Unit 7 - Elements and Compounds | TEST #2
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This document provides an overview of elements, compounds, and chemical formulas. It discusses how elements are arranged on the periodic table and classified as metals and non-metals. Metals are described as shiny, good conductors or heat/electricity, and malleable, while non-metals are dull, poor conductors, and brittle. Compounds are formed when different types of atoms bond together into molecules. Chemical formulas represent the elements that make up compounds and use prefixes to indicate the number of each atom. Common compounds like water, sodium chloride, and calcium carbonate are presented along with their formulas.
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SCIENCE7: Elements and Compounds
This document provides information about elements and compounds. It begins by defining pure substances as either elements or compounds. Elements contain only one type of atom, while compounds contain two or more different types of atoms bonded together. Examples of common elements and their symbols are provided, along with their locations on the periodic table. Elements are also classified as metals, nonmetals, and metalloids. Examples of important compounds like water and their chemical formulas are also given. Students are then asked to classify substances as elements or compounds and answer multiple choice questions to assess their understanding of the key concepts.
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Here are the key points about homogeneous and heterogeneous mixtures:
- Homogeneous mixtures have uniform composition and appearance throughout. Common examples include solutions.
- Heterogeneous mixtures have visibly distinct parts that can be seen without using a microscope. The substances do not dissolve or blend uniformly.
- Homogeneous mixtures are examples of single phase systems while heterogeneous mixtures contain two or more phases (solid, liquid, gas).
- Sugar solution is an example of a homogeneous mixture where sugar is dissolved uniformly throughout the water. Water and oil is an example of a heterogeneous mixture since the substances do not dissolve in each other and remain as separate visible layers.
The key difference is that homogeneous mixtures appear uniform while heterogeneous mixtures have distinct parts
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- Elements are pure substances that cannot be broken down further without losing their identity, and there are currently 118 known elements, with 88 occurring naturally.
- In the universe, hydrogen makes up 75% and helium 20%, while on Earth oxygen is the most abundant element in the crust at 46.6% and silicon is second most at 27.7%.
- Compounds are pure substances made of two or more chemically bonded elements, with properties different from the individual elements, and can be represented by chemical formulas showing the elements and their ratios.
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This document discusses the differences between substances, mixtures, and compounds. It defines a substance as matter made of the same atoms, and notes that elements and compounds are types of substances. A mixture is two or more substances physically blended but not chemically bonded. Granite and air are given as examples of heterogeneous and homogeneous mixtures respectively. The document explains that mixtures can be separated into their original substances using physical means, while compounds require chemical changes to separate them into their component elements.
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Elements are substances that cannot be broken down further and are made of only one type of atom. There are currently 118 known elements, many of which are represented by chemical symbols. Compounds are formed when two or more elements are chemically bonded together and have properties different from their constituent elements. The periodic table arranges the elements in order of atomic number and provides information about each element. Hydrogen and oxygen are the most abundant elements in the universe and on Earth, while carbon and other elements make up living things and common substances.
Development of the periodic table
Alchemists in the Middle Ages first introduced symbols for elements, which influenced modern chemists' use of symbols for convenience. Jons Jacob Berzelius invented the current system of chemical symbols. Elements' symbols are derived from their names in Latin, English, or the scientists who discovered them. Henry Moseley's work with X-ray spectra showed that atomic number, not mass, determines an element's position in the periodic table. This led to restating the periodic law in terms of atomic number and the modern form of the periodic table.
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Here are the key points about homogeneous and heterogeneous mixtures:
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- Elements are pure substances that cannot be broken down further without losing their identity, and there are currently 118 known elements, with 88 occurring naturally.
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This document discusses the differences between substances, mixtures, and compounds. It defines a substance as matter made of the same atoms, and notes that elements and compounds are types of substances. A mixture is two or more substances physically blended but not chemically bonded. Granite and air are given as examples of heterogeneous and homogeneous mixtures respectively. The document explains that mixtures can be separated into their original substances using physical means, while compounds require chemical changes to separate them into their component elements.
