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Questions in chemistry

📝 Answered - Aqueous solutions of which ion give a reddish precipitate when excess hydroxide ion is added? A. [tex] \text{Cu}^{2+} [/tex] B. [tex] \text{CO}_3^{2−} [/tex] C. [tex] \text{Fe}^{3+} [/tex] D. [tex] \text{Al}^{3+} [/tex] E. [tex] \text{Pb}^{2+} [/tex]

📝 Answered - Which substance does not obey the Lewis octet rule? a. O₂ b. NO c. CO d. N₂

📝 Answered - Why are water storage tanks usually built on towers or hilltops?

📝 Answered - Which is a proper description of chemical equilibrium? A. The frequencies of reactant and product collisions are identical. B. The concentrations of products and reactants are identical. C. The velocities of product and reactant molecules are identical. D. Reactant molecules are forming products as fast as product molecules are reacting to form reactants. E. The numbers of moles of reactants and products are equal.

📝 Answered - Solid sulfur dioxide, SO₂(s) Choose from the following: A. an ionic solid B. a metallic solid C. a molecular solid containing nonpolar molecules D. a covalent network solid E. a molecular solid containing polar molecules

📝 Answered - Na\(_2\)SO\(_4\) (aq) + AgNO\(_3\) (aq) yields what when balanced?

📝 Answered - Which instrument is directly used to determine the relative masses of atoms? A. Spectroscope B. Geiger counter C. Mass spectrograph D. Microbalance E. Electron microscope

📝 Answered - [tex]K_a[/tex], the acid dissociation constant, for an acid is [tex]9 \times 10^{-4}[/tex] at room temperature. At this temperature, what is the approximate percent dissociation of the acid in a 1.0 M solution? A. 0.03% B. 0.09% C. 3% D. 5% E. 9% Can you please explain with some details?

📝 Answered - How many pi bonds are in the molecule 2-butyne, CH₃C≡CCH₃? a. 1 b. 2 c. 4 d. 6 e. 10

📝 Answered - This element is used to improve the conductivity of germanium. A. K B. Ga C. Fe D. Mg E. Al