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The key differences between homogeneous and heterogeneous mixtures, including their definitions, examples, and how to identify them. It also includes questions and answers related to physical and chemical changes, unit conversions, and other fundamental chemistry concepts. The document could be useful for students studying general chemistry, introductory science courses, or preparing for exams that cover these basic chemistry topics.
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What is the term used for findings that are summarized based on a pattern or trend? a. Law b. Hypothesis c. Theory d. Phenomena e. Prediction law Which of the following is a tentative explanation for a set of observations? a. law b. Hypothesis c. Theory d. Phenomena e. Prediction Hypothesis If a liquid contains 60% sugar and 40% water throughout its composition then what is it called? Select one:
a. Solute b. Compound c. Homogeneous mixture d. Heterogeneous mixture e. Solvent Homogeneous mixture Which of the following does not have a uniform composition throughout? Select one: a. Element b. Compound c. Homogeneous mixture d. Heterogeneous mixture e. Solvent Heterogeneous mixture Which one of these represents a physical change? Select one: a. Water, when heated, forms steam. b. Bleach turns hair yellow. c. Sugar, when heated, becomes brown. d. Milk turns sour. e. Apples, when exposed to air, turn brown. Water, when heated, forms steam. How many micrograms are in 65.3 kg?
e. 0.0610 in 0.0610 in What terms defines a mass which is exactly equal to 1/12 the mass of one carbon-12 atom? Select one: a. Isotope number b. Mass number c. Mass-to-charge ratio d. Atomic number e. Atomic mass unit Atomic mass unit How many neutrons are there in an atom of lead whose mass number is 208? Select one: a. 82 b. 126 c. 208 d. 290 e. none of them 126 Which of these elements is chemically similar to magnesium? a. Sulfur b. Calcium c. Iron
d. Nickel e. Potassium Calcium C(graphite) and C(diamond) are examples of... Select one: a. isotopes of carbon. b. allotropes of carbon. c. the law of definite proportions. d. different carbon ions. allotropes of carbon. The 80Br- ion has Select one: a. 45 protons, 35 neutrons, 45 electrons. b. 35 protons, 45 neutrons, 34 electrons. c. 35 protons, 45 neutrons, 36 electrons. e. 35 protons, 45 neutrons, 46 electrons. 35 protons, 45 neutrons, 46 electrons. The formula for sodium sulfide is Select one: a. NaS b. K2S c. NaS
d. C6H e. None of the answers is correct. C6H Which is the correct electron configuration for gold? Select one: a. [Xe]4f145d96s b. [Xe]4f145d106s c. [Xe]4f135d106s e. None of the electron configurations is correct. [Xe]4f145d106s A(n) _________ is a point at which a standing wave has zero amplitude. Select one: a. crevice b. node c. pit d. burrow e. orbital node The Pauli exclusion principle states that no ____ electrons within an atom can have the same ____ quantum numbers. Select one: a. 4; 6 b. 2; 4
c. 3; 6 d. 6; 10 e.3; .2; Emission spectra Select one: a. cannot be used to identify an unknown atom. b. can be used to identify unknown atoms. c. can be explained by the movement of protons colliding with electrons d. none of them can be used to identify unknown atoms. Which one of the following equations correctly represents the process relating to the ionization energy of X? Select one: 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- X(g) → X+(g) + e- Consider the element with the electron configuration [Kr]5s24d105p5. This element is Select one: a. a halogen.