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This document provides an overview of atoms, elements, molecules, and compounds. It discusses how everything is made up of atoms, which contain subatomic particles like protons, neutrons, and electrons. Atoms of the same element have the same number of protons. Elements are organized in the periodic table according to their properties and atomic structure. Atoms can bond together to form molecules, which are made of one or more elements. Compounds are molecules made of two or more different elements bonded together. The properties of compounds are different from the individual elements.
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The Atoms Family was created by Kathleen Crawford in 1994. It features characters like Patty Proton and Nelda Neutron who hang out at the Nucleus Arcade in Matterville. Other characters include Enraged Elliott Electron who rides a motorcycle very fast around the arcade. The morale of Matterville depends on balancing the number of positive protons and negative electrons.
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Preparing table of specification for Grade 7 and Grade 8
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Similar to Unit 7 - Elements and Compounds | TEST #2
Elements and compounds
This document provides an overview of elements, compounds, and how they relate. It defines elements as pure substances made of single atom types, while compounds are formed when two or more different elements bond together. Elements are represented by symbols on the periodic table and have distinct properties based on their atomic structure. Compounds have new properties and are represented by formulas showing the elements present and their ratios. The document explains how ionic and covalent bonds form compounds from elements and provides examples of common elements, compounds, and how to determine compound formulas from their constituent ions.
Metals &; non metals
The document discusses the physical and chemical properties of metals and non-metals. Physically, metals are typically solid, shiny, malleable, and good conductors of heat and electricity, while non-metals exist in different physical states, have a dull appearance, and are brittle and poor conductors. Chemically, metals react with oxygen to form metal oxides, react with water to produce hydroxides and hydrogen gas, and react with acids to form salts and hydrogen gas. Non-metals show varying reactivity. Metals and non-metals have many important uses - metals such as iron, copper, and aluminum are used in construction and electronics, while non-metals such as carbon,
3 130821054737-phpapp01
Mendeleev arranged the elements in order of increasing atomic mass in a periodic table. He noticed that elements with similar properties fell into recurring patterns, allowing him to predict properties of undiscovered elements. Later, Moseley arranged elements by atomic number, better reflecting their properties. The periodic table organizes elements into metals, nonmetals, and metalloids, which have characteristic physical and chemical properties depending on their group and period.
Chemistry assignment basic questions
BookMyEssay provides the best chemistry assignment help. Students can avail best assignment writing help from the experts of BME. Contact on https://www.bookmyessay.com/chemistry-assignment/
Periodic table elements
The document provides information about the periodic table, including its organization into periods and families. It describes the properties and composition of different types of elements such as metals, non-metals, and metalloids. Key figures who developed the periodic table, like Dmitri Mendeleev, are mentioned. Different areas of the periodic table are also summarized, including the alkali metals, transition metals, and noble gases. Basic chemistry concepts such as elements, compounds, and mixtures are defined.
Elements, compound and mixture
This document discusses the classification and properties of matter. It defines the four states of matter as solid, liquid, gas, and plasma. Matter is classified as either elements, compounds, or mixtures based on its chemical constitution. Elements are pure substances that cannot be broken down further, while compounds contain two or more elements chemically bonded together. Compounds have distinct properties from their constituent elements. The document provides examples of elements and compounds, and discusses their distinguishing physical and chemical properties. Redox reactions are described as reactions where both oxidation and reduction occur simultaneously.
OXIDE in chemistry
Inorganic compounds are compounds found in non-living things and consist mostly of mineral constituents of the earth. They can be classified based on the elements they contain, such as metals or non-metals, or the group they belong to like sulfates or nitrates. Important classes of inorganic compounds discussed include oxides, which contain oxygen and another element and can be acidic, basic, amphoteric, neutral or peroxides depending on their chemical properties.
The Periodic Table
This document provides an overview of the periodic table of elements and key information about each group. It discusses the physical and chemical properties of elements in groups 1-18, including alkali metals, alkaline earth metals, transition metals, and noble gases. Diagrams showing atomic structure (Bohr models and Lewis dot structures) are provided for many elements, along with examples of common compounds and reactions. The periodic trends of atomic radius, ionization energy, and reactivity across periods and down groups are also covered.
Atomic Number.pptSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS...
