Notes, summaries, assignments, exams, and problems for Secondary education

Matter and Energy

Matter

• Atoms and molecules
• Everything that has mass and volume
• Law of Conservation of Matter: Matter is neither created nor destroyed, it only transforms.

Energy

• Light, chemical, and heat
• Ability to perform work
• Law of Conservation of Energy: Energy is neither created nor destroyed, it only transforms.
• Second Law of Thermodynamics: Entropy tends to increase in the universe.

Cycles of Matter

We can study matter by the path of the atoms and molecules that constitute it. We consider that each trophic level is a compartment, through which the atoms pass.

Energy Flows

• Energy passes from one level or compartment to another, through trophic networks.
• In each step, a significant part of energy is lost as heat or entropy.
• Energy cycles are not closed

Absolutism in Europe: The Rise of Authoritarian Monarchies

Beginning in the late 15th century, European monarchs began consolidating power, gradually wresting it from traditional sources of authority like the nobility, the Church, and city-states. This trend, known as the rise of authoritarian monarchies, continued throughout the 16th century.

The 17th Century: The Zenith of Absolute Rule

The 17th century witnessed the culmination of this power shift, with monarchs reaching the pinnacle of their authority. This period marked the emergence of absolutism, a political system where the king embodied the ultimate source and wielder of all political power.

Philosophical Justifications for Absolute Power

Several prominent thinkers sought to legitimize... Continue reading "Absolutism in Europe: From Authoritarian Monarchies to the Divine Right of Kings" »

The Harpsichord: A Precursor to the Piano

The harpsichord is a horizontally strung stringed keyboard instrument and a precursor of the piano. It is triangular in shape, consisting usually of two manuals controlling various sets of strings plucked by pivoted plectrums mounted on jacks. With horizontal strings which run perpendicular to the keyboard in a long tapering case, its sound features are gentle, metallic, and blurring.

The Baroque Flute and Its Construction

The baroque flute is made of wood, of which the most commonly used are boxwood, ebony, and grenadilla. It has a conical bore that is wide at the end with the embouchure hole and tapers to become significantly more narrow at the bottom. It has relatively small embouchure and finger holes.... Continue reading "Essential Baroque Musical Instruments and Their Sounds" »

Common Circulatory System Disorders

• Thrombosis: Occurs when a blood clot causes a blockage in a blood vessel, which can lead to a heart attack or stroke.
• Leukaemia: A type of cancer characterized by an excess of white blood cells.
• Anaemia: A condition where there are not enough red blood cells in the body.
• Arteriosclerosis: Occurs when artery walls become harder due to the buildup of fats and cholesterol.
• Atherosclerosis: When plaque on an artery wall prevents blood from flowing through the artery.
• Myocardial Infarction: Commonly known as a heart attack, caused by a blockage of blood flow in one of the heart's coronary arteries.
• Hemophilia: A hereditary, inherited condition where blood cannot clot properly because of a lack of blood-clotting proteins

Effective Complaint Letters & Emails

Dear ________________,

Introduction

Choose one of the following opening statements:

• I am writing to complain about _________________.
• I am writing this letter/email because I would like to take this opportunity to express my __________ / opinion about _________________________.
• I am writing / We are writing this email/letter to express my/our agreement / disagreement _____________.

Body

Use different paragraphs and linkers to connect your ideas. Consider using the following:

• First of all,
• Apart from that,
• As well as that,
• Moreover,
• So,
• It is important to mention that,
• Besides,
• According to,
• Whereas,
• In fact,
• However,
• Due to,
• On the other hand,
• Finally,
• That is to say,
• Concerning,
• What's more,
• For instance,
• For example,
• Such as…

Conclusion

Invertebrate Reproduction

Porifera (Sponges)

They perform both types of reproduction:

• Asexual Reproduction: A small piece of sponge breaks off, anchors to a surface, and regenerates into a complete organism.
• Sexual Reproduction: This requires two individuals of opposite sex. They form sexual cells (sperm and ovum) that join together and produce a larva. The larva then anchors to a surface and grows, forming a new individual.

Polyps

They reproduce both asexually and sexually:

• Asexual Reproduction: A small bud forms and remains attached as it grows. It separates from the parent organism only when mature and then anchors to a surface.
• Sexual Reproduction: This requires two individuals of opposite sex. They form sexual cells (sperm and ovum) that join

Government Economic Policies

1) Economic growth: the government will always want the economy to grow. They can encourage growth through helping private business to grow, through low business taxes or through government involvement in growth sectors such as new high tech industries.

2) Prices: the government will want to make sure that the general level of prices in the economy is effectively managed. Prices need to rise in a relatively slow and predictable way so that future contracts can be made where both sides know the value of what they pay or receive. Government policies to control inflation might include reducing spending or raising taxes when prices start to rise.

3) Income distribution: all economies are characterized by inequalities in... Continue reading "Government Economic Policies and Financial Instruments" »

Industrial Revolution Transformations (1780 Onward)

Agricultural Progress

• The triennial rotation was substituted by the Norfolk four-course system.
• The amount of livestock increased, leading to improved human nutrition.
• Spread of maize and potatoes enhanced food availability.
• The open field system was substituted by Enclosure Acts, turning common land into private property and reducing the number of peasants.

Demographic Revolution

This revolution grew in the 18th century. The main cause was the decrease in mortality thanks to improvements in nutrition and the decline in major epidemics. It was also a result of progress in urban hygiene and medicine. The birth rate remained high, increasing the available workforce and demand for products.

New Energy

Food Preservation Techniques

Traditional Preservation Methods (TT)

• Curing: Addition of salt to preserve food.
• Cooling: A process of removing heat to slow spoilage.
• Heating: Heating food to temperatures sufficient to kill microorganisms.
• Canning: Cooking food and sealing it in sterilized cans.
• Fermentation: The process of converting carbohydrates to alcohol or organic acids using microorganisms.

Industrial and Modern Techniques (MIT)

• Pasteurization: A process that kills microorganisms in food and drink using high temperatures.
• Vacuum Packing: A method of packaging that removes air from the package prior to sealing.
• Artificial Food Additives: Substances added to products to prevent decomposition.
• Biopreservation: The use of natural or controlled microorganisms