Chemistry Y9 Flashcards
What is the relative mass and the electrical charge of a proton?
Relative mass: 1
Electrical charge: +1
What is the relative mass and the electrical charge of an electron?
Relative mass: 0 (0.005)
Electrical charge: -1
What is the relative mass and the electrical charge of a neutron?
Relative mass: 1
Electrical charge: 0
Give the definition of a compound.
Two or more elements chemically bonded together.
Give the definition of a molecule.
Two or more atoms chemically bonded together (these can be the same or different).
Give the definition of a mixture.
Made of anything MIXED together (not chemically bonded).
Give the definition of an element.
One type of atom.
Give the definition of an atom.
One type of substance on its own.
Where are the electrons in an atom?
Orbit the outside of the nucleus.
Where are the protons in an atom?
In the nucleus (in the middle).
Where are the neutrons in an atom?
In the nucleus (in the middle).
What is a nucleus of atom made of?
Protons and neutrons.
Nitrogen has a -3 electrical charge. Magnesium has a +2 electrical charge. Make Magnesium Nitrate by balancing the electrical charges.
Mg₃N₂
Aluminium has a +3 charge. Bromine has a -1 charge. Make Aluminium Bromide by balancing the electrical charges.
AlBr₃
Balance out this equation:
__Al + __HCl —> __H₂ + __AlCl₃
2Al + 6HCl —> 3H₂ + 2AlCl₃
Balance out this equation:
__N₂ + __F₂ —> __NF₃
N₂ + 3F₂ —> 2NF₃
Name the for states of mater
Solid, Liquid, Gas and Aqueous
What do the groups of the periodic table tell us about the structure of the atom?
The number of electrons on the outer shell.
What do the periods tell us about the structure of the atom?
The number of shells it has.
Who created our final version of the periodic table?
Dimitri Mendeleev
What si the name of the element 19?
Potassium (K)
What does the atomic number represent?
The number of protons (or electrons)
What does the atomic mass represent?
The mass of the protons + the neutrons (the nucleus).
Technically the mass of the whole atom but electrons have too small mass
What equipment do you put a solution in for crystallisation
Evaporation basin