Select one: a. [Ar]3d b. [Ar]4s13d c. [Ar]4s23d d. [Ar]3d e. [Ar]4s23d [Ar]3d An element with the general electron configuration for its outermost electrons of ns2np1 would be in which element group? Select one: a. 2A b. 3A c. 4A d. 5A e. 8A 3A The effective nuclear charge for an atom is less than the actual nuclear charge due to Select one: a. shielding. b. penetration. c. paramagnetism. d. electron-pair repulsion. e. relativity.
shielding Which pair of ions exhibits the greatest attractive force between them? Select one: a. Na+ and Cl- b. Ca2+ and Cl- c. Na+ and S2- d. Al3+ and Mg2+ e. Mg2+ and O2- Mg2+ and O2- Which of the following is a basic oxide? Select one: a. P4O b. MgO c. Al2O d. SO e. Cl2O MgO Which of these compounds is most likely to be covalent? Select one: a. Rb2S b. SrCl c. CS
b. SF c. PCl4+ d. CCl3+ e. NH SF Which of these ionic solids would have the largest lattice energy? Select one: a. NaCl b. NaF c. CaBr d. CsI e. CaCl CaCl The total number of bonding electrons in a molecule of formaldehyde (H2CO) is Select one: a. 3. b. 4. c. 6. d. 8 .e. 18.
Which of the following molecules has a nonzero dipole moment?
Select one: a. BeCl b. SF c. KrF e. CCl SF According to the VSEPR model, a molecule with the general formula AB5 with one lone pair on the central atom will have a ______ molecular geometry. Select one: a. tetrahedral b. trigonalbipyramidal c. square pyramidal d. octahedral e. seesaw square pyramidal Which is the most reasonable prediction for the three F-Br-F bond angles in BrF3? Select one: a. 90°, 90°, and 180° b. 86°, 94°, and 180° c. 86°, 86°, and 172° d. 94°, 94°, and 172° e. 120°, 120°, and 120° 86°, 86°, and 172° When PCl5 solidifies it forms PCl4+cations and PCl6- anions. According to valence bond theory, what hybrid orbitals are used by phosphorus in the PCl4+cation?
BeCl2; sp According to the VSEPR model, the predicted molecular geometry of ammonia, NH3, is.. Select one: a. linear. b. trigonal planar. c. bent. d. tetrahedral. e. trigonal pyramidal. trigonal pyramidal. What is the mass of one copper atom? (NA = 6.022 × 1023 mol-1) Select one: a. 1.055 × 10-22 g b. 63.55 g c. 1 amu d. 1.66 × 10-24 g e. 9.476 × 1021 g 1.055 × 10-22 g What is the percent sulfur in iron(III) sulfate? a. 28% b. 32% c. 24% d. 48%
e. 42% 24% Proteins found in humans are polymers that consist of different combinations of 20 amino acids. Proline, one of the 20 amino acids, has the molecular formula, C5H9NO2. If a human protein has 25 proline monomers, how many carbon atoms from proline are present in the protein? Select one: a. 4 C atoms b. 25 C atoms c. 40 C atoms d. 100 C atoms e. 125 C atoms 125 C atoms Aluminum oxide, Al2O3, is used as a filler for paints and varnishes as well as in the manufacture of electrical insulators. Calculate the number of moles in 47.51 g of Al2O3. Select one: a. 2.377 mol b. 2.146 mol c. 1.105 mol d. 0.4660 mol e. 0.4207 mol 0.4660 mol Once the following equation is balanced with the smallest set of whole number coefficients, what is the sum of the coefficients? (Don't forget to include coefficients of one.) a. 4
Select one: a. CH3NH b. BCl c. F- d. BF4- e. CH BCl Which is an amphoteric oxide? Select one: a. Na2O b. MgO c. Al2O d. SO e. Cl2O Al2O What is the value of the equilibrium constant for the autoionization of water at 25°C? Select one: a. 1.0 × 10- b. 1.0 × 10- c. 1.0 × 1014 e. 14 1.0 × 10- Which is the strongest acid?
Select one: a. SO42- b. H2SO c. H2SO d. HSO4- e. HSO3- H2SO In the van der Waals equation, the constant b is a constant that is part of a correction factor for _________. Select one: a. the volume of the gas b. the temperature of the gas c. the pressure of the gas d. the ideal gas constant the volume of the gas A sample of nitrogen gas at 298 K and 745 torr has a volume of 37.42 L. What volume will it occupy if the pressure is increased to 894 torr at constant temperature? Select one: a. 22.3 L b. 31.2 L c. 44.9 L d. 112 L e. 380 L
