Which of the following is a general trend for the ionization energy of elements in the periodic table? a. increases from left to right; increases from bottom to top b. increases from left to right; decreases from bottom to top c. decreases from left to right; increases from bottom to top d. decreases from left to right; decreases from bottom to top e. none of the above 60. Which of the following groups of elements has the highest ionization energy? a. Group IA/1 b.
Add 3.0 mL of 1.0 M Copper (II) nitrate to the test tube. Add 5.0 mL of sodium hydroxide to the test tube; mix the reaction with a stirring rod. Feel the bottom of the tube and write down any changes you notice. Place test tube into the heated beaker and heat the tube until no changes are happening. Write down everything you notice.
54Cr 24 g. 52Cr 24 f. e. 14C 6 d. 50Cr 24 c. 12C 6 b. 63Cu 29 a. 17O 8 Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc. Chemistry: Matter and Change • Chapter 4 Mass contribution ( ؍mass)(percent abundance) For 27X: (27.977 amu)(92.23%) 08.52 ؍amu For 28X: (28.976 amu)(4.67%) 53.1 ؍amu For 29X: (29.974 amu)(3.10%) 929.0 ؍amu Atomic mass of X 08.52 ؍amu ؉ 1.35 amu ؉ 0.929 amu 80.82 ؍amu The element is silicon. Mass (amu) Isotope element. Show all your work.
Materials: 3 beakers Thermometer 3 Alka-Seltzer tablets Stopwatch Mortar and pestle Source of hot water Ice cubes Graph paper Procedures: Hot water- Run water from the hot tap until it is hot as possible Fill beaker with 80 mL of hot water Use thermometer to take temperature of water. Record in data table. Remove 1 Alka-Seltzer tablet from package Drop into the water. Measure the time it takes for the tablet to completely dissolve. BE READY WITH THE STOPWATCH.
| Experiment #3Weight of Zinc: 2.0 gramsWeight of Iodine: 1.1 gramsExperiment #6Weight of Zinc: 2.02 gramsWeight of Iodine: 2.5 grams | 3. Then add 5 mL of acetic acid (acidified water) into the “R” boiling tube, and then after you pour it swirl vigorously. Continue swirling until the tube turns back into room temperature. Then you have to decant the solution in boiling tube “R” into boiling tube “P” without any granular zinc leaving boiling tube “R”. Then wash the zinc in the boiling tube “R” by adding 5 mL of acidified water, swirling and then decanting the solution into the “p” boiling tube.
| Experiment #3Weight of Zinc: 2.0 gramsWeight of Iodine: 1.1 gramsExperiment #6Weight of Zinc: 2.02 gramsWeight of Iodine: 2.5 grams | 3. Then add 5 mL of acetic acid (acidified water) into the “R” boiling tube, and then after you pour it swirl vigorously. Continue swirling until the tube turns back into room temperature. Then you have to decant the solution in boiling tube “R” into boiling tube “P” without any granular zinc leaving boiling tube “R”. Then wash the zinc in the boiling tube “R” by adding 5 mL of acidified water, swirling and then decanting the solution into the “p” boiling tube.
3. Take off the hot plate when the bubbling of the crystals has stopped. 4. Let cool and mass the evaporating dish and alum. 5.
For example, if you mix aqueous solutions of AgNO3 and NaCl, there are two new combinations of ions possible. The silver nitrate solution contains Ag+(aq) and NO3-(aq). The sodium chloride contains Na+(aq) and Cl-(aq). Possible new combinations of these ions are AgCl and NaNO3. Note: these formulas would have been written in the upper right hand corner of each box before beginning the lab.
With your fingertips, pinch the sides together of the empty pipette labeled HCl. 13. Gently tip the 24-well plate towards you so that the drops of HCl are puddled together along the bottom rim. Insert the stem of the pipette into the puddle and release the pressure of your fingers to suck all of the HCl into the pipette. 14.
Name___________________________ Period_________________ Chemical Bonds Review Sheet Part one Write the definitions for each of the following terms. Octet rule Cation Anion Ionic compound Monatomic ion Covalent bond Molecular compound Nonpolar covalent bond Polar covalent bond Single bond Double bond Triple bond Part 2 1. Which has a greater potential energy, a noble gas or a metal? Explain your answer. ________________________________________________________________ ________________________________________________________________ ________________________________________________________________ 2.