اختبار الكيمياء العامة (مادة 1)

Nitrogen is the most abundant gas in the Earth's atmosphere, making up about 78% of its composition. It is essential for life and plays a crucial role in the processes of plant growth and animal respiration.

Water is composed of two elements: hydrogen and oxygen. They combine in a ratio of 2:1 to form a single water molecule (H2O).

Increased levels of carbon dioxide in the atmosphere trap more heat from the sun, leading to a gradual warming of the Earth's climate. This phenomenon is known as global warming.

Burning a candle is a chemical reaction that involves the combination of a fuel (wax) with oxygen in the air. This reaction produces heat and light as the wax molecules break down and release energy.

Rising sea levels due to climate change can increase the frequency and intensity of tides, causing higher high tides and lower low tides. This can lead to more severe flooding in coastal areas.