Properties of elements
Which element catagory can conduct electricity?
Metals or Non-metals
Metals
Which scientist is responsible for the raisin bun model of the atom?
Thompson
The type of reaction that releases energy is called?
Exothermic reactions
An ionic bond involves the ___________________ of electrons between elements.
transfer
Would a solution with a pH of 7 would be considered acidic, basic, or neutral?
neutral
Which element category is often found in a gaseous state?
Metals or Non-metals
non-metals
Draw a Bohr model for chlorine. How many energy levels are occupied?
3 levels have electrons in them
List 3 pieces of evidence that a chemical reaction occured.
- change in colour
- Odour is produced
- Formation of a precipitate
- Release of energy
- Formation of a gas
A covalent bond (molecular compound) involves the _____________________ of electrons between elements.
sharing
Are acids sour or bitter?
sour
I find an element that is shiny, conductive, and solid. Is this element more likely to be zinc or carbon?
The nucleus contains what 2 subatomic particles?
protons and nuetrons
What are the products of a combustion reaction?
carbon dioxide
water
thermal energy
Which is weaker, ionic or covalent bonds?
covalent
What element is always written first in the compound when creating a formula for an acid?
Hydrogen
Which element type is more likely to form a cation when involved in an ionic bond.
Non-metal or Metal
Metal
Determine the number of protons, neutrons, and electrons for the element on the board.
Protons = 26
Neutrons = 32
Electrons = 26
True or false: In a decomposition reaction the product is often a single compound
FALSE: decomposition reactions result in the formation of elements
Molecular compounds often exist in what state?
Gas
blue
In the compound below which element will lose electrons, which will gain them?
NaCl
Na = lose electrons --> positive
Cl = gain electrons --> negative
Determine the number of protons, and electrons in the Mg2+ ion. (hint: this ion has been written with a charge)
protons: 12
Electrons:10
Is a combustion reaction exothermic or endothermic?
Exothermic, because it involves burning and fire.
Water uses what type of bonding in order to maintain its special functions (such as surface tension)
Hydrogen bonding
Which of the chemicals listed below would be the safest to deal with?
a. pH 2.0
b. pH 4.6
c. pH 7
d. pH 11
C. is neutral and therefor would likely be the safest option