Atoms Elements Molecules And Compounds Worksheet Pdf

atoms elements molecules and compounds worksheet pdf

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Everything is made from atoms , including you. Atoms are tiny particles that are far too small to see, even with a microscope. If people were the same size as atoms, the entire population of the world would fit into a box about a thousandth of a millimetre across.

Since the carbon- 12 isotope is more abundant, its mass is weighted more in the calculation of carbon's atomic mass. The element is: Carbon b. What atomic number would an isotope of U 92 have?

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Elements, mixtures and compounds teaching resources

The law of Conservation of Mass ii. The law of Definite Propotions iii. Law of Definite Proportions All samples of a given compound, regardless of their source or how they were prepared, have the same proportions of their constituent elements Joseph Proust Proportions in Sodium Chloride A Law of Multiple Proportions When two elements call them A and B form two different compounds, the masses of B that combine with 1 g of A can be expressed as a ratio of small, whole numbers John Dalton Oxides of Carbon Carbon combines with oxygen to form two different compounds, carbon monoxide and carbon dioxide Carbon monoxide contains 1.

Daltons Atomic Theory 1. Each element is composed of tiny, indestructible particles called atoms 2. All atoms of a given element have the same mass and other properties that distinguish them from atoms of other elements 3. Atoms combine in simple, whole-number ratios to form molecules of compounds 4. In a chemical reaction, atoms of one element cannot change into atoms of another element Practice Decide if each statement is correct according to Daltons model of the atom 1.

Copper atoms can combine with zinc atoms to make gold atoms 2. Water is composed of many identical molecules that have one oxygen atom and two hydrogen atoms 3. Some carbon atoms weigh more than other carbon atoms 4. Because the mass ratio of Fe:O in wsite is 1. Copper atoms can combine with zinc atoms to make gold atoms incorrect; according to Dalton, atoms of one element cannot turn into atoms of another element by a chemical reaction.

He knew this because if atoms could change it would change the total mass and violate the Law of Conservation of Mass. Water is composed of many identical molecules that have one oxygen atom and two hydrogen atoms correct; according to Dalton, atoms combine together in compounds in small wholenumber ratios, so that you could describe a compound by describing the number of atoms of each element in a molecule.

He used this idea to explain why compounds obey the Law of Definite Proportion. Some carbon atoms weigh more than other carbon atoms incorrect; according to Dalton, all atoms of an element are identical.

If you could combine fractions of atoms, that would mean the atom is breakable and Daltons first premise would be incorrect.

Rutherfords Interpretation the Nuclear Model 1. The atom contains a tiny dense center called the nucleus 2. The nucleus has essentially the entire mass of the atom 3. The nucleus is positively charged 4.

Charged Atoms When atoms gain or lose electrons, they acquire a charge Charged atoms or groups of atoms are called ions When atoms gain electrons, they become negatively charged ions, called anions When atoms lose electrons, they become positively charged ions, called cations Ions and Compounds Ions behave much differently than the neutral atoms e. The Modern Periodic Table Elements with similar chemical and physical properties are in the same column Columns are called Groups or Families designated by a number and letter at top Rows are called Periods Each period shows the pattern of properties repeated in the next period.

Practice What is the charge on each of the following ions? Mass Spectrum A mass spectrum is a graph that gives the relative mass and relative abundance of each particle Relative mass of the particle is plotted in the x-axis Relative abundance of the particle is plotted in the y-axis. Practice Ga with mass Calculate the atomic mass of gallium. Chemical Bonds Chemical bonds are forces of attraction between atoms The bonding attraction comes from attractions between protons and electrons Bond Types Two general types: ionic and covalent Ionic bonds result when electrons have been transferred between atoms, resulting in oppositely charged ions that attract each other generally found when metal atoms bond to nonmetal atoms Covalent bonds result when two atoms share some of their electrons generally found when nonmetal atoms bond together Chemical Formula To represent the compounds.

Types of Formula:Empirical Formula An empirical formula gives the relative number of atoms of each element in a compound The empirical formula for the ionic compound fluorspar is CaCl2. Types of Formula:Molecular Formula A molecular formula gives the actual number of atoms of each element in a molecule of a compound The molecular formula is C2H2O4.

This does not tell you that the carbon atoms are attached together in the center of the molecule, and that each is attached to two oxygen atoms. Cobalt, Co Ionic Compounds Compounds of metals with nonmetals are made of ions Have a 3-dimensional array of cations and anions made of formula units Many contain polyatomic ions several atoms attached together by covalent bonds into one ion.

Practice What are the formulas for compounds made from the following ions? Potassium ion with a nitride ion Calcium ion with a bromide ion Aluminum ion with a sulfide ion Naming Metal Cations Metals with variable Charges metals whose ions can have more than one possible charge.

Naming Metal Cations Metals with invariant charge metals whose ions can only have one possible charge. Naming Monatomic Nonmetal Anion To name anion, change ending on the element name to ide 1. Practice Find the charge on the cation 1.

Example: Naming binary ionic with variable charge metal CuF2 1. Write the cation name first, then the anion name copper II fluoride Name the following compounds 1. Example: Naming binary molecular BF3 1. Name the first element 2. Identify the anion 2. Name the anion with an ic suffix 3. Add a hydro- prefix to the anion name 4.

