54Cr 24 g. 52Cr 24 f. e. 14C 6 d. 50Cr 24 c. 12C 6 b. 63Cu 29 a. 17O 8 Copyright © Glencoe/McGraw-Hill, a division of the McGraw-Hill Companies, Inc. Chemistry: Matter and Change • Chapter 4 Mass contribution ( ؍mass)(percent abundance) For 27X: (27.977 amu)(92.23%) 08.52 ؍amu For 28X: (28.976 amu)(4.67%) 53.1 ؍amu For 29X: (29.974 amu)(3.10%) 929.0 ؍amu Atomic mass of X 08.52 ؍amu ؉ 1.35 amu ؉ 0.929 amu 80.82 ؍amu The element is silicon. Mass (amu) Isotope element. Show all your work.
Lab Questions 1.Use the data to determine the molar mass of the "unknown" metal sample, -1st Trial: 21.1mmHg ; 2nd Trial: 21.1mmHg 2. How many moles of metal reacted? -1st Trial: 1.0129 atm H2 ; 2nd Trial: 1.0129 atm H2 3. How many moles of hydrogen are produced in this reaction? - 1st Trial : 0.001216 mol H2 ; 2nd Trial: 0.001216 mol H2 4.
Name___________________________________ periodic table review 3 12/5/2006 Page 1 Key Terms 1. What is the name of the family of elements in Group IA/1? a. alkali metals b. alkaline earth metals c. halogens d. noble gases e. none of the above 2. What is the name of the family of elements in Group IIA/2? a. alkali metals b. alkaline earth metals c. halogens d. noble gases e. none of the above 3.
Unit 2 ( Isotopes Problem Set 2-2 1. Which of the following are isotopes of element X, with atomic number of 9: [pic],[pic],[pic], and [pic]. 2. For each of the following isotopes, write the nuclear symbols: a. Cu-63, Cu – 65 b. C-12, C-14 c. Mg-24, Mg-25, Mg-26 d. Ne-20, Ne-21, Ne-22 3. Verify that the atomic mass of magnesium is 24.31 amu, given the following information: [pic], mass = 23.985042 amu; percent abundance = 78.99% [pic], mass = 24.985837 amu; percent abundance = 10.00% [pic], mass = 25.982593 amu; percent abundance = 11.01% 4.
When researching the birth of the battery, textbooks will credit Count Alassandro Volta with the creation of the electric battery, which was invented in 1800. But, a great find in Baghdad is believed to discount this honor. As you can also assume from his name, the measurement of potential electric output is called the volt. Referred to as the Baghdad Battery, this artifact was discovered within the ruins of a Parthian village, which is estimated to date back to between 248 B.C. and 226 A.D.
Indirect Gravimetric Determination of a Hydrated Compound in a Mixture Morgan Dufer I. The purpose of this lab was to find the percent of BaCl2*2H2O in a sample of unknown composition by using gravimetric analysis. II. Pre-lab Questions 1. What mass of MgCO3 is contained in a 2.750g solid sample consisting of only MgCO3 and MgO if heating to decompose all the MgCO3 according to the following equation leaves a solid residue weighing 2.160g?
Robert Boyle Jacques Charles January 25, 1625-December 31, 1691 History Robert Boyle was a 17th century philosopher, chemist, and physicist. He is best known for Boyle’s Law. He is the founder of modern chemistry. November 12, 1746-April 7, 1823 History Jacques Charles was a French inventor, scientist, mathematician, and balloonist. Charles was born in Beaugency-sur-Loire in 1746; He married Julie Françoise Bouchaud des Hérettes in 1784–1817.
Brief Overview & Main Points Dr. Mortenson begins by explaining the dominant view before the 19th century, which was that God had created the earth in six 24-hour days about 400 B.C. and about 1600 years later, the earth was judged with a global flood during the time of Noah. It wasn’t until the late 18th century that different theories of how the earth began started to surface. These new views were “evolutionary and naturalistic in character,” and God was left out of the picture (Mortenson, 2003). Dr. Mortenson introduces a few French scientists who searched for answers through this old earth theory.
This power was focused into the form of a bomb. This bomb would define life for everyone on the earth for the nearly the next 60 years. Although people feared the power of the atomic bomb and later the hydrogen bomb it was a necessary step in the advancement of the scientific understanding of the universe. The main catalyst for the building of the atomic bomb is a letter written to president Franklin D. Roosevelt by the famous physicist Albert Einstein (1). Einstein wrote this letter after learning of the work of Austrian physicist L. Szilard on nuclear fission.