the nakuru district sec. schools trial examinations - 2015
... (i) One reason why these materials have been used in the past. (1 mark) Lead piping had unique ability to resist pin hole leaks lead does not rust/corrode forms a protective layer on its surface 6. State and explain what is observed when chlorine gas is bubbled through a solution of potassium br ...
... (i) One reason why these materials have been used in the past. (1 mark) Lead piping had unique ability to resist pin hole leaks lead does not rust/corrode forms a protective layer on its surface 6. State and explain what is observed when chlorine gas is bubbled through a solution of potassium br ...
Complete the following equations
... Name three major elements in the atmosphere and describe briefly their extraction process from the atmosphere. There is more oxygen (by mass) in the ocean than in the atmosphere. Why oxygen is commercially obtained from the atmosphere and not from the ocean? ...
... Name three major elements in the atmosphere and describe briefly their extraction process from the atmosphere. There is more oxygen (by mass) in the ocean than in the atmosphere. Why oxygen is commercially obtained from the atmosphere and not from the ocean? ...
chemistry-2nd-edition-julia-burdge-solution
... When writing formulas of ionic compounds, the subscript of the cation is numerically equal to the charge of the anion, and the subscript of the anion is numerically equal to the charge on the cation. If the charges of the cation and anion are numerically equal, then no subscripts are necessary. Char ...
... When writing formulas of ionic compounds, the subscript of the cation is numerically equal to the charge of the anion, and the subscript of the anion is numerically equal to the charge on the cation. If the charges of the cation and anion are numerically equal, then no subscripts are necessary. Char ...
50 Forgotten Facts
... 39) In Le Chatelier’s Principle, if a system is at equilibrium, if something is added, then the equilibrium will shift away from the side it is on. If something is removed, then the equilibrium will shift towards that side. After the shift, whatever is being shifted towards will increase in concentr ...
... 39) In Le Chatelier’s Principle, if a system is at equilibrium, if something is added, then the equilibrium will shift away from the side it is on. If something is removed, then the equilibrium will shift towards that side. After the shift, whatever is being shifted towards will increase in concentr ...
AP CHEMISTRY SUMMER 2016
... Welcome to AP Chemistry! I am eagerly anticipating a great year of Chemistry. In order to ensure the best start for everyone next fall, I have prepared a summer assignment that reviews basic chemistry concepts. There is a multitude of tremendous chemistry resources are available via the Internet. Wi ...
... Welcome to AP Chemistry! I am eagerly anticipating a great year of Chemistry. In order to ensure the best start for everyone next fall, I have prepared a summer assignment that reviews basic chemistry concepts. There is a multitude of tremendous chemistry resources are available via the Internet. Wi ...
Chapter 2
... • Matter is made up of elements • An element is a substance that cannot be broken down to other substances by chemical reactions • A compound is a substance consisting of two or more elements in a fixed ratio • A compound has characteristics different from those of its elements ...
... • Matter is made up of elements • An element is a substance that cannot be broken down to other substances by chemical reactions • A compound is a substance consisting of two or more elements in a fixed ratio • A compound has characteristics different from those of its elements ...
Structure and Properties of Matter
... composition. No doubt there are also matter which do not have uniform composition. Such matter are called mixtures. Some examples of mixtures are air, soft drink, milk, and cement. Mixtures are either homogeneous or heterogeneous. Suppose you add 5g of sugar to water kept in a glass tumbler. After s ...
... composition. No doubt there are also matter which do not have uniform composition. Such matter are called mixtures. Some examples of mixtures are air, soft drink, milk, and cement. Mixtures are either homogeneous or heterogeneous. Suppose you add 5g of sugar to water kept in a glass tumbler. After s ...
FREQUENTLY FORGOTTEN FACTS
... 38) At equilibrium, the RATES are equal. The amounts don’t have to be. a) For the change H2O (l) + heat H2O (g) at 100oC, what must be true about the rate of boiling and the rate of condensing? 39) In Le Chatelier’s Principle, if a system is at equilibrium, if something is added, then the equilibr ...
