Shared Flashcard Set

Details

Carolyn Bio Chapters 2 and 3
Chemistry and Molecules
52
Biology
9th Grade
09/13/2015

Additional Biology Flashcards

 


 

Cards

Term
Metabolism
Definition
The sum of all the chemical reactions that occur in your body.
Term
Matter
Definition
Anything that occupies space and has mass.
Term
Elements
Definition
Substance that cannot be broken down by chemical reactions
Term
How many naturally occurring elements are there?
Definition
92
Term
True or False. Everything is made up of matter.
Definition
True
Term
How many elements are essential to people?
Definition
25
Term
How many elements do plants need?
Definition
17
Term
Periodic Table of Elements
Definition
A table of all of the chemical elements, naturally occurring and synthetic.
Term
How are the elements ordered in the periodic table?
Definition
Elements are ordered by their atomic number.
Term
Atomic Number
Definition
Number of protons in the nucleus of an atom.
Term
Atomic Mass
Definition
The average mass of an atom of that element.
Term
Trace Elements
Definition
Elements that are required in very small amounts, but they are essential for life.
Term
Compounds
Definition
Substances that contain 2 or more elements in a fixed ratio.
Term
When elements combine, what do they form?
Definition
Compounds
Term
Mass
Definition
The amount of material in an object.
Term
Atom
Definition
basic building block of all matter.
Term
Subatomic particles
Definition
Particles that create an atom, such as electrons, neutrons, and protons
Term
Proton
Definition
Positively charged subatomic particle
Term
Electron
Definition
Negatively charged subatomic particle
Term
Neutron
Definition
Neutrally charged subatomic particle
Term
What happens when an atom has an equal number of protons and electrons?
Definition
The atom's electrical charge is zero and the atom is neutral.
Term
Atomic nucleus
Definition
Location of the neutrons and protons in an atom.
Term
Where are electrons located?
Definition
Around the nucleus.
Term
How many naturally occurring elements are used by a person's body?
Definition
28
Term
Which elements are the most abundant in living cells?
Definition
Oxygen, carbon, hydrogen, and nitrogen
Term
Isotope
Definition
forms of an element that differ in mass.
Term
Radioactive isotope
Definition
Isotope in which the nucleus decays spontaneously, shedding particles and energy.
Term
What is a consequence from exposure to a radioactive isotope?
Definition
Radiation from decaying isotopes can damage cellular molecules and thus pose serious health risks.
Term
By definition, all atoms of carbon have how many protons in their nucleus?
Definition
Six
Term
What changes between an element and its isotope?
Definition
The number of neutrons
Term
Chemical bond
Definition
An attractions between two atoms resulting from a sharing of outer-shell electrons or the presence of opposite charges on the atoms.
Term
What are the three types of chemical bonds?
Definition
Ionic, covalent, and hydrogen bonds.
Term
Ions
Definition
atoms that are electrically charged as a result of gaining or losing electrons.
Term
Ionic bond
Definition
Bond formed between oppositely charged ions.
Term
Ionic Compounds
Definition
Compounds held together by ionic bonds.
Term
The suffix -ide is used when?
Definition
It is used for ionic compounds.
Term
Covalent Bonds
Definition
An attraction between atoms that share one or more pairs of electrons.
Term
Molecule
Definition
Elements (2 or more atoms) that are held together through a covalent bond.
Term
Which type of bond is the strongest?
Definition
Covalent
Term
Hydrogen bonds
Definition
A weak chemical bond formed when a partially charged hydrogen atom from one polar molecule is attracted to a partially negative atom in another molecule.
Term
Polar Molecule
Definition
A molecule containing an uneven distribution of charge due to the presence of polar covalent bonds.
Term
Chemical Reactions
Definition
Process leading to chemical changes in matter, involving the making and breaking of chemical bonds.
Term
Are atoms destroyed in chemical reactions?
Definition
No, they are only rearranged.
Term
Reactants
Definition
Starting material in a chemical reaction.
Term
Products
Definition
Ending materials in a chemical reaction.
Term
4 Properties of Water
Definition
Cohesiveness, Temperature moderation, Density, Solvent
Term
Cohesion
Definition
Water molecules attraction to self because of hydrogen bonds.
Term
Surface Tension
Definition
Measure of how difficult it is to stretch or break the surface of a liquid.
Term
Evaporative cooling
Definition
Property of water whereby a body becomes cooler as water evaporates from the surface.
Term
Ice Floating
Definition
Ice floats because it's less dense than the water its floating in.
Term
Why does ice float?
Definition
Ice floats because of surface tension due to the cohesion of the water molecules and because it's less dense than liquid water.
Term
Solution
Definition
A liquid consisting of a homogeneous mixture of 2 or more substances.
Supporting users have an ad free experience!