Notes, summaries, assignments, exams, and problems for Chemistry

Essential Chemical Elements List (H to Pu)

This reference table provides the names and corresponding atomic symbols for the first 94 chemical elements, starting with Hydrogen (H) up to Plutonium (Pu). This list is crucial for students and professionals needing quick access to fundamental chemical nomenclature.

• Lexeme: The abstract vocabulary item listed in the lexicon with a common core of meaning.
• Word-forms: Physical realizations of the lexeme.
• Paradigm: The list of word-forms that belong to a word.
• Morpheme: The smallest unit of analysis with semantic content or grammatical function that words are made up of.
• Morph: The physical realization of the morpheme. Morphs are made up of one or more morphemes.
• Syncretism: Identical word-forms that belong to the same lexeme but are different grammatical words.
• Root: The basic form that remains when you get rid of all the affixes.
• Stem: A term that we only use in inflectional morphology; it is the form to which you attach an inflectional affix (only suffixes in English).
• Base: Anything; any root and any stem are

Structure of the Atom

Protons, Electrons, and Neutrons

Protons: Equal to the atomic number

Electrons: Equal to the atomic number

Neutrons: Equal to the atomic mass minus the atomic number

Bohr-Rutherford Diagram

Electron shells: 2, 8, 8, 18, 18, 32

Counting Atoms

Example 1: Na₂CO₃

• Sodium (Na): 2
• Carbon (C): 1
• Oxygen (O): 3

Example 2: 4Al₂(CO₃)₃

• Aluminum (Al): 4 x 2 = 8
• Carbon (C): 3 x 4 = 12
• Oxygen (O): 9 x 4 = 36
• Total: 56

Ions and Ionic Compounds

Ions are atoms that have either lost or gained electrons. While atoms are neutral, ions are charged particles.

Ionic Compounds are a combination of a cation (positive ion) and an anion (negative ion), typically formed between a metal and a nonmetal.

Example: Calcium Chloride (CaCl₂)

Calcium (Ca⁺²) has a charge of +2,...

The Mole Concept

The mole concept is an International System unit of measurement for a substance. It is also represented by carbon-12, and 1 mole is equal to Avogadro's number (6.022 x 10^23).

The Periodic Table's Role in Stoichiometric Calculations

We use the periodic table to get values for given elements in a reaction to obtain their atomic values. We can then use these values for conversion from grams to moles or moles to grams in stoichiometric-based problems (gram/mole, mole-gram conversions).

Heat vs. Enthalpy

Heat is the energy that flows between a system and its surroundings due to a difference in temperature.

Enthalpy is equivalent to the total heat content of a system.

Why Only Enthalpy Explains Energy Associated with Chemical Bonds

Because...

The Four Primary Types of Semantic Change

1. Generalization (Broadening)

A word that originally had a specific meaning becomes more general.

• Pigeon: At first meaning just the young dove, it became more general, referring to all pigeons (or sometimes specifically male pigeons).
• Guy: An eponym derived from Guy Fawkes. It was first used for someone grotesque, but now generally means 'man' or 'fellow'.

2. Specification (Narrowing)

The opposite process of generalization, where a word's meaning becomes more specific.

• Meat: Old English (OE) mete referred to food in general. Now it specifically refers to animal flesh.
• Engine: Originally any mechanical device (from Latin ingenium, meaning innate quality or clever invention). Now it refers specifically to a

Copper Metallurgy: Pyrometallurgy vs. Hydrometallurgy

The metallurgy of copper depends on the mineral ore. Sulfide ores utilize a pyrometallurgical route to produce anodes or cathodes, while oxide ores use a hydrometallurgical route to directly produce cathodes.

Pyrometallurgy

The cathode production process via pyrometallurgy is as follows: Mineral → Smelting (furnace) → Converters → Refining anode casting → Refining → Cathode.

Copper sulfide ore, with a low grade of 0.5%, requires concentration by flotation. The copper concentrate received in the foundry industry undergoes melting in a furnace, where copper is recovered, and sulfur and iron are removed through oxidation. The copper settles at the bottom and exits the furnace as copper...

Module 1: Science and Education

1. What is Science?

Science is the organized knowledge of our physical world, which encompasses everything we perceive through our five senses.

2. What is the Physical World?

The physical world relates to everything we interact with using our five senses.

3. Pillars of Science

The pillars of science are observation and reasoning.

4. Modus Operandi of Science

1. Accumulation of observed facts and a detailed description of what has been witnessed.
2. Generalization of these facts into laws, which can be represented by formulas, verbal statements, or other means of summarizing the observed events.
3. Explanation of facts through hypotheses and theories.
4. Drawing inferences from these assumptions and comparing them with experimental

Recognition of Lipids

Laboratory Materials

• Test tubes
• Rack
• Glass rods
• Lighter
• Beakers
• Pipettes
• 20% NaOH solution
• Sudan III solution
• Red ink
• Ether, chloroform, or acetone
• Olive oil

2.1 Saponification

Basis

Hot fat reacts with sodium or potassium hydroxide, decomposing into two elements: glycerol and fatty acids. These ions combine with the hydroxide to produce soaps, which are sodium or potassium salts of fatty acids. In living organisms, the hydrolysis of triglycerides is facilitated by specific enzymes called lipases, which form fatty acids and glycerol.

Technique

1. Place 2ml of oil and 2ml of 20% NaOH in a test tube.
2. Shake vigorously and place the tube in a water bath for 20 to 30 minutes.
3. Afterward, three phases will be visible in the tube: a clear bottom layer

Ductility: Able to undergo change of form without breaking

·Malleability: capable of being shaped, as by Hammering or pressing:

·Density (give an Example): a measurement of how Tightly matter is crammed together. Example: Oil floats on vinegar because Its density is less.

• Chemical properties of matter (give an Example): Are any of the properties Of matter that may only be observed and measured by performing a chemical change or chemical Reaction. Example: oxidation states

·What is a physical Change (give an example): A usually reversible change in the physical 

properties of a substance,as size or shape. Example: When melting an ice cube.

·Difference between Chemical properties and physical properties (give an example)

Chapter 1 : Matter and change

Branches of chemistry

Organic Chemistry – the study of most carbon-containing compounds.

Inorganic Chemistry – the study of most non-carbon-containing compounds.

Physical Chemistry – the study of the properties and changes of matter and their relation to energy.

Biochemistry – the study of substances and processes occurring in living things.

Analytical Chemistry – the identification of the components and composition of materials.

Theoretical chemistry – the use of mathematics and computers to understand the principles behind observed chemical behaviour and to design and predict the properties of new compounds.

Matter

Atom – the smallest unit of an element that maintains the chemical identity of that element.