Physical/Chemical Change
Chemical Bonds
Chemical Equations
Chemical Reactions
Vocabulary
100
A change in matter that produces one or more new substances
Chemical change
100
A chemical bond formed when two atoms share electrons is called a(n)
Covalent bond
100
A chemical equation uses chemical formulas and other symbols to summarize a _________
Chemical reaction
100
A type of chemical reaction where a compound is broken down into simpler substances.
Decomposition reaction
100
An atom or group of atoms that have an electric charge
Ion
200
Tearing a sheet of aluminum foil is an example of a ______
Physical change
200
Electrons are ______ between atoms in an ionic bond.
Transferred
200
Balance this equation. HgO + Cl2 ----> HgCl + O2
2 HgO + Cl2 ----> 2 HgCl + O2
200
In one of the labs you did in class you took iron powder, mixed it with sulfur powder and held it over a flame. When you removed your test tube from the flame you were left with a new substance with new properties, iron sulfide. What type of chemical reaction took place?
Synthesis reaction
200
The process in which substances go through chemical changes that result in the formation of new substances.
Chemical reaction
300
True or False. A physical change never alters the form or appearance of a substance.
False
300
Given the chemical formula, determine if the compound is ionic or covalent. FeCl2
Ionic
300
When balancing chemical equations, why can't you change the subscripts?
It changes the chemical formula of a compound
300
Identify the type of chemical reaction. Na2S + 2 HCl ----> 2 NaCl + H2S
Double replacement
300
A characteristic of a substance that can be observed without changing the substance into another substance.
Physical property
400
Electrolysis (decomposition by electric current) of water is an example of a ______
Chemical change
400
Ms. Nicolai left an unmarked, white, solid substance laying around the classroom. To try and determine if the substance is an ionic or covalent compound, you hold it over a flame for a minute and notice the substance hasn't melted. Next, you test its electrical conductivity and observe a light bulb light up when an electric current is passed through a solution containing the substance. Is this an ionic or covalent compound?
Ionic compound
400
Balance this equation Al2O3 ----> Al + O2
2 Al2O3 ----> 4 Al + 3 O2
400
During a chemical reaction substances may do one of three things. They might...
Combine, break apart, or exchange parts
400
A combination of symbols that represent the ratio of elements in a compound.
Chemical formula
500
Water evaporating from the surface of the ocean is an example of a _____
Physical change
500
You're in a lab experimenting with a substance you think is a covalent compound. You hold the substance over a flame and it quickly begins to melt. Next, you run an electric current through a solution containing the substance and it doesn't conduct electricity. Describe one more test you could do to prove this a covalent compound.
Testing its volatility (odor) or testing its ability to dissolve in water
500
In the copper recovery lab we observed how iron (Fe) and copper sulfate (CuSO4) reacted to yield iron sulfate (FeSO4) and copper (Cu). Identify the reactants and the products from this reaction.
Reactants- iron and copper sulfate Products- iron sulfate and copper
500
Imagine you're sitting next to a friend in a movie theater. On the other side of the theater, you notice another one of your friends watching the movie by themselves. During the movie, the friend you're sitting with will not stop talking so you get up and move to the empty seat next to your friend that was sitting alone. What type of chemical reaction is this an example of?
Single replacement
500
A scientific principle which states that during a chemical reaction, matter is not created or destroyed.
Law of conservation of mass
M
e
n
u