A chemical reaction (also known as a chemical change) produces substances that are chemically different from the starting materials. An example of a chemical reaction is the formation of water from hydrogen and oxygen gas.In a physical change, a substance changes its physical appearance but not its chemical identity. An example of physical change is the formation of liquid water from solid water, a familiar process called melting. Physically, liquid water looks very different from solid water (ice) but the chemical identity, water, is the same for both. Part A Which of following changes that affect the composition of our atmosphere involve physical changes and which involve chemical reactions? Drag the appropriate items to their respective bins. View Available Hint(s) Reset Help Most of the ozone is created as a byproduct of human-created photochemical smog. Clouds form when water vapor in the air condenses. Carbon monoxide is produced by the combustion of gasoline. Water vapor forms from frost as the air temperature rises. Microbes decompose complex organic matter to release carbon dioxide and methane. Chemical reaction Physical change

A chemical reaction (also known as a chemical change) produces substances that are chemically different from the starting materials. An example of a chemical reaction is the formation of water from hydrogen and oxygen gas.In a physical change, a substance changes its physical appearance but not its chemical identity. An example of physical change is the formation of liquid water from solid water, a familiar process called melting. Physically, liquid water looks very different from solid water (ice) but the chemical identity, water, is the same for both. Part A Which of following changes that affect the composition of our atmosphere involve physical changes and which involve chemical reactions? Drag the appropriate items to their respective bins. View Available Hint(s) Reset Help Most of the ozone is created as a byproduct of human-created photochemical smog. Clouds form when water vapor in the air condenses. Carbon monoxide is produced by the combustion of gasoline. Water vapor forms from frost as the air temperature rises. Microbes decompose complex organic matter to release carbon dioxide and methane. Chemical reaction Physical change

World of Chemistry

7th Edition

ISBN:9780618562763

Author:Steven S. Zumdahl

Publisher:Steven S. Zumdahl

Chapter9: Chemical Quantities

Section: Chapter Questions

Problem 48A

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When camping in the mountains, you boil a pot of water on a campfire to make tea. Which of the following is a chemical change? (a) The water boils. (b) The campfire wood burns. (c) The tea dissolves in the hot water. (d) The pot melts from the heat of the fire.
hat do the coefficients of a balanced chemical equation tell us about the proportions in which atoms and molecules react on an individual (microscopic) basis?
Particles in the illustration below undergo a chemical change. Which among the remaining boxes, a through d, can represent the products of the chemical change? If a box cannot represent the products of the chemical change, explain why. a b c d
3.83 For the reaction of nitrogen, N2, and hydrogen, H2, to form ammonia, NH3, a student is attempting to draw a particulate diagram, as shown below. Did the student draw a correct representation of the reaction? If not, what was the error the student made?
In each case, describe the change as a chemical or physical change. Give a reason for your choice. Salt dissolves when you add it to water. Food is digested and metabolized in your body. Crystalline sugar is ground into a fine powder. When potassium is added to water there is a purplishpink flame and the water becomes basic (alkaline).
How do you distinguish (a) chemical properties from physical properties? (b) distillation from filtration? (c) a solute from a solution?
The boiling of water is aa. physical change because the water disappears.physical change because the gaseous water is chemically the same as the liquid.chemical change because heat is needed for the process to occur.chemical change because hydrogen and oxygen gases are formed from water.chemical and physical change. Explain your answer
Mixture is a combination of two or more substances that are not chemically combined. The substances are formed together but no new substance is formed. A mixture can be of any form. It may be solid, liquid or in gaseous form. Mixtures can be classified according to their appearance. Uniform mixtures or Homogenous Mixtures have substances that cannot be recognized because solutes completely dissolve in the solvent while Nonuniform or heterogeneous mixtures have components which can be identified easily. EXPERIMENT: Forming Mixtures A. Materials: Three glasses, water, teaspoon, flour, food color/soy sauce, cooking oil, pebbles/small stones B. Procedure: 1. Half-fill the four glasses with water. 2. Put the food color/soy sauce in one glass. Stir. Label it as "Set A. 3. Put a teaspoon of flour in the second glass. Stir. Label it as "Set B". 4. Put a teaspoon of cooking oil in the third glass. Stir. Label it as "Set C". 5. Put the pebbles/small stones and the flour in a plate or petri dish…
Classify the following materials as substances or mixtures: absolute (pure) alcohol, milk (as purchased in a store), copper wire, rust, barium bromide, concrete, baking soda, and baking powder. If they are mixtures, subclassify them as homogeneous or heterogeneous; if they are substances,subclassify them as compounds or elements.
1) Combination Reactions (A+ B à AB): Two elements (or simple compounds) become one compound. Mg(s) + O,(g) à MgO(s) SO((g) S(s) + O2(g) à 2) Decomposition Reactions (AB à A+ B or ABC à AC + BC): A compound becomes two or more elements (or simpler compounds). Н,О() а Н,(g) + 0,(g) CO,(g) CUCO;(s) à CuO(s) + 3) Single Replacement Reactions (A+ BC à AC + B): An element (a metal or a halogen) replaces another element (metal or halogen) in solution. Zn(s) + CUSO,(aq) à ZnSO̟(aq) + Cu(s) NaBr(aq) à NaClI(aq) + Br,(aq) Cl,(aq) + 4) Double Replacement Reactions (AB + CD à AD + CB): Two elements "switch" (metals replace each other or hydrogen and a metal replace each other). Nal(aq) + Pb(NO,),(aq) à NaNO,(aq) à PbI,(s) NaOH(aq) ӑ H,О() + NaCl{aq) НС(аq) + Reactions may be done in any order. You DO NOT have to indicate the phase(s) of the products. Record observation(s) and write the balanced chemical equation in Table 1. Reaction #1 has been done for you. 1. Using a test tube and dropper…
Which of the following is not a consequence of the Law of Conservation of Matter? It provides a basis for balancing chemical equations. It means that there will be no observable change in the quantity of matter during a chemical reaction. As a result, there will be the same number of moles on both the reactant and the product side of a balanced equation. It can be stated as “matter is neither created nor destroyed during a chemical reaction.
Is the decomposition of copper(II) sulfate hydrate a physical change or a chemical change?Explain.

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