Atoms
Periodic Table
This week Energy Changes
Bonding
Biology Cells
100
Only one type of atom
What is an element?
100
Group 1
What group are the alkali metals also know as?
100
energy is lost to the surroundings?
What happens to energy in an exothermic reaction?
100
Delocalised electrons that carry charge through the stricture
Why are metals good conductors of energy?
100
Ribosome
What part of a cell makes proteins?
200
2,8,8
How many electrons do the first shells hold if full?
200
Has 2 electrons in its outer shell
How many electrons in the outer shell of group 2 elements?
200
What does the energy profile diagram look like for an endothermic reaction?
200
ionic bond
What type of bond forms between metals ions and non-metal ions?
200
Chromosomes or Genetic information
What does the nucleus contain?
300
Nucleus
Which part of the atom contains protins and neutrons?
300
Mendeleev
Who created the modern periodic table?
300
A is correct
What letter is the activation energy?
300
The metal ion and non-metal ion form have a strong electrostatic force of attraction (strong bond) that requires a lot of energy to break
Why do ionic compounds have high melting points?
300
large surface area to absorb water at a faster rate
What is an adaptation of a root hair cell to aid its function?
400
Number of protons equal number of electrons
Why does an atom have no overall charge?
400
He left gaps
What did Mendeleev do for undiscovered elements?
400
Sports injury pack
What is an everyday use of an endothermic reaction?
400
The weak intermolecular forces require less energy to overcome
Why do small covalent molecules have low melting points?
400
Missing a nucleus so it can carry more oxygen
What adaptation does a red blood cell have to aid its function?
500
Atoms with the same number of protons but a different number of neutrons?
What is an isotope?
500
Decreasing in reactivity as you go down the group
Describe the reactivity of group 7 (halogens)
500
Thermal decomposition
What type of reaction is endothermic?
500
Each carbon bonds to 4 other carbons
Why is diamond hard?
500
Streamlined to move faster
What is an adaptation of a sperm cell?