(a)
Interpretation: The observation during the given chemical change to support the fact needs to be described.
An antacid tablet was dropped into water.
Concept Introduction: When a substance changes its appearance or change in the state takes place and there is no change in its chemical composition, the change is said to be physical. On the other hand, when there is a change in the chemical composition of a substance or a new substance is formed after a
(a)
Explanation of Solution
When the antacid tablet is dropped in water, it gets dissolved in it. Antacid tablets contain sodium bicarbonate which reacts with hydrogen ions in the water to form carbon dioxide. This carbon dioxide formation causes effervescence in water and gives a clue of chemical change.
(b)
Interpretation: The observation during the given chemical change to support the fact needs to be described.
A ring of scum forms around a bathtub
Concept Introduction: When a substance changes its appearance or change in the state takes place and there is no change in its chemical composition, the change is said to be physical. On the other hand, when there is a change in the chemical composition of a substance or a new substance is formed after a chemical reaction, it is known as a chemical change.
(b)
Explanation of Solution
The formation of a ring of scum around a bathtub is due to a precipitation reaction. Here, the formation of a solid that settles out of a liquid mixture cause formation of a ring of scum. Thus, the formation of precipitate shows there is a chemical change.
(c)
Interpretation: The observation during the given chemical change to support the fact needs to be described.
Rusting of iron
Concept Introduction: When a substance changes its appearance or change in the state takes place and there is no change in its chemical composition, the change is said to be physical. On the other hand, when there is a change in the chemical composition of a substance or a new substance is formed after a chemical reaction, it is known as a chemical change.
(c)
Explanation of Solution
Rusting of iron is due to corrosion when the iron is exposed to moisture in the air. This results in the formation of iron oxide. Here, a new substance is formed thus, it is a chemical change. Iron oxide so formed is reddish-brown and also known as rust.
(d)
Interpretation: The observation during the given chemical change to support the fact needs to be described.
Explosion of firecracker
Concept Introduction: When a substance changes its appearance or change in the state takes place and there is no change in its chemical composition, the change is said to be physical. On the other hand, when there is a change in the chemical composition of a substance or a new substance is formed after a chemical reaction, it is known as a chemical change.
(d)
Explanation of Solution
The explosion of a firecracker involves the production of heat, light, and sound. The explosion of the firecracker results in an exothermic
(e)
Interpretation: The observation during the given chemical change to support the fact needs to be described.
Formation of bubbles when hydrogen peroxide is poured onto an open wound.
Concept Introduction: When a substance changes its appearance or change in the state takes place and there is no change in its chemical composition, the change is said to be physical. On the other hand, when there is a change in the chemical composition of a substance or a new substance is formed after a chemical reaction, it is known as a chemical change.
(e)
Explanation of Solution
When hydrogen peroxide is poured onto an open wound, the formation of bubbles shows a chemical reaction. The bubbles are due to the release of oxygen gas. Here, oxygen gas is produced due to the breaking of hydrogen peroxide in the presence of enzyme catalyzes.
(f)
Interpretation: The observation during the given chemical change to support the fact needs to be described.
Cooking a hamburger.
Concept Introduction: When a substance changes its appearance or change in the state takes place and there is no change in its chemical composition, the change is said to be physical. On the other hand, when there is a change in the chemical composition of a substance or a new substance is formed after a chemical reaction, it is known as a chemical change.
(f)
Explanation of Solution
When a hamburger is cooked, a new substance is formed from raw materials. Here, new species are formed which cannot be converted back into original ingredients thus, it is a chemical change.
Chapter 2 Solutions
Chemistry 2012 Student Edition (hard Cover) Grade 11
- Rank the following compounds most to least acidic: a) О OH 요애 OH .OH flow flow О F F F F OH F b) Ha EN-Ha CI Ha F F CI Haarrow_forwarda) b) Provide arrows to show the mechanisms and then predict the products of the following acid base reaction. Use pKas to determine which way the reaction will favor (Hint: the lower pka acid will want to dissociate) Дон OH Ha OH NH2 c) H H-O-Harrow_forwardMATERIALS. Differentiate between interstitial position and reticular position.arrow_forward
- For each of the following, indicate whether the arrow pushes are valid. Do we break any rules via the arrows? If not, indicate what is incorrect. Hint: Draw the product of the arrow and see if you still have a valid structure. a. b. N OH C. H N + H d. e. f. مه N COHarrow_forwardDecide which is the most acidic proton (H) in the following compounds. Which one can be removed most easily? a) Ha Нь b) Ha Нь c) CI CI Cl Ha Ньarrow_forwardProvide all of the possible resonanse structures for the following compounds. Indicate which is the major contributor when applicable. Show your arrow pushing. a) H+ O: b) c) : N :O : : 0 d) e) Оarrow_forward
- Draw e arrows between the following resonance structures: a) b) : 0: :0: c) :0: N t : 0: بار Narrow_forwardDraw the major substitution products you would expect for the reaction shown below. If substitution would not occur at a significant rate under these conditions, check the box underneath the drawing area instead. Be sure you use wedge and dash bonds where necessary, for example to distinguish between major products. Note for advanced students: you can assume that the reaction mixture is heated mildly, somewhat above room temperature, but strong heat or reflux is not used. Cl Substitution will not occur at a significant rate. Explanation Check :☐ O-CH + Х Click and drag to start drawing a structure.arrow_forwardDraw the major substitution products you would expect for the reaction shown below. If substitution would not occur at a significant rate under these conditions, check the box underneath the drawing area instead. Be sure you use wedge and dash bonds where necessary, for example to distinguish between major products. Note for advanced students: you can assume that the reaction mixture is heated mildly, somewhat above room temperature, but strong heat or reflux is not used. Cl C O Substitution will not occur at a significant rate. Explanation Check + O-CH3 Х Click and drag to start drawing a structure.arrow_forward
- ✓ aw the major substitution products you would expect for the reaction shown below. If substitution would not occur at a significant rate under these conditions, check the box underneath the drawing area instead. Be sure you use wedge and dash bonds where necessary, for example to distinguish between major products. Note for advanced students: you can assume that the reaction mixture is heated mildly, somewhat above room temperature, but strong heat or reflux is not used. C Cl HO–CH O Substitution will not occur at a significant rate. Explanation Check -3 ☐ : + D Click and drag to start drawing a structure. © 2025 McGraw Hill LLC. All Rights Reserved. Terms of Use Privacy Cearrow_forwardPlease correct answer and don't used hand raitingarrow_forwardDon't used hand raiting and don't used Ai solutionarrow_forward
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