HANHNGUYEN-25001-Chemical Equations Lab Report(1)

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Dallas County Community College *

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1411

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Chemistry

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Dec 6, 2023

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Name: _______________ Date: _________ Section: ________ CHEMICAL EQUATIONS: A Study Assignment P RE -L AB Q UESTIONS Note: Don’t worry if you can’t type subscripts. For example, you can write water as H2O. Just remember that when hand-writing formulas, subscripts should be written like this: H 2 O 1 a) Complete the following “word equation” describing the products of an acid-base neutralization reaction: Acid + Base  ____ salt ______ + ______ water _____ 1 b) Write a balanced chemical equation for the reaction between sulfuric acid and aqueous potassium hydroxide. ___2KOH______ + ___H2SO4____  ____K2SO4_____ + _______2_H20__ 2. Complete the following word equation describing the burning in air of a hydrocarbon: Hydrocarbon + ___2O2_______  ___CO2_______ + ___2H20_______ 3. Write a balanced chemical equation for the burning in air of ethane, C 2 H 6 . _____C2H6____ + ___O2______  __2CO2_______ + _______3H20___ 4. Predict the products and write a balanced chemical equation for the double displacement reaction between aqueous lithium sulfate, Li 2 SO 4 and aqueous lead(II) nitrate, Pb(NO 3 ) 2 . Remember to include state symbols to show when a precipitate forms. Tip: When sulfate pairs with lead(II), the resulting compound is insoluble. ___Li2SO4______ + ______Pb(NO3)2___  ___2LiNO3______ + ____PbSO4______ Brookhaven College Chemistry – v3 Page 1 of 7 11/6/2019

Name: ___________________Date: ______ Section: ______ CHEMICAL EQUATIONS: A Study Assignment W ORKSHEET Instructions for completing the lab worksheet In today’s lab you will practice writing and balancing chemical equations. In Section A, you are given the skeletal equation and asked to balance it. In Section B, you are given the formulas of the reactants and must predict the products of the reaction and balance the equation. In Section C, you must determine the correct formulas of both the reactants and products and then balance the equation. Remember:  When writing a chemical equation, it is NEVER okay to change a correct formula, add or subtract a substance just to make the equation balance.  All you may do to balance an equation is add coefficients. o Write the coefficient on the line in front of the formulas.  Do not try to balance an equation until you have determined the correct formulas of the reactants and products.  Refer to the solubility rules (Table 2) to predict whether a precipitate will form during double displacement reactions. Use state symbols to show if a precipitate formed. Note: Don’t worry if you can’t type subscripts. For example, you can type water as H2O. Just remember that when hand-writing formulas, subscripts should be written like this: H 2 O. You can use “=” to represent an arrow if you do not know how to type an arrow. Section A Balance the following chemical equations. Write the word “Balanced” if the equation is already balanced. 1. Synthesis Reactions a) _____2_ H 2 (g) + ______ O 2 (g)  ___2___ H 2 O (l) b) _____2_ NH 3 (g) + ______ H 2 SO 4 (aq)  ______ (NH 4 ) 2 SO 4 (aq) Brookhaven College Chemistry – v3 Page 2 of 7 11/6/2019

Decomposition Reactions a) _____10_ H 2 O 2 (l)  ______ H 2 O (l) + ______10 O 2 (g) b) ______ CaCO 3 (s)  ______ CaO (s) + ______ CO 2 (g) 2. Single Displacement Reactions a) ______ Mg (s) + ___2___ HCl (aq)  ______ MgCl 2 (aq) + ______ H 2 (g) b) ______2 Na (s) + ____2__ H 2 O (l)  ____2__ NaOH (aq) + ______ H 2 (g) 3. Double Displacement Reactions a) ______ AgNO 3 (aq) + ______ NaCl (aq)  ______ AgCl (s) + ______ NaNO 3 (aq) b) ______ H 2 SO 4 (aq) + ____2__ NaOH (aq)  ______ Na 2 SO 4 (aq) + _____2_ H 2 O (l) Brookhaven College Chemistry – v3 Page 3 of 7 11/6/2019

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