1. Distinguish between physical/chemical properties and changes.
1. Distinguish between physical/chemical properties and changes.
Physical and Chemical Changes Worksheet 1. Name two indications that a chemical change has occurred. _______________________________________________ 2. What is the difference between a physical and a chemical change? _______________________________________________ 3. A sheet of paper is torn in half. Another sheet of paper is burned. A third sheet of paper is crumpled into a ball. a. What kind of change has each sheet of paper undergone? torn ________ burned _________ crumpled _________ b. In which sheet(s) of paper have the molecules changed? _________________________________________________ c. In which sheet(s) of paper have the molecules not changed? _________________________________________________
4. Classify each example as a physical change or a chemical change. Give one piece of evidence for each classification.
example penny flattened by a hammer rusting metal glass of juice frozen, melted, and refrozen chewing a cookie breaking a tooth cooking an egg
kind of change
evidence
2. Perform atom inventories to break matter into their substituent parts.
Atom inventory Look at the information available in a chemical equation:
Nitrogen gas
+
hydrogen gas
ammonia gas
First, complete an “atom inventory” of this chemical equation:
2 N atoms
6 H atoms
2 N atoms and 6 H atoms
**Note that the total number of atoms of N (nitrogen) and H (hydrogen) remains unchanged during this chemical reaction.
1. Look at the information available in a skeleton chemical equation:
methane gas
+
oxygen gas
water
+
a) Identify each substance as either a COMPOUND or an ELEMENT:
b) Complete an “atom inventory” for each of the substances. (see above example)
carbon dioxide
2. Here is a visual model of certain substances. Let CH4 be represented by: and CO2 be represented by:
a) Identify each molecule as either a COMPOUND or an ELEMENT: CH4:
O2:
CO2 (carbon dioxide): H2O (water):
b) Complete an “atom inventory” for each substance listed on a. (see above example)
3. Consider the following skeleton chemical reaction showing the formation of rust: Fe iron
+
O2 oxygen gas
Fe2O3 iron oxide
a) Provide a visual model of each substance.
b) Identify each substance as a COMPOUND or an ELEMENT. Fe:
O2:
c) Complete an “atom inventory” for each substance.
Fe2O3:
3. Use the periodic table to translate between element names and their given symbols
Chemical Names and Symbols Give the chemical names or symbols for the following elements: ___________ H
___________ aluminum
___________ Mg
___________ sodium
___________ Pb
___________ iron
___________Si
___________ potassium
___________ F
___________ phosphorus
___________ Sn
___________ bromine
___________ Cu
___________ nitrogen
___________ Ca
___________ mercury
___________ N
___________ lead
___________ Fe
___________ carbon
4. Classify elements as metals, nonmetal, metalloids by their properties and location on the periodic table.
Periodic Table Organizing Worksheet 3) Classify each property below as a characteristic of: METALS, NONMETALS, or METALLOIDS. A) Shiny in appearance. B) Does not react with acids. C) Shatters easily. D) Dull in appearance but electrically conductive. E) Reacts well with copper (II) chloride (CuCl2). F) Malleable. G) Tend to lose electrons to form positive ions (cations). H) Tend to gain electrons to form negative ions (anions). 4) Classify each element below as a METAL, NONMETAL, or METALLOID. A) tungsten
E) antimony
B) krypton
F) sodium
C) iridium
G) plutonium
D) sulfur
H) arsenic
5) What would you expect to happen if you hit a sample of each of these elements with a hammer? (i.e. will it shatter or be malleable?) A) iodine: B) zirconium: C) phosphorus: D) nickel: E) osmium: 6) What properties make nonmetals unsuitable for electrical wiring?
Physical and Chemical Changes Worksheet 1. Name two indications that a chemical change has occurred. _______________________________________________ 2. What is the difference between a physical and a chemical change? _______________________________________________ 3. A sheet of paper is torn in half. Another sheet of paper is burned. A third sheet of paper is crumpled into a ball. a. What kind of change has each sheet of paper undergone? torn ________ burned _________ crumpled _________ b. In which sheet(s) of paper have the molecules changed? _________________________________________________ c. In which sheet(s) of paper have the molecules not changed? _________________________________________________
4. Classify each example as a physical change or a chemical change. Give one piece of evidence for each classification.
example penny flattened by a hammer rusting metal glass of juice frozen, melted, and refrozen chewing a cookie breaking a tooth cooking an egg
kind of change
evidence
2. Perform atom inventories to break matter into their substituent parts.
Atom inventory Look at the information available in a chemical equation:
Nitrogen gas
+
hydrogen gas
ammonia gas
First, complete an “atom inventory” of this chemical equation:
2 N atoms
6 H atoms
2 N atoms and 6 H atoms
**Note that the total number of atoms of N (nitrogen) and H (hydrogen) remains unchanged during this chemical reaction.
1. Look at the information available in a skeleton chemical equation:
methane gas
+
oxygen gas
water
+
a) Identify each substance as either a COMPOUND or an ELEMENT:
b) Complete an “atom inventory” for each of the substances. (see above example)
carbon dioxide
2. Here is a visual model of certain substances. Let CH4 be represented by: and CO2 be represented by:
a) Identify each molecule as either a COMPOUND or an ELEMENT: CH4:
O2:
CO2 (carbon dioxide): H2O (water):
b) Complete an “atom inventory” for each substance listed on a. (see above example)
3. Consider the following skeleton chemical reaction showing the formation of rust: Fe iron
+
O2 oxygen gas
Fe2O3 iron oxide
a) Provide a visual model of each substance.
b) Identify each substance as a COMPOUND or an ELEMENT. Fe:
O2:
c) Complete an “atom inventory” for each substance.
Fe2O3:
3. Use the periodic table to translate between element names and their given symbols
Chemical Names and Symbols Give the chemical names or symbols for the following elements: ___________ H
___________ aluminum
___________ Mg
___________ sodium
___________ Pb
___________ iron
___________Si
___________ potassium
___________ F
___________ phosphorus
___________ Sn
___________ bromine
___________ Cu
___________ nitrogen
___________ Ca
___________ mercury
___________ N
___________ lead
___________ Fe
___________ carbon
4. Classify elements as metals, nonmetal, metalloids by their properties and location on the periodic table.
Periodic Table Organizing Worksheet 3) Classify each property below as a characteristic of: METALS, NONMETALS, or METALLOIDS. A) Shiny in appearance. B) Does not react with acids. C) Shatters easily. D) Dull in appearance but electrically conductive. E) Reacts well with copper (II) chloride (CuCl2). F) Malleable. G) Tend to lose electrons to form positive ions (cations). H) Tend to gain electrons to form negative ions (anions). 4) Classify each element below as a METAL, NONMETAL, or METALLOID. A) tungsten
E) antimony
B) krypton
F) sodium
C) iridium
G) plutonium
D) sulfur
H) arsenic
5) What would you expect to happen if you hit a sample of each of these elements with a hammer? (i.e. will it shatter or be malleable?) A) iodine: B) zirconium: C) phosphorus: D) nickel: E) osmium: 6) What properties make nonmetals unsuitable for electrical wiring?
