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
6. How many mols of $CO_{2}$ are formed with 4.87 grams of baking soda? Click on the letter in the formula to insert a number. $[A]x\frac {[A]}{[A]}\times \frac {[C]}{[D]}\times \frac {[D]}{[C]}=$
Fire is rapid oxidation, and an explosion is __ A) Always illegal B) Important C) A very rapid fire D) Unavoidable
15. What is the concentration of HCl $(M)$ in water if the solution is $36.0\% $ HCl by mass and has a density of $1.18g/mL$ A. 0.116 M B. 0.360 M C. 8.25 M D. 11.6 M E. 36.0 M
Which pair has the same empirical formula? $CH_{4}$ and $C_{2}H_{6}$ $NaCrO_{4}$ and $Na_{2}Cr_{2}O_{7}$ $C_{3}H_{6}O_{3}$ and $C_{2}H_{6}O_{2}$ $C_{2}H_{4}O_{2}$ and $C_{6}H_{12}O_{6}$
c. If a bronze statue grows darker in color over time, what color do you think tin oxide (SnO) is?
Multiple Choice 2 points A chemical reaction in which a larger molecule is built from smaller molecules is a(n) catabolic reaction. C synthesis reaction. exchange reaction. decomposition reaction.
How is energy changing when a match burns? Mechanical energy changes to heat energy and friction. Heat energy changes to chemical and light energy. Light energy changes to heat and chemical energy. Chemical energy changes to light
Multiple Choice 2 points Which of the following substances is an element? salt glucose iron water
Which of the following when mixed at equimolar concentrations, will result in the formation of a buffer solution? HCl and NaOH HClO and NaOH $HClO_{2}$ and $NaClO_{2}$ $HNO_{3}$ and $NaNO_{3}$
Which formula represents a nonpolar molecule containing polar covalent bonds?
