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WorksheetsWater, the amazing molecule
Total questions: 10
Worksheet time: 26mins
How many elements made the water molecule?
2.5
3
2
4
Why do we say that water is a polar molecule?
Because is from the North Pole, so is polar
The Oxygen side of the molecule is slightly negative, and the Hydrogen part is slightly positive
Polarity refers to the same charges that repel
The electrons are positive and the protons are negative
What is the charge of a proton and where is located in the atom?
Negative, around the nucleus of the atom
Positive and is part of the nucleus of the atom
Negative is inside the nucleus of the atom
Positive, around the nucleus of the atom
It is important to understand that Oxygen in the water molecule gets more electrons (-), and hydrogen gets less electrons so it is (+). In one word this refers to what property of water?:
Negativity
Positivism
Polarity
Neutrality
What is a covalent bond?
Covalent means that the electrons are shared between 2 or more atoms
Covalent means that the water molecule is ionic
Covalent means that a compound is neutral
What is the name of the bond (or attraction) of one water molecule to another and is responsible for the water surface tension?
Covalent bond
Adhesion
Hydrogen bond
Cohesion
What is cohesion?
Choose all the answers you think are right
Union or close relationship between people or things
The union between the water molecules, due to the polarity of the water molecules
when water molecules stick to each other
When water molecules adhere to other substances
EXPERIMENT:
The hydrogen bonds between millions of water molecules create the surface tension. Some insects and objects kind of float, do not break the water surface tension, others just sink.
1.Take a glass and fill it with water
2. Take at least 5 paper clips.
3. Try to make the paper clip float, if you can...
You only have 5 attempts.
EXPLAIN: Why the paper clips sink or float?
Advice: put the paper clip gently over the water
EXTRA POINTS:
Explain with your own scientific words, why we sweat?
How many atoms form the molecule of water or H2O?
3.5
4
3
2
