Honors Chemistry I
... hydrogen gas. Balanced the following equations for these two processes: a. Fe3O4(s) + H2(g) Fe(s) + H2O(g) b. Fe3O4(s) + CO(g) Fe(s) + CO2(g) 3) Chromium compounds exhibit a wide variety of bright colors. When solid ammonium dichromate—a vivid orange compound—is ignited, a spectacular reaction o ...
... hydrogen gas. Balanced the following equations for these two processes: a. Fe3O4(s) + H2(g) Fe(s) + H2O(g) b. Fe3O4(s) + CO(g) Fe(s) + CO2(g) 3) Chromium compounds exhibit a wide variety of bright colors. When solid ammonium dichromate—a vivid orange compound—is ignited, a spectacular reaction o ...
Stench Chemicals Fact Sheet
... environment. Precautions must also be taken to prevent these vapors from being exhausted out of the building via fume hoods or house vacuums. In addition to affecting the outside environment, these noxious odors can be re-introduced into other buildings via air intakes and distributed to locations t ...
... environment. Precautions must also be taken to prevent these vapors from being exhausted out of the building via fume hoods or house vacuums. In addition to affecting the outside environment, these noxious odors can be re-introduced into other buildings via air intakes and distributed to locations t ...
08_Lecture - HCC Learning Web
... atoms of each element must be the same on both sides of the arrow. • This is called a balanced chemical equation. • We balance chemical reactions by placing a whole number coefficient in front of each substance. • A coefficient multiplies all subscripts in a chemical formula: – 3 H2O has 6 hydrogen ...
... atoms of each element must be the same on both sides of the arrow. • This is called a balanced chemical equation. • We balance chemical reactions by placing a whole number coefficient in front of each substance. • A coefficient multiplies all subscripts in a chemical formula: – 3 H2O has 6 hydrogen ...
Exam Review_Key_All Topics.082
... 7. a) How does increasing the volume of a gas effect its pressure, assuming that temperature remains the same. Pressure and volume are inversely proportional, therefore if you increase the volume of a gas you will decrease the pressure. ...
... 7. a) How does increasing the volume of a gas effect its pressure, assuming that temperature remains the same. Pressure and volume are inversely proportional, therefore if you increase the volume of a gas you will decrease the pressure. ...
chem A exercise package C
... electron into this overlapping region or into an electron "pool." By doing this, each atom appears to gain an electron within its original boundary. For every overlapping region an atom appears to gain one electron. Two overlapping regions, such as for oxygen, will result in the gain of two electron ...
... electron into this overlapping region or into an electron "pool." By doing this, each atom appears to gain an electron within its original boundary. For every overlapping region an atom appears to gain one electron. Two overlapping regions, such as for oxygen, will result in the gain of two electron ...
Advanced Placement Chemistry
... 74. A solution of calcium hypochlorite, a common additive to swimming-pool water, is (A) basic because of the hydrolysis of the OCl¯ ion (B) basic because Ca(OH)2 is a weak and insoluble base (C) neutral if the concentration is kept below 0.1 molar (D) acidic because of the hydrolysis of the Ca2+ i ...
... 74. A solution of calcium hypochlorite, a common additive to swimming-pool water, is (A) basic because of the hydrolysis of the OCl¯ ion (B) basic because Ca(OH)2 is a weak and insoluble base (C) neutral if the concentration is kept below 0.1 molar (D) acidic because of the hydrolysis of the Ca2+ i ...
MC94 - Southchemistry.com
... (D) Between 4 and 7 (E) 4 67. Substances X and Y that were in a solution were separated in the laboratory using the technique of fractional crystallization. This fractional crystallization is possible because substances X and Y have different (A) boiling points (B) melting points (C) densities (D) ...
... (D) Between 4 and 7 (E) 4 67. Substances X and Y that were in a solution were separated in the laboratory using the technique of fractional crystallization. This fractional crystallization is possible because substances X and Y have different (A) boiling points (B) melting points (C) densities (D) ...
Unit - 7.pmd
... to increase in size and metallic character. In fact last member of the group, bismuth hardly forms any compound in –3 oxidation state. The stability of +5 oxidation state decreases down the group. The only well characterised Bi (V) compound is BiF5. The stability of +5 oxidation state decreases and ...
... to increase in size and metallic character. In fact last member of the group, bismuth hardly forms any compound in –3 oxidation state. The stability of +5 oxidation state decreases down the group. The only well characterised Bi (V) compound is BiF5. The stability of +5 oxidation state decreases and ...
Unit 1: Sig. Figs, Compounds, Elements, Homo/Hetero mixtures
... 3. Carbon dioxide, water (H2O), and nitrous oxide are best characterized as a. atoms b. elements c. mixtures d. all chemicals e. molecules 4. Sand, air, and powdered iced tea are best characterized as a. atoms b. elements c. mixtures d. solutions e. molecules 5. The main difference between compounds ...
