Science 10 Chem - Holy Trinity Academy
... pure substances that contain a single kind of atom Each element differs from the others because it has distinct physical and chemical properties ...
... pure substances that contain a single kind of atom Each element differs from the others because it has distinct physical and chemical properties ...
CHEMICAL REACTIONS
... – Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken – Chemical reactions involve changes in matter, the making of new materials with new properties, and energy changes. – Symbols represent elements, formulas describe compounds, chemical equations describe ...
... – Chemical reactions occur when bonds between the outermost parts of atoms are formed or broken – Chemical reactions involve changes in matter, the making of new materials with new properties, and energy changes. – Symbols represent elements, formulas describe compounds, chemical equations describe ...
Practice Exam-Final Fall 2016 W-Ans
... 22. In the reaction of Al(OH)3 with H2SO4, how many moles of water can be produced If the reaction is begun with 5.500 mole of Al(OH)3? ...
... 22. In the reaction of Al(OH)3 with H2SO4, how many moles of water can be produced If the reaction is begun with 5.500 mole of Al(OH)3? ...
Review Chemistry KEY - cms16-17
... 30. What happens when substances react chemically to produce new substances? The substances will have a new identity and new and different chemical and physical properties will form. 31. Explain the difference between reactants and products. Include where in the equation they would be found. Reactan ...
... 30. What happens when substances react chemically to produce new substances? The substances will have a new identity and new and different chemical and physical properties will form. 31. Explain the difference between reactants and products. Include where in the equation they would be found. Reactan ...
Chemistry Nomenclature Notes
... Molecular Compounds When two or more nonmetals react to form a compound, the result is a molecule. These molecules DO NOT depend upon ionic charges. They are both negatively charged as ions so they would repel each other. These atoms combine by sharing valence (outside) electrons. This type of bond ...
... Molecular Compounds When two or more nonmetals react to form a compound, the result is a molecule. These molecules DO NOT depend upon ionic charges. They are both negatively charged as ions so they would repel each other. These atoms combine by sharing valence (outside) electrons. This type of bond ...
Reporting Category 3: Bonding and Chemical Reactions
... How can you apply metallic bonding theory to explain metallic properties? The nature of metallic bonding explains many physical properties of metals. For example, most metals are excellent conductors of thermal energy. When a difference in thermal energy is applied across a metal, it is quickly and ...
... How can you apply metallic bonding theory to explain metallic properties? The nature of metallic bonding explains many physical properties of metals. For example, most metals are excellent conductors of thermal energy. When a difference in thermal energy is applied across a metal, it is quickly and ...
AP CHEMISTRY – Source: 1999 AP Exam CHAPTER 8 TEST
... Identify the type(s) of intermolecular attractive forces in: (i) pure glucose Answer: Hydrogen bonding OR dipole-dipole interactions OR van de Waals interactions. (London dispersion forces may also be mentioned.) (ii) pure cyclohexane Answer: London dispersion forces (b) Glucose is soluble in water ...
... Identify the type(s) of intermolecular attractive forces in: (i) pure glucose Answer: Hydrogen bonding OR dipole-dipole interactions OR van de Waals interactions. (London dispersion forces may also be mentioned.) (ii) pure cyclohexane Answer: London dispersion forces (b) Glucose is soluble in water ...
Balancing Equations
... compound. Subscripts are determined by the valence electrons (charges for ionic or sharing for covalent) n Think ...
... compound. Subscripts are determined by the valence electrons (charges for ionic or sharing for covalent) n Think ...
Chemistry Final Review 2017 1. List a set of elements
... 19. How can you distinguish between formulas represent one ionic compound and one molecular compound? 20. Which element forms an ionic compound when it reacts with lithium? 21. The bonds in BaO are best described as __. 22. Which type of bond results when one or more valence electrons are transferre ...
... 19. How can you distinguish between formulas represent one ionic compound and one molecular compound? 20. Which element forms an ionic compound when it reacts with lithium? 21. The bonds in BaO are best described as __. 22. Which type of bond results when one or more valence electrons are transferre ...
CH 301 Practice Test Questions
... 5. Vapor obtained by evaporating 0.495 grams of an unknown liquid is collected in a 127 mL flask. At 371 K, the pressure of the vapor in the flask is 754 torr. What is the molar mass in g/mol? 6. What is the density of nitrogen gas at STP? 7. Consider two equal-sized containers, one filled with H2 g ...