Here are some common elements we use every day:
- Carbon - found in pencil lead, food, and our bodies
- Oxygen - we breathe it
- Hydrogen - found in water
- Nitrogen - makes up most of the air we breathe
- Calcium - found in bones and milk
- Sodium - found in salt
- Chlorine - used to purify water
- Aluminum - used in cans and foil
- Copper - used in wiring and plumbing
- Iron - found in many foods and our blood
- Zinc - supports immune function and found in ointments
- Iodine - essential for thyroid function and added to salt
Solidification and microstructure of metals/certified fixed orthodontic cours...
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Learning_The_Periodic_Table.ppt
Here are some common elements we use every day:
- Carbon - found in pencils, food, plastics
- Oxygen - we breathe it
- Hydrogen - found in water
- Nitrogen - in the air we breathe
- Calcium - in our bones and teeth
- Sodium - in salt
- Chlorine - in drinking water and swimming pools
- Aluminum - used in cans and foil
- Copper - in wiring and plumbing
- Iron - in foods and construction materials
- Zinc - in galvanization and supplements
- Iodine - added to salt for thyroid health
Learning_The_Periodic_Table.pptggggggggggggggggg
Here are some common elements we use every day:
- Carbon - found in pencils, food, plastics
- Oxygen - we breathe it
- Hydrogen - found in water
- Nitrogen - in the air we breathe
- Calcium - in our bones and teeth
- Sodium - in salt
- Chlorine - in drinking water and swimming pools
- Aluminum - used in cans and foil
- Copper - in wiring and plumbing
- Iron - in foods and construction materials
- Zinc - in galvanization and supplements
- Iodine - added to salt for thyroid health
Learning_The_Periodic_Table.ppt
Here are some common elements we use every day:
- Carbon - found in pencils, food, plastics
- Oxygen - we breathe it
- Hydrogen - found in water
- Nitrogen - in the air we breathe
- Calcium - in our bones and teeth
- Sodium - in salt
- Chlorine - in drinking water and swimming pools
- Aluminum - used in cans and foil
- Copper - in wiring and plumbing
- Iron - in foods and construction materials
- Zinc - in galvanization and supplements
- Iodine - added to salt for thyroid health
Solidification and microstructure of metals/dental lab technology courses by ...
Solidification and microstructure of metals/dental lab technology courses by ...Indian dental academy
This document provides an overview of solidification and microstructure of metals. It discusses the classification, properties, and bonding of metals. It describes the microscopic structure of metals including space lattices, grain formation during solidification, and lattice imperfections. It also covers heat treatment processes like annealing and how they impact the microstructure and properties of metals. The key topics covered in the document relate to the solidification, crystal structure, defects and heat treatment of metals.Alloys used in dentistry/cosmetic dentistry course by Indian dental academy
This document provides an overview of metals and alloys used in dentistry. It discusses the classification, properties, and microscopic structure of metals. It describes different types of lattice structures and imperfections that can occur. It also covers heat treatment processes like annealing and hardening that are used to modify the properties of dental alloys. The document serves as a reference for the various alloys and their applications in dentistry, including their composition, properties and casting techniques.
elements, compounds and mixtures
1. The document discusses elements, compounds, mixtures and molecules. It defines an element as a substance made of only one type of atom, and a compound as two or more different types of atoms chemically bonded together.
2. A molecule is two or more atoms of the same or different elements chemically bonded together, while a mixture is two or more substances mingled but not chemically combined. Water is given as an example of a compound made of hydrogen and oxygen molecules.
3. The document also compares properties of common compounds like H2O, CO2, MgO and FeS to their constituent elements, and how mixtures can sometimes be separated but compounds cannot since they have undergone a chemical change.
Periodic table
The document provides information about the periodic table of elements, including:
1) It describes some of the key elements like gold, silver, helium, oxygen, and hydrogen.
2) It explains that the periodic table organizes the 118 known elements according to properties like atomic number and mass.
3) The periodic table can be used to predict an element's physical and chemical properties based on its position in the table.
periodic_table.ppt
This document provides information about the periodic table of elements. It defines key terms like atomic number, atomic mass, symbols, and properties of different types of elements such as metals and non-metals. It explains the organization of the periodic table and characteristics of different families of elements such as alkali metals, transition metals, and noble gases. It also discusses how elements can combine to form compounds and mixtures.
