Elements and Compounds 2
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The document discusses elements, compounds, molecules, and chemical bonds. It provides examples of ionic bonds (sodium chloride) and covalent bonds (water). It defines a molecule as two or more atoms connected together, and a compound as two or more different atoms connected together. The document also discusses the chemical formulas of compounds like alcohol and glucose, showing the atoms present and their quantities.
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Elements and compounds
A substance is composed of only one type of atom or molecule. Elements are substances made of the same kind of atom and cannot be broken down further. Examples of elements include gold, silver, and mercury in their solid and liquid states, as well as helium in its gaseous state. Chemical symbols represent elements using letters, often the first one or two letters of their names. Compounds are made of two or more elements combined in a definite ratio, such as water (H2O) which contains hydrogen and oxygen. Molecules form when two or more atoms of elements or compounds combine. Molecular formulas use symbols to represent the elements and numbers of atoms in a molecule, such as CO2 for carbon dioxide.
atoms and elements
This document provides an overview of key chemistry concepts including atoms, elements, compounds, symbols, the periodic table, molecules, formulae, and chemical reactions. It explains that everything is made of tiny particles called atoms, which combine to form either elements or compounds. Compounds contain two or more elements joined together. The periodic table organizes all known elements based on their properties. Molecules are formed when atoms of elements combine, and chemical formulae represent the atoms that make up compounds and molecules. Chemical reactions involve atoms rearranging to form new substances.
Discuss element compound
This document differentiates between elements and compounds. An element is made of only one type of atom and cannot be broken down further, while a compound is made of two or more elements. The periodic table arranges elements and provides information about their properties. Common elements include metals like copper, iron, magnesium, and calcium, as well as nonmetals like chlorine, carbon, and fluorine. Compounds are named according to set rules based on the elements they contain and whether oxygen is present. Examples are given of both elements and compounds.
C04 elements and compounds
- The document discusses elements and compounds. It defines an element as a substance that cannot be broken down further by chemical means, while a compound is made up of two or more elements chemically bonded together.
- Formulas are used to represent the composition of compounds, showing the symbols and ratios of elements present. Writing balanced chemical equations requires determining the correct ratios of reactants and products to satisfy the law of conservation of mass.
Unit 1: Matter
1. Matter is everything that has mass and volume and exists in three states: solid, liquid, and gas. The document defines the key properties of each state.
2. Atoms are the smallest particles that make up all matter. Atoms can join together to form molecules or exist as individual elements. Elements are made of a single type of atom, while compounds contain two or more different types of atoms.
3. Pure substances like elements and compounds are uniform throughout, while mixtures contain two or more substances that can be separated. Examples of mixtures include solutions, alloys, and suspensions.
ATOMS AND MOLECULE PART -1
The document discusses the history of ideas about atoms and molecules from ancient Indian and Greek philosophers to modern atomic theory. Some key points:
1) Ancient philosophers proposed ideas of matter being divisible into increasingly smaller particles, but lacked evidence.
2) In the late 18th century, Lavoisier established laws of conservation of mass and definite proportions through experiments.
3) In the early 19th century, Dalton combined previous ideas with evidence to propose atomic theory - that all matter is made of tiny indivisible particles called atoms that combine in whole number ratios.
4) Atoms are represented by symbols, have specific masses, and combine to form molecules - the smallest units of compounds that exhibit chemical properties
Atomsandmolecules 100919202417-phpapp02
- The document discusses atoms, ions, molecules, elements, compounds, and chemical formulas and reactions.
- Atoms combine to form molecules, and molecules made of the same type of atom are elements, while molecules with different atom types are compounds.
- Chemical formulas use symbols and subscripts to represent the elements and number of each type of atom in a molecule or compound.
- Chemical reactions can release or absorb energy and are classified as exothermic or endothermic respectively.
Atoms and Molecules
- The document discusses atoms, ions, molecules, elements, compounds, and chemical formulas and reactions.
- Atoms combine to form molecules, and molecules made of the same type of atom are elements, while molecules with different atom types are compounds.
- Chemical formulas use symbols and subscripts to represent the elements and number of each type of atom in a molecule or compound.
- Chemical reactions can release or absorb energy and are classified as exothermic or endothermic respectively.
