Central Science: Chapter 23
#1. Chalcocite, chalcopyrite, and malachite are sources of which metal?A) manganeseB) copperC) titaniumD) ironE) zinc - B #2. Which mineral contains titanium?A) pyrolusiteB) chalcopyriteC) gale...
Chemistry4Life|6 months ago|±0|155 views
Central Science: Chapter 8
#1. Which of the following has eight valence electrons?A) Ti4+B) KrC) Cl-D) Na+E) all of the above - E #2. Which of the following does not have eight valence electrons?A) Ca+B) Rb+C) XeD) Br-E) A...
Chemistry4Life|6 months ago|±0|204 views
Central Science: Chapter 21
#1. All atoms of a given element have the same ________.A) mass numberB) number of nucleonsC) atomic massD) number of neutronsE) atomic number - E #2. Atoms containing radioactive nuclei are call...
Chemistry4Life|6 months ago|±0|153 views
Week 7 - Chemistry
#1. etermine the number of grams of C₄H₁₀ that are required to completely react to produce 8.70mol of CO₂ according to the following combustion reaction: 2C₄H₁₀(g)+13O₂(g)→8CO₂(g)+10H₂O(g) - The ...
SkyRose|8 months ago|±0|503 views
Central Science: Chapter 15
#1. At equilibrium, ________.A) all chemical reactions have ceasedB) the rates of the forward and reverse reactions are equalC) the rate constants of the forward and reverse reactions are equalD...
Chemistry4Life|6 months ago|±0|168 views
Central Science: Chapter 11
#1. Crystalline solids ________.A) have their particles arranged randomlyB) have ordered structuresC) are usually very softD) exist only at high temperaturesE) exist only at very low temperature...
Chemistry4Life|7 months ago|±0|362 views
Central Science: Chapter 16
#1. According to the Arrhenius concept, an acid is a substance that ________.A) is capable of donating one or more H+B) causes an increase in the concentration of H+ in aqueous solutionsC) can a...
Chemistry4Life|6 months ago|±0|119 views
Week 6 - Chemistry
#1. What are the reactants in the following equation: HCl(aq) + NaHCO₃(aq)→ CO₂(g) + H₂O(l) + NaCl(aq) A) HCl, NaHCO₃ B) HCl, CO₂ C) NaHCO₃, H₂O D) CO₂, H₂O E) H₂O, NaCl, CO₂ - A) HCl, NaHCO₃ ...
SkyRose|8 months ago|±0|533 views
Week 3 - Chemistry
#1. The element symbol for copper is _____ A) C B) Cr C) Co D) Ce E) Cu - E) Cu #2. The element symbol for nickel is _____ A) Ni B) N C) Nc D) Ne E) Nh - A) Ni #3. The element sy...
SkyRose|8 months ago|±0|1,551 views
Central Science: Chapter 17
#1. Which one of the following pairs cannot be mixed together to form a buffer solution?A) HONH2, HONH3ClB) NaCl, HCl C) RbOH, HFD) KOH, HNO2E) H2SO3, KHSO3 - B #2. Which one of the following pai...
Chemistry4Life|6 months ago|+1|206 views
Central Science: Chapter 5
#1. Objects can possess energy as ________. (a) endothermic energy (b) potential energy (c) kinetic energy A) a onlyB) b onlyC) c onlyD) a and cE) b and c - E #2. The internal energy of a...
Chemistry4Life|7 months ago|+1|468 views
Central Science: Chapter 19
#1. The first law of thermodynamics can be given as ________.A) ΔE = q + wB) ΔH°rxn = ΣnΔH°f(products) - ΣmΔH°f(reactants)C) for any spontaneous process, the entropy of the universe increasesD) ...
Chemistry4Life|6 months ago|±0|273 views
Central Science: Chapter 10
#1. Which of the following statements about gases is false?A) Gases are highly compressible.B) Distances between molecules of gas are very large compared to bond distances within molecules.C) No...
Chemistry4Life|6 months ago|+1|237 views
Quiz 2 -
#1. What group (G) and period (P) does the element molybdenum (Mo) belong to? A) G = 5, P = 6 B) G = 6, P = 6 C) G = 6, P = 4 D) G = 6, P = 5 E) G = 5, P = 5 - D) G = 6, P = 5 #2. Whic...
SkyRose|8 months ago|±0|1,222 views