Energy Changes in Reactions
The energy stored in chemical bonds
What is Chemical Energy
These are compounds made of only two elements
What are binary compounds.
A chemical reaction in which two or more substances react to form a single compound. s
What is a synthesis reaction.
What is the ratio of cations (metals) to anions (nonmetals) in the compound.
These substances undergo a chemical change.
What are reactants.
The energy required to start a reaction.
What is activation energy?
This is a chemical reaction that releases energy to its surroundings.
What is an exothermic reaction.
A chemical reaction in which a substance reacts rapidly with oxygen, often producing heat and light
What is a combustion reaction.
What is the name of MgCl2.
What is magnesium chloride.
These numbers appear before a formula in a chemical equation to show how many atoms or molecules of each reactant or product are involved in the reaction.
What are coefficients.
An amount of a substance that contains approximately 6.02x1023 particles of the substance.
What is a mole.
These are covalently bonded groups of atoms that have a positive or negative charge and act as a unit
What are polyatomic ions.
A chemical reaction lin which a compound breaks down into 2 or more simpler substances.
What is a decomposition reaction.
What is the name of NaOH.
What is Sodium Hydroxide.
This is a model of an atom in which each dot represents a valence electrons.
What is an electron dot diagram?
A measure of how strong the bond is. It requires a lot of energy to break this bond.
What is bond energy.
This is a chemical reaction that absorbs energy from its surroundings
What is an endothermic reaction.
AB + CD --> AD + CB
What is a double replacement reaction.
What is the formula for copper (I) sulfide.
What is Cu2S.
These bonds form between the partially positively charged hydrogen atoms of one water molecule and the partially negatively charged oxygen atoms of a nearby water molecule.
What is the law of conservation of energy?
These names identify the specific elements in the compounds and the formulas tell us the composition of the molecules.
What are molecular compounds.
2K + 2H2O --> H2 + 2KOH
What is a single replacement reaction.
What is the formula calcium chloride?
What is CaCl2.
Balance the equation CH4 + O2 --> CO2 + H2O.
CH4 + 2O2 --> CO2 + 2H2O