Bonding
Which type of bonding involves the sharing of electrons?
Covalent bonding
What charge do Group 2 metal ions have?
+2
What is the unit for energy?
J or kJ
What is the formula for density?
Mass/Volume
Why do helium balloons float but air balloons don't?
Helium is less dense than air
Which substance has metallic bonding?
A) NaCl
B) O₂
C) Cu
C) Cu
What happens to reactivity down Group 1?
Increases
What is the specific heat capacity of water?
4.2 J/g°C
Density will increase
Lock in.
Explain the difference between "to cook" and "to be cooked" in slang.
To cook - something is about to be impressive
To be cooked - ruined/over/beyond saving
Why are metals malleable?
Layer of positive ions can slide over each other
Explain the bonding within magnesium in Group 2.
Metallic Bonding.
Electrostatic attraction between delocalised electrons and protons in the nucleus.
What is Q for 50g of water if its temperature increased from 10 degree C to 20 degree C.
2100J
Calculate mass of an object with a density of 2g/cm3 and a volume of 10cm3.
20g
Which basketball team is the person who popularised 6...7 on?
LaMelo played for the Charlotte Hornets (NBA)
Explain why graphite can conduct electricity but diamond cannot. What element are they made from and what type of bonding is involved?
Carbon.
Graphite has delocalised electrons; diamond does not (all carbons are covalently bonded to 4 carbons).
Decreases.
More shells as you go down the group, positive nucleus further away from delocalised electrons, less electrostatic attraction, less energy required to break these bonds.
How would you improve the accuracy of using a calorimeter in the school lab?
Use a lid, use an insulator
A 16g cube has a side of 2cm. What is its density?
2 g/cm3
Which element is the most abundant element in the universe?
A) Helium
B) Carbon
C) Glucose
D) Hydrogen
D) Hydrogen
Which of the following compounds have a higher melting point?
MgO or NaCl. Why?
MgO.
2 electrons need to be transferred for MgO.
2+ and 2- electrostatic attraction is stronger than 1+ and 1- (for NaCl)
Magnesium oxide layer (black layer)
Why are calorimeter energy level calculations lower than actual energy present within fuels? Give 2 reasons.
Heat loss to surroundings --> So temperature rise of water is less than it should be.
Some water has evaporated --> mass of water is affected
Mass of fuel burnt can be inaccurate
What happens to the density of an object if both its mass and volume are doubled?
Density stays the same
Which singer’s full name is Stefani Joanne Angelina Germanotta?
Lady Gaga