... 3. Carbon dioxide, water (H2O), and nitrous oxide are best characterized as a. atoms b. elements c. mixtures d. all chemicals e. molecules 4. Sand, air, and powdered iced tea are best characterized as a. atoms b. elements c. mixtures d. solutions e. molecules 5. The main difference between compounds ...
Name - TeacherWeb
... The elements in Group 18 are known as the noble gases. They do not usually form compounds because they do not like to gain, lose, or share electrons. All of the noble gases exist in the Earth’s atmosphere, but only in small amounts. ...
... The elements in Group 18 are known as the noble gases. They do not usually form compounds because they do not like to gain, lose, or share electrons. All of the noble gases exist in the Earth’s atmosphere, but only in small amounts. ...
CHM 151LL: States of Matter: Physical and Chemical Changes
... Substances can exist in three physical states: solid, liquid, and gas. Some of the differences between these states of matter are 1) the atoms’ or molecules’ freedom of movement and 2) the amount of space between the atoms or molecules. The physical state of a substance at a specific temperature dep ...
... Substances can exist in three physical states: solid, liquid, and gas. Some of the differences between these states of matter are 1) the atoms’ or molecules’ freedom of movement and 2) the amount of space between the atoms or molecules. The physical state of a substance at a specific temperature dep ...
The p-Block Elements The p-Block Elements
... to increase in size and metallic character. In fact last member of the group, bismuth hardly forms any compound in –3 oxidation state. The stability of +5 oxidation state decreases down the group. The only well characterised Bi (V) compound is BiF5. The stability of +5 oxidation state decreases and ...
... to increase in size and metallic character. In fact last member of the group, bismuth hardly forms any compound in –3 oxidation state. The stability of +5 oxidation state decreases down the group. The only well characterised Bi (V) compound is BiF5. The stability of +5 oxidation state decreases and ...
1 chemistry of the nonmetals
... pain, and general body pain. At concentrations above 1 ppm, ozone is toxic. The most famous characteristic of ozone is its ability to absorb high energy radiation in the ultraviolet portion of the spectrum ( 300 nm), thereby providing a filter that protects us from exposure to high energy ultravi ...
... pain, and general body pain. At concentrations above 1 ppm, ozone is toxic. The most famous characteristic of ozone is its ability to absorb high energy radiation in the ultraviolet portion of the spectrum ( 300 nm), thereby providing a filter that protects us from exposure to high energy ultravi ...
C3 Revision Question Booklet
... To gain full marks in this question you should write your ideas in good English. Put them into a sensible order and use the correct scientific words. ...
... To gain full marks in this question you should write your ideas in good English. Put them into a sensible order and use the correct scientific words. ...
CHM 151LL: States of Matter: Physical and Chemical Changes
... Substances can exist in three physical states: solid, liquid, and gas. Some of the differences between these states of matter are 1) the atoms’ or molecules’ freedom of movement and 2) the amount of space between the atoms or molecules. The physical state of a substance at a specific temperature dep ...
... Substances can exist in three physical states: solid, liquid, and gas. Some of the differences between these states of matter are 1) the atoms’ or molecules’ freedom of movement and 2) the amount of space between the atoms or molecules. The physical state of a substance at a specific temperature dep ...
CHEM110P1_06_2015_Y_P1
... Antimony (atomic symbol Sb) consists of two naturally occurring isotopes; 121Sb with mass 120.904 u and an abundance of 57.21% and 123Sb with mass of 122.904 u and an abundance of 42.79%. Using this data, calculate the weighted average atomic mass of antimony. a) ...
... Antimony (atomic symbol Sb) consists of two naturally occurring isotopes; 121Sb with mass 120.904 u and an abundance of 57.21% and 123Sb with mass of 122.904 u and an abundance of 42.79%. Using this data, calculate the weighted average atomic mass of antimony. a) ...
Preparation and Properties of Hydrogen
... hydrogen will float. Because of the hydrogen molecule's small size, it will diffuse through many substances. Hydrogen gas is extremely flammable and will react with oxygen to form water with a release of a great deal of heat. The Hindenburg Zeppelin was destroyed in 1937 because of this reaction. He ...
... hydrogen will float. Because of the hydrogen molecule's small size, it will diffuse through many substances. Hydrogen gas is extremely flammable and will react with oxygen to form water with a release of a great deal of heat. The Hindenburg Zeppelin was destroyed in 1937 because of this reaction. He ...
Gas Stoichiometry
... Example of a Gas Stoichiometry Problem Airbags in automobiles contain sodium azide (NaN3), potassium nitrate, and silicon dioxide. (All are solids.) 1. Upon impact, the bag is inflated by the thermal decomposition of sodium azide (NaN3) to sodium metal and nitrogen gas. 2. Because sodium is toxic a ...