... 5. Vapor obtained by evaporating 0.495 grams of an unknown liquid is collected in a 127 mL flask. At 371 K, the pressure of the vapor in the flask is 754 torr. What is the molar mass in g/mol? 6. What is the density of nitrogen gas at STP? 7. Consider two equal-sized containers, one filled with H2 g ...
chapter 7-Chemical Bonding
... Lewis Formulas for Molecules and Polyatomic Ions •First, we explore Lewis dot formulas of homonuclear diatomic molecules. –Two atoms of the same element. 1.Hydrogen molecule, H2. N=2x2=4 e- needed A=2x1=2 e- available S=N-A=2 e- shared ...
... Lewis Formulas for Molecules and Polyatomic Ions •First, we explore Lewis dot formulas of homonuclear diatomic molecules. –Two atoms of the same element. 1.Hydrogen molecule, H2. N=2x2=4 e- needed A=2x1=2 e- available S=N-A=2 e- shared ...
Core Idea PS1 Matter and Its Interactions How can one explain the
... periods (orders elements horizontally by the number of protons in the atom’s nucleus) families (place those with similar chemical properties in columns) valence (reflect patterns of outer electron states) ...
... periods (orders elements horizontally by the number of protons in the atom’s nucleus) families (place those with similar chemical properties in columns) valence (reflect patterns of outer electron states) ...
lewis dot diagrams (structures) for atoms and ions predicting
... 3. Matter tends to exist in its ______________________________ energy state. 4. A(n) __________________________ bond is a bond in which one atom donates electrons to another atom. 5. When the number of protons equals the number of electrons an atom has a _________________________ charge. 6. Ions are ...
... 3. Matter tends to exist in its ______________________________ energy state. 4. A(n) __________________________ bond is a bond in which one atom donates electrons to another atom. 5. When the number of protons equals the number of electrons an atom has a _________________________ charge. 6. Ions are ...
Worksheet 4 - Periodic Trends A number of physical and chemical
... When an electron is removed from an atom the repulsion between the remaining electrons decreases. The nuclear charge remains constant, so more energy is required to remove another electron from the positively charged ion. This means that, I1 < I2 < I3 < ..., for any given atom. Going down a group t ...
... When an electron is removed from an atom the repulsion between the remaining electrons decreases. The nuclear charge remains constant, so more energy is required to remove another electron from the positively charged ion. This means that, I1 < I2 < I3 < ..., for any given atom. Going down a group t ...
Physical Science Week 1
... Diagram of atom • Choose an element with atomic number between 19 and 36. • Create a diagram showing the correct number and placement (relative) of neutrons, protons, and electrons. Color and neatness count. • Create a legend (key) • Add the square from periodic table for your element. ...
... Diagram of atom • Choose an element with atomic number between 19 and 36. • Create a diagram showing the correct number and placement (relative) of neutrons, protons, and electrons. Color and neatness count. • Create a legend (key) • Add the square from periodic table for your element. ...
Atoms, Molecules and Ions
... For example, naturally occurring carbon, for example, is a mixture of two isotopes, 12C (98.89%) and 13C (1.11 %). Individual carbon atoms therefore have a mass of either 12.000 or 13.03354 amu. But the average mass of the different isotopes of carbon is 12.011 amu. ...
... For example, naturally occurring carbon, for example, is a mixture of two isotopes, 12C (98.89%) and 13C (1.11 %). Individual carbon atoms therefore have a mass of either 12.000 or 13.03354 amu. But the average mass of the different isotopes of carbon is 12.011 amu. ...
Chemistry I Exam
... A. They are negatively charged, their mass/charge ratio, and that they are part of all matter. B. They are negatively charged, their mass, and that they are part of all matter C. They are negatively charged, their mass/charge ratio. D. They are negatively charged. E. Thomson did not perform the “cat ...
... A. They are negatively charged, their mass/charge ratio, and that they are part of all matter. B. They are negatively charged, their mass, and that they are part of all matter C. They are negatively charged, their mass/charge ratio. D. They are negatively charged. E. Thomson did not perform the “cat ...
Total Notes for chem - Catawba County Schools
... electron by discrete amounts of energy called quanta . The principle quantum number is symbolized by n. The greatest number of electrons possible in any one energy level is described by the equation , # electrons = 2n2 Describing the size and shape of the electron cloud(the probable location of the ...
