Concept Check
What is an example of a physical change?
boiling water, dissolving solids, melting liquids
Name the following compound: LiF. Why is it an ionic compound?
Lithium Fluoride It is an ionic compound because the first part of the name is a metal ion whereas the second part of the name is a non-metal ion.
Name the following compound: CO2. Why is it a covalent compound?
Carbon dioxide. It is a molecular compound because both elements are non-metals.
What are two ways to tell that a chemical reaction has occurred?
1) change in temperature 2) change in color (products is different color from reactants) 3) gas is formed (bubbles) 4) precipitate is formed (solid substance when two clear solutions are mixed)
Name the diatomic elements. (Hint: "7 deadly diatomic")
1) hydrogen 2) nitrogen 3) oxygen 4) fluorine 5) chlorine 6) bromine 7) iodine
What is the term used for substances that are created by a chemical reaction?
Products
Write the chemical formula for calcium chloride.
CaCl2
Quick learning check: What is the difference between an ionic compound and a covalent compound?
Ionic compounds= a metal ion and a non-metal. Covalent compounds= both elements are non-metals.
Predict whether a chemical reaction has occurred for the following process: Frying chicken. If yes, state the evidence.
Yes. Evidence: odor, change in color
Write the following word equation as a balanced chemical formula: sodium chloride ----> sodium + chlorine
2NaCl ----> 2Na + Cl2
Identify the information listed for the element Li:
a) symbol b) atomic number c) number of protons d) number of electrons
a) Li b) 3 c) 3 d) 3
Write the chemical formula of aluminum oxide.
Al2O3
Write the chemical formula of sulfur trioxide
SO3
What type of reaction is this?
Cu + AgNO3 ----> Ag + CuNO3
Single displacement reaction
Balance the following equation:
___ K + ___ Br2 ----> ___ KBr
2 K + Br2 ----> 2 KBr
What is the NFPA diamond and what does NFPA stand for?
NFPA (National Fire Protection Association) provides information about how to store, handle and dispose of chemical substances.
Name the following compound: KBr
Potassium bromide
Write the chemical formula for carbon tetrachloride.
CCl4
What type of chemical reaction is this?
2H2O ----> 2H2 + O2
Decomposition reaction
Balance the following chemical equation:
___ S + ___ O2 ----> ___ SO3
2 S + 3O2 ----> 2 SO3
Identify the elements that make up the compound Na3PO4. How many atoms of each element are there?
Elements: Sodium (Na) and Phosphate (P) and Oxygen (O). There is 3 sodiums, 1 phosphate and 4 oxygens.
Write the chemical formula of potassium sulfide.
K2S
Name the following compound: NO. What type of bond is it?
Nitrogen monoxide. Yes it is a covalent bond because both nitrogen (N) and oxygen (O) are non-metals.
How can you turn NaCl ----> Na + Cl (a decomposition reaction) into a synthesis reaction?
Flip it. Na + Cl ----> NaCl
Balance the following chemical equation:
___ As + ___ O2 ----> ___ As2O5
What type of reaction is this?
4 As + 5 O2 ----> 2 As2O5 This is a synthesis reaction.