What Type of Change Can Break Down a Compound?
Elements
Learning Objectives
- Define chemical element.
- State basic properties of an element.
- Requite examples of elements and their uses.
Who is Sherlock Holmes?
Who is Sherlock Holmes?
The famous fictional British detective Sherlock Holmes was often said to make the statement "elementary, my love Watson." In reality, the closest he ever came to that line was an exchange with Watson in the short story "The Crooked Man." Holmes shows shrewd insight into Watson's activities of the day. When asked how he knew what Watson was doing, Holmes simply replies "Elementary." Regardless of exactly how he put information technology, Sherlock was simply referring to what the Free Dictionary defines every bit "relating to, or constituting the bones, essential, or fundamental part."
Elements
An element is the simplest form of affair that has a unique ready of properties. Examples of well-known elements include oxygen, iron, and gold (see the figure below). Elements cannot be broken downwardly into a simpler substance. Likewise, one chemical element cannot exist chemically converted into a different element.
Effigy two.fourteen
Chemic elements are the simplest of substances. (A) An oxygen tank like this is used past people with a demand for breathing help. (B) A simple skillet can be fabricated from cast atomic number 26. (C) Gold bars are formed and used for monetary purposes.
Some elements have been known for centuries (gold, silver, iron, copper, among others) while others have been created in the lab but within the final several years. Most elements do not exist as such in nature. They are so reactive that they tin be found just in combination with other materials.
Several of the elements are very valuable while others are quite inexpensive. Golden is currently worth almost $1700 per ounce. Aluminum, on the other hand, just sells for almost 90 cents per pound, considerably lower than gold. Copper is worth somewhat more, selling for approximately $iii.50 pound. Platinum is very valuable at about $1650 an ounce, non quite every bit expensive as gilt.
Savor an one-time song nigh the elements sung past Harvard lecturer Tom Lehrer. There were just 102 known elements at the time he wrote this song.
Summary
- An element is the simplest grade of thing that has a unique fix of properties.
- One element cannot be chemically converted to some other element.
Exercise
Questions
Select an element from this listing:
http://www.lenntech.com/periodic/name/alphabetic.htm
Answer the following questions:
- What is the name of the element?
- When was it discovered?
- Who discovered it?
- What is one utilize for this element?
Review
Questions
- What is an element?
- How much is gold worth today?
- How many elements did nosotros know about when Tom Lehrer wrote his song?
Glossary
- element: The simplest grade of matter that has a unique ready of properties.
Compounds
Learning Objectives
- Ascertain compound distinguish betwixt element and compound.
- Requite examples of compounds.
- Define chemic change.
What do you lot need to starting time building a house?
What do you need to start building a house?
When building a house, you lot showtime with a blueprint of what the firm will expect like. The plan states how many windows and what kind, how many doors and what style, how many rooms and what blazon (bedchamber, kitchen, other). The blueprint shows how the different pieces will go together to brand the house. Every bit long as the blueprint is followed and exactly the same items are used, the houses will exist identical.
Compounds
A compound is a substance that contains ii or more elements chemically combined in a stock-still proportion. The elements carbon and hydrogen combine to form many unlike compounds. One of the simplest is chosen methane, in which there are always iv times as many hydrogen particles as carbon particles. Methyl hydride is a pure substance because it ever has the same composition. However, it is not an element because it can exist broken down into simpler substances – carbon and hydrogen.
Retrieve that the components of a mixture tin can be separated from ane another by physical ways. This is not true for a chemical compound. Table table salt is a compound consisting of equal parts of the elements sodium and chlorine. Salt cannot be separated into its 2 elements past filtering, distillation, or any other concrete process. Salt and other compounds can only exist decomposed into their elements by a chemical procedure. A chemical modify is a change that produces matter with a different composition. Many compounds can exist decomposed into their elements by heating. When sugar is heated, it decomposes to carbon and water. Water is notwithstanding a compound, but ane which cannot exist broken downwards into hydrogen and oxygen past heating. Instead, the passage of an electrical electric current through water volition produce hydrogen and oxygen gases.
The properties of compounds are generally very different than the backdrop of the elements from which the compound is formed. Sodium is an extremely reactive soft metallic that cannot exist exposed to air or h2o. Chlorine is a deadly gas. The chemical compound sodium chloride is a white solid which is essential for all living things ( Figure beneath ).
Figure 2.15
(A) Sodium is then reactive that information technology must be stored under oil. (B) Chlorine is a poisonous yellow-green gas. (C) Common salt crystals, a compound of sodium and chlorine
Summary
- A compound is a substance that contains two or more elements chemically combined in a fixed proportion.
- A chemical change is a alter that produces thing with a different limerick.
Practice
Questions
Sentinel the video at the link below to answer the post-obit questions:
- What lists all the elements we know about?
- What is the compound made out of two hydrogen atoms and one oxygen atom?
- What is the compound made out of ane carbon atom and two oxygen atoms?
Review
Questions
- What is a compound?
- How is a compound different from an element?
- What is a chemical change?
Glossary
- chemical change: A change that produces matter with a unlike composition.
- compound: A substance that contains two or more elements chemically combined in a stock-still proportion.
Source: https://courses.lumenlearning.com/cheminter/chapter/elements-and-compounds/
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