Vocab
What word means a force of attraction between atoms due to sharing or transferring of electrons
chemical bond
Define an ionic bond
Ionic bonds are when valence electrons are transferred between atoms
How many atoms of each element are in SF6
1 S 6 F
Which side of the equation is the reactant? Zn + 2HCl ---> ZnCl2 + H2
Zn + 2HCl (left)
What kind of bond gives water its properties
Hydrogen bond
What is a substance that undergoes a chemical change
What bond is a bond between molecules not atoms
hydrogen bond
How many atoms of each element are in Mg2SiO4
2 MG 1 Si 4 O
Which side of the equations shows the products 2H2 + O2 ----> 2H2O
2H2O (right)
How are cohesion and adhesion different
Cohesion is attraction between molecules of the same substance and adhesion is attraction between molecules of a different substance
Define adhesion
The force of attractions between molecules of different substances so that they stick together
What bond is made by sharing electrons
Covalent bond
How many atoms total are in H2O2
4
What must you never change in a chemical equation when balancing it?
The subscript
What causes surface tension to happen?
Cohesion
What is a polar molecule
a polar molecule has a slight positive or negative charge due to the imbalance in the way electrons are shared
What is the weakest bond
Hydrogen bond
Write the chemical formula for 8 Carbon (C) atoms, 10 Hydrogen (H) atoms, 4 Nitrogen (N) atoms, and 2 Oxygen (O) atoms
C8H10N4O2
What must a chemical equation have in order to be balanced?
The same number of atoms of each element on each side of the equation
Why does an ice cube float on water
It is less dense than liquid water
what is a cation vs an anion
a cation is a positive ion and anion is a negative ion
What kind of bond holds together hydrogen gas
Covalent bond
Silver nitrate is made up of 5 atoms total. There are 3 Oxygen atoms and 1 Nitrogen atom. How many Silver atoms are there?
1
Is the following equation balanced? NO + O2 ----> 2NO2
No it is missing a nitrogen on the reactant side
What happens to the molecules in liquid water vs ice and how is it different than other substances
Liquid water molecules are closer together than in ice. Most substances the solid form's molecules are closer together