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Unit 3 States of Matter, Question 3.6, 3.1 Evaporation, 3.3 Investigating…
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Question 3.6
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C: Rain, snow and hail bring water back to the Earth's surface.
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6: Because it enables the availability of water for all living organisms and regulates weather pattern on our planet
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3.1 Evaporation
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When water or other liquids become warm enough, they change into gas. Water changes into gas called water vapour. When liquids change into gases we say they evaporate.
Evaporation happens because some particles in the liquid gain heat energy. The heated particles start to move faster and move further apart. Eventually the heated particles move so far apart that they escape from the surface of the liquid into the surrounding air.
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Water can evaporate with the help of heat. Changes in temperature can increase or decrease how fast water evaporates.
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Question 3.7b
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B:Water will do not always boil at 100°C because air pressure and dissolve material will affect the boiling point.
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B: When water is heated, the heat energy is transferred to the water particles. The water particles had too much energy to stay connected as a liquid and they are formed by water vapor.
3: The temperature will not increase and stay constant because the heat is absorbed by water particles.
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Question 3.9
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1: Why do you think scienctists needed to invent a temperature scale, instead of just deciding if things were hot or cold?
Because temperature is a relative measurement scales based on reference points must be used to accurately measure temperature.
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3.3b
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C) When water or other liquids become warm enough, they change into gas.
A) Yes, the amount of water has gone down in the containers.
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B) The bigger the surface area, the more the water goes down.
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The test was fair because, each containers has 100ml water.
Question 3.5
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The water in the open glass gained heat and evaporated to form water vapour. In the closed glass water vapour cooled and condensed to form water droplets on the plastic wrap.
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Question 3.8
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A: The temperature of the melted ice will increase after 20 minutes because the ice melt into water and the water will absorb heat.
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4: while water is freezing or melting, its temperature is not changing and remain on 0°C during the entire melting or freezing process. when matter is transitioning from solid to liquid (melting) or liquid to solid (freezing), its temperature is fixed at the melting/freezing point, which is the same temperature.
Question 3.1
2: The glass at the warm place has the water and the glass at the cool place would have more water. Because the one at the warm place is gonna have less liquid because of heat.
1: No because, After 2 days the 1 glass of water would be evaporated because of the heat of the sun.
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Questions
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Instant coffee, powdered milk and instant ramen.
During milk powder manafacture, the water is removed by boiling the milk under reducted pressure at low pressure in a process known as evaporation. The resulting concertrated milk is then sprayed in a fine mist into hot air to remove further moisture and to form a powder.
1: The hair dryer dries your hair by speeding up the evaporation of water from the hair's surface. The hot air emitted from a hair dryer increases the temperature of the air surrounding each strand of hair. The airflow from the hair dryer also increases how fast the water evaporates.
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When a material melts, it changes from a solid to a liquid. We can show how melting happens like this:
solid + heat -> liquid
When solids are heated, their particles gain energy and start to move more quickly and pull further apart. If the particles gain enough energy, they escape from the solid and change into a liquid.
The temperature at which a solid melts is called it's melting point. Different solids have different melting points.
As the solid ice melts, it changes to a liquid.
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The filament in this lightbulb is made of tungsten. Tungsten is a very hard metal. It has a melting point of 3380°C.
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Evaporation from seas, lakes and soil.
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water flows back to rivers, seas and lakes and soil
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Sea water is a solution. The salt is the solute and the water is the solvent. The salt dissolves in the water to make the solution
If the surface is cold enough, the water vapour gas changes to drops of liquid water. The process is called condensation. It is the reverse of evaporation. Condensation happens because the particles of a gas lose energy when they get cooler. This makes them slow down and move closer together forming a liquid.
When a liquid boils it changes into gas. The particles of the liquid gain heat and move much more quickly. Some of the heated particles move so far apart that they escape from the surface of the liquid and become a gas.
Water changes into steam when it boils. Steam is heated water vapour.
When a liquid gets hot enough to boil we say it has reached it's boiling point. Different liquids have different boiling points. How hot is water's boiling point? It's 100°degrees celsius.
while water is freezing or melting, its temperature is not changing and remain on 0 ∘C during the entire melting or freezing process. when matter is transitioning from solid to liquid (melting) or liquid to solid (freezing), its temperature is fixed at the melting/freezing point, which is the same temperature.
In the Celsius scale the freezing and boiling points of water are 100 units (or degrees Celsius) apart