Mole fraction Study guides, Class notes & Summaries

What does sensitivity mean? - discriminate between small differences in concentration What does selectivity mean? - degree which method is free from interference of other species What does detection limit mean? - min. concentration/ mass of analyte detected with known confidence level What are the criteria for selecting a method? - precision, bias, sensitivity, detection limit, concentration range, and selecitivity What are the axis for the standard addition method? - absorbance versus sta...

Highest: Nh3 SbH3 AsH3 PH3 The hydrides of group 5A are NH3, PH3, AsH3, and SbH3. Arrange them from highest to lowest boiling point. Dispersion What is the strongest type of intermolecular force present in H2? Co2 Identify the compound that does not have dipole-dipole forces as its strongest force. 1 and 2 Which of the following must be overcome during the boiling of acetonitrile, CH3CN? 1. dispersion forces 2. dipole-dipole forces 3. hydrogen bonds I>III&gt...

General Chemistry ACS EXAM Review 168 Questions with Verified Answers Rutherford's Gold Foil Experiment - CORRECT ANSWER proposed that atoms consist of a tiny, massive, positive nucleus surrounded by electrons nucleus - CORRECT ANSWER contains all the positive charge and nearly all the mass of the atom James Chadwick - CORRECT ANSWER discovered the neutron cathode rays - CORRECT ANSWER move from negative electrode to positive electrode (like electrons in a voltaic cell) Thompson...

Portage Chemistry 103 Module 2 Exam SOLUTIONS 100% CORRECT ANSWERS 2.1: MOLECULAR WEIGHT A compound is made up of two or more elements combined in a definite ratio that is represented by a molecular formula. Each of these elements has a certain atomic weight, which can be found in the periodic table. The sum of the atomic weights of the atoms in the molecular formula is called the formula weight or molecular weight or formula mass. Ca3(PO4)2 calcium phosphate Molecular Weight...

Intramolecular - Answer-forces holding atoms within molecules intermolecular - Answer-forces of attraction between molecules Ion-ion - Answer-strongest bonds; high melting temps; involve cations and anions ion-permanent dipole - Answer-salts + polar molecules (water); metal ions with water or other polar mol. dipole-dipole - Answer-bind molecules with PERMANENT dipoles; seen in BPs of simple molecules hydrophilic molecules - Answer-attraction to water; polar; O-H or N-H bonds; soluble in w...

m   1. Which of the following is the mRNA start codon in most cases? A. UAA B. AGU C. AUG D. UGA 2. Which of the types of RNA is the smallest? A. mRNA B. tRNA C. rRNA D. 3. Which of the following is not considered a pyrimidine? A. C B. T C. U D. G 4. Which of the following is paired correctly? A. A-G B. C-G C. A-U D. G-T 5. Which of the following characterizes a Western blot? A. Antibody/protein hybridization B. DNA/RNA combination C. RNA ...

Chemistry II ACS Exam 91 Questions with Verified Answers Phase - CORRECT ANSWER a physically distinct and homogenous part of a system intermolecular forces - CORRECT ANSWER the attractive and repulsive forces among the particles-molecules, atoms or ions in a sample of matter heat of vaporization - CORRECT ANSWER the enthalpy change occurring when 1 mol of a liquid substance vaporizes heat of fusion - CORRECT ANSWER the enthalpy change occurring when 1 mol of a solid melts heat of ...

STP - Answer-0°C and 1 atm Ideal Gas Law - Answer-PV = nRT At STP, 1 mol of gas will occupy ... - Answer-22.4 L Characteristics of an Ideal Gas - Answer-1. Gas molecules have zero volume 2. Gas molecules exert no forces other than repulsive forces due to collisions 3. Gas molecules make completely elastic collisions 4. The avg. kinetic energy of gas molecules is directly proportional to the temperature of the gas Partial pressure of a gas (equation) - Answer-Partial pressure equa...

True of False: Upon standing, the solute and solvent will NOT separate by gravity correct answer: True True of False: The solvent will always be liquid correct answer: False Definition of Molarity correct answer: moles of solute/volume of solution The name given for a solution that contains less solute than it has the capacity to dissolve correct answer: Unsaturated The name given for a solution in which the maximum amount of solute is dissolved correct answer: Saturated Name...

The change in enthalpy (delta-H) can be calculated as: Δ H = n C p Δ T This is correct whether the reaction is conducted at constant volume or constant pressure or neither. - correct answer true Antoine Lavoisier discovered which element? - correct answer O Which of the following hypotheses is NOT part of John Dalton's "Atomic Theory"? - correct answer Mass is neither cre...