Chemical Bonding
What is a chemical bond?
A force that holds together the atoms in a compound.
How is a chemical reaction represented?
By a chemical equation.
Define law of conservation of mass.
Matter can not be created or destroyed, only changed or rearranged.
Which property of water means it has one end that is slightly positive, and one end that is slightly negative?
polar molecule/polarity
A solution is what kind of substance?
mixture
Define ionic bond.
An ionic bond is a bond formed when metals transfer valence electrons to nonmetals.
Food coloring added to water resulting in a color change is which type of change?
If 200 grams of sugar are mixed with 50 grams of sulfuric acid, solid carbon, along with water vapor and sulfur dioxide gases are produced. If both gases are trapped in the container, what will be the final mass of the products?
250 g.
How can sugar be separated from water in a solution?
Evaporation
What type of matter can be separated by physical means?
Define covalent bond.
A covalent bond forms when two nonmetals share valence electrons.
Why are iron rusting, wood burning, and pennies forming patinas all considered to be chemical reactions?
Because new substances are formed.
In a chemical reaction, the total mass of the reactants should equal what?
The total mass of the products
What property of water creates surface tension?
cohesion
A type of chemical reaction in which energy is released.
How are ions formed?
Ions are formed when an atom gains or loses valence electrons.
Why is formation of a precipitate an indicator of a chemical change?
(show video)
Because a precipitate is a solid formed from mixing two liquids. The precipitate is a new substance with properties different from the two liquids.
Balance the following equation:
NaClO3 --> NaCl + O2
2NaClO3 --> 2NaCl + 3O2
Which property of matter allows a drop of water to stick onto a plant leaf or a blade of grass?
If a chemical reaction occurs and the temperature of the products is lower than the temperature of the reactants, what type of reaction occured?
What type of bond is formed between Sulfur and Fluorine?
covalent
Why do many statues and monuments appear to be broken down over time?
Because acid rain chemically weathers statues and monuments.
Balance the following equation:
AgNO3 + K3PO4 --> Ag3PO4 +KNO3
3AgNO3 + K3PO4 --> Ag3PO4 + 3KNO3
Which property of water allows it to be the universal solvent?
Product side