Chemical reactions and enzymes Energy in reactants Atoms Elements Chemical bonds
200
What is a chemical reaction?
A process that changes, or transformes one set of chemicals into another.
200
What is energy?
Chemical reactions that absorb ____ will not occur without a source of energy.
200
What are atoms
The basic unit of matter.
200
What is an element?
A pure substance that consists entirely of a atom.
200
What are ionic bonds and covelant bonds?
The main types of chemical bonds.
400
What are reactants?
The elements or compounds produced by chemical reaction.
400
What is heat?
The energy is released in the form of.
400
What are protons, neutrons, and electrons?
The three subatomic particles that make up a atom.
400
What is an isotope?
Atoms of the same elemetthat differ in the number of neutrons and electrons they contain.
400
What is a ionic bond?
This formed then one or more elecrons are transferred from one atom to another.
600
What is a product?
The element or product produced by a chemical reaction.
600
What is activation energy?
The energy that is needed to get the reaction started.
600
What is a proton?
A positively charged particle.
600
What is a neutron?
A particle that has no charge.
600
What is a covelant bond?
This is formed when atoms of elements share electrons.
800
What are chemical bonds?
Chemical reactions involve changes in the ____ that joins atom in compounds.
800
What role do enzymes play in living things?
Enzymes speed up chemical reactions that take place in cells.
800
What is a electron?
A negatively charged particle.
800
What are chemical compounds?
A substance formed by the chemical combination of two or more elements in definite
800
What is an ion?
When an atom steals an electron from another atom.
What is carbon dioxide?
An important chemical reaction in your bloodstream that enables _____ to be removed from the body.
What are substrates?
The reactants of enzyme- catalyzed reactions.
Who is Democritus?
The Greek philosopher who came up with the concept of the atom.
What is water?
This contains two atoms of hydrogen, for each atom of oxygen, has the chemical formula od H2O.
What is a molecule?
The smallest unit of compounds.






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