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Chapter 1: Problem 3

List as many chemical reactions you can think of that are part of your everyday life. Explain.

Short Answer

Expert verified
Some everyday chemical reactions include: 1. Rusting of Iron: Iron reacts with oxygen and water to form hydrated iron(III) oxide (Fe2O3.xH2O), causing corrosion of iron objects like gates, bicycles, and cars. 2. Respiration: Glucose (C6H12O6) reacts with oxygen (O2) to produce carbon dioxide (CO2), water (H2O), and energy in living organisms. \(C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + energy\) 3. Photosynthesis: Green plants, algae, and some bacteria convert sunlight energy into glucose (C6H12O6) and oxygen (O2) using carbon dioxide (CO2) and water (H2O). \(6CO_2 + 6H_2O + energy \rightarrow C_6H_{12}O_6 + 6O_2\) 4. Combustion: Fuels like propane (C3H8) burn in the presence of oxygen (O2) to produce carbon dioxide (CO2), water (H2O), and energy, as seen in car engines, fireplaces, and gas stoves. \(C_3H_8 + 5O_2 \rightarrow 3CO_2 + 4H_2O + energy\) 5. Neutralization: Acids and bases react to form salt and water, like when using antacid tablets for heartburn relief. \(HCl + NaOH \rightarrow NaCl + H_2O\) 6. Fermentation: Sugar is converted to acids, gases, or alcohol by microorganisms in anaerobic conditions, as seen in making bread, beer, and wine. \(C_6H_{12}O_6 \rightarrow 2C_2H_5OH + 2CO_2\)

Step by step solution

01

1. Rusting of Iron

Rusting is an oxidation reaction where iron reacts with oxygen and water to form hydrated iron(III) oxide (Fe2O3.xH2O), which we commonly call as rust. This reaction slowly deteriorates the iron surface, causing the appearance of reddish-brown flakes. Rusting leads to the corrosion of various objects made of iron, such as gates, bicycles, and cars.
02

2. Respiration

Respiration is a chemical process that is vital for all living organisms. During respiration, glucose (C6H12O6) reacts with oxygen (O2) to produce carbon dioxide (CO2), water (H2O), and energy in the form of adenosine triphosphate (ATP). The balanced equation for this reaction is: \(C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + energy\)
03

3. Photosynthesis

Photosynthesis is the process by which green plants, algae, and some bacteria convert energy from sunlight into chemical energy. During photosynthesis, carbon dioxide (CO2) and water (H2O) come together with sunlight to produce glucose (C6H12O6) and oxygen (O2). The balanced equation for this reaction is: \(6CO_2 + 6H_2O + energy \rightarrow C_6H_{12}O_6 + 6O_2\)
04

4. Combustion

Combustion is a chemical reaction that produces heat and light when a fuel reacts with oxygen. For example, when propane (C3H8) is burned, it combines with oxygen (O2) to produce carbon dioxide (CO2) and water (H2O). The balanced equation for the combustion of propane is: \(C_3H_8 + 5O_2 \rightarrow 3CO_2 + 4H_2O + energy\) In everyday life, combustion reactions occur in car engines, fireplaces, and gas stoves.
05

5. Neutralization

A neutralization reaction occurs when an acid reacts with a base to produce salt and water. For example, when hydrochloric acid (HCl) reacts with sodium hydroxide (NaOH), salt (sodium chloride, NaCl) and water (H2O) are produced. The balanced equation for this reaction is: \(HCl + NaOH \rightarrow NaCl + H_2O\) Neutralization reactions often occur when using antacid tablets to alleviate heartburn or indigestion.
06

6. Fermentation

Fermentation is a biological process involving the conversion of sugar to acids, gases, or alcohol by microorganisms like yeast, under anaerobic conditions. One common example of fermentation is alcohol production. In this process, yeast breaks down glucose (C6H12O6) into ethanol (C2H5OH) and carbon dioxide (CO2). The balanced equation for this reaction is: \(C_6H_{12}O_6 \rightarrow 2C_2H_5OH + 2CO_2\) Fermentation occurs in everyday life in the making of bread, beer, and wine.

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Key Concepts

These are the key concepts you need to understand to accurately answer the question.