001 periodic table
The document provides information about the periodic table of elements. It defines key terms like elements, compounds, mixtures and discusses the organization and properties of different groups of elements on the periodic table. The periodic table organizes 118 known elements according to their atomic structure and properties. Elements are grouped into blocks like alkali metals, halogens, noble gases etc. based on their valence electrons and reactivity. The positions of elements in the periodic table can reveal information about their chemical and physical properties.
Similar to Unit 7 - Elements and Compounds | TEST #2 (20)
Atomic Number.pptSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS...
Atomic Number.pptSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSSS...
Solidification and microstructure of metals/certified fixed orthodontic cours...
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Solidification and microstructure of metals/dental lab technology courses by ...
Solidification and microstructure of metals/dental lab technology courses by ...
Alloys used in dentistry/cosmetic dentistry course by Indian dental academy
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Unit 7 - Elements and Compounds | TEST #2
- 1. Elements and Compounds Chemistry - 7th Grade | The Oxford School,Azuero Prepared by Teacher Irina Ruiz Monday, July 11, 2016
- 2. • The elements are arranged in order of increasing atomic number • The horizontal rows are called periods • The vertical columns are called groups • Elements in the same group are similar to each other Hydrogen is a non-metal but it is often put in the middle. Notice that most elements are metals, rather than non-metals. Each element has its own chemical symbol, made from letters. Remember that you will only find elements in the periodic table and never compounds. 1 2 3 4 5 6 7 Monday, July 11, 2016
- 3. METALS Iron, magnesium and gold are examples of metal elements. Metals have properties in common. They are: • shiny, especially when they are freshly cut • good conductors of heat and electricity • malleable (they can be bent and shaped without breaking) Most metals also have other properties in common. They are: • solid at room temperature, except mercury • hard and strong • they have a high density • they are sonorous Monday, July 11, 2016
- 4. NON-METALS Oxygen, carbon, sulfur and chlorine are examples of non-metal elements. Non-metals have properties in common. They are: • dull (not shiny) • poor conductors of heat and electricity (they are insulators) • weak and brittle (they easily break or shatter when solid) Most non-metals also have these properties: • they have a low density (they feel light for their size) • They are NOT sonorous (they do not make a ringing sound when hit) Monday, July 11, 2016
- 5. Compounds and Formulae! Some atoms like to hangout with other atoms. And others prefer to keep to themselves... WATER MOLECULE FORMULA H2O When a group of atoms hang out together, it is called a MOLECULE ! WATER is a COMPOUND because their molecules are made of different kinds of atoms: 1 oxygen atom bonded with 2 hydrogen atoms Monday, July 11, 2016
- 6. BASIC RULES ON NAMING COMPOUNDS • If the compound contains a metal, the name of the metal comes first. • If the compound contains a non-metal, the name of the non-metal is usually changed: ➡ When two elements form a compound the name often ends in ‘ide’ ➡ When the third element is oxygen, the compound often have names ending with ’ate’ sodium chloride A compound of Calcium, Carbon and Oxygen is called: calcium carbonate Monday, July 11, 2016
- 7. PREFIXES in Compounds How many of each kind of atoms are bonded together? • ‘Mon’ or ‘mono’ means ONE • ‘Di’ means TWO • ‘Tri’ means THREE carbon dioxide MOLECULE carbon monoxide MOLECULE Monday, July 11, 2016
- 8. When hydroxides are dissolved in water, they form solutions that can neutralise acids. • NaOH sodium hydroxide • KOH potassium hydroxide • LiOH lithium hydroxide Hydroxides are alkalis! ACIDS ALKALIS Monday, July 11, 2016
- 9. FORMULA NAME OF THE COMPOUND WHAT IS THIS COMPOUND MADE FROM? H2O water two atoms of hydrogen bonded with one atom of oxygen NaBr sodium bromide SO2 sulfur dioxide CaCO3 calcium carbonate MgSO4 KOH LiNO3 H2S Monday, July 11, 2016