Chemistry Questions
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Metal X replaces the ions of metal Y from solution, but it cannot replace the ions of metal Z from solution. The order of these metals should have in the activity series (from top to bottom) isa. X, Y, Zb. Z, X, Yc. Y, X, Zd. Z, Y, X
What follows an element's symbol in a chemical formula to indicate the number of atoms of that element in one molecule of the compound?a. charge signb. superscripted numberc. number in parenthesesd. subscripted number
What is the correct name for the NO₃⁻ ion?a. nitrateb. nitritec. nitrided. nitrogen oxide
Which equation is not balanced?a. 2H₂+O₂→ 2H₂Ob. 4H₂+2O₂→4H₂Oc. H₂+H₂+O₂→H₂O+H₂Od. 2H₂+O₂→H₂O
Which of the following is true regarding double-displacement reactions?a. Two products are formedb. The ions of the two reactants must be exchanged.c. A precipitate may formd. All of the above
What is the correct name for the compound Ni₂O₃ using the Stock system?a. nickel(II) oxideb. dinickel trioxidec. nickel trioxided. nickel(III) oxide
What is the total number of molecules that is represented by the following chemical equation?NH₄NO₂→ N₂+2H₂Oa. 3b. 4c. 8d. 16
What is the correct name for the acid CH₃COOH?a. carbonic acidb. carbonate acidc. acetic acidd. acetous acid
What is the empirical formula for a compound that contains 12.61% Li, 29.17% S, and 58.21% O?a. LiSO₂b. LiS₂O₆c. Li₂SO₄d. Li₂SO₃
What is the correct name for the compound P₂Cl₄?a. phosphorus chlorideb. phosphorus tetrachloridec. diphosphorus chlorided. diphosphorous tetrachloride
What is the correct formula for copper(I) cyanide?a. CuCyb. CuCy₂c. CuCNd. Cu₂CN
What is the correct notation for a calcium ion whose outer shell is a full octet?a. Ca¹⁺b. Ca²⁺c. Ca¹⁻d. Ca²⁻
What is the correct formula for the compound platinum(VI) fluoride?a. PtF₃b. PtF₆c. Pt₆F₂d. Pt₆F
Which equation below violates the law of conservation of mass?a. 2H₂+O₂→ 2H₂Ob. KCl+Br₂→KBr+Cl₂c. 2Fe₂O₃+3C→4Fe+3CO₂d. Na₂CO₃+2HCl→2NaCl+H₂O+CO₂
You mix solution A with solution B in a beaker. Which of the following observations does not help you prove that a chemical reaction has occurred?a. The beaker becomes warmb. You see gas bubble out of solutionc. Solution A, solution B, and the mixture are all yellowd. None of the above; all help prove that a chemical reaction has occurred
Which of the following molecular formulas does not have the corresponding empirical formula XY₂Z₂?a. X₂Y₄Z₂b. XYZc. X₆Y₁₂Z₆d. X₃Y₆Z₃
Which of the following indicates that a chemical equation is balanced?a. The numbers of atoms of each element are the same on both sides of the equationb. All of the coefficients are the samec. The numbers of molecules on each side of the equation are equald. The sums of the coefficients on each side of the equation are equal
How many moles of compound are there in 15.0g of potassium dichromate, K₂Cr₂O₇?(The molar mass of K₂Cr₂O₇ is 294.2g)a. 0.0510 molb. 11.0 molc. 15.0 mold. 294 mol
Oxidation numbers are used to indicate thea. charge on an ionb. number of atoms or ions in a compoundc. type of bond holding particles together in a compoundd. distribution of electrons among the bonded particles in a compound
The formula mass of any compound is described in units of a. gramsb. AMUc. molesd. grams per mole