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Elements and compounds
A substance is composed of only one type of atom or molecule. Elements are substances made of the same kind of atom and cannot be broken down further. Examples of elements include gold, silver, and mercury in their solid and liquid states, as well as helium in its gaseous state. Chemical symbols represent elements using letters, often the first one or two letters of their names. Compounds are made of two or more elements combined in a definite ratio, such as water (H2O) which contains hydrogen and oxygen. Molecules form when two or more atoms of elements or compounds combine. Molecular formulas use symbols to represent the elements and numbers of atoms in a molecule, such as CO2 for carbon dioxide.
atoms and elements
This document provides an overview of key chemistry concepts including atoms, elements, compounds, symbols, the periodic table, molecules, formulae, and chemical reactions. It explains that everything is made of tiny particles called atoms, which combine to form either elements or compounds. Compounds contain two or more elements joined together. The periodic table organizes all known elements based on their properties. Molecules are formed when atoms of elements combine, and chemical formulae represent the atoms that make up compounds and molecules. Chemical reactions involve atoms rearranging to form new substances.
Discuss element compound
This document differentiates between elements and compounds. An element is made of only one type of atom and cannot be broken down further, while a compound is made of two or more elements. The periodic table arranges elements and provides information about their properties. Common elements include metals like copper, iron, magnesium, and calcium, as well as nonmetals like chlorine, carbon, and fluorine. Compounds are named according to set rules based on the elements they contain and whether oxygen is present. Examples are given of both elements and compounds.
C04 elements and compounds
- The document discusses elements and compounds. It defines an element as a substance that cannot be broken down further by chemical means, while a compound is made up of two or more elements chemically bonded together.
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Unit 1: Matter
1. Matter is everything that has mass and volume and exists in three states: solid, liquid, and gas. The document defines the key properties of each state.
2. Atoms are the smallest particles that make up all matter. Atoms can join together to form molecules or exist as individual elements. Elements are made of a single type of atom, while compounds contain two or more different types of atoms.
3. Pure substances like elements and compounds are uniform throughout, while mixtures contain two or more substances that can be separated. Examples of mixtures include solutions, alloys, and suspensions.
ATOMS AND MOLECULE PART -1
The document discusses the history of ideas about atoms and molecules from ancient Indian and Greek philosophers to modern atomic theory. Some key points:
1) Ancient philosophers proposed ideas of matter being divisible into increasingly smaller particles, but lacked evidence.
2) In the late 18th century, Lavoisier established laws of conservation of mass and definite proportions through experiments.
3) In the early 19th century, Dalton combined previous ideas with evidence to propose atomic theory - that all matter is made of tiny indivisible particles called atoms that combine in whole number ratios.
4) Atoms are represented by symbols, have specific masses, and combine to form molecules - the smallest units of compounds that exhibit chemical properties
Atomsandmolecules 100919202417-phpapp02
- The document discusses atoms, ions, molecules, elements, compounds, and chemical formulas and reactions.
- Atoms combine to form molecules, and molecules made of the same type of atom are elements, while molecules with different atom types are compounds.
- Chemical formulas use symbols and subscripts to represent the elements and number of each type of atom in a molecule or compound.
- Chemical reactions can release or absorb energy and are classified as exothermic or endothermic respectively.
Atoms and Molecules
- The document discusses atoms, ions, molecules, elements, compounds, and chemical formulas and reactions.
- Atoms combine to form molecules, and molecules made of the same type of atom are elements, while molecules with different atom types are compounds.
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- Chemical reactions can release or absorb energy and are classified as exothermic or endothermic respectively.
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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.
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.
Elements and Compounds
- 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.
Atoms, elements, and compounds notes
Atoms are the basic building blocks of matter and are made up of protons, neutrons, and electrons. Elements are pure substances made of only one type of atom, such as sodium (Na) or oxygen (O). Compounds are formed when two or more elements chemically combine, resulting in a substance with totally new properties compared to the original elements. The periodic table provides information about each element's atomic number, chemical symbol, and atomic mass.
