Experiments
Freezing & Melting
Condensation
Evaporation
100
What is the first step in the scientific method?
Ask a question/ State a purpose
100
For matter to freeze, does temperature need to increase or decrease?
decrease
100
Condensation occurs when a gas changes into a _______.
liquid
100
Evaporation happens when a _________ changes into a gas.
liquid
200
Why should you conduct an experiment more than one time?
To reduce the chance of errors in the results
200
Which is an example of melting? A. Clothes after removing them from the dryer B. Fog on the mirror after a shower C. Chocolate that has been sitting in the hot sun for an hour. D. A popsicle forming in the freezer
C.
200
Does condensation happen when you cool matter, or when you heat it?
cool
200
What do you call water in its gas state?
water vapour
300
What is a fair test?
When you change only one variable in an experiment at a time
300
What temperature does ice melt at?
above freezing (0 Celsius)
300
Explain why the bathroom mirror is foggy after a hot shower:
Some of the hot water from the shower begins to evaporate. When the water vapor spreads out and touches the mirror, it changes back into a liquid because the mirror was colder than the vapor.
300
On his test, Mike wrote that evaporation was happens when you cool a liquid and it changes into a gas. What was wrong with his answer
Cooling a liquid does not cause evaporation
400
What are 3 components of a good conclusion?
1. Restate your hypothesis and whether or not your results support it 2. Describe what you learned 3. What errors were made & how the experiment could be improved 4. A new experiment that could continue the study of the topic
400
What are the definitions of "melting" and "freezing"?
Melting: When matter changes from a solid to a liquid from increased heat. Freezing: When matter changes from a liquid to a solid from decreased temperature.
400
Explain why water vapor does not condense inside your lungs?
Because your body is warm inside (37 degrees). What vapor does not condense until it is cooled.
400
What are the three ways to make water evaporate faster?
larger surface area, wind, and heat
500
Why should you only test one variable at a time in an experiment?
If you compared more than one variable, you would not be able to tell which variable changed the data
500
My ice cream started to melt after sitting in the sun. Describe what happened to the particles when it changed from a solid into a liquid.
The particles gained energy from the sun and break apart. The particles are now spread further apart and can move around slowly.
500
Explain one example of condensation in your life and the phase change it goes though.
When gas changes to liquid. The gas is cooled so its particles slow down and loose energy. (morning dew on the grass, foggy window after washing dishes, foggy mirror in bathroom, drops of water the lid of a pot, beads of water on a cold glass,
500
Why can you smell perfume when you are near someone wearing it?
The perfume turns into a gas when it evaporates and mixes with the air around it. You can smell the perfume when the gas reaches your nose.
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