decrease down a group. D) do not change across a period or a group. E) decrease from left to right and decrease down a group. AD D. g x 1mo/mm x 6.022x10^23/1 mol x #of na atoms Calculate the number of sodium atoms in 9.28 g of sodium carbonate, Na2CO3. The molar mass of Na2CO3 is 105.99 g/mol. A) 1.75 × 10-1 Na atoms B) 5.27 × 1022 Na atoms C) 1.58 × 1023 Na atoms D) 1.05 × 1023 Na atoms E) 8.76 × 10-2 Na atoms C Which of the following statements about quantum numbers is FALSE? A) The principal quantum number (n) describes the size of an orbital. B) The angular momentum quantum number (ℓ) describes the shape of an orbital. C) The magnetic quantum number (mℓ) describes the direction of spin of an electron. D) An electron in an atom can be uniquely identified by four quantum numbers (n, ℓ, mℓ, ms). E= first ionization energy 2nd= X+(g) X3+(g) + e- 3rd= X2+(g) X3+(g) + e- Which one of the following equations correctly represents the process relating to the first ionization energy of X? A) X(s) ⟶ X+(g) + e– B) X2(g) ⟶ X+(g) + X–(g) C) X(g) + e- ⟶ X-(g) D) X-(g) ⟶ X(g) + e– E) X(g) ⟶ X+(g) + e– C Which of the following drawings represents a potassium cation, K+ ? C E= energy h=6.63x10^-34 J.s. = planks constant E=hU c=wavelengthU = speed of light E= hc/wavelength Calculate the energy of a photon of light that has a wavelength of 453 nm. A) 6.62 × 1014 J B) 2.28 × 1018 J C) 4.39 × 10-19 J D) 9.00 × 10-32 J E) 4.53 × 10-7 J C same denominator different numerator Which of the following represent isotopes ? E (mass 1 x percentx100 1) + (mass 2 x percentx100 2)= average atomic mass (120.904 amu x 0.5730) + (X x (1 - 0.5730))= 121.757 amu 69.278 amu + 0.427 X = 121.757 amu X=122.9 amu Element X has two naturally occurring isotopes and an average atomic mass of 121.757 amu. One of the isotopes has a mass of 120.904 amu and a percent abundance of 57.30%. What is the mass of the other isotope ? A) 122.4 amu B) 121.8 amu C) 121.2 amu D) 122.6 amu E) 122.9 amu A 50 - 4 Which of the following species has 46 electrons ? B denominator = protons numerator - denominator = neutrons denominator +- charge How many protons, neutrons, and electrons are in A) 24 protons, 27 electrons, 32 neutrons B) 27 protons, 24 electrons, 32 neutrons C) 59 protons, 32 electrons, 27 neutrons D) 27 protons, 30 electrons, 32 neutrons E) 59 protons, 24 electrons, 27 neutrons E Atomic number = z = 28 [Ar] 4s2 3d8 4s[ -_ ] 3d[ -_ ][-_ ][-_ ][-][-] An atom of nickel has ___ unpaired electrons and is _____. A) 3, paramagnetic B) 4, paramagnetic C) 0, diamagnetic D) 5, paramagnetic E) 2, paramagnetic D Butyric acid has the structural formula given below. What is the empirical formula for butyric acid ? A) C5H8O3 B) CHO C) C3H7O D) C2H4O E) C4H8O2 B Which is a set of quantum numbers for an electron in a 4f orbital ? A) n = 4, ℓ = 3, mℓ = +3, ms = -1 B) n = 4, ℓ = 3, mℓ = -2, ms = +½ C) n = 4, ℓ = 0, mℓ = +2, ms = -½ D) n = 4, ℓ = 2, mℓ = +1, ms = +1 E) n = 4, ℓ = 1, mℓ = -2, ms = +½ D Place the following electromagnetic waves in order of increasing wavelength. Infrared X-rays Visible light Ultraviolet light A) Infrared Visible light Ultraviolet light X-rays B) Visible light Ultraviolet light Infrared X-rays C) Visible light Ultraviolet light X-rays Infrared D) X-rays Ultraviolet light Visible light Infrared E) Ultraviolet light Infrared X-rays Visible light B Pragmatic = unpaired electrons Which of the following orbital diagrams represent(s) a paramagnetic atom ? A) I only B) II only C) I and II only D) I and III only E) III only C take from the highest quantum number Fe3+ = [Ar]4s^2 3d^6 (take from the 4s bc 4 is higher than 3) 4s ^2-2= 0 3d^6-1=5 Which of the following is the electron configuration of the Fe3+ ion ?