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science module 4
na
20
Science
8th Grade
10/15/2009

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Term
Define electrosis?
Definition
Using electricity to break a molecule down to it's constituent elements.
Term
Are protons positive or negative?
Definition
positive.
Term
Are electrons positive or negative?
Definition
negative.
Term
What is a polar molecule?
Definition
A molecule that has slight positive and negative charges due to an imbalance in the way electrons are shared.
Term
What is a Solvant?
Definition
A liquid substance capable of dissolving other substances.
Term
What is a solute?
Definition
A substance that is dissolved in a solvent.
Term
What is cohesion?
Definition
The phenomenon that occurs when individual molecules are so strongly attracted to each other, even when exposed to tension.
Term
What is hard water?
Definition
Water that has certain dissolved ions in it, predominately calcium.
Term
If you did experiment 4.1 on hydrogen peroxide, who's chemical formula is H2O2. Would the results be same as water, equal amounts of hydrogen and oxygen, or twice as much oxygen as hydrogen.
Definition
Equal amounts of hydrogen and oxygen.
Term
If you did experiment 4.1 and the test tube that's holding the hydrogen has a crack in it, so some of the gas can leak out. What chemical formula would you have, HO or H4O?
Definition
It would be HO.
Term
The chemical formula of Epsom salts is MgSO4. If Mg is magnesium, S is sulfur, and O is oxygen, how many of each are in epsom salt.
Definition
1 magnesium, 1 sulfur, and 4 Oxygen.
Term
How many molecules are in NH3?
Definition
4
Term
A molecule is composed of atoms that all pull on electrons withe same strength. Will it be polar?
Definition
no.
Term
Which has more molecules a liter of water, or a liter of ice?
Definition
Water, but that is not so for substances other than ice.
Term
Baking soda dissolve in water. Will it dissolve in vegetable oil, which is a nonpolar substance?
Definition
Baking soda will not dissolve in vegetable oil.
Term
If a molecule has one calcium atom (Ca), one carbon atom (C), and three oxygen atoms (O), what is its chemical formula?
Definition
CaCO3
Term
Carbon tetrachloride will not dissolve in water. Is it made of ionic molecules, polar molecules, or nonpolar molecules?
Definition
nonpolar
Term
What is responsible for water being a liquid at room temperature as well as water's cohesion?
Definition
Hydrogen bonding is responsible.
Term
What causes surface tension.
Definition
Cohesion causes surface tension.
Term
Why is water harder in certain regions of the world than others?
Definition
Water is harder in certain regions of the world because there is a higher amount of calcium containing substances than others.
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