Molecular Compounds
Molecular compounds are formed when atoms of two or more different non-metals combine through covalent bonds. Covalent bonds involve the sharing of electron pairs between atoms. Molecular compounds have properties such as being soft, having low melting points, and not conducting electricity. The naming of molecular compounds involves naming the elements present and indicating the number of atoms through prefixes.
elements compond and molecules
There are three main types of matter: elements, compounds, and mixtures. Elements are pure substances made of only one type of atom, while compounds are made of two or more elements chemically bonded together. Compounds are represented by chemical formulas that use symbols to show what elements are present and in what ratios. Mixtures are combinations of elements or compounds that are not chemically bonded and whose components retain their individual properties. Common examples are water (H2O), salt (NaCl), carbon dioxide (CO2), and air.
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Elements and compounds
Elements are substances made of only one type of atom, while compounds are made of two or more elements that are chemically bonded together. The chemical formula of a compound shows which elements it contains. Compounds have different properties than their constituent elements. Common table salt, or NaCl, is a compound formed from the elements sodium and chlorine bonding together, even though on their own sodium is a metal and chlorine is a gas. Compounds form when atoms bond by sharing, gaining or losing electrons.
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The document provides information on elements and compounds. It defines an element as a substance that cannot be broken down further by chemical means, while a compound is made up of two or more elements chemically combined. It discusses how elements are the fundamental building blocks, and how compounds have fixed compositions represented by chemical formulas. The document also covers writing and balancing chemical equations, including the use of state symbols.
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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.
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.
Elements and Compounds
- 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.
Atoms, elements, and compounds notes
Atoms are the basic building blocks of matter and are made up of protons, neutrons, and electrons. Elements are pure substances made of only one type of atom, such as sodium (Na) or oxygen (O). Compounds are formed when two or more elements chemically combine, resulting in a substance with totally new properties compared to the original elements. The periodic table provides information about each element's atomic number, chemical symbol, and atomic mass.
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Molecular compounds are formed when atoms of two or more different non-metals combine through covalent bonds. Covalent bonds involve the sharing of electron pairs between atoms. Molecular compounds have properties such as being soft, having low melting points, and not conducting electricity. The naming of molecular compounds involves naming the elements present and indicating the number of atoms through prefixes.
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There are three main types of matter: elements, compounds, and mixtures. Elements are pure substances made of only one type of atom, while compounds are made of two or more elements chemically bonded together. Compounds are represented by chemical formulas that use symbols to show what elements are present and in what ratios. Mixtures are combinations of elements or compounds that are not chemically bonded and whose components retain their individual properties. Common examples are water (H2O), salt (NaCl), carbon dioxide (CO2), and air.
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Elements are substances made of only one type of atom, while compounds are made of two or more elements that are chemically bonded together. The chemical formula of a compound shows which elements it contains. Compounds have different properties than their constituent elements. Common table salt, or NaCl, is a compound formed from the elements sodium and chlorine bonding together, even though on their own sodium is a metal and chlorine is a gas. Compounds form when atoms bond by sharing, gaining or losing electrons.
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The document provides information about elements and compounds for 7th grade science. It begins by outlining the objectives of describing elements and compounds, explaining the difference between them, and citing examples. It then defines matter and discusses the three states of matter. It explains that elements are pure substances that cannot be broken down further, while compounds are formed by combining two or more elements. The document provides numerous examples of elements and compounds. It also discusses the periodic table and properties of metals, nonmetals and metalloids.
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- Atoms are the smallest unit of matter and contain protons, neutrons, and electrons. Electrons occupy different energy levels around the nucleus.
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- Chemical reactions involve the formation or breaking of chemical bonds to rearrange matter without creating or destroying it.
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The document provides an overview of basic chemistry concepts including:
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- Atoms are the smallest unit of matter and contain protons, neutrons, and electrons. Electrons orbit the nucleus of the atom which contains protons and neutrons. The periodic table shows the structure of atoms.
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- Atoms are the smallest unit of matter and contain protons, neutrons, and electrons. Electrons orbit the nucleus of the atom. The periodic table shows the structure of atoms based on atomic number and mass number.
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This document discusses the basic chemistry concepts of matter, elements, compounds, and atoms. It defines key terms like chemical symbol, formula, and equation. Atoms are made up of protons, neutrons, and electrons. The periodic table organizes elements and provides atomic number, mass number, and information about chemical properties. Elements in the same group on the periodic table have similar chemical properties. Electrons determine an element's chemical reactivity, with most elements seeking to obtain a full outer electron shell of 8 electrons.
