Extra chem test

Question 1

how to find protons from periodic table

Answer 1

atomic number

Question 2

how to find electrons from periodic table

Answer 2

same as protons (atomic number)

Question 3

how to find neutrons from periodic table

Answer 3

rounded atomic mass - atomic number

Question 4

what is produced from acid reacting with base

Answer 4

salt and H2O (water)

Question 5

what is produced from acid reacting with metal

Answer 5

H2 (hydrogen) gas and salt

Question 6

what is produced from acid reacting with carbonate

Answer 6

salt, H2o (water) and CO2 (carbon dioxide)

Question 7

what is chromate

Answer 7

…….-2
CrO
………3

Question 8

what is dichromate

Answer 8

……….-2
Cr O
….2…..7

Question 9

what is oxalate

Answer 9

…….-2
C O
…2…4

Question 10

What to remember about electron dot diagrams (ionic compounds)

Answer 10

• positive ions = no electrons are shown
• negative ions = full electrons as they have been gained to attain a full shell
• include charges outside brackets
• if numbers are needed to balance, place at bottom, outside of brackets

Question 11

define dissociation

Answer 11

when solid ionic compounds dissolve in water, lattice of ions breaks apart into independent monatomic ions

Question 12

Eg of dissociation equation:

Answer 12

NaCl(s) –> Na+(aq) + Cl-(aq)

Question 13

in ionic bonding what do metal atoms do

Answer 13

lose e- form cations

Question 14

in ionic bonding what do non metal atoms do

Answer 14

gain e- form anions

Question 15

what are 5 properties of acids

Answer 15

• Taste sour
• Are corrosive (burn skin)
• Release at least one hydrogen ion (H+)
• Conduct electricity
• Turn blue litmus paper red

Question 16

what are 6 properties of base

Answer 16

• Taste bitter
• Soapy feel
• Are caustic – burn the skin
• Can release hydroxide ions (OH-)
• Conduct electricity
• Turn red litmus paper blue