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
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.