... 38) At equilibrium, the RATES are equal. The amounts don’t have to be. a) For the change H2O (l) + heat H2O (g) at 100oC, what must be true about the rate of boiling and the rate of condensing? 39) In Le Chatelier’s Principle, if a system is at equilibrium, if something is added, then the equilibr ...
08 PowerPoint
... must show all reactants and products formulas must be correct Law of Conservation of Mass must be satisfied (equation must be balanced) ...
... must show all reactants and products formulas must be correct Law of Conservation of Mass must be satisfied (equation must be balanced) ...
Student Exploration Sheet: Growing Plants
... 2. Solve: Turn off Show summary. Use the Choose reaction drop down menu to see other equations, and balance them. Check your answers and then write the balanced equations and draw the molecules in each image. _____ Al ...
... 2. Solve: Turn off Show summary. Use the Choose reaction drop down menu to see other equations, and balance them. Check your answers and then write the balanced equations and draw the molecules in each image. _____ Al ...
Unit 8 Powerpoint
... 4. Balance the elements one at a time by using coefficients. Begin by balancing elements that appear only once on each side of the equation. Unwritten coefficients are assumed to be 1 Once you are certain you have the correct chemical ...
... 4. Balance the elements one at a time by using coefficients. Begin by balancing elements that appear only once on each side of the equation. Unwritten coefficients are assumed to be 1 Once you are certain you have the correct chemical ...
Electron - HCC Learning Web
... pure form and in combinations called compounds • Organisms are composed of matter • Matter is anything that takes up space and has mass • Matter is made up of elements ...
... pure form and in combinations called compounds • Organisms are composed of matter • Matter is anything that takes up space and has mass • Matter is made up of elements ...
50 Frequently Forgotten Facts
... 38) At equilibrium, the RATES are equal. The amounts don’t have to be. a) For the change H2O (l) + heat H2O (g) at 100oC, what must be true about the rate of boiling and the rate of condensing? 39) In Le Chatelier’s Principle, if a system is at equilibrium, if something is added, then the equilibr ...
... 38) At equilibrium, the RATES are equal. The amounts don’t have to be. a) For the change H2O (l) + heat H2O (g) at 100oC, what must be true about the rate of boiling and the rate of condensing? 39) In Le Chatelier’s Principle, if a system is at equilibrium, if something is added, then the equilibr ...
Lesson 13: Nuclear Propulsion Basics
... • Because neutrons are electrically neutral, they are unaffected by Coloumbic or nuclear forces until they reach within 10-15 m of an atomic nucleus – Best particles to use for FISSION ...
... • Because neutrons are electrically neutral, they are unaffected by Coloumbic or nuclear forces until they reach within 10-15 m of an atomic nucleus – Best particles to use for FISSION ...
85 Q.1 A substance X melts at 1600oC. Its does
... 35 Br and 35 Br . The relative atomic mass of bromine is 79.9. Which of the following statements is/are correct? (1) The relative abundance of each isotopic form is about the same. (2) The two isotopes have different numbers of protons. (3) The two isotopes have different numbers of neutrons. ...
... 35 Br and 35 Br . The relative atomic mass of bromine is 79.9. Which of the following statements is/are correct? (1) The relative abundance of each isotopic form is about the same. (2) The two isotopes have different numbers of protons. (3) The two isotopes have different numbers of neutrons. ...
Chapter 2 - San Joaquin Memorial High School
... applications of chemical phenomena that were utilized prior to 1000 B.C. The Greeks were the first to try to explain why chemical changes occur. By about 400 B.C. they had proposed that all matter was composed of four fundamental substances: fire, earth, water, and air. The Greeks also considered th ...
... applications of chemical phenomena that were utilized prior to 1000 B.C. The Greeks were the first to try to explain why chemical changes occur. By about 400 B.C. they had proposed that all matter was composed of four fundamental substances: fire, earth, water, and air. The Greeks also considered th ...
Complete the following equations
... (Nitrogen, oxygen and argon. Gases are extracted by fractional distillation of liquefied air. Extracting oxygen from seawater involves distillation of the water (to remove salts) and electrolysis. These processes are energy intensive) ...
