Atoms Structure
The particle that is positively charged
Proton
The two particles that take up most of the mass of the atom
Protons and Neutrons
What do the Groups tell us about the Structure of the atom?
number of valence electrons (How many electrons are in the outer shell)
How many atoms of Oxygen are in the chemical formula H2SO4
4
Physical or Chemical Change: Sharpening a pencil
Physical Change
The particle that is negatively charged and has no mass
Electron
The electronic configuration of a particle is 2/8/4. In which group is it located? How do you know that?
group four (VIA) because four valence electrons are in its structure.
What do the Periods tell us about the Structure of the atom?
Energy Levels/Shells?
How many atoms of Oxygen are in the chemical formula 2H2PO4
8 Oxygen
Physical or Chemical Change: Baking a cake
Chemical Change
The locations of the electrons
Electron Cloud rotating around the nucleus.
How do you find the Mass Number?
The bigger number written is the square related to each element.
What is the number of energy levels of the element Magnesium?
3 Energy levels/shells
How many atoms of Oxygen are in the chemical formula Ba3(PO3)2
6 Oxygen
When baking soda and vinegar mix, the solution gets colder. So this reaction is .........
Endothermic
How many Neutrons are in an atom of Boron?
6 Neutrons
If the Atomic number of an atom is 15, how many electrons does it have?
15 Electrons
The number of valence electrons of the element Oxygen
6 valence electrons
The total atoms is in Sodium Bicarbonate (NaHCO₃)
6 total atoms
The Evidence of Chemical Change in mixing vinegar and milk and which forms chunks
Precipitate is produced
The atomic number of K+ is 19. How many electrons are in that?
18
When sodium reacts with hydrochloric acid, some bubbles are produced. Where do those bubbles come from?
Hydrogen gas is produced, and the evidence of gas production in a chemical reaction is bubbling.
What is the mass percent of a solution when 10 grams of sodium chloride salt are mixed with 10 dm3 of water?
10 L water =10 Kg water = 10000 g water
m(solution) = 10 + 10000 = 10010 g
m% = 10/10010*100 = 0.099%
How many total atoms are in the chemical formula 2Co2(SO4)3?
34 total atoms
Name all the evidence of chemical change. (5 options)
Production of Precipitate, Energy Change, Color Change, Bubbles, Smell (Odor)?