rmal text BIUA Arial 17.2 + 2 . 3 .| 4 . in blue ink using complete sentences. 1. How is a physical change different from a chemical change? 2. How do you know a chemical reaction has happened? 3. Give an example of a chemical change. 4. How do you know this chemical reaction has taken place? 5. Name three different properties you can test before and after a chemical reaction to determine if a new substance was formed. 6. What does a catalyst do in a chemical reaction? 7. Are the number of atoms before and after a chemical reaction the same? Why? 8. What are two ways you can tell that the steel wool in the video underwent a chemical reaction? Support | Schoology Blog | PRIVACY POLI

rmal text BIUA Arial 17.2 + 2 . 3 .| 4 . in blue ink using complete sentences. 1. How is a physical change different from a chemical change? 2. How do you know a chemical reaction has happened? 3. Give an example of a chemical change. 4. How do you know this chemical reaction has taken place? 5. Name three different properties you can test before and after a chemical reaction to determine if a new substance was formed. 6. What does a catalyst do in a chemical reaction? 7. Are the number of atoms before and after a chemical reaction the same? Why? 8. What are two ways you can tell that the steel wool in the video underwent a chemical reaction? Support | Schoology Blog | PRIVACY POLI

Chemistry

10th Edition

ISBN:9781305957404

Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste

Chapter3: Stoichiometry

Section: Chapter Questions

Problem 13ALQ: What is true about the chemical properties of the product? a. The properties are more like chemical...

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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?
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Ma X ATM HOMEWO X #5112480241329813180832311&eISBN=9781305862883&id=1707785907&snapshotid=33... D21 Grades - X G when doe X References Submit Answer MindTap x G Match ea X Use the References to access important values if needed for this question. Under certain conditions, the substance hydrobromic acid can be broken down to form hydrogen and bromine. ervation of Mass: Macroscopic: This is group attempt 1 of 10 Autosaved at 7:17 PM ☆ If 22.3 grams of hydrobromic acid react to form 0.3 grams of hydrogen, how many grams of bromine must simultaneously be formed? grams bromine Ch.2: Ato- Q Search Regenerat
2. Carbon dioxide (CO2) forms when coal burns in the presence of oxygen. Which of the following is the BEST evidence that a chemical reaction occurs when the coal burns? a. Production of mechanical energy c. A new substance is produced b. Production of electricity d. Formation of precipitate 3.Which of these does NOT happen during a chemical change? a. New substances are formed with different chemical properties. b. Attractive force between atoms of molecule formed or break. c. The chemical properties of the substances before and after the reaction are the same d. Energy is always released or absorbed. 4. A granular substance is added to a liquid. Which of the following would supply evidence to propose a chemical change has taken place? a. The granules dissolve completely. c. The volume of the liquid increases. b. The liquid gives off heat. d. The granules become smaller. 5. Which of the following does NOT indicate a chemical change is occurring? a.…
C3H3 + O2→ b СО2 + H2O d a The chemical in the pink box is a... A. subscript В. соefficient C. reactant D. product The number in the green box is a... A. subscript B. coefficient C. reactant D. product The numbers in red boxes are... A. subscripts B. coefficients C. reactants D. products The chemicals in the purple box are... A. subscripts B. coefficients C. reactants D. products