CHEM 120 (CHEM 120)

Prelab Activity: Ionic Compounds 1 point for each complete table, 5 points total. This exercise is due at the start of lab. Ionic compounds are hard, brittle and crystalline in nature. Ionic compounds have high melting points compared to covalent compounds. Many ionic compounds are water soluble and conduct electricity. It is possible to identify a compound as an ionic compound or a covalent compound by observing properties such as melting point, solubility and ability to conduct electricit...

6. (TCO 6) A gas at a temperature of 95 degrees C occupies a volume of 165 mL. Assuming constant pressure, determine the volume at 25 degrees C. Show your work. (Points : 5) Using Charles’ Law, ( V1/T1) = (V2/T2). First, convert temperature to KELVIN (T1 = t1 +273) Thus, T1 = 95 + 273 = 368. We have V1 (165 mL) & T2 = (25 + 273) = 298. V2 = (V1*T2)/T1 = (165 mL*298)/368 = 133.6 mL. 0 7 Short 16 7. (TCO 6) A sample of helium gas occupies 1021 mL at 719 mmHg. For a gas sample at constant tempera...

CHEM 120 Week 4 Midterm Exam

CHEM 120 Unit 8 Discussion: Many Lifetimes of Plastic I chose the article that many lifetimes of plastic for this discussion topic as we hear in the news that plastic will not break down, and it will be there forever and ever and ever. This article, through the use of scientific methods and studying plastics in the environment, determined that this is not necessarily true. While researching scientific articles, it was found that most of the articles were not based on actual science. One of the...

CHEM-120 Unit 7 Discussion: Flow of Genetic Information 1ST POST: “YOU ARE THE FATHER!” A DNA paternity test compares a child's DNA pattern to determine if it is a match. It can be done in an accredited lab or in the comfort of your own home. When performed in an experienced, accredited laboratory, its 99.99% accuracy guaranteed and can in turn be used as a legal document. Use of the DNA has impacted so many people's lives. For example, helping find out the paternity of the child in c...

Week 6 Discussion: Radiation Hello everyone, For this weeks discussion I will do option 2 on the topic of Uranium- 238. Uranium-238 is the most common isotope of Uranium yielding 99.2 percent within natural uranium. Uranium- 238 has 92 protons and 146 neutrons. It was also recorded that it has a half- life of 4.5 billion years. a. Uranium- 238 is an ionizing radiation. b. Uranium- 238 gives off alpha particles which are not effectively penetrating so s long a its rays are found out...

CHEM 120 Unit 5 Discussion: Organic Chemistry For me 3rd post, I will write a condensed structural formula of a simple molecule with an ether, aldehyde, ketone, ester, or alcohol functional group for my peers to name. The Condensed structural formula is CH3CHCHCH3 How many Carbons does it contain? What Function group does it belong to? 1ST Post: Ether: An organic functional group consisting of a disubstituted oxygen, or an oxygen atom bonded to 2 carbon atoms, R-O-R. Ether is used as ...

Week 4 Discussion: Chemistry in the World Around Us Hello everyone! The acidic solutions that I found in and round in my house are: Vinegar that contains acetic acid. Vinegar occurs naturally and has a complex formula. It contains water and about 5-20% acetic acid. So Vinegar will have the chemical formula of water which is H2O and the formula for CH3COOH. Although acetic acid has a complex formula it is a weak acid. Vinegar is made through fermentation of a grain alcohol (ethanol) by the...

Unit 3: Solution Chemistry Learning Objectives: • To learn how to prepare solutions of specific concentrations • To learn about molarity, and % concentration. In this lab, we will learn how to calculate solution concentration and prepare solutions. For a given solution, different ways of expressing concentration are used depending on our purposes. Solutions made of the same substances but at different concentrations can have very different properties. For example, an animal cell pl...