Exams & Certification

The molecular weight of ethanol (C2H5OH) is 46.1 and the density of absolute (100%) ethanol = 0.79 g/mL. a) Calculate the molarity of absolute ethanol (100% ethanol). b) The legal limit for a driver’s blood alcohol in Australia is 50 mg of ethanol per 100 mL of blood (referred to as a blood alcohol content […]

Schematic room temperature microstructures for four iron-carbon alloys are shown below. Rank these alloy microstructures (by letter) from most ductile to the least ductile. Note: (C) has a spheroidite microstructure. Fe3C Fe3C ? Fe3C ? ? ? Fe3C (B) (A) a) C>D>B>A b) C>D>A> B c) C>B>A>D d) C>A>B>D e) None of the above. Fe3C

A section of the iron-carbon diagram is shown in figure Q4a. Draw clearly labelled sketches of the microstructures you would expect to see at the following compositions and temperatures: i. 0.25 wt%C at just below eutectoid temperature ii. 0.76 wt%C at just above eutectoid temperature iii. 1.3 wt%C at just below eutectoid temperature [5 marks]

Which of the following is the best example of positive peer pressure? The Correct Answer and Explanation is: The best example of positive peer pressure is when a group of friends encourages one another to study for an important exam together. Peer pressure often carries a negative connotation, but it can also have a positive

What is the Lewis dot structure for Br2CNH? The Correct Answer and Explanation is: The Lewis dot structure for Br2CNH can be drawn by following these steps: Step 1: Count the Valence Electrons Total valence electrons:14 (from Br) + 4 (from C) + 5 (from N) + 1 (from H) = 24 valence electrons. Step

H2P-Br2 What is the electron dot structure The Correct Answer and Explanation is: The electron dot structure for the molecule H₂P-Br₂ (which I assume refers to dihydrogen phosphine dibromide) involves understanding the bonding between hydrogen (H), phosphorus (P), and bromine (Br). Here’s how to draw it and explain the bonding: Step-by-Step Process: Electron Dot Structure:

Methanol CH;OH (1 point) Total Number of Valence Electrons 14 Central Atom 1 Central Atom 2 of Electron Sets Geometry of Electron Sets Bonding Electron Sets Non- Bonding Electron Sets Molecular Shape Bond Angle Bond Polarity (for each unique bond present) Molecular Polarity answen Answer Answer Answer Answer Answer Answer Answer Answer Answer Answer Answer

The molecules have only London dispersion forces. More information is needed to answer the question. The molecules can form three hydrogen bonds. The molecules can form one hydrogen bond.Methylamine, CHNH: The molecules can form two hydrogen bonds. The molecules have only London dispersion forces. More information is needed to answer the question. The molecules can

? CH3NH2 CH3-O-CH3 CH3CH2OH CH3CH2F Both CH3CH2F and CH3CH2OH The Correct Answer and Explanation is: The correct answer is CH3NH2, CH3CH2OH. Explanation: Hydrogen bonding occurs when a hydrogen atom is covalently bonded to a highly electronegative atom, such as oxygen, nitrogen, or fluorine, and is in close proximity to another electronegative atom with a lone

Which of the following substances will have hydrogen bonds between molecules? CH3NH2 CH3-O-CH3 CH3CH2OH CH3CH2F Both CH3CH2F and CH3CH2OH The Correct Answer and Explanation is: The correct answer is CH3NH2 (methylamine) and CH3CH2OH (ethanol). Explanation: Hydrogen bonding occurs when hydrogen is bonded to a highly electronegative atom like fluorine (F), oxygen (O), or nitrogen (N),