Add the word acid to the end. Example: Naming oxyacids H2SO4 aq 1. If the anion has ate suffix, change it to ic. If the anion has ite suffix, change it to -ous 3. Write the name of the anion followed by the word acid. Example: Naming oxyacids H2SO3 aq 1. Name the Following H2S HClO3 HNO2 Writing Formulas for Acids When name ends in acid, formulas starts with H Write formulas as if ionic, even though it is molecular Hydro prefix means it is binary acid, no prefix means it is an oxyacid For oxyacid, if ending is ic, polyatomic ion ends in ate; if ending is ous, polyatomic ion ends in ous.

Example: Oxyacids - sulfurous acid 1. Write the symbol for the cation and its charge 2. Write the symbol for the anion and its charge 3. Charge without sign becomes subscript for other ion 4. Add aq to indicate dissolved in water 5. Check that the total charge of the cations cancels the total charge of the anions Practice What are the formulas for the following acids? Open navigation menu. Close suggestions Search Search.

User Settings. Skip carousel. Carousel Previous. Carousel Next. What is Scribd? Atom,elements, molecules and compounds. Uploaded by Samsuddin Musa. Document Information click to expand document information Description: For matriculation or foundation student. Date uploaded May 14, Did you find this document useful? Is this content inappropriate? Report this Document. Description: For matriculation or foundation student.

Flag for inappropriate content. Download now. Save Save Atom,elements, molecules and compounds. Related titles. Carousel Previous Carousel Next. Jump to Page. Search inside document. Chemical Bonds Chemical bonds are forces of attraction between atoms The bonding attraction comes from attractions between protons and electrons Bond Types Two general types: ionic and covalent Ionic bonds result when electrons have been transferred between atoms, resulting in oppositely charged ions that attract each other generally found when metal atoms bond to nonmetal atoms Covalent bonds result when two atoms share some of their electrons generally found when nonmetal atoms bond together Chemical Formula To represent the compounds Types of Formula:Empirical Formula An empirical formula gives the relative number of atoms of each element in a compound The empirical formula for the ionic compound fluorspar is CaCl2.

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Atoms and Molecules Worksheets

Looking for short lessons to keep your child engaged and learning? Our experienced team of teachers have created English, maths and science lessons for the home, so your child can learn no matter where they are. And, as all activities are self-marked, you really can encourage your child to be an independent learner. You may have heard of atoms before, but what've they got to do with elements and compounds? Firstly, atoms are the basic building blocks of all matter on Earth and they're very tiny far too small to be seen with the naked eye. Substances can be categorised as either elements or compounds. Both of these are made up of atoms, the only difference is an element is made of one type of atom whereas compounds are made of two or more different types of atoms.

The basic building block of all matter, atoms are at the core of all that we see, touch, smell, feel, and taste. Molecules are formed when two or more atoms link up. A reasonable knowledge of atoms and molecules is indispensable for us to demystify the universe. Both substantially informative and excitingly illustratory, our atoms and molecules worksheets for grade 5 through grade 8 take students through all relevant aspects of the topic with such delicate attention for detail that by the end of the worksheets, learners leave thoroughly educated. Start off with our free worksheets and come back for more!

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Atoms, elements, molecules, compounds and mixtures. Student worksheet: CDROM index 01SW. Discussion of answers: CDROM index 01DA. Topics. Atoms.


Atoms and Molecules Worksheets

Failure to grasp the differences between these superficially similar types of substance will hamper student progress. An element e. A compounds e.

The Periodic Table Packet 1 Answer Key - Learny Kids The periodic table of elements is a concise, information-dense catalog of all of the different sorts of atoms in the universe, and. Periodic Table Activity: Complete the table on page 21 with the information found on pages When complete color each group in a different color in the periodic table. Each element on the periodic table has a mass number, and the mass number of each element equals one mole. In addition, the conversion factor that relates atoms and moles is always 6.

Atom,elements, molecules and compounds.pdf

Atoms and Molecules Worksheets

The law of Conservation of Mass ii. The law of Definite Propotions iii. Law of Definite Proportions All samples of a given compound, regardless of their source or how they were prepared, have the same proportions of their constituent elements Joseph Proust Proportions in Sodium Chloride A Law of Multiple Proportions When two elements call them A and B form two different compounds, the masses of B that combine with 1 g of A can be expressed as a ratio of small, whole numbers John Dalton

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Matter can be divided into pure substances and mixtures. Pure substances have fixed physical and chemical properties , such as melting and boiling point, and chemical reactivity. Gold is a pure substance — it has fixed physical and chemical properties. Chlorine, sulfur and copper are elements — they have fixed physical and chemical properties, and cannot be broken down into simpler substances. Images: W. Copper sulfate is a compound — it has fixed physical and chemical properties, but can be broken down into simpler substances the elements copper, sulfur and oxygen.

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The atoms in all substances that contain multiple atoms are held together by electrostatic interactions—interactions between electrically charged particles such as protons and electrons. Electrostatic attraction between oppositely charged species positive and negative results in a force that causes them to move toward each other, like the attraction between opposite poles of two magnets. In contrast, electrostatic repulsion between two species with the same charge either both positive or both negative results in a force that causes them to repel each other, as do the same poles of two magnets. Atoms form chemical compounds when the attractive electrostatic interactions between them are stronger than the repulsive interactions.

Atoms, elements and compounds

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