If a reaction starts with 4 Cu atoms, 5 O atoms, and 10 H atoms, what is known about the products?A.The products will contain no oxygen because it is a gas.B.The products will contain 4 Cu atoms, 5 O atoms, and 10 H atoms.C.The products will contain 19 atoms of unknown type.D.The products will contain 4 Cu atoms and 5 H2O molecules.

If the reactants of a reaction have one S and four O atoms, what will the products have?A.Four S atoms and one O atomB.One S atom and one O atomC.One S atom and four O atomsD.Four S atoms and four O atomsSUBMITarrow_backPREVIOUS

A chemical reaction is shown below.​​Fe + H2O → Fe3O4 + H2​​Unit 2 Review​​What are the products in the equation?​​A Fe3O4 only​​B Fe only​​C Fe and H2O​​D Fe3O4 and H2​​13 Which of the following occurrences indicates that a chemical reaction has taken place?​​A An odor is produced by burning a sugar cube.​​B A puddle is produced by melting an ice cube.​​C A loud noise is produced by crushing a can.​​D A shard of glass is produced by breaking a bottle.​​Critical Thinking​​Answer the following questions in the space provided.​​14 List three properties of metals that nonmetals typically do not have.​​Describe where metals and nonmetals are found on the periodic table.​​What is the name for elements that have some properties of metals and some properties of nonmetals?​

Aluminum reacts with oxygen gas in order to produce aluminum oxide. How many molecules of aluminum oxide will be there if there are 7 moles of oxygen gas during the reaction

The law of conservation of mass states that:The mass of products is greater than the mass of reactantsThe mass of products is less than the mass of reactantsThe mass of products is equal to the mass of reactantsThe mass of products can be either greater than or less than the mass of reactants2How many grams of copper oxide are produced during the following reaction (assuming it is complete)?: 2Cu (6.35 g) + O2 (1.60 g) → 2CuO7.95 g4.75 g6.35 g15.9 g3In a chemical reaction, the mass of products is often lower than expected. There are several explanations for why this might be the case. Which of the following is not a possible explanation?Some of the reactants may have reacted in different unexpected waysThe mass of the reactants is greater than the mass of the productsThe reaction may not have finishedSome of the product may have been lost during removal4Which of the following is a balanced equation for the formation of water from hydrogen and oxygen?2H2 + O2 → H2O2H2 + 2O2 → 2H2O2H2 + O2 → 2H2OH2 + O2 → H2O25Which of the following is a balanced equation for the reaction of hydrogen and chlorine?H2 + Cl2 → HCl2H + 2Cl → 2HClH2 + Cl2 → 2HClH + Cl → HCl

An unknown element was collected during a chemical reaction. The sample of the unknown element with a mass of 4.00 g was then allowed to react with excess oxygen, forming an oxide with a mass of 6.63 g. The oxide contains an equal amount (in mol) of both elements (the unknown element and oxygen). Identify the unknown element.