Two or more atoms bonded together
Molecule
What are the names of the two elements in CO2?
Carbon & Oxygen
What is the name for an ion that has a positive charge? (cation or anion)
Cation
A covalent bond is a bond between atoms where they ______ at least one electron.
Share
TRUE or FALSE: Hydrogen bonds are the strongest kind of chemical bond.
FALSE: Hydrogen bonds are weak bonds.
A molecule that has more than one element in it
Compound
How many atoms are in the molecule CH4?
5 atoms
What is the name for an ion that has a negative charge? (cation or anion)
Anion
What is the only element that forms covalent bonds and needs only 2 electrons in its outer energy level in order to be stable?
Hydrogen
A substance that is a combination of atoms and/or molecules, but they are not bonded together.
Mixture
How many atoms of Silicon are in the molecule H2SiO3?
1 atom of Silicon
Ionic Bonds form between ions that have ______________ charges. (same or opposite)
Opposite charges
How many electrons do most elements need in their outer energy level in order to be stable?
Eight electrons
Which vocabulary word means: The condition of having poles (a positive pole and a negative pole)
Polarity
An atom that has a positive or negative charge because it has lost or gained electrons
Ion
How many atoms are in the molecule C6H12O6?
24 atoms
If two negative ions get close to each other, will they attract each other or repel each other?
Repel each other
TRUE or FALSE: Atoms in a covalent bond can share 3 electrons.
False: Atoms in a covalent bonds can share 2 electrons (single bond) or 4 electrons (double bond), but not 3.
Hydrogen bonds are responsible for many of the physical properties (like surface tension and condensation) of which substance?
Water
Not likely to react with other atoms
Stable
What is the chemical formula for a molecule with these atoms: hydrogen, hydrogen, carbon, oxygen, oxygen, oxygen?
H2CO3
Do ionic bonds form molecules?
No, they form ionic compounds that look like crystals.
What is the largest number of electrons that can be shared between two atoms in a covalent bond?
Six electrons (this is called a triple bond)
Which atom in a water molecule has a slightly negative charge? (oxygen or hydrogen)
Oxygen because it has high electronegativity and pulls the shared electrons closer to it.