Adv Science

Image: Twitter Summary: Atoms are the building blocks for everything in the world. Compounds are two or more atoms that combine to make something new. A chemical reaction is when atoms come together or break apart to form new things. The Law of Conservation and Mass states that atoms cannot be created or destroyed, only rearranged. Extra atoms after a chemical reaction become waste to be used in another reaction. Atom economy is the attempt to have as few atoms leftover from a reaction as possible. An experiment of burning sulfur proved that weight can transfer during a chemical reaction. During this experiment the burned sulfur weighed less than it did before, but the air around it weighed more.  S&EP-Conducting Investigations: You can tell that a chemical reaction occurred if gas was created, a change in temperature, and a change in color. There are times when a reaction occurs, but you cannot tell because the reaction is going at such a slow pace. This week i...

Image:  wikiHow Summary:  Balancing equations can be confusing at times, but there are a few simple steps to follow that can insure that you balance an equation correctly. First of all, you need to find an equation to balance. You definitely need an unbalanced equation otherwise you have nothing to balance. Next, you need to draw boxes around each and every compound. This is so that you do not touch or change the compounds. After that, make an atom inventory. It may sound confusing, but all that means is count the atoms on both sides of the chemical equation. Look at the subscripts next to each atom to find the number of atoms in the equation, if there is no number after the element, then there is only 1. Then, write coefficients for each compound until both sides are equal. The biggest rule is you can never ever ever ever ever ever touch the subscripts, you can only add coefficients. Lastly, you have to continue counting the atoms and adding coefficients until b...

Image: Middle School Chemistry Summary:  A covalent bond is a bond that forms when atoms are sharing electrons. Covalent bonds occur with non metals. Fun fact, when the atoms are apart the electrons are traveling all around, but when they are close they stay in between the two nuclei. When the atoms form a covalent bond and are together the potential energy lowers and the atoms are more stable. In order to form a covalent bond both atoms need a strong enough attraction and they need the room for the electrons in their outer shell.A positive ion is an atom that has lost one or more electrons giving it a positive charge. A negative ion is an atom that has gained one or more electrons giving it a negative charge. To form an ionic compound you need both a positive and negative ion. Metals have a tendency to lose electrons to form a positive ion, while non metals normally gain electrons to form a negative ion. An ionic bond forms between a metal and a nonmetal. An ionic bond is h...

Image: Google Sites Summary: A pure substance is a sample of matter that has definite chemical properties. An element is a pure substance that cannot be separated. A compound is two or more different pure substances that are joined by chemical bonds. A mixture is two or more pure substances that are not chemically bonded. A heterogenous mixture is the least mixed mixture and is the easiest to take apart. An example or way to visualize this would be a salad. A homogeneous mixture, also known as a solution, can be separated by physical means. It appears the same throughout and is well mixed. A solution could be toothpaste or milk.  A colloid is when the particles are not dissolved, but they are mixed. Dissolving is not a chemical change. Fun fact, all living this are mixtures. S&EP- Conducting Investigations: We were transported to a castle built my the scientist Dmitri Mendeleev and we needed to get out. Each room was made of a different element in the periodic table....