🏷️ LIMITED TIME OFFER: GET 20% OFF GRADE+ YEARLY SUBSCRIPTION →

HomeClass Notes1,200,000US530,000

CHE 1100 Lecture Notes - Lecture 17: Chemical Equation, Employee Benefits, Sodium Bromide

37 views4 pages

23 Mar 2017

School

Baylor University

Department

Course

Professor

For unlimited access to Class Notes, a Class+ subscription is required.

Document Summary

Che 1300 si - chapter 6: chemical reactions. The term chemical reaction is a synonym for chemical change, which we learned in. They involve a rearrangement of the grouping of atoms. Color change, a solid precipitate forms, bubbles form, heat is produced or absorbed, light is emitted, a new odor is observed. This means that the number of atoms of one element in the reactant side of the equation must equal the number of atoms of the same element on the product side of the equation. But sometimes, an equation will be given like this: ch4(g) + o2(g) co2(g) + h2o(g) 2 hydrogen: here we can clearly see that the law of conservation mass is not upheld. Balancing chemical equations is the practice of altering the coefficients, the number in front of the element or compound, to give the same number of each element on both sides of the equation.

Related Documents

CHE 1100 Lecture Notes - Lecture 4: Iodine, Magnesium, Hydrogen Peroxide

CH 110 Lecture Notes - Lecture 3: Chemical Formula, Reagent, Aqueous Solution

CHEM 103 Chapter Notes - Chapter 3: Reagent, Stoichiometry, Minuscule 33

lavendercattle946

Related Questions

I need help doing my lab homework, I missed lab that day because, I was sick and it's due.

Chemical Reactions and Equations Learning objectives To observe physical and chemical properties associated with chemical changes To be able to give evidence for the occurrence of a chemical reaction To write a balanced chemical equation To identify areaction as a combination, decomposition, precipitation, single or double replacement, or combustion reaction ntroduction When a substance undergoes a physical change, it changes its appearance but not its composition. For example, when ice melts to form water, it undergoes a physical change from solid to liquid. In a chemical change, the composition of a substance is changed to give a new substance with different physical and chemical properties. For example, when silver tarnishes, the shiny silver (Ag) changes to a dull gray silver sulfide (AgaS). Not only has the chemical formula changed from Ag to Agus, but also the physical properties (shininess) of the substance have changed. Some examples of physical and chemical changes are listed in Table 1 below. Table 1. Comparison of Physical and Chemical Changes Examples of Physical changes Examples and Evidence of Chemical Changes Change in state (melting, freezing, evaporating Formation of a gas (bubbles) subliming) Formation of a solid (precipitate) Change in size Tearing Change in Color Heat is given off or absorbed A solid dissolving in a solvent In a chemical reaction, atoms in the reactants are rearranged to produce new combinations of atoms in the products. However, the total number of atoms of each element in the reactants is equal to the total number of atoms in the products. This is true according to the Law of Conservation of Mass, which states that the total mass remains constant during a chemical reaction. In other words, matter cannot be created or destroyed in a chemical reaction. In a chemical equation, the reactants are shown on the left and the products are on the right. An arrow in between indicates that a chemical reaction occurs. Finally, the physical state of each compound is designated in parentheses after the chemical formula. Solid, liquid, gas, and aqueous (dissolved in water) are shown as(s,(n,(g), and (aq), respectively.