'G sample' diaporamas de présentation

Station One

Station One. Determine the number of moles in 62.8g of barium acetate. Station Two. How many formula units are in a 61.8 g sample of potassium phosphite?. Station Three. Determine the number of atoms of nitrogen in 14.8 g of ammonium nitrate. Station Four.

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Chapter 21

Standardized Test Preparation . Chapter 21. Preview. Multiple Choice Short Answer. Standardized Test Preparation . Chapter 21. Multiple Choice. 1. Complete the following nuclear equation: A. B. C. D. Standardized Test Preparation . Chapter 21. Multiple Choice.

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Chapter 10 - Review States of Matter

Chapter 10 - Review States of Matter. Milbank High School. Chapter 10 - Review. What happens to the range of energies of the molecules in matter when the temperature is increased? What happens to the average kinetic energy of the particles in a sample of matter as the temperature is increased?.

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Nuclear Chemistry Review

Nuclear Chemistry Review. An unstable nucleus ____. a. increases its nuclear mass by fission b. increases its half-life c. emits energy when it decays d. expels all of its protons. Ionizing radiation that consists of helium nuclei is ____. a. Alpha Radiation b. Beta Radiation

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Thermochemistry

Thermochemistry. the study of transfers of energy as heat that accompany chemical reactions and physical changes. Heat and Temperature. Energy absorbed or released as heat in a chemical or physical change is measured in a calorimeter .

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BACK TITRATION

BACK TITRATION. NUR SYAKINA BINTI ISHAK NUR RAIHAN BINTI MOHD AZMI NURUL SYAZWANI BT SHAFIEE NUR MIRA NABILAH BINTI JAMALUDIN NURUL ASYIQIN BINTI KHAIROLL ANNUAR WAN NURULIYANA HAFIEZAH BINTI WAN ISMAIL NURFATHINISSA BINTI ROSLAN. Back titration.

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Introduction to inference Tests of significance

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Multi-Step Conversions

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Normality volumetric Calculations

Normality volumetric Calculations.

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Percentage Composition

Percentage Composition. What is percentage composition?. The mass of each element in a compound compared to the entire mass of the compound and multiplied by 100 percent is called the percentage composition of the compound. To calculate percentage composition:.

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Principles of Chemistry

Principles of Chemistry. Chapter 11 Review. Format of Exam. All problem solving Two periods Calculators and periodic tables 20 questions (5 points each). Four Sections. Mole conversions (8) Percent composition (4) Empirical and molecular formulas (4) Hydrates (4).

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Percentages and Percent Error

Percentages and Percent Error. Calculating Percents. Puts everything on a basis of 100. Percent (%) = # of items of interest x 100 total number of items. Sample Calculation. Our class contains 33 students. Of these, 18 are men and 15 are women.

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Openers 5-19 to 5-23

Openers 5-19 to 5-23. Chemistry. Monday. If a sample of Iodine 131 has an activity of 36cpm at 20cm. What will be the activity at 60cm?. Tuesday. Fermium-253 has a half life of 3 days. How much of a 160g sample will be left after 3 weeks?. Wednesday.

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PERCENT COMPOSITION

PERCENT COMPOSITION. The percent composition is the mass percentage of each type of atom(element) in a compound . % X = (total atomic mass of X / molar mass which contains X) For Example: Calculate the percent composition of nicotine, C 10 H 14 N 2 . Molar mass = 10C + 14H + 2N = 162 g/mol

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s ?T

energy (J). mass (g). Q. = m. s ?T. temp. change ( o C ) [Final temp-Initial temp]. specific heat (J/ g o C ).

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HIGHER GRADE CHEMISTRY CALCULATIONS

HIGHER GRADE CHEMISTRY CALCULATIONS. Half-life is the time taken for half of a radioisotope to decay. This value is constant for that particular radioisotope. Usually questions about radioactivity involve Half-life The time over which the radioactivity has been measured

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PERCENT COMPOSITION

PERCENT COMPOSITION. The percent composition is the mass percentage of each type of atom(element) in a compound . % X = (total atomic mass of X / molar mass which contains X) For Example: Calculate the percent composition of nicotine, C 10 H 14 N 2 . Molar mass = 10C + 14H + 2N = 162 g/mol

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1. What is the half-life of a 100.0 g sample of nitrogen-16 that decays to 12.5 g of nitrogen-16 in 21.6 s?

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Platinum pollution in road dusts, roadside soils, and tree barks in Seoul, Korea

Suburbs of Seoul (control area) (2.3 ng/g) Km Road dust Tree bark Roadside soil Grinding into powder form Sieving into <75 ?m (-200 mesh) 2 g sample + 21 ml HNO 3 + 7 ml HCl 200 mg sample + 3 ml HNO 3 + 0.5 ml HCl I. 60 ? for 30 min. Heating Microwave digestion II. 140 ? for 90 min.

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Mass Reactants = Mass Products

Mass Reactants = Mass Products. Law of Conservation of Mass: the mass of the reactants must equal the mass of the products. Law of Definite Proportions : a compound ( like H 2 O ) is always composed of the same elements in the same proportion by mass (no matter what the sample size).

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