Evidence of Chemical Change
A change that alters the form or appearance of a substance without changing the substance itself is called what?
Physical Change
What type of reaction releases more energy than was required to break bonds resulting in the production of heat and light?
Exothermic Reaction
What symbol in a chemical equation is used to demonstrate that a chemical reaction occured
Arrow
What does the law of conservation of mass state?
Matter is neither created nor destroyed
Chemicals made by humans from natural resources are called what?
Synthetic Materials
A change that occurs when existing bonds break and new bonds form, creating a new substance, is called what?
Chemical Change
What type of reaction absorbs more energy than is produced when new bonds are formed, leaving the surroundings feeling cold?
Products
What type of reaction occurs when two or more elements or compounds combine to make a more complex substance?
Synthesis
A chain of repeating compounds is called what?
Polymer
When iron is placed in a blue copper sulfate solution, the iron and copper ions are switched so that the product becomes a green iron sulfate covered in reddish-brown copper deposits. What evidence is presented to show that a chemical reaction occurred?
Color Change
The minimum amount of energy needed to start a chemical reaction is called what?
Activation Energy
What is the name given to the chemicals before the chemical reaction has occurred? They appear on the left side of the chemical equation.
Reactants
What type of reaction occurs when compounds break down into smaller, similar products?
Decomposition
A molecule or compound that bonds with identical compounds to form a chain is called what?
Monomer
Yeast cells consume sugars that are in flour. In the process, the yeast produces alcohol and carbon dioxide gas and is altogether instrumental in the process of making bread rise. What evidence is presented to show that a chemical reaction occurred?
Production of a Gas
Catalyst
What is the name of the number that appears at the beginning of a chemical compound representing how many of that compound are present in the chemical equation?
Coefficient
What type of reaction occurs when one element or compound switches places with another element or compound?
Replacement
What is the most common type of synthetic polymer?
Plastic
When silver nitrate and potassium chloride are dissolved in water and mixed, the products are a solid silver chloride and a liquid potassium nitrate. What evidence is presented to show that a chemical reaction occurred?
Formation of a Precipitate
What are the four factors that affect the rate of chemical reactions?
What is the name of the number that appears after a given element in a chemical compound, representing how many of that element are in the compound?
Subscript
Which compound is missing from the following equation?
(NH4)2SO4 + _________ → 2NH4NO3 + BaSO4
Ba(NO3)2
Is nylon natural or synthetic?
Synthetic