4. In a mixture of hydrogen (H_(2)) and argon (Ar) gas, 15% of the total gas pressure is exerted by hydrogen. If the total pressure is 60 .0 atm, what pressure does the hydrogen exert? (Answer=9.0atm)
Which statement accurately describes part of the dissolving process of a polar solute in water? Solute molecules repel water molecules Water molecules surround solute molecules Water molecules are strongly attracted to nonpolar substances. Solute molecules remain concentrated in one part of the solvent
3. Write the formula for the following polyatomic ions. a. Calcium nitrate: b. Ammonium nitride: c. Sodium carbonate: d. Ammonium phosphate: e. Magnesium phosphate:
2. Write the name for the following ionic compounds. a. FeCl_(3) b. AgCl: c. ZnCl_(2)
8. Explain the rules used to assign oxidation numbers. __ 9. Why do some elements have multiple oxidation states? __
Which of the following is a possible way to describe the NO_(2) component in the reaction below? N_(2)(g)+2O_(2)(g)arrow 2NO_(2)(g) 1LNO_(2) 4 moles NO NO_(2) 2 molecules of NO_(2) 2 atoms NO_(2)
Question 1 (1 point) underline ( )H_(2)+underline ( )Cl_(2)arrow underline ( )HCl
3) (4 pts) Give the structures (condensed or line-angle structures) of the isomers of C_(4)H_(10) and name each.
(b) (15 points) If 32.05 ml of the NaOH standard are found to neutralize 25.00 ml of an unknown acid solution, determine the molarity of the unknown.
¿Cuáles son los conceptos básicos de la química? SELECCIONE TODAS LAS QUE CORRESPONDAN a Productos químicos b Reacciones químicas do Átomos y moléculas d Energía
Given the following reactions and corresponding $\Delta H$ values, find the $\Delta H$ (to the nearest whole \#) for the reaction: $H_{2}SO_{4}(l)\rightarrow SO_{3}(g)+H_{2}O(g)$ $H_{2}S(g)+2O_{2}(g)\rightarrow H_{2}SO_{4}(l)$ $\Delta H=-235kJ$ $H_{2}S(g)+2O_{2}(g)\rightarrow SO_{3}(g)+H_{2}O(l)$ $\Delta H=-207kJ$ $H_{2}O(l)\rightarrow H_{2}O(g)$ $\Delta H=44kJ$ $\square $
Convert $4.68\times 10^{25}$ atoms $PBr_{3}$ to mol
Which of the following best describes a mixture? a material that is made up of many molecules a substance that can be changed into another substance a material that contains two or more substances a substance that has been broken down into Its smallest parts
What is used to of a hope of sixes in a a compound heard on the chermal reme? the periodic table prefixes chemical symbols the IUP AC
40. Using the hyphen form of symbol writing write the name of this atom. ${}_{9}^{19}F^{-1}$
Which of the following will not increase 1 point the rate of a chemical reaction? increasing surface area stirring decreasing the temperature increasing the concentration A __ is a substance that increases the rate of a reaction without being consumed. __ 1 point A(n) __ slows down the rate of a reaction. __ is a substance that 1 point
Use molecular orbital theory to determine the bond order in $H_{2}$ o 2 1 3
What partie should be used for the caygin akan when maning the characal formuls $SO_{2}?$ $\square $ disappointed mono- pent.
What happens to the pH of a buffer solution if it is diluted by adding more water? A) pH increases B) pH decreases C) pH remains the same D) pH becomes 7 E) It depends on the starting volume of the buffer
What is the chemical formula for lead (II)sulfate? $Pb_{3}(SO_{4})_{2}$ $PbSO_{4}$ $Pb_{3}(SO_{3})_{2}$ $PbSO_{3}$
