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CHE 101 Final
| Question | Answer |
|---|---|
| Which of the following is an example of qualitative information about a substance? | Color of the substance |
| Which of the following statements is true of a chemical equation? | It shows that the reactants on the left side of an equation produce the products on the right. |
| Which of the following is NOT an example of an intensive property of matter? | Mass |
| Which of the following is NOT a correct name–symbol combination? | Sodium, So |
| A hypothesis is a _____. | tentative explanation or predication based upon experimental observations |
| Which of the following statements concerning green chemistry is NOT correct? | Chemical syntheses should be done at extremely high temperatures to ensure that harmful bacteria are destroyed. |
| Which one of the following is most likely to be a homogeneous mixture? | gasoline |
| Balancing chemical equations is an application of | The law of conservation of matter |
| Which of the following is NOT a base SI unit? | Calorie |
| The wavelength of light emitted from a particular red diode laser is 651 nm. What is the wavelength in meters? | 6.51 × 10^–7 m |
| Express 0.00780 in exponential notation. | 7.80 × 10^–3 |
| Which of the following elements belong to the halogens? | Chlorine |
| A neutral atom of an isotope 80Hg200 contains _____. | 120 neutrons, 80 electrons, and 80 protons. |
| The masses of isotopes and their abundances are determined experimentally using _____. | a mass spectrometer |
| A sample of an element consists of two isotopes. The percent abundance of one of the isotopes is 43.0%. What is the percent abundance of the other isotope? | 57.0% |
| How many sodium atoms are in 0.5 mol of sodium? (Avogadro number is 6.022 x 1023). | 3.011 x 10^23 |
| Which of the following sets of ions are present in sodium sulfate, Na2SO4? | Na+ and SO4^2− |
| All of the following are equal to Avogadro's number EXCEPT _____. | the number of atoms of oxygen in 1 mol O2 |
| How many s orbitals are in the n = 3 shell? | 1 |
| Which of the following is the correctly balanced equation for the synthesis of ammonia (NH3)? | N2 + 3H2 → 2NH3 |
| How much energy is gained by copper when 48.7 g of copper is warmed from 10.2 °C to 67.0 °C? The specific heat capacity of copper is 0.385 J/(g·°C). (hint Heat = mcΔT) | 1.06 × 10^3 J |
| The enthalpy for the neutralization reaction between NaOH and HCl is given below. NaOH (aq) + HCl (aq) → NaCl (aq) + H2O( ) ΔrH° = –57 kJ/mol-rxn What is the enthalpy change for the reaction below? NaCl (aq) + H2O ( ) → NaOH (aq) + HCl (aq) | +57 kJ/mol-rxn |
| Which of the following techniques is used to measure the energy evolved or absorbed as heat in a chemical or physical process? | Calorimetry |
| Boron (B), carbon (C), nitrogen (N), oxygen (O), and fluorine (F) are in the same period of the periodic table. Which of the following bonds is most polar? | F-H |
| The first four successive ionization energies in kJ/mol of an element X are: 1st = 578 2nd = 1,817 3rd = 2,745 4th = 11,577. Which group of the periodic table does X belong? | Group 3A |
| Electronegativity is a measure of _____. | the ability of an atom in a molecule to attract electrons to itself |
| What is the bond angle in a tetrahedral molecule or ion? | 109.5 |
| What does the Pauli Exclusion Principle state? | No two electrons in the same atom can have the same set of quantum numbers. |
| Which of the following molecules has a Lewis dot structure that does not obey the octet rule where the central atom has more than eight electrons in the outermost shells? | SF6 |
| Which of the following statements concerning accuracy and precision is correct? | It is possible for a series of measurements to be both precise and inaccurate. |
| What is the total number of valence electrons in the sulfite ion, SO32-? Both S and O are in group 6A of the periodic table. | 26 |
| Which of the following equations corresponds to the sum of magnesium's first and second ionization? | Mg(g) → Mg2+(g) + 2e- |
| The ground state electronic configuration of an element is 1s2 2s2 2p6 3s2 . What is the typical charge on the monatomic ion of the element? | -2 |
| Which of the following statements is true of atomic radii? | They increase down a group and decrease across a period. |
| Which of the following elements is found in the s-block of the periodic table? | Calcium (Ca) |