... Example of a Gas Stoichiometry Problem Airbags in automobiles contain sodium azide (NaN3), potassium nitrate, and silicon dioxide. (All are solids.) 1. Upon impact, the bag is inflated by the thermal decomposition of sodium azide (NaN3) to sodium metal and nitrogen gas. 2. Because sodium is toxic a ...
Chapter 1 Matter and Change
... 1) Solid- matter that can not flow (definite shape) and has definite volume. 2) Liquid- definite volume but takes the shape of its container (flows). 3) Gas- a substance without definite volume or shape and can flow. – Vapor- a substance that is currently a gas, but normally is a liquid or solid at ...
... 1) Solid- matter that can not flow (definite shape) and has definite volume. 2) Liquid- definite volume but takes the shape of its container (flows). 3) Gas- a substance without definite volume or shape and can flow. – Vapor- a substance that is currently a gas, but normally is a liquid or solid at ...
Describing Chemical Reactions
... The principle called conservation of mass was first demonstrated in the late 1700s. The principle of conservation of mass states that in a chemical reaction, the total mass of the reactants must equal the total mass of the products. In an open system, matter can enter from or escape to the surroundi ...
... The principle called conservation of mass was first demonstrated in the late 1700s. The principle of conservation of mass states that in a chemical reaction, the total mass of the reactants must equal the total mass of the products. In an open system, matter can enter from or escape to the surroundi ...
Gases - Chemistry 504
... Thus, the gas is hydrogen. Factors Affecting Effusion and Diffusion 1) Temperature: At a lower temperature the kinetic energy of a gas is lower, so it moves slower (diffusion is slower). 2) Size of the Particles: As size increases velocity of a gas decreases. 3) Medium: Diffusion and effusion is aff ...
... Thus, the gas is hydrogen. Factors Affecting Effusion and Diffusion 1) Temperature: At a lower temperature the kinetic energy of a gas is lower, so it moves slower (diffusion is slower). 2) Size of the Particles: As size increases velocity of a gas decreases. 3) Medium: Diffusion and effusion is aff ...
Honors Chemistry Unit 4 Student Packet: Honors Chemistry Problem
... 8. Chemists sometimes obtain calcium by reacting calcium oxide with aluminum. If the sample of calcium oxide is 85.0% pure, what mass of calcium would be produced form 500.g of the calcium oxide sample? 9. An ore containing 80.0 % zinc sulfide is heated with oxygen gas to produce zinc oxide and sulf ...
... 8. Chemists sometimes obtain calcium by reacting calcium oxide with aluminum. If the sample of calcium oxide is 85.0% pure, what mass of calcium would be produced form 500.g of the calcium oxide sample? 9. An ore containing 80.0 % zinc sulfide is heated with oxygen gas to produce zinc oxide and sulf ...
Topic 4 Chemistry of the Elements of the Main Group
... electricity. Metals make crystal lattice structures in which electrons can flow freely. Metalloids or semi-metals show intermediate conduction properties (they are semiconductors). Their electronegativity values are close to 2. The valence electrons of metalloids are localised around the nucleus but ...
... electricity. Metals make crystal lattice structures in which electrons can flow freely. Metalloids or semi-metals show intermediate conduction properties (they are semiconductors). Their electronegativity values are close to 2. The valence electrons of metalloids are localised around the nucleus but ...
The representative Elements: Groups 1A – 4A
... paper, plastics, etc.; 2. the source for calcium metal and quicklime: Calcination: CaCO3(s) CaO(s) + CO2(g) ...
... paper, plastics, etc.; 2. the source for calcium metal and quicklime: Calcination: CaCO3(s) CaO(s) + CO2(g) ...
CHEMISTRY SEC 06 SYLLABUS
... heating / cooling curve. It is suggested that examples are chosen from substances mentioned in Section 5.4(b). (e.g. sodium chloride, sodium carbonate and oxides). In addition see also section 5.1(c) for the action of heat on copper, carbon and sulfur. ...
... heating / cooling curve. It is suggested that examples are chosen from substances mentioned in Section 5.4(b). (e.g. sodium chloride, sodium carbonate and oxides). In addition see also section 5.1(c) for the action of heat on copper, carbon and sulfur. ...
Fluorochemical industry
The global market for chemicals from fluorine was about US$16 billion per year as of 2006. The industry was predicted to reach 2.6 million metric tons per year by 2015. The largest market is the United States. Western Europe is the second largest. Asia Pacific is the fastest growing region of production. China in particular has experienced significant growth as a fluorochemical market and is becoming a producer of them as well. Fluorite mining (the main source of fluorine) was estimated in 2003 to be a $550 million industry, extracting 4.5 million tons per year.Mined fluorite is separated into two main grades, with about equal production of each. Acidspar is at least 97% CaF2; metspar is much lower purity, 60–85%. (A small amount of the intermediate, ceramic, grade is also made.) Metspar is used almost exclusively for iron smelting. Acidspar is primarily converted to hydrofluoric acid (by reaction with sulfuric acid). The resultant HF is mostly used to produce organofluorides and synthetic cryolite.