Atoms
Define atom.
The smallest unit of matter.
What is the atomic number of Silver? (Ag)
47 (# of protons)
What is a chemical reaction?
Substances changing into other substances through rearrangement of atoms.
How many atoms of carbon are there: CO2
1
What charge does a neutron have?
None/Neutral
What are the three subatomic particles?
Protons, Neutrons, and Electrons
What is the atomic mass of Boron?
11 amu or 10.8
How can you tell if a reaction is endothermic?
It feels cold, atomic bonds are broken, energy is absorbed.
How many atoms of hydrogen are there: CH4 ?
4
What is the small number called in a chemical formula?
Subscript
What charge does a electron have?
Negative.
How many neutrons are in an atom of Nitrogen?
7 neutrons
What are 3 signs of a chemical reaction?
Answers may vary (change in color, smell, temperature. production of gas, light, precipitate. ect...)
How many molecules of glucose are there: 2C6H12O6 ?
What kind of gas created through mixing baking soda and vinegar is able to put out a candle?
(we watched a video on this last week!)
Carbon Dioxide (CO2)
What particle determines the atomic number of an element/atom? What is the charge of this particle?
Protons / positive
What two particles of an atom make up the atomic mass shown on each element of the periodic table?
Protons and Neutrons.
What does the arrow in the middle of a chemical equation mean?
Yields
What is the name of the large number at the front of a chemical formula?
Coefficient
What is the Law of Conservation of Mass?
Matter cannot be created or destroyed.
These are located in the outermost ring/shell of an atom.
Valence Electrons
Who first came up with the periodic table of elements? (We watched a video about this early on!)
Dmitri Mendeleev
Is this reaction endo or exothermic?
C + O2 → CO2
Exothermic (bonds are being made)
How many atoms of Oxygen are there: 3C9H13NO3 ?
(molecule of adrenaline)
9
Why are valence electrons so important/special?
They are used in bonding.