How much do you already know about Hess's law?

Consider the reaction N_(2)(g)+3H_(2)(g)arrow 2NH_(3)(g) Using the standard thermodynamic data in the tables linked above, calculate Delta G_(rxn) for this reaction at 298.15K if the pressure of each gas is 45.27 mm Hg. ANSWER: square kJ/mol

Po-214 Express your answer as a nuclear equation. square D A chemical reaction does not occur for this question.

11. Complete the flowchart for balancing equations. Determine the correct formulas and physical states for the __ and __ . Write a __ with the formulas for the reactants on the left and the formulas for the products on the right of a yields sign Count the number of __ of each element in the reactants and in the products. Balance the number of atoms of the elements on the two sides of the equation by placing __ in front of formulas.Never try to balance an equation by changing the __ in formulas. Check each atom or polyatomic ion to be sure the equation is __ , and make sure that all coefficients

Which of the following properties generally decreases from left to right across a period (from potassium to bromine)? (A) Electronegativity (B) Electron affinity (C) Atomic number (D) Atomic radius (E) Maximum value of oxidation number

4. Some clothes, like nylon and polyester are. __ synthetic natural made from food

8. Na+H_(2)Oarrow NaOH+H_(2) 9. C_(2)H_(6)+O_(2)arrow CO_(2)+H_(2)O 10. HgOarrow Hg+O_(2) 11. CaCl_(2)+Na_(3)PO_(4)arrow NaCl+Ca_(3)(PO_(4))_(2) 12. N_(2)O_(5)+H_(2)Oarrow HNO_(3) 13. Mg+CuCl_(2)arrow MgCl_(2)+Cu 8. 9. 10. 11. 12. 13.

Compounds can change the electrical characteristics of an individual atom. For example,the insulating aluminum- oxide compound is very difficult to break and it often results in the overheating of aluminum conductors at their terminals. True False

Atoms strive for chemical stability, which is the condition where the valence shell is completely filled This is often accomplished by combining atoms together to produce a compound atom. True False

Which of the following substances would make a firework explode with a greenish flame? Copper (II) Chloride Copper (I) Chloride Copper (II) Oxide All of them

Hot Questions

How many protons are in an atom of carbon with 7 neutrons? a) 6 b) 7 c) 12.01 d) 13 e) None of the above

How many electrons are in the element potassium with 20 neutrons? a) 19 b) 20 c) 39 d) 39.10 e) None of the above

An erlenmeyer flask has a calibration of 50 mL. To what value can you estimate a measured volume? the nearest 0.01 mL the nearest 1 mL the nearest 0.1 mL the nearest 10 mL

2. Can you determine conclusively that an unknown substance contains only magnetite by using only a magnet? Explain your answer. __

Before you go, which type of molecule would you choose to be the anode in a lithium battery? a) The metal with the most negative potential b) It does not matter since lithium's potential is so negative c) The metal with the most positive potential d) Another lithium compound

$2Fe_{2}O_{3}(s)+3C(s)\rightarrow 4Fe(s)+3CO_{2}(g)$ Calculate the mass of iron produced from the complete reaction of 64.0 grams of iron (III)oxide. 89.5 g Fe 22.48 Fe 11.2 g Fe 44.88 Fe 107 g Fe

QUESTION Q Which of the following is true concerning mass number? ANSWER Using mass number notation, we can identify the number of protons. electrons.and neutrons. Isotopes differ in their numbers of electrons. The mass number is equal to the number of protons. Thus, the mass number of Helium is 2. The mass of electrons contributes significantly to mass number. IDONT KNOWYET

Multiple Choice Question If phenol red is added to a solution with a pH of 9.0, it will appear __ pink-red yellow

What precipitate forms when mixing silver(I)nitrate and sodium chloride? silver(I) chloride sodium nitrate no precipitate forms

Which of these equations correctly expresses the self-ionization of water? $H_{2}O+H_{3}O^{+}\leftrightarrow H_{2}O+OH^{-}$ $H_{2}O+H_{2}O\leftrightarrow 2OH^{-}$ $H_{2}O+H_{2}O\leftrightarrow 2H_{3}O^{-}$ $H_{2}O+H_{2}O\leftrightarrow H_{3}O^{+}+OH^{-}$