Which of the following substances contains a nonpolar covalent bond? PH_(3) KCI CaF_(2) H_(2)S IBr
A sodium atom has an atomic weight of 23 (atomic weight unit)and 11 protons. The number of neutrons in this atom is: A a-12, B b-11, C c-23, D d-34
A 0.40 g sample of vegetable oil is placed in a calorimeter. When the sample is burned, 193 kJ is given off. Part A What is the energy value (kcal/g) for the oil? Express your answer to two significant figures.
35.3 g of MgCl_(2) in the preparation of a 4.3 percent by mass solution. Round your answer to 2 significant digits. square g
What's the molecular geometry of SO_(3) trigonal planar tetrahedral trigonal pyramidal see-saw
A Gram positive reaction gives a pink/red color. True False
No reaction occurred PbCl_(2)(aq) PbCl_(2)(s) PbCl(s) Pb_(2)Cl(s) NaNO_(3)(aq) NaNO_(3)(s) Na_(2)NO_(3)(aq) Na(NO_(3))_(2)(s)
Which is a property of an ionic compound? conducts electricity in the solid phase occur when atoms share electrons brittle crystalline structure low melting point
35. Which of the variables in the Equation of Exchange (MVDPQ) is the one that matters because it is the only one that is real? a) M b) V c) P d) Q
7. When given a simple chemical reaction, identify the reactant(s) and product(s). (Try the examples below.) 2H_(2)+O_(2)arrow 2H_(2)O b C_(3)H_(8)+5O_(2)arrow 3CO_(2)+4H_(2)O C. NH_(3)+5O_(2)arrow 4NO+6H_(2)O
A synthetic lubricant presently used with ternary blends containing HCFCs is known as __ Alkylbenezene Polyalkylene Polywannacracker Polyolester
Which of the following equations is correct? $TC=FC+VC$ $TC=FC-VC$ $TC=MC-VC$ $TC=FC\times VC$
vphich pure substance can be classified as an element? $H_{2}$ $NO_{3}$ NaCl $H_{2}SO_{4}$
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? $K_{a}HF=6.76\times 10^{-4}$ a. 1.74 b. 5.75 c. 8.25 d. 12.26
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 $mol/kg$
How many valence electrons are in the acetate ion $C_{2}H_{3}O_{2}^{-}$ $\square $
Which statement would be the most useful for deriving the ideal I gas law? Volume is directly proportional to the number of moles. Volume is inversely proportional to the temperature. Pressure is directly proportional to the volume. Pressure is inversely proportional to the number of moles.
Hydrogen sulfide is: A) Odorless B) Colorless C) Not flammable D) Red in color
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
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