... electron by discrete amounts of energy called quanta . The principle quantum number is symbolized by n. The greatest number of electrons possible in any one energy level is described by the equation , # electrons = 2n2 Describing the size and shape of the electron cloud(the probable location of the ...
CHAPTER 9 CHEMICAL BONDING I
... the periodic table. These elements have only 2s and 2p subshells, which can hold a total of eight electrons. When an atom of one of these elements forms a covalent compound, it can attain the noble gas electron configuration [Ne] by sharing electrons with other atoms in the same compound. ...
... the periodic table. These elements have only 2s and 2p subshells, which can hold a total of eight electrons. When an atom of one of these elements forms a covalent compound, it can attain the noble gas electron configuration [Ne] by sharing electrons with other atoms in the same compound. ...
Test #1 Study Guide
... o Electrons are low mass, negatively charged particles present within all atoms. Robert Millikan – Through the Oil Drop experiment, deduced that the mass of an electron was about 200 times lighter than a hydrogen atom. Ernest Rutherford – Through his gold foil experiment in which he shot particles ...
... o Electrons are low mass, negatively charged particles present within all atoms. Robert Millikan – Through the Oil Drop experiment, deduced that the mass of an electron was about 200 times lighter than a hydrogen atom. Ernest Rutherford – Through his gold foil experiment in which he shot particles ...
Answers to 2017 Chemistry Exam Review Compounds and
... 75. Temperature relates to the kinetic energy or speed of molecules. Pressure relates to how often and how hard the molecules hit each other or other things. 76. Atmospheric pressure depends on the weight of air above = about 15 psi = 1 atm at sea level. It decreases altitude increases b/c of less w ...
... 75. Temperature relates to the kinetic energy or speed of molecules. Pressure relates to how often and how hard the molecules hit each other or other things. 76. Atmospheric pressure depends on the weight of air above = about 15 psi = 1 atm at sea level. It decreases altitude increases b/c of less w ...
Exam practice answers
... that the temperature rise was approximately 50C, if the thermometer used measured to the nearest degree, then the percentage error in measuring the temperature rise would be of the order (1/50) 100 = 2%. Given the inaccuracy of the experiment this is not a significant error. (c) There are many ex ...
... that the temperature rise was approximately 50C, if the thermometer used measured to the nearest degree, then the percentage error in measuring the temperature rise would be of the order (1/50) 100 = 2%. Given the inaccuracy of the experiment this is not a significant error. (c) There are many ex ...
AHSGE Review
... The most valance electrons an atom can have is 8. This is called the octet rule. The number 8 is possible by gaining, losing or sharing electrons. The octet rule explains why atoms tend to form compounds. ...
... The most valance electrons an atom can have is 8. This is called the octet rule. The number 8 is possible by gaining, losing or sharing electrons. The octet rule explains why atoms tend to form compounds. ...
Chemistry I – Fall 2004
... (B) NH4Cl (C) CCl4 (D) CO2 14. Covalent bonds are most likely to be found in the compound represented by the formula (A) NaCl (B) KBr (C) CH4 (D) HI E) CaF2 15. A pure substance melts at 113 °C and does not conduct electricity in either the solid or liquid state. What conclusions can be drawn concer ...
... (B) NH4Cl (C) CCl4 (D) CO2 14. Covalent bonds are most likely to be found in the compound represented by the formula (A) NaCl (B) KBr (C) CH4 (D) HI E) CaF2 15. A pure substance melts at 113 °C and does not conduct electricity in either the solid or liquid state. What conclusions can be drawn concer ...
Resonance (chemistry)
In chemistry, resonance or mesomerism is a way of describing delocalized electrons within certain molecules or polyatomic ions where the bonding cannot be expressed by one single Lewis formula. A molecule or ion with such delocalized electrons is represented by several contributing structures (also called resonance structures or canonical forms).Each contributing structure can be represented by a Lewis structure, with only an integer number of covalent bonds between each pair of atoms within the structure. Several Lewis structures are used collectively to describe the actual molecular structure, which is an approximate intermediate between the canonical forms called a resonance hybrid. Contributing structures differ only in the position of electrons, not in the position of nuclei.Electron delocalization lowers the potential energy of the substance and thus makes it more stable than any of the contributing structures. The difference between the potential energy of the actual structure and that of the contributing structure with the lowest potential energy is called the resonance energy or delocalization energy.Resonance is distinguished from tautomerism and conformational isomerism, which involve the formation of isomers, thus the rearrangement of the nuclear positions.