Mira's Science Blogs

https://lh6.googleusercontent.com/LASySxSAAUVRxeaAuh2vQXp0da1Is88RHnWTV5gX3mCcX7MNYMvnnXJeet_GPmtNPfbRlSt0nlTih-_SF9oyNZMQJ5lhEgyS3krLsIknUe4zBod54C_DBS8fTXiLyejryA Summary: How are some chemical reactions different than others? There are four major types of chemical reactions. These include synthesis, decomposition, single displacement and double displacement. These types of chemical reactions show what happens to the molecules in the chemical reaction and how they are rearranged in various different ways.  The first type of chemical reaction is Synthesis. Synthesis is when two different molecules join together to create one larger molecule.  For example, Na + Cl → NaCl. In t hat chem ical  reaction , the sodium and ch lorine joined and created sodium chloride or table salt.  Link Another type of chemical reaction is decomposition, which is the opposite of synthesis. One compound breaks up into each element that made up that molec...

http://www.mikeblaber.org/oldwine/chm1045/notes/Stoich/Equation/coeff.gif Summary: This week we learned about chemical reactions and how they are represented. Chemical equations show what happens when a chemical reaction takes place. In a chemical reaction, bonds between the atoms are broken and created to form new molecules. There are many chemical reactions in your everyday life. Some examples are when you are cooking, baking or even if a banana is rotting. There are many ways you can tell if a chemical reaction has taken place including: Change in color (ex. If  an apple starts to become yellow on the inside) precipitate formula (ex. If you mix ink in water) Gas Formation Odor/Smell (Ex. when you bake something, it might smell very good) Temperature Change Change in Acidity In a chemical equation, there are a few important symbols and parts that you need to look out for. Subscripts  are at the end of an element symbol and tell us how many atoms are in...

https://cdn.instructables.com/FQQ/NKZM/IMDZBTJ3/FQQNKZMIMDZBTJ3.MEDIUM.jpg Summary: This week, we learned how to count atoms in a formula. To count the number of atoms in the molecule, first, you need to figure out how many elements are in the formula. To do this, you know that only the first letter is capitalized in an element and that there is only one letter capitalized. For example, in the common-known molecule H₂O, we know that there are two elements, hydrogen and oxygen because there are two capital letters.  The first component in the formula for a molecule is a subscript. Subscripts tell you how many atoms are in the element symbol right in front of the subscript. For example, in H₂O, the subscript means that there are two hydrogen atoms. If there is no subscript, it means that there is only one atom in the element. Another component in the formula in the Coefficient. This is the number that goes before the rest of the formula. It also is a bigger number com...

Summary: During this project, I learned a lot about the structure of the periodic table. The columns or families in the periodic table need to have similar properties and show periodicity, meaning that there is a gradual change as you move up or down. In the periodic table, this gradual change is in the number of energy levels with electrons. Each row also has a name which describes the elements in that row. For example, the first row consists of alkali metals. The rows or periods are arranged by atomic number, which is the number of protons. The atomic number is also increasing. As you move down the period, there is an increasing number of outer electrons. The atomic mass, the number of protons added with the number of neutrons, is also increasing.  I also learned how to identify the elements and how each element is displayed on the periodic table. There are four important pieces of information that you can gather about each element. The atomic number is on the t...

https://image.slidesharecdn.com/theperiodictable-110223090122-phpapp01/95/the-periodic-table-7-728.jpg?cb=1298451775 Summary: This week, we have been learning about how the periodic table is arranged and the different patterns that are in the rows  and columns. In the periodic table, the rows are called periods. Along the rows, the elements are organized by atomic number (the number of protons.) The rows also have the same energy level or the number of electrons. For example, in the first row, all of the elements' atoms have one energy level, and so on.The atomic mass is the number of neutrons plus the number of protons. The atomic mass can be a decimal, and it is ordered increasingly. The columns in the periodic table are called groups or families. Each family has a name. For example, group one is composed of alkali metals which is the family with Lithium, Sodium, and more. Each group also has the same number of outer, or valence electrons. The elements in group one ...

Dear friends of the National Science Foundation, I have heard that you are having difficulties understanding my friend, Dmitri Mendeleev's work with the periodic table of elements. In this letter, I will help you understand and learn about Mendeleev and his findings. I can try to help explain how various different patterns and different proof to show you why Dmitri Mendeleev is accurate, and his findings are correct. At the end of this letter, I hope you will make the best decision whether to shut him down. First, I will give you a little background about his life so that you can see how much trouble has gone into his work. Dmitri Mendeleev was born in 1834. He was the youngest in his family. When he was young, his father went blind. His mother's glass factory burned down. Even with all of these misfortunes, his mother was determined that he had to get the best education, so they traveled to St. Petersburg. Just a little bit later, his mother died of tuberculosis, and more of...

https://www.livescience.com/28507-element-groups.html Summary: This week we learned about the different families and groups of the periodic table and how they are classified. The periodic table is organized by the increasing atomic number or the number of protons. When you look at the periodic table, you can see that to the right, there is a "staircase." The elements that make up the staircase are metalloids, which are both metals and non-metals. Everything to the left of the staircase is a metal, and everything to the right is a non-metal. Rows of the periodic table are called periods. The elements in a row have different chemical properties. However, in a row, there are the same energy levels. The columns, or "families" in the table have similar chemical & physical properties because they have the same number of outer electrons.These are called "families" because they are all similar, but not all the same element.  There are 8 groups...