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Chemistry

Where sugar originated

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Sugarcane
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sugar
Sugar originated in New Guinea around 8000 BCE, the process of turning sugarcane juice to crystals was discovered by the Indians. This is done by extracting the juice from the sugarcane by grinding or pounding on it, the leaving it out in the sun to dry or by boiling it. It was easier to store and very easy to transport. From archeological and literary evidence, historians have located some key sites of early cultivation were India, the Philippines Islands, and Indonesia

Egg Mystery Lab - Osmosis

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Biology
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Semipermeable membrane
Internet
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Osmosis

Raw Egg Mystery Lab Purpose: Conduct an experiment in which you quantitatively and qualitatively demonstrate the effects of materials moving into and out of a semi-permeable membrane, an egg. Materials: 1 egg Balance Water Vinegar Beaker String Corn Syrup Ruler Safety: Wash hands after handling eggs. 2) Eggs are very fragile. Write the following: What will happen to an egg (cell model)placed in the following solutions? (Must be stated in ?If/then? format.) Vinegar Solution: __________________________________________________________________. Water:____________________________________________________________________________. Sugar:____________________________________________________________________________. Procedure: Day 1:

Notes

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Chemistry
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Chemical bonding
Chemistry
Pi bond
Triple bond
Sigma bond
Double bond
Molecular orbital
Bond
Chemical bond
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molecular
magnetism

Name: _________________________________ What You Need To Know for the Chemistry Regents Exam The Test The Chemisty Regents Exam is broken down into three sections: Part A: 35 mulitple choice questions from all units covered over the course of the school year. Part B: Approximately 25 questions, with a mix of short answer and multiple choice. Questions focus on the Reference Tables, graphing, and laboratory experiments. Part C: Approximately 15 short answer questions, most broken down into smaller parts. This is often an eclectic, unpredictable mix of questions from various units, and may demand students write short paragraphs, use equations and reference tables, or draw graphs and diagrams in order to correctly answer the questions.

molarity and dilution

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Chemistry
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Chemistry
Analytical chemistry
Solutions
Chemical properties
Colloidal chemistry
Dilution
Equations
Molar concentration
Mole
Technology

Molarity Worksheet 1. Sea water contains roughly 28.0 g of NaCl per liter. What is the molarity of sodium chloride in sea water? 2. What is the molarity of 245.0 g of H2SO4 dissolved in 1.00 L of solution? 3. What is the molarity of 5.30 g of Na2CO3 dissolved in 400.0 mL solution? 4. What is the molarity of 5.00 g of NaOH in 750.0 mL of solution? 5. How many moles of Na2CO3 are there in 10.0 L of 2.0 M soluton? 6. How many moles of Na2CO3 are in 10.0 mL of a 2.0 M solution? 7. How many moles of NaCl are contained in 100.0 mL of a 0.20 M solution? 8. What weight (in grams) of NaCl would be contained in problem 7? 9. What weight (in grams) of H2SO4 would be needed to make 750.0 mL of 2.00 M solution? 10. What volume (in mL) of 18.0 M H2SO4 is needed to contain 2.45 g H2SO4?

Radioactive Decay

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Environmental Science
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Chemistry
Physics
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Nuclear chemistry
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Define the following terms: Stable- Not likely to change or fail; firmly established Unstable- Prone to change, fail, or give way; not stable Radioactive Decay- The process in which a radioactive nucleus emits (gives off) radiation and changes to a different isotope or element. A number of different particles can be emitted by decay. The most typical are alpha, beta particles, and gamma rays. Radio Isotope- The process in which a radioactive nucleus emits (gives off) radiation and changes to a different isotope or element. A number of different particles can be emitted by decay. The most typical are alpha, beta particles, and gamma rays. Daughter Element- an element that results from the radioactive decay of another element.

Investigating the effect of nicotine on the heart rate of Daphnia

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Biology
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Medicine
Human behavior

SBI4U Shonara Gibson December 7, 2010 Partner: Helen Picard Investigating the Effect of Nicotine on the Heart Rate of Daphnia Results: Table 1: Heart Rate of Daphnia with Various Amounts of Nicotine Present in Surroundings Amount of Nicotine in Surroundings (drops) Heart Rate (beats per minute) Average Variation Daphnia #1 Daphnia #2 No nicotine 384 372 378 10% of 378 = 38 Variation 6 6 6 1 drop 402 414 408 10% of 408 = 41 Variation 6 6 6 2 drops 420 420 420 10% of 420 = 42 Variation 0 0 0 3 drops 510 480 495 10% of 495 = 50 Variation 15 15 15 Figure 1: Graph showing Heart Rates of Daphnia with Increasing amounts of Nicotine Present in Surroundings Sample Calculations:

Empiricl Formula Lab Write up

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Chemistry
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Chemistry
Matter
Magnesium
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Technology

5. Empirical Formula of a Compound Chem 1111 Revision S7 Page 1 of 6 Cautions Magnesium ribbon is flammable. Ammonia gas is toxic and harmful. Hot ceramic crucible and metal items can produce a severe burn. Purpose The purpose will be to determine the empirical formula of magnesium oxide by burning the pure magnesium metal in air. Introduction The simplest whole number ratio of moles of the elements in a compound is known as the Empirical Formula. This can be determined experimentally if a chemical compound can be synthesized from an element. This process requires three steps: 1. Determine the mass of each element in the compound 2. Calculate the number of moles of each element in the sample.

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