3. Find the mass percent of oxygen in ethanol, C_(2)H_(6)O
BaSO_(4) is used in diagnostic nuclear medicine techniques because it is highly insoluble. K_(sp)=1.5times 10^-9 25^circ C Calculate the molar solubility of the salt. What is the concentration of Ba2+ions in the saturated solution? [Ba^2+]=[?]times 10^[?]M
50. For which of the following cleaning issues are general purpose detergents effective? Dirt and grime on the walls Grease in the exhaust hood Baked on food on ovenware Mineral build-up on equipment
True or False: Isotope refers to the electrical charge of the electron. True False
When the following half reaction is balanced, how many electrons are present and are they on the reactants or products side of the equation? Ti^2+(aq)arrow TiO_(2)(s) Number of electrons: square Side of equation: square
Polar solutes are soluble in Multiple Choice most ionic solvents polar solvents nonpolar solvents More than one of these choices are correct. None of the choices are correct.
Calculate the pH of a 1.0times 10^-8 M aqueous solution of hydrochloric acid (HCl). Round your answer to 2 decimal places. square
58) Which substance below is an ionic solid? A) Cu(s) B) H_(2)O(s) C) MgO(s) D) C_(6)H_(12)O_(6)(s) E) none of the above
The radical is generated when chlorine radicals react with ozone. Calculate the maximum wavelength (in nanometers) required to break a Cl-Cl bond in Cl_(2) (the precursor to chlorine radicals)Round your answer to 3 significant digits. Note: Reference the Bond energies and Fundamental Constants tables for additional information. square nm
An industrial chemist studying bleaching and sterilizing prepares several hypochlorite buffers. Find the pH of 0.150 M HClO and 0.100 M NaCIO. Be sure your answer has the correct number of significant figures. Note: Reference the K_(a) of acids at 25^circ C table for additional information. pH=square
During brazing, which of the following may present health hazards? Zinc Beryllium Cadmium or phosphorus All are correct
Which particles determine the affinity of atoms to each other and thus the likelihood of a chemical reaction? Protons Neutrons Electrons Nucleus
Get It? Explain how the ion $HCO_{3}^{-}$ can be both an acid and a base. Describe what happens in the forward and reverse reactions when ammonia is dissolved in water. Identify the conjugate acid, the conjugate base, and the two conjugate acid-base pairs.
Write the net ionic equation between $Cr_{2}(SO_{4})_{3}(aq)$ and $Ba(OH)_{2}(aq)$ Be sure to include the states of matter. $\square $
Sequence the following equations in the steps of the ionization of phosphoric acid in the correct order. $HPO_{4}^{2-}(aq)+H_{2}O(l)\rightleftharpoons H_{3}O^{+}(aq)+PO_{4}^{3-}(aq)$ $H_{3}PO_{4}(aq)+H_{2}O(l)\rightleftharpoons H_{3}O^{+}(aq)+H_{2}PO_{4}^{2-}(aq)$ $H_{2}PO_{4}^{-}(aq)+H_{2}O(l)\rightleftharpoons H_{3}O^{+}(aq)+HPO_{4}^{-}(aq)$
When a halide leak detector is used, what color will a blue flame turn when it comes in contact with leaking refrigerant vapors? A. blue B. green C. white D. orange
What kind of Isomers are 1-butene and 2-butene (pictured above)? stereoisomers structural isomers geometric isomers not isomers
Write the balanced NET ionic equation for the reaction when $Cr(NO_{3})_{3}$ and $Li_{2}CO_{3}$ are mixed in aqueous solution. If no reaction occurs, simply write only NR. Be sure to include the proper phases for all species within the reaction.
What type of elements are the lanthanides and actinides? a mostly nonmetals and a few metals b mostly metals and a few nonmetals C all nonmetals d all metals
Describe what happens in the forward and reverse reactions when ammonia is dissolved in water. Identify the conjugate acid, the conjugate base, and the two conjugate acid-base pairs.
