Elements
What is formed when elements join together?
A compound
What is listed on the periodic table?
Pure elements
Name 3 states of matter.
Solid, liquid and gas
What is 'the conservation of mass?'
Whatever goes into the reaction must come out
mass of the reactants is equal to the mass of the products
What is an organelle?
A structure found in cells with a specific function e.g. mitochondria are the site of respiration
What name is given to the elements in group 1?
Alkali metals
On the periodic table, what is a period?
A horizontal row
Why is ice, as a solid, considered unusual?
Ice, a solid, floats in water, a liquid.
Name 3 ways to prevent metals from rusting.
Galvanise (zinc coat); cover in oil; paint
What is haemoglobin?
A biological molecule in red blood cells to which oxygen attaches.
How would you describe group 1 elements?
very reactive metals
How was the early periodic table arranged?
By atomic mass
Name 3 ways to change the pressure of a gas.
reduce the volume; increase the temperature; increase the amount of gas
What does a catalyst do?
Speeds up a reaction
What are cilia?
Hair like protrusions on the inside facing surface ofa cell
What name is given to group 0/8 elements?
Noble gases
How is the modern periodic table arranged?
By atomic number
Why is there no change of temperature while a substance is changing state?
The energy is breaking the bonds between the molecules.
Why are metals alloyed with other elements?
To change their properties, make them stronger
What is the scientific name for moving air into and out of the lungs?
Ventilation
What name is given to group 7 elements?
The Halogens
Who arranged the first periodic table that led to the modern version we have today?
Mendeleev
What is the formula for calculating density?
mass/volume
What is sublimation?
A solid turning into gas without going through the liquid phase
This makes up 55% of blood.
Plasma