Definitions
What is chemical energy?
The energy stored in chemical bonds
What type of reaction is 2H2 + O2 -> 2H2O?
Synthesis reaction
What does a formula for a molecular compound describe?
The type of element and number of atoms for each element
This reaction releases energy
Exothermic
If two’s company, and three’s a crowd, what are four and five?
Nine
What are compounds made of only two elements called?
Binary compounds
What type of reaction is 2H2O -> 2H2 + O2?
Decomposition
Where do you find the information you need to write a chemical formula?
Periodic Table
This reaction absorbs energy
Endothermic
What is so fragile that saying its name breaks it?
Silence
What is a chemical reaction in which a substance reacts rapidly with oxygen, often producing heat and light?
Combustion reaction
What does a combustion reaction require?
Oxygen and a spark
If the atomic symbol of P is Phosphorus and Cl is Chlorine, what is the name of PCl3?
Phosphorus trichloride
Does an exothermic reaction create energy? Why?
No, it was present in the chemical bonds
What starts with an ‘e’ and ends with an ‘e’ but only has one letter in it?
An envelope
What is a chemical reaction in which a compound breaks down into two or more simpler substances?
Decomposition reaction
On which side are reactants and products in a chemical equation?
Reactants: left, products: right.
What is the chemical formula of Sodium Sulfide? (Sodium: Na, Group 1A; Sulfur: S, Group 6A)
Na2S
On what side of a reaction equation energy appear in an endothermic reaction?
On the left with the reactants.
What has cities, but no houses; forests, but no trees; rivers, but no water?
A map
What is a chemical reaction in which two or more substances form a single compound?
Synthesis reaction
What happens to the chemical bonds of reactants and products in a chemical reaction?
Reactants: break, products: form.
What does a formula for an ionic compound describe?
The ratio of ions in the compound
What chemical reactions do not release or absorb energy?
None – all reactions either release or absorb energy.
I am not alive, but I grow; I don’t have lungs, but I need air; I don’t have a mouth, but water kills me. What am I?
A fire