Chemical And Periodic Properties: Charlie Ponyik And Dr. Renee Falconer

Mendeleev knew that there would be elements that would fill the entire table, but they were not yet discovered, so he left their spots blank. He organized the table by their increasing atomic mass. In this lab, our job was to mix unknown solutions with known solutions and record what happened once they were mixed. Once we completed our objectives for the lab, we were to group the solutions with similar characteristics like Mendeleev did when he was organizing his table. Unlike Mendeleev, we did not group ours with atomic mass.

Bases are a substance with a pH higher than 7, and have a high concentration of hydroxyl ions. Bases can react with acids in order to neutralise them in order to form salt and water. Bases are normally metal oxides or metal hydroxides. Sodium hydroxide for example is a base.

Explain how scientific observations led to the development of, and changes to, the periodic table.

https://en.wikipedia.org/wiki/Neutralization_(chemistry) An acid is molecule or ion capable of donating a hydron, or capable of forming a covalent bond with and electronic pair.https://en.wikipedia.org/wiki/Acid A base in chemistry, is a substance that can accept hydrogen ions.https://en.wikipedia.org/wiki/Base A covalent bond can also be known as a molecule bond, is a chemical bond that involves the sharing of electron pairs between atoms. https://en.wikipedia.org/wiki/Covalent_bond These electron pairs can also be known as shared pairs or bonding pairs. Electron pairs consist of two electrons that occupy the same orbital but they have opposite spins. Hydrogen ions is a common name for the aqueous cation H 30+, the type of oxonium ion made by protonation of water. It's the positive ion present an Arrhenius acid is dissolved in

“In a chemical reaction, atoms rearrange and bond together in different ways to create new substances”. Concentration is involved with the amount of acid added to a certain amount of water. Strength is used in acids to determine if they are weak or strong. A base can be defined as a substance that can accept a hydrogen ion from another substance.An acid can be defined as a substance that can donate a hydrogen ion, that is a proton, to another substance. Acids react with most metals, and the most common way to identify an acid is color change. One safe way to test for an acid is to place a few drops of solution on a compound that contains carbonate

In this lab we performed four test. Using these test we discovered how the chemicals compounds Citric Acid, Calcium Chloride, Sucrose, Potassium Iodine, Phenyl Salicylate , and Sodium Chloride reacted to heat and many solutions. We also noticed that Phenyl salicylate was the least reactive out of all chemical compounds. Using the information discovered from the lab we were able to separate the chemical compounds into two groups. In group one were the chemical compounds Calcium chloride, Citric acid, Potassium iodide, Sodium chloride, and Sucrose these chemical compounds reacted to three of the four test. Group two was just Phenyl salicylate which reacted to only one of the four test. We also were able to state that group one was a covalent compound group and, group two was an ionic compound

The book “The Periodic Table” by Primo Levi is undoubtedly a masterpiece. It showcases the enthusiasm, the level of dedication, and passion successful chemists such as Primo Levi himself had for the field of their expertise. The way Primo Levi has related the troublesome times and events he had to face in prospect with the elements of the periodic table is laudable. Primo Levi is surely an inspiration and a perfect example of prodigy and passion. Despite the challenges and the hardships inflicted on him by the bigoted group of Germens, he still managed to emerge as an exceptional chemist and an author who made great contributions to the modern chemistry as we now know it.

Filled with shiny, colorful pictures of elements in their many applications, the book was my first in-depth introduction to chemistry. Two pages were dedicated to each element and explained the most common uses. I started to spend time pondering what was in some of the objects around me. I viewed objects more in their elemental sense rather than “plate material” or “cardboard material”. Since then, I’ve only tried to expand my knowledge of the chemical makeup of my world.

