Straighterline Chemistry Final Study Guide Rated A+

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 {Ans: d. Heterogeneous mixture}Only valence electrons are shown in the Lewis structure held together by covalent bonds. Select one: True False {Ans: True}Reddox or oxidation-reduction {Ans: reaction where electrons are transferred from one reactant to another}Which is a Lewis acid? Select one: a. CH3NH2 b. BCl3 c. F- d. BF4- e. CH4 {Ans: b. BCl3}Acetylene (properly known as ethyne) and calcium hydroxide are the products of the reaction between calcium carbide (CaC2) and water. Ethyne can be easily set on fire. This can be done on the surface of an ice cube, giving it the appearance of "burning ice". Identify the balanced reaction for the combustion of ethyne and explain why it burns with intense heat. A. 2C2H2 + 5O2 Ã 4CO2 + 2H2O; There is a lot of energy released in this reaction because there is a triple bond between the carbons in ethyne, which contains a lot of energy, and this energy is released when the bonds are broken. B. C2H4 + 3O2 Ã 2CO2 + 2H2O; There is