Science helps us develop an understanding of our world built on current scientific theories. It teaches us a way of tackling problems to gain further knowledge. A scientific approach involves seeking out and critically examining the evidence for and against an idea. Science is about investigating the world around us. We do this to discover:

• why things happen, so we can predict how they will happen in the future

• what chemicals things are made of and how they will react

• why living things work in the way they do

Global Warming and Climate Change

• Issue: Rising global temperatures due to increased greenhouse gas emissions, primarily from human activity such as burning fossil fuels, deforestation, and industrial processes.

• Impacts: More frequent and severe weather events (heatwaves, floods, storms), rising sea levels, loss of biodiversity, disruptions to agriculture, and threats to ecosystems.

Pollution

• Issue: Air, water, and soil pollution from industrial waste, agriculture runoff, plastic waste, and vehicle emissions.

• Impacts: Health problems like respiratory diseases, cardiovascular diseases, contamination of drinking water, ecosystem destruction, and threats to biodiversity

Natural Disasters (Earthquakes, Tsunamis, Volcanoes)

• Earthquakes and Tsunamis:

  • Issue: Earthquakes trigger tsunamis. These natural disasters are unpredictable, but monitoring systems can provide warnings.

  • Impacts: Destruction of infrastructure, loss of life, displacement of communities, and long-term economic challenges.

• Volcanoes:

• Issue: Active volcanoes pose a threat to nearby populations, causing lava flows, ash clouds, and pyroclastic flows.

• Impacts: Damage to property, crops, air travel disruptions, and long-term health issues due to ash inhalation.

https://www.ck12.org/chemistry/scientific-measuring-devices/lesson/Scientific-Measuring-Devices-MS-PS/

• Parallax error occurs when the measurement of an object's length is more or less than the true length because of your eye being positioned at an angle to the measurement markings.

What is Meniscus?

• The meniscus of a liquid is the upward or downward curve seen at the top of a liquid in a container. The nature of curve whether upward (convex) or downward (concave) depends on the surface tension the liquid and its adhesion capacity to the wall of the container.

There are two main rules to follow.

1. Know what you are doing in the laboratory. Read the instructions carefully before you start.

2. Always think of others and behave sensibly.

Other important rules to remember are:

1. Do not enter the laboratory unless you are with your teacher.

2. Never touch equipment in the laboratory unless you are told to use it.

3. Don't eat in the laboratory.

4. Always walk - never run.

5. Wear protective clothing - especially safety glasses.

6. Never taste chemicals.

7. Don't use paper to light Bunsen burners, and don't put burning things in the rubbish bin.

8. Keep books, paper, long hair and clothing away from flames.

9. Always point test tubes away from people.

10. Check with your teacher on how to dispose of waste liquids and solids. Broken glass should be placed in a special bin.

11. If you spill something on your clothes wash it immediately with plenty of water. Tell you teacher.

12. Report all accidents and breakages to your teacher.

13. After heating equipment, let it cool down before picking it up. This will avoid burns.

14. Clean all equipment after use and put it back where you got it from. Clean your work bench if there is a spill and after doing experiments.

IF AN ACCIDENT DOES OCCUR, REPORT IT TO YOUR TEACHER.

Eye injuries can be caused by liquids splashing into your eyes during experiments. Always wear your safety glasses. Also never point a test tube towards your face or anyone else's.

Poisoning can be caused by breathing in fumes during an experiment, eating chemicals or by spilling them onto your skin. Do not eat or drink in the lab.

Cuts are caused by broken glass, so make sure any broken glass goes into the labelled bin.

Burns can be caused by touching hot equipment, or by spilling hot liquid when someone bumps you. Treat burns with cold running water. Serious burns can occur with a Bunsen burner. If this happens, tell your teacher at once.

Fires are always possible when using burners. It is essential to tie back long hair whenever you are using a burner.

Damage to clothing and skin can occur when chemicals especially corrosive liquids such as acids and alkalis, are spilt. If there is a spill, wash the area immediately with lots of water and send someone to tell the teacher. In the most serious cases you may need to use the safety shower.

Damage to the laboratory can occur when sinks become blocked with paper or solids, which can cause flooding if the taps are left running. The benches can also be scorched during heating. They can also be damaged by chemical spills, so wipe these up immediately.

Graphing 

•  Record data (Results table, calculating averages)

• Interpreting graphs graph data

Physical and chemical changes

 Identifying whether a reaction is chemical or physical involves observing changes in the properties of substances. A chemical change produces new substances, while a physical change only alters the form or appearance of a substance without changing its molecular composition. 

Key Observations of a Chemical Reaction

A chemical reaction is occurring if you observe one or more of the following indicators: 

• Production of Gas/Bubbles: The appearance of bubbles without heating indicates a new gas is being formed (e.g., vinegar and baking soda).

• Color Change: An unexpected or permanent change in color, not just a mixture of colors (e.g., rusting iron turning orange).

• Temperature Change: The reaction vessel gets hot (exothermic) or cold (endothermic) without external heating or cooling.

• Formation of a Precipitate: A solid forms when two clear liquids are mixed.

• Odor Change: A new, often pungent, smell is produced (e.g., milk souring).

• Release of Energy: Production of light, sound, or intense heat (e.g., fireworks).

• Irreversibility: The change cannot easily be undone (e.g., burning wood)

• Key Observations of a Physical Change

A physical change is occurring if you observe the following characteristics: 

• Change of State: Melting, freezing, boiling, or condensation (e.g., ice melting, water boiling).

• Change in Shape/Size: Cutting, breaking, grinding, or crushing (e.g., shredding paper, chopping wood).

• Dissolving: A solid dissolving in a liquid to form a mixture (e.g., salt in water).

• Reversibility: The substance can often be returned to its original state (e.g., freezing water back into ice). 

Tips for Observation

• Look for new substances: Ask yourself if the substance is fundamentally different now (e.g., burnt toast is not just crunchy bread; it is carbon).

• Consider reversibility: Can you get the original materials back easily? If yes, it is likely physical.

• Beware of mixtures: Mixing colored items is a physical change, but if they react to create a new color, it is chemical