Oxidation Reaction
Oxidation reactions are chemical processes where a substance loses electrons, often associated with gaining oxygen. An everyday example of an oxidation reaction is the rusting of iron. Oxygen from the air reacts with iron, particularly in the presence of water or moisture, to form iron oxide or rust. This reaction not only affects structures and vehicles by weakening the iron, but it also serves as a real-world indicator of how chemical reactions directly impact the objects around us.

Understanding oxidation is crucial as it also pertains to other processes like fire prevention, where materials are treated to resist oxidation and thus reduce flammability.
Respiration
Respiration is a fundamental oxidation reaction necessary for life. Our cells use glucose and oxygen to produce energy through a series of chemical reactions. The formula:
\(C_6H_{12}O_6 + 6O_2 \rightarrow 6CO_2 + 6H_2O + energy\)
explains the biochemical process where glucose is 'burned' to release carbon dioxide, water, and energy in the form of ATP. This energy is then used by our bodies to carry out various functions, from muscle contraction to thought processes. Respiration is a marvelous example of how a chemical reaction can power an entire organism.
Photosynthesis
Photosynthesis is nature's way of converting solar energy into chemical energy. Plants, algae, and some bacteria use sunlight to transform carbon dioxide and water into glucose and oxygen, a reaction that can be represented by the equation:
\(6CO_2 + 6H_2O + energy \rightarrow C_6H_{12}O_6 + 6O_2\)
This process is not just vital for the survival of plants but also for all living organisms, including humans, as it produces the oxygen we breathe and forms the foundation of the food chain.
Combustion
Combustion reactions are exothermic, meaning they release heat. We observe these reactions when we light a candle, start a car engine, or cook with a gas stove. In a combustion reaction, a substance typically combines with oxygen to release energy. The reaction of propane in a grill, for example, can be represented by the equation:
\(C_3H_8 + 5O_2 \rightarrow 3CO_2 + 4H_2O + energy\)
This reaction shows how vital combustion is to everyday life, providing heat for cooking and warmth, and powering vehicles.
Neutralization
Neutralization reactions are crucial in maintaining the pH balance in various environments. When an acid reacts with a base, they form water and a salt. A common example is the reaction between hydrochloric acid and sodium hydroxide:
\(HCl + NaOH \rightarrow NaCl + H_2O\)
This type of reaction is used in various daily situations, ranging from treating a bee sting with baking soda to taking antacid tablets to relieve stomach acidity. Understanding neutralization can help us better manage our health and the environment.
Fermentation
Fermentation is a metabolic process that converts sugar to acids, gases, or alcohol in the absence of oxygen. Used in baking and brewing, yeast carries out fermentation to produce the bread and alcoholic beverages we enjoy. The equation for the alcoholic fermentation of glucose is:
\(C_6H_{12}O_6 \rightarrow 2C_2H_5OH + 2CO_2\)
Fermentation not only illustrates how microorganisms can change food chemistry but also highlights traditional methods of food preservation and preparation that we still value today.

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Most popular questions from this chapter

Theories should inspire questions. Discuss a scientific theory you know and the questions it brings up.

Discuss how a hypothesis can become a theory. Can a theory become a law? Explain.

As stated in the text, there is no one scientific method. However, making observations, formulating hypotheses, and performing experiments are generally components of "doing science." Read the following passage, and list any observations, hypotheses, and experiments. Support your answer. Joyce and Frank are eating raisins and drinking ginger ale. Frank accidentally drops a raisin into his ginger ale. They both notice that the raisin falls to the bottom of the glass. Soon, the raisin rises to the surface of the ginger ale, and then sinks. Within a couple of minutes, it rises and sinks again. Joyce asks, "I wonder why that happened?" Frank says, "I don't know, but let's see if it works in water." Joyce fills a glass with water and drops the raisin into the glass. After a few minutes, Frank says, "No, it doesn't go up and down in the water." Joyce closely observes the raisins in the two glasses and states, "Look, there are bubbles on the raisins in the ginger ale but not on the raisins in the water." Frank says, "It must be the bubbles that make the raisin rise." Joyce asks, "OK, but then why do they sink again?"

Scientific models do not describe reality. They are simplifications and therefore incorrect at some level. So why are models useful?

Describe three situations when you used the scientific method (outside of school) in the past month.
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