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Elements and Compounds 2
- 1. Review the Atom Label the Parts in notebook: 3. 1. 2. 4.
- 2. Review the Atom Label the Parts in notebook: 3. Neutron 1. Nucleus 2. Electron 4. Proton
- 3. Elements and Compounds 2 Foundation Science 4 Class Code SC22102
- 4. Molecules A molecule is 2 or more atoms connected to each other
- 5. Compounds A compound is 2 or more DIFFERENT atoms connected to each other
- 6. Practice Answer molecules, compounds, or both in your foundation notebook. 1. 2. 3. 4. 5. 6. 7. 8.
- 7. Answer Questions in Notebook 1. 2. 3. 4. 5. A ________ is 2 or more atoms connected to each other. A ________is 2 or more DIFFERENT atoms connected to each other _________ is anything that has mass and takes up space. An ________ is the basic unit of matter. When something is made up of only one type of atom, it is called an ___________. 6. The ________ __________ is the number of protons in an atom. 7. Water (H2O) is a ______ (compound, molecule or both) 8. Nitrogen (N2) is a _______ (compound , molecule or both)
- 8. Answers 1. 2. 3. 4. 5. A molecule is 2 or more atoms connected to each other. A compound is 2 or more DIFFERENT atoms connected to each other Matter is anything that has mass and takes up space. An atom is the basic unit of matter. When something is made up of only one type of atom, it is called an element. 6. The atomic number is the number of protons in an atom. 7. Water (H2O) is a both (compound, molecule, both) 8. Nitrogen (N2) is a molecule (compound, molecule, both)
- 9. Elements in the Human Body The human body is made up mostly of Oxygen (65%), Carbon (18%) and Hydrogen (10%). We are about 70% water (= H and O) The body also has: 3.2% Nitrogen 1.5% Calcium 1.0% Phosphorus
- 10. Elements in the Earth’s Crust Earth’s crust is the outer layer… Crust is: 50% Oxygen (O) 26% Silicon (Si) 7% Aluminum (Al) 4% Iron (Fe)
- 11. Atoms Like to Give or Share Electrons This bonds them together This creates a NEW substance called a molecule, with new properties Sodium (Na) metal is very dangerous and explodes in water Chlorine (Cl) is a very dangerous gas
- 12. Sodium (Na)
- 13. Atoms Like to Give or Share Electrons This bonds them together This creates a NEW substance called a molecule, with new properties Sodium (Na) metal is very dangerous and explodes in water + Chlorine (Cl) is a very dangerous gas But together, table salt (NaCl) is completely safe
- 14. Types of Chemical Bonds Covalent Bond – atoms share outer electrons Ionic Bond – electron moves from one atom to another
- 15. Examples of Ionic and Covalent Bonds Water (H2O) is a covalent bond Sodium chloride (NaCl) is an ionic bond
- 16. Classification of Elements Elements are classified into 3 states: Solid Silver Liquid Solid Gas Bromine Liquid Chlorine Gas
- 17. Chemical Formulas The chemical formula shows what atoms and how many are present in the compound. Example… H2O Atomic symbols How many hydrogen atoms present If there is no number it means there is 1 atom
- 18. Chemical Formulas Practice with using chemical formulas: Alcohol C2H5OH What atoms are present in this compound? Carbon (C), Hydrogen (H) and Oxygen (O) How many of each atom is present? 2 carbon atoms 6 Hydrogen atoms 1 oxygen atom
- 19. 1. 2. 3. 4. 5. 6. 7. 8. Answer In Your Notebook What is the most common element in the human body (by mass)? What is the most common element in the earth’s crust (by mass)? Is sodium metal (Na) a safe material? Is chlorine gas (Cl) safe to breathe? Is sodium chloride (NaCl) safe? A ________ bond shares its electrons. In a _________ bond electron(s) go from one atom to another. How many atoms of each element are present in the compounds: Refined sugar, C12H22O11 Sulphuric acid, H2SO4 Glucose, C6H12O6 Urea, CO (NH2)2 9. Which compound from above is this? 10. What is the chemical formula for butane?