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The polarity of the water molecule and its resulting hydrogen bonding make water a unique substance with special properties that are intimately tied to the processes of life. Life originally evolved in a watery environment, and most of an organism’s cellular chemistry and metabolism occur inside the watery contents of the cell’s cytoplasm.
- Water- a Vital Compound
Each water molecule attracts other water molecules because...
- Acids and Bases
An ion is an electrically charged atom or molecule. The...
- Water- a Vital Compound
The polarity of the water molecule and its resulting hydrogen bonding make water a unique substance with special properties that are intimately tied to the processes of life. Life originally evolved in a watery environment, and most of an organism’s cellular chemistry and metabolism occur inside the watery contents of the cell’s cytoplasm.
The hydrogen bonds in water allow it to absorb and release heat energy more slowly than many other substances. Temperature is a measure of the motion (kinetic energy) of molecules. As the motion increases, energy is higher and thus temperature is higher. Water absorbs a great deal of energy before its temperature rises.
The hydrogen bonds in water allow it to absorb and release heat energy more slowly than many other substances. Temperature is a measure of the motion (kinetic energy) of molecules. As the motion increases, energy is higher and thus temperature is higher. Water absorbs a great deal of energy before its temperature rises.
- Charles Molnar, Jane Gair
- 2015
- What Is Water?
- Water, Ice, and Steam
- Why Does Water Make Pressure?
- Why Does Water Expand When It freezes?
- Why Does Water Take So Long to Heat Up?
- Why Can Insects Walk on Water?
- How Does Water Climb Up A Tube?
We can answer that question in many different ways. Water is whatwets windows when it rains, what we drink when we feel thirsty, andwhat covers about 70% of Earth's surface. But what exactly is it? Chemically speaking, water is a liquid substance made ofmolecules—a single, large drop of waterweighing 0.1g contains about 3 billion trillion (3,000,00...
One of the unique things about water in the world around us is thatit exists in three very different forms (or states of matteras they are known): solid, liquid, and gas. Ordinary, liquid water is the most familiar tous because water is a liquid under everyday conditions, but we're alsovery familiar with solid water (ice) and gaseous water (steam a...
If you've ever found yourself washing a car with buckets or wateringa garden with cans, you'll have noticed just how heavy water can be.That's because it's a relatively densesubstance (it packsan awful lot of mass into a relatively small space). Water isn'tdense compared to metals such as gold, which is almost 20 times heavierby volume. But it's mu...
Everyone knows things get bigger when they get hotter and shrinkwhen they cool. Thermometers tell the temperature that way because the(liquid) mercury metal inside them expands as it heats up and contractswhen it cools down. But water is different. Almost uniquely, waterexpands as it starts to freeze! This amazing trick is called the anomalousexpan...
Has that kettle boiled yet? Well tell it to hurry up—I'm dying for acup of tea! It may be a nuisance if you're cooking or making drinks,but the length of time it takes water to absorb heat is very useful tous in other ways. Water has a high specific heatcapacity and that means it can hold or carry more heat per kilogram (or pound) thanvirtually any...
Artwork: Water striders and similar insects float using long, water-repellent (hydrophobic) legs to spread their weight over a large surface area. You've probably seen insects that can walk on water. They'resupported by a kind of invisible "structure" on the surface known as surfacetension. It happens because water molecules attract verystronglyto ...
Artwork: Water (left) climbs up the sides of a tube to form a downward-curving surfacecalled a concave meniscus. Liquid mercury (right) does the opposite, forming an upward-curving (outward-bulging) convex meniscus. Put some water in a glass and you'll see that it doesn't form aperfectly straight surface: it actually climbs up the glass slightlymor...
The hydrogen bonds in water allow it to absorb and release heat energy more slowly than many other substances. Temperature is a measure of the motion (kinetic energy) of molecules. As the motion increases, energy is higher and thus temperature is higher. Water absorbs a great deal of energy before its temperature rises.
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The partially negative charge of the water molecule’s oxygen surrounds the positively charged sodium ion. The hydrogen's partially positive charge on the water molecule surrounds the negatively charged chloride ion. Figure 2.15 When we mix table salt (NaCl) in water, it forms spheres of hydration around the ions.
