Melting points Study guides, Class notes & Summaries

Which of the following are a general characteristic of amides? A) They have high melting points. B) Most are solids at room temperature. C) Solutions in water are acidic. D) A and B E) A, B and C correct answer: Answer: D) A and B A) They have high melting points AND B) Most are solids at room temperature. Many amine medications, RNH2, are neutralized with aqueous HCl and sold as RNH3+Cl- salts. Predict the best reason why these medications are sold as amine salts instead of free...

Fracture is a type of material failure. Of the following which is another type of material failure? - Permanent deformation. Which of the following statements best differentiates between a defect and a discontinuity? - Discontinuities can propagate and become defects. Nondestructive testing is often differentiated from other measurements or inspection techniques in that: - NDT involves indirect tests related to some other quality or characteristic of material. What are the functions of ...

CEM 141 Exam 3 Questions and Answers Already Passed change of state from solid -> liquid -> gas ________ energy requires energy needed to phase change from solid --> liquid --> gas comes from: the surroundings when phases change from solid --> liquid --> gas, interactions are _______ between molecules overcome change of state from gas --> liquid --> solid ______ energy releases what happens to the energy from a phase change from gas --> liquid --> s...

OCR A LEVEL ORGANIC CHEMISTRY YEAR 12 WITH VERIFIED QUESTIONS AND ANSWERS What is the melting and boiling points of alkanes like? - ANSWER--as chain length increases so does the strength of the intermolecular forces as there is greater surface area for contact between molecules and hence stronger london forces and therefore the melting/boiling points are highr for longer chain. What is a structura/chain isomer? - ANSWER--Same molecular formula but a different structural formula Wh...

Lesson 6 Quiz 4 / 4 points Most people don't realize that once something starts to melt, cranking up the heat does't make the temperature of the substance higher, at least not until it is ALL melted. When you add lots of extra heat to a solid that is in the process of melting, what ends up happening to all of this extra energy you are adding? It is used to do what? Question options: expand the solid. change solid to liquid. change the liquid back to solid. overcome the intermolecula...

Week 8 Final Exam (timed and single access) Overall Grade (highest attempt): 96 / 100 - 96 % Question 1 2/2 points Pyroclastic flows are more associated with __________. ocean hot spots stratovolcanoes shield volcanoes flood basalts cinder cones Question 2 2/2 points In the rock cycle, what processes directly link igneous rocks to metamorphic rocks? compaction and cementation melting and crystallization deposition and lithification recrystallization by high heat and pressure weathering and erosi...

chem210:exam1 study guide, complete verified solution, A+ guarantee, 2024. properties of organic compounds non-polar; flammable; covalent bonds; insoluble in water; carbon containing molecules; non-conductor in electrolytes; LOW boiling and melting points; gas at room temp. properties of inorganic compounds polar; non-flammable; ionic bonds; soluble in water; conducts electricity; solid at room temp; HIGH boiling/melting points What is the trend in solubility and boiling point/melting...

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 ...

AQA GCSE Chemistry Exam Questions With 100% Correct Answers What is a compound? - answerwhen two or more elements react together What is an atoms? - answerthe smallest part of an element that can still be recognised as that element What is a molecule? - answerwhen atoms join together by chemical bonds What is an ion? - answera charged particle produced by the loss or gain of electrons How do the atoms of elements gain stable electronic structures? - answerjoining together by sharing elec...

Med Biochem Exam 3 Questions With Accurate Answers A+ What are epinephrine's effects when binding to receptors in each of the following cells: - Muscle or liver cells - Adipose cells - Heart cells - ANS-- Muscle or liver cells: induces breakdown of glycogen - Adipose cells: induces lipid hydrolysis - Heart cells: increases heart rate Two classes of lipids: - ANS-Based on structure/function Lipids that do not contain fatty acids: cholesterol, terpenes, cofactors for enzymes, etc. Lipi...