To the correct number of significant figures, the mass of exactly 400 atoms of magnesium is: 24.30 amu 09720 amu 97.20 amu 16.45 amu 0.06078 amu

Which of the following features are common to the elements in group VIIIA (18) of the periodic table? Select all that apply. Unfilled outer electron shell D Low boiling points D D High ionization energies High electronegativities OHigh melting points DVery low electronegativities Filled outer electron shell Relatively unreactive

QUESTION 4 OF 13 The octet rule describes the tendency of atoms to: Achieve a total of eight protons in their nucleus. Gain, lose, or share electrons to obtain a stable configuration of eight valence electrons. Form bonds only with elements from Group 8 (noble gases).

What is the stoichiometric coefficient of O_(2) 7 underline ( )FeS_(2)+underline ( )O_(2)arrow underline ( )Fe_(2)O_(3)+underline ( )SO_(2) 11 5 4 10

An instant cold pack works by dissolving ammonium nitrate into water. These cold packs use an __ process to create the sensation of cold by siphoning away heat from the surroundings. endothermic exothermic enthalpic calorimeter

Which of the following is the best summary of Avogadro's law? A. Every gas has a different volume at STP. B. The volume a gas occupies depends on gas type. C. Equal amounts of all gases have the same volume at the same conditions. D. Equal amounts of all gases occupy 224 L at all conditions.

Select the correctly balanced equation. NaN_(3)arrow 2Na+3N_(2) 2NaN_(3)arrow Na+3N_(2) 2NaN_(3)arrow 2Na+3N_(2) 2NaN_(3)arrow 2Na+N_(2)

Identify the properly written and balanced equation for the precipitation reaction between ammonium sulfide and cobalt(II) chloride. (NH_(4))_(2)S+2CoCl_(2)arrow CoS+NH_(4)Cl NH_(4)S+CoCl_(2)arrow 2CoS_(2)+2NH_(4)Cl (NH_(4))_(2)S+CoCl_(2)arrow CoS+2NH_(4)Cl NH_(4)S+CoClarrow CoS+NH_(4)Cl

Table 8.1 Synthesis of Copper Oxide from Copper Mass of empty crucible (g) & 35.000 Color of copper in crucible & redish orange Mass of crucible and copper (g) & 45.000 Observations during heating & it turned completely black after it was heated up Mass of crucible and copper oxide (g) & 47.518

A typical dose of loperamide for an adult is 4.0 mg. What mass of carbon atoms is there in a 4.0 mg dose of loperamide? (1 Point)

Hot Questions

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