... (Nitrogen, oxygen and argon. Gases are extracted by fractional distillation of liquefied air. Extracting oxygen from seawater involves distillation of the water (to remove salts) and electrolysis. These processes are energy intensive) ...
Atomic Masses: Counting Atoms by Weighing
... containing large numbers of them. In the last section we saw that we can easily count things like jelly beans and mints by weighing. Exactly the same principles can be applied to counting atoms. Because atoms are so tiny, the normal units of mass—the gram and the kilogram—are much too large to be co ...
... containing large numbers of them. In the last section we saw that we can easily count things like jelly beans and mints by weighing. Exactly the same principles can be applied to counting atoms. Because atoms are so tiny, the normal units of mass—the gram and the kilogram—are much too large to be co ...
C4C5C6
... They all have similar properties because they have the same number of electrons in the outer shell. ...
... They all have similar properties because they have the same number of electrons in the outer shell. ...
Ionic bonding - Nidderdale High School
... 1. What scale is used to measure how acidic or alkaline a substance is? 2. What in the name and formula of the acid that can be used to make magnesium chloride from magnesium ribbon? 3. What is the definition of an acid? 4. What is the difference between an alkali and a base? 5. What gas is formed w ...
... 1. What scale is used to measure how acidic or alkaline a substance is? 2. What in the name and formula of the acid that can be used to make magnesium chloride from magnesium ribbon? 3. What is the definition of an acid? 4. What is the difference between an alkali and a base? 5. What gas is formed w ...
Chemistry 116: General Chemistry
... The reaction is faster at higher temperatures. The reaction has only one type of reactant. The rate remains constant when the reactant concentration is doubled. The reaction slows down as time goes on. The half life remains constant as time goes on. ...
... The reaction is faster at higher temperatures. The reaction has only one type of reactant. The rate remains constant when the reactant concentration is doubled. The reaction slows down as time goes on. The half life remains constant as time goes on. ...
Click here for the Reaction NOTES Handout
... Precipitate: A solid that forms when solutions of soluble chemicals are mixed and react. Can be seen as cloudy, “snow”, or a powder at the bottom of the container. Any ionic compound that is insoluble will exist as a solid mass either as little pieces floating or as a mass of sloid at the bottom on ...
... Precipitate: A solid that forms when solutions of soluble chemicals are mixed and react. Can be seen as cloudy, “snow”, or a powder at the bottom of the container. Any ionic compound that is insoluble will exist as a solid mass either as little pieces floating or as a mass of sloid at the bottom on ...
chem100c1f
... Properties of Substances • Physical properties: • Physical properties are descriptions of matter such as color, density, viscosity, boiling point, and melting point. • Chemical properties: • Chemical properties relates to the changes of substances making up the matter. For example, corrosiveness, ...
... Properties of Substances • Physical properties: • Physical properties are descriptions of matter such as color, density, viscosity, boiling point, and melting point. • Chemical properties: • Chemical properties relates to the changes of substances making up the matter. For example, corrosiveness, ...
Ch 2 ppt - Houston ISD
... • An element’s atomic number is the number of protons in its nucleus • An element’s mass number is the sum of protons plus neutrons in the nucleus • Atomic mass, the atom’s total mass, can be approximated by the mass number Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings ...
... • An element’s atomic number is the number of protons in its nucleus • An element’s mass number is the sum of protons plus neutrons in the nucleus • Atomic mass, the atom’s total mass, can be approximated by the mass number Copyright © 2008 Pearson Education, Inc., publishing as Benjamin Cummings ...
PHYSICAL SETTING CHEMISTRY
... the instructions from the proctor for completing the student information on your answer sheet. Record your answers to the Part A and Part B–1 multiple-choice questions on this separate answer sheet. Record your answers for the questions in Part B–2 and Part C in your separate answer booklet. Be sure ...
... the instructions from the proctor for completing the student information on your answer sheet. Record your answers to the Part A and Part B–1 multiple-choice questions on this separate answer sheet. Record your answers for the questions in Part B–2 and Part C in your separate answer booklet. Be sure ...