| The small, but important, energy difference between 2s and 2p electrons is a consequence of | their effective nuclear charge |
| What is the spin quantum number of an electron that is spin-up (↑)? | +1/2 |
| Which of the following statements is true? | Core electrons effectively shield outer electrons from the nuclear charge. |
| An element X has a 1s22s22p4 electron configuration. Which of the following statements is NOT correct for the element X? | The p-orbital of X is half-filled. |
| The procedure by which electrons are assigned to (or built up into) orbitals is known as the ____ principle. | Aufbau |
| Which of the following orbitals has the greatest screening effect? 1s 2s 2p 3s 3p 3d | 1s |
| What is the maximum number of electrons that can occupy a p orbital? | 6 |
| It is impossible to simultaneously measure the exact location and energy of an electron. This is called | Heisenberg’s uncertainty principle |
| An electron with the quantum number n = 2, = 0 is in which orbital? | 2s |
| For which of the following transitions would an electron require the absorption of the highest amount of energy? | n = 1 to n = 2 |
| Which type of experiment demonstrates that an electron has the properties of a wave? | electron diffraction |
| Which of the following solutions is most acidic? | pH 1.0 |
| The molecular orbital electronic configuration of a molecule X2 is (σ1s)2 (σ*1s)2 (σ2s)2 (σ*2s)2 (π2px)1 (π2py)1 Which of the following statements is NOT true of the molecule X2? | The element X is found in the s-block of the periodic table. |
| Which of the following reactions can be classified as a precipitation reaction? | Pb(NO3)2(aq) + 2KI(aq) → PbI2(s) + H2O(l) |
| Which of the following statements is NOT correct for the equilibrium reaction? N2(g) + 3H2(g) ⇌ 2NH3(g) ΔrH° = – 92.4 kJ/mol-rxn | At equilibrium, the forward and backward reactions cease to occur. |
| Which of the following ranks the regions of the electromagnetic spectrum from shortest to longest wavelength? | gamma rays > x-rays > visible > infrared> microwaves. |
| Which of the following observations is an example of a chemical change? | Iron (Fe) rusts, forming Fe2O3. |
| Which of the following statements is NOT correct? | All the elements in the p-block of the periodic table are nonmetals. |
| If the molecular orbital electronic configuration of He2 is (σ1s)2 (σ*1s)2 What is the bond order? | 0 |
| Which of the following statements concerning the kinetic-molecular theory of matter is NOT correct? | There is no force of attraction between solid particles. |
| Atomic orbitals combine most effectively to form molecular orbitals when | The atomic orbitals have similar energies. |
| What is the hybridization of the central atom in a molecule with a trigonal-planar molecular geometry? | sp2 |
| What is the oxidation number of the element X in X2O? | +1 |
| Which of the following electronic configurations represents a transition metal? | 1s22s22p63s23p6 4s13d5 |
| Which of the following statements is NOT CORRECT? | In an endothermic reaction, heat is transferred from the system to the surroundings. |
| Which one of the following substances is classified as a chemical compound? | NO |
| What is the maximum number of electrons in the n = 3 shell? | 18 |
| An element with electronic configuration: 1s2 2s2 2p6 3s2 3p6 4s2 is found in | Period 4, group 2A |
| Which of the following orbitals has the greatest screening effect? 1s 2s 2p 3s 3p 3d | 1s |
| Which of the following statements is true? | Electronegativity increases across the period. |
| What does the Pauli Exclusion Principle state? | No two electrons in the same atom can have the same set of quantum numbers. |
| The change in energy for the following reaction of boron B(g) + e– → B–(g) is called | First electron affinity. |
| The molecular orbital electronic configuration of an element X is (σ1s)2 (σ*1s)2 (σ2s)2 (σ*2s)2 (π2px)2 (π2py)2 (σ2pz)2 (π*2px)2(π*2px)1(σ*2pz)1 The molecule X2 has | 10 bonding electrons and 8 antibonding electrons. |
| The Lewis structure of formaldehyde (CH2O) is Which of the following statements is true? | The O-atom has 4 non-bonding electrons and 4 bonding electrons |
| The atomic number of an element X is 17. If the mass number is 37, then it contains | 17 protons, 17 electrons, and 20 neutrons. |
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