Looking down at the Earth from space, you can get an idea of just how much water there is. In fact, around 71% of the Earth’s surface is covered in water. Oceans make up about 97% of the world’s water, but because this is salt water, we are unable to drink it without first removing the salts. That leaves us with just 3% of fresh water, meaning we rely on our rivers, lakes, ice and rain for this essential life liquid. What is water?Water is a molecule made up of two Hydrogen (H) atoms and one Oxygen (O) atom. Liquid water consists of polar molecules with hydrogen bonds between the molecules. When we say the word water, we usually imagine it as a liquid. But water is able to pass through all states of matter. This means it can be a gas (steam), a liquid (water) and a solid (ice). We can use words like gas, liquid or solid to describe water’s physical properties. We can also say water is clear and colourless. Clear means we can see through it, colourless means it has no colour of its own. These two terms are often confused but are, in fact different, from each other. For example, if you made a cup of tea (without milk) and looked at it, you would see that the tea was clear (because you could see through it) but brown. Why does water freeze and become ice?Molecules are constantly moving because they have energy. In a liquid form, water molecules have more energy than in a solid – they move around quickly, essentially bouncing off of one another. As the liquid cools down, the amount of potential energy is reduced and the molecules start to move slower. When the water temperature reaches around 0°C, the molecules stick together and form a solid – ice. Even in this solid stage, the molecules are still moving – we just can’t see it. There is one more thing needed for water to turn into ice – a crystal-seed. This is a small impurity from which an ice crystal will grow. The impurity may be another particle in the water, or it may be caused by the container that holds the water. This is why not all water freezes at 0°C. Under some conditions, water can get as cold as -40°C – a process called super cooling. This occurs in completely pure water and usually in a very smooth container. So water turning into ice is not as straight forward as just getting cold. Other things also affect water freezing, including dissolved solids, water density, pressure and movement (such as currents).
The water cycle involves water moving from one form to another, through the different Earth systems so that it is constantly being recycled. Activity ideasInvestigating sea water – in this activity, students investigate some of the properties of seawater. Water temperature – in this activity, students look at what happens when hot and cold water meet.
1.6 divided by 56? show solution plss ESSAY: Answer the question below."WHAT COLOR FROM THE RAINBOW WOULD REPRESENT YOUR PRESENT LIFESITUATION AND WHY?" A force of 1.6N acts on a body producing an acceleration 56m/s² What is the mass of the body? what is the temperature of air if the speed of sound is 351 m/s?[tex]what is \: the \: temperature \: of \: air \: if \: the \: speed \: of \: sound \ … based on your identified problem in learning task no.1, determine the dependent and controlled variable in your proposed testable or researchable prob … How many grams of NaCI are dissolved in 500.0g of 18.0% aqueous solutionPS: This is a post test so if you don't know the answer don't give me an answe … conert the following metric units of length, mass and capacty pa help po sa science hi do you no this question /write the six basic steps of a scientific method below inside th box 3. Given the blood types of the mother and the child, identify the possible blood type of the father. Mother's Blood Type A B AB O Father's Blood Type … What will be the final temperature of a 3L nitrogen gas initially exposed to a temperature of 10°C if the volume is increased to 10L assuming that the … why the scent of flowers travel faster at a warm room • One way to show the atomic mass AND atomic number• Another way to write an element symbol• Represents the number of protons in an element. Can you divide equation II by another factor and still have it be correct? A balloon contain 4L of air at a pressure of 1.5 atm. What pressure in torr must be applied to compress the air to a volume of 1L with no temperature … The volume of a gas is 17.5 mL at 48°C and 0.837 atm. What will the volume be at 10°C and 0.995 atm?Answer in units of mL. 10.8 g sample of compound containing only nitrogen and oxygen produced 4.2 g of nitrogen upon this composition.What is the empirical formula and molec … what is the melting point of milk? what is the melting point of cereal? What is meaning of chemistry |
Explain what is happening to the particles of water in ice as it turns to liquid
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