• A sharp pin • Cellophane tape • A pencil • Paper Pre-Lab Questions: 1. The balloon is being tested and analyzed 2. We are using sight and touch 3. Independent= petroleum jelly Dependent= the balloon 4. Controls= Petroleum jelly Constant= the cellophane tape and a sharp pin Pre-Lab Questions for 2nd part of Lab: 1. The balloon is being tested and analyzed 2. We used sight as our scientific skills 3. Independent: the pin Dependent: the balloon 4. Control(s)= cellophane tape
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statements are correct? 1.|Metals generally lose electrons to become cations.| 2.|Nonmetals generally gain electrons to become anions.| 3.|Group 2A metals form ions with a 2+ charge.| a.|1 only| b.|2 only| c.|3 only| d.|1‚2‚ and 3| ANS: D OBJ: Goal #3.1: Interpret‚ predict‚ and write formulas for ionic and molecular compounds 5. What charge is most commonly observed for an oxide ion? a.|3-| b.|2-| c.|1-| d.|1+| ANS: B OBJ: Goal #3.1: Interpret‚ predict‚ and write formulas
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ELECTROSTATIC PRECIPITATOR – It works on the principle of electrostatic precipitation i.e. electrically charged particles are separated from the air by electrical field. It consists of – 1 Electrically charged (positive) collecting surface. 2 High voltage discharge electrodes. 3 Weight at bottom of electrode wire to keep the wire in position. Working – The polluted air enters from the bottom and flows upwards. The high voltage in the wire (50KV) ionizes the air. The negative ions move
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electric current. Bases: Aqueous solutions of bases taste bitter. Bases change the color of acid-base indicators. Dilute aqueous solutions of bases feel slippery. Bases react with acids to produce salts and water. Bases conduct electric current. 2. a. Distinguish between binary acids and oxyacids in terms of their component elements and the systems used in naming them. b. Give three examples of each type of acid. - Binary acids contain H atoms (which are released as H+ when the acid is dissolved)
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2NH3(g) 2. What is peptisation? 3. Write Reimer Tiemann reaction. 4. Why is CO stronger ligand that Cl-. 5. Write structure of 2-(2-Bromophenyl)butane. 6. Complete the reaction C6H6+R COCl 7. Why pentahalides more covalent than trihalides? 8. What is difference between nucleoside and nucleotide? 9. Explain the following- (a) Gattermann Koch reaction (b) HVZ reaction 10. How will you distinguish between the following. (a) Pentan-2-one and pentan-3-one
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Test #3 Chapter 2: 1) What is matter? 2) What is mass? 3) Matter that has a uniform and definite composition is called a ______. Give an example. 4) A quality/condition of a substance that can be observed/measured without changing the substance is a ________ __________. Give examples. 5) What are the three states of matter? Put the correct state of matter in each box. 6) What is the difference between gas and vapor? 7) What is a physical change? Give an example. 8) A physical blend
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Company #1: Neils Bohr Equation: 3Na2CO3 + 2AlPO4 = 2Na3PO4 + Al2(CO3)3 Reaction: Double Displacement Company #2: Hello Equation: C5H12 + 8O2 = 5CO2 + 6H2O Reaction: Combustion Company #1 Neils Bohr 3Na2CO3
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characteristic wavelength. Example. Calculate the wavelengths of the following objects. (a) a baseball weighing 142 g thrown at 142 km/h. (b) a helium atom moving at a speed of 8.5 x 105 m/s. The importance of the above example...... CH 5-2-3 The
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25 posts - 16 authors Figure 2: Preparation of nitroguanidine from guanidine nitrate. ... 200g sulphamic acid and 124g urea were mixed in a shallow Pyrex bowl and ... [PDF] Instructions for HACH HR Nitrate Analysis www.d.umn.edu/~dlong/.../Instruction-Nitrate-HR-TNT836.pdf Nitrate. Nitrate. Page 5 of 6. Summary of method. Nitrate ions in solutions containing sulfuric and phosphoric acids react with 2‚6-dimethylphenol to form 4-nitro-2 ... chemical denitrification of
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bonds are bonds that don’t give or take any electrons. In stead they share the elctrons 50) Which of these compounds contain elements that do not follow the octet rule? Explain. a) NF3: 5 + (7*3) = 26 b) PCl2F3: 5 + (7*2) + (7*3) = 40 c) SF4: 6 + (7 *4) = 24 d) SCl2: 6 + (7*2) = 20 The answer is “d” because it does not have eight valence electrons. 64) Explain why each electron structure is incorrect. Replace each structure with one that is more acceptable. a) It is incorrect because
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