The world of chemistry is based on the periodic table so without it there would be no chemistry. It has forever changed how people learn about and understand the elements and chemistry itself. The periodic table is named this because the elements are placed into periodic groupings based on their relations to one another. The periodic table has changed a lot over the years in order to develop into the periodic table used today. Hundreds of years have gone by and many people have contributed to creating the periodic table. A lot of predictions, trial and error, adjustments, and improvements have been made so that the current periodic table could be as accurate as possible. Many steps were required for the periodic table to even be created. For example, before

Conductivity is the ability to pass on electrical current within a solution, a metal or even a gas. It can be affected by other chemical related factors such as the concentration, temperature and also the mobility and valence of ions. Yet the most conductive form occurs within aqueous solutions as it contains both cations and anions; where the solvent stabilises the attracting ions through a process called solvation. Within the various levels of ionic strength from low to high electricity flow, electrolytes can either be strong or weak, according to the reaction. Strong electrolytes are substances that are fully ionised in solution due to the positive and negative ions that migrate under the influence of an electric field. Therefore the concentration

Meaning, compounds with the same type of bonding tend to be soluble with one another. Polar substances would dissolve in polar solvents such as water, however, would not dissolve in non-polar solvents. Non-polar substances dissolve in non-polar solvents but do not dissolve in polar ones. Most ionic compounds are able to be dissolved in water as the water molecules hydrate ions. For an ionic compound to be dissolved, the water molecules must stabilize the ions, which thus would result in the separation of the ionic bond to form a solution. Water is a polar molecule, it has a permanent dipole. The oxygen atom has a partial negative charge whilst the hydrogen atom has a partial positive charge. When an ionic substance is placed in to the water, the water molecules would quickly attract the charged ions from the substance. They then become free to move about. However, this only occurs when the attractive forces between the water molecules and ions are stronger than the attractive forces within the ionic compound. CaOH is a slightly insoluble compound, the solubility of CaOH is approximately 0.189 g/100 mL of water at 20. A more soluble ionic compounds solubility such as NaCl is only 35.7 g/100 mL of water at 20°C. CaOH is only slightly insoluble as calcium and oxygen are +2 and -2 ions in

For the lesson observed the objectives was to explain the trends of the periodic table based on the elements’ valence electrons and atomic numbers. Additionally, students were responsible for applying their previous knowledge in calculating subatomic particles to review the Bohr Models and discus the relationship among families in the periodic table. Students will use the information from today’s lesson to make future judgments on reactivity and bonding created during chemical reactions in the next unit. Lastly, students were to connect the information on elemental properties to previous experiences with their health, commercial products, and everyday life.

Dissociates when dissolved in water, are electrical conductors, and is often soluble in water are some properties of ionic compounds. When ionic compounds are dissolved in water, the ionic compounds dissociated into the water and become free. So, their positive and negative charged particles move around and they form an electrical current. Which this is why and how ionic compounds are excellent conductors of electricity when dissolved in water.

The periodic table is one of the most known things in science. It has elements, metals, non-metals, solids, liquids and gases. The beginning of the periodic table starts back in 1669 when a German merchant and alchemist named Hennig Brad began creating a Philosophers Stone. He then discovered Phosphorus. A few years later in 1809 47 elements had been discovered, in 1863 chemist John Newlands began forming the elements in groups and discovering more which was a total of 56 he divided them into 11 groups. The development of the periodic table began in 1869 by a man named Dimitri Mendeleev arranging the element by there atomic mass he also thought of other elements that may be discovered eventually so he

Human origins, evolution, and diffusion are important for understanding the history of Africa. African historians take pride in the fact that Africa is most certainly the birthplace of humanity. There is evidence showing that humanity began in Africa by remains left behind by human groups and societies. They have retrieved fossils of living organisms, and even written records, like cave drawings. Dating back millions of years ago Africa provides the best time line of human development because other parts of the world do not have evidence dating back as far as in Africa. Where did humanity and human history begin? There are theories supporting both that, humans evolved from various parts of the world, and that humans rose in Africa then migrated to other parts of the world and continued to develop. The theory that has the most support is that humanity rose in Africa then moved to other regions of the world. Africa is indeed the home of humanity but because Africa is where humanity began they were not able to be at the top of the evolutionary ladder because their global location did not allow them to develop faster. Human history in general is difficult to understand but we can look at the past to learn more about where we came from and how our societies have developed.