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
What is the major ion in seawater? sodium chloride magnesium sulfate
5. How can 100. mL of sodium hydroxide solution with a pH of 13.00 be converted to a sodium hydroxide solution with a pH of 12.00 ? (A) By diluting the solution with distilled water to a total volume of 200 mL (B) By diluting the solution with distilled water to a total volume of 1.00 L (C) By adding 100 mL of 0.10 MHCI (D) By adding 100 mL of 0.10 MNaOH
12. How does the concept of electron transfer explain why sodium and chlorine react to produce sodium chloride?(Hint: Think about the movement of electrons between sodium and chlorine atoms during the reaction.)
2. Use Passage 1 to answer question below. Suppose that in Experiment 2 a solution at a pH of 7.5 had been tested. Based on the results of Experiment 2, the percent recovery of cadmium for that solution would most likely have been: F. between $48\% $ and $80\% $ G. between $80\% $ and $88\% $ H. between $88\% $ and $95\% $ J. between $95\% $ and $100\% $ F G. H. J.
1.Use Passage 1 to answer question below. Based on the description of Experiment 1, when was the graphene separated from the sample liquid by centrifugation? A. Immediately before placing the sample in the water bath B. Immediately after removing the sample from the water bath C. Immediately before the percent recovery of the cadmium was determined D. Immediately after the percent recovery of the cad- mium was determined A B C D
Which statement about asbestos fibers is correct? A. All asbestos fibers are visible without magnification B. Asbestos fibers can be identified by color and texture alone C. Some asbestos fibers are extremely small and require laboratory testing to confirm their presence D. Asbestos fibers are always thicker than a human hair
Which of the following statements describes how water differs greatly from many other substances? It is less dense in its solid form than liquid form. It is a polar covalent molecule. It can change to solid liquid and gas phases. It is comprised of two different elements.
Name the following ionic compounds. Make sure you are in text mode $(''Tt'')$ Do NOT put a space between metal and charge in parentheses if naming a Type II metal ionic compound (i.e. iron(III)) a. $CoCl_{2}$ $\square $
3. How many grams of $Fe_{2}(SO_{4})_{3}$ will be produced from 4.25 moles of Fe? $2Fe+3H_{2}SO_{4}\rightarrow 1Fe_{2}(SO_{4})_{3}+3H_{2}$
Red litmus paper turning blue indicates the prescence of __ ? $Ni(II)$ $Ca(II)$ $Fe(III)$ Ammonium Ion
