Blue
What is the smallest unit of matter?
The atom
A substance that is made of atoms of different elements that are bonded together in a certain ratio
A compound
What distinguishes one element from another?
The number of protons in the nucleus.
What does the size of water do when it freezes?
It expands
The attraction among molecules of different substances.
Adhesion
This Greek word means indivisible
Atomos
True or false- The properties of a compound are the same as the properties of the elements that make up that compound...For example NaCl
False!
How is an ionic compound formed?
One or more electrons are transferred from one atom to another
How is water like a magnet?
Water molecules have a positive end and a negative end. It is a polar molecule.
Many molecules and ions can only take part in chemical processes unless this happens first.
They dissolve
Two or more atoms that are joined together by covalent bonds
Molecule
This forms from an atom that has gained or lost electrons
Ion
What is the difference between an ionic bond and a covalent bond?
In an ionic bond electrons are transferred from one atom to another, in a covalent bond electrons are shared between atoms.
Why are some molecules polar?
Because the pull on electrons is unequal.
A mixture of substances that is the same throughout
A solution
One particular type of atom
Element
This forms through the electrical force between oppositely charged ions
What is an ionic bond
How does an atom differ from a molecule?
A molecule is made up of at least 2 or more atoms stuck together, a molecule is just one individual particle.
Water resists changes in temperature- This property is called what?
High specific heat capacity
A compound that releases a proton in water
An acid
These determine the properties of an element
The electrons in atoms
This forms when atoms share a pair of electrons
A covalent bond
How can a hydrogen atom become either an ion or part of a molecule?
Sometimes it can lose an electron and other times it can share its electrons
The attraction among molecules of a substance
Cohesion
A solution that produces OH ions in water
A base