Which of the following is indisputable evidence that a chemical reaction took place?  Group of answer choices A solid substance glows cherry red when heated None of these Bubbles formed in a liquid when heated Two liquids are mixed and the resulting solution grows cold A solid forms in a liquid as the temperature drops

Find the expected mass of calcium carbonate

Which of the following is always a reactant in a combustion reaction? C D A nitrogen a soluble compound an insoluble compound oxygen

Classify each chemical reaction: type of reaction (check all that apply) reaction combination precipitation single replacement O combustion HCI(aq) + NaOH (aq) NaCl(aq) + н,о() double replacement acid-base decomposition combination precipitation single replacement O combustion 2Na (s) + F, (g) - 2NaF (s) double replacement acid-base decomposition combination precipitation single replacement combustion 2CH,CH, (g) + 70, (g) 4CO, (g) + 6H,0(g) double replacement acid-base decomposition combination precipitation single replacement combustion Na, S (aq) + FeCl, (aq) → 2NaCI(aq) + FeS (s) double replacement acid-base decomposition ? O O O

You must show your written work to earn points for this question. Balance the following reaction in acid, fill in the blanks for the missing coefficients, then answer the following questions. Blank 1 Br₂+ Blank 2 S02 → Blank 3 S04² + Blank 4 Br What side are the waters on? (products or reactants) Blank 5 What is the coefficient in front of H₂O? Blank 6 What side are the H+ on? (products or reactants) Blank 7 What is the coefficient in front of H+? Blank 8

Write balanced chemical equations for each of the acid-base reactions described below. a) Aqueous solutions of HClO and LiOH are mixed Enter your chemical notation here b) Aqueous NaOH is mixed with an aqueous solution of HNO3 Enter your chemical notation here c) Aqueous Ba(OH)₂ is reacted with two equivalents of gaseous HC1 Enter your chemical notation here

I need help with all three reactions