How many valence electrons are in the acetate ion C_(2)H_(3)O_(2)^- square
What is the approximate pH at the equivalence point of a weak acid- strong base titration if 25 mL of aqueous HF requires ; 30.00 mL of 0.400 M NaOH? K_(a)HF=6.76times 10^-4 a. 1.74 b. 5.75 c. 8.25 d. 12.26
vphich pure substance can be classified as an element? H_(2) NO_(3) NaCl H_(2)SO_(4)
Question 3 of 10 What property is used to calculate the pH of a solution? A. The hydrogen ion concentration in ppm B. The hydrogen ion concentration in mg/dL C. The hydrogen ion concentration in mol/L D. The hydrogen ion concentration in mol/kg
Give the IUPAC name for the organic compound shown: CH_(3)-CH-CH-CH_(2)-COOH chloro-isopropyl alcohol 3-chloropentanoic acid 3-chloropentanone 2-chloropentanal
Question 18 of 20 What is the name for Mg_(3)N_(2) A. Magnesium nitride B. Magnesium dinitride C. Trimagnesium dinitride D. Dimagnesium trinitride
Calculate the predicted melting point for iron. Fe given the melting points of ruthenium, Ru, (2310^circ C) and osmium, Os. (3045^circ C) 2678^circ C 735^circ C 5355^circ C 1575^circ C 3780^circ C
Which of the following is a radioactive nonmetal? Ra At Po Rn none of the above
What is the maximum number of electrons in a 4d orbital? 1 5 10 2 none of the above
Which of the following is true of an electron orbit? An electron orbit is a fixed energy state. An electron orbit increases in size with greater energy. An electron orbit represents an energy level. An electron orbit may contain eight electrons. all of the above
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?
