Y9 Topic 1 Flashcards
What is an atom?
the smallest particle of a chemical element that can exist.
What is a molecule?
A collection of two or more atoms held together by chemical bonds.
How are the atoms in a molecule linked together ?
The atoms in a molecule are linked together through chemical bonds, which can be broadly of two types: Ionic Bonds(transfer through electrons) Covalent bonds(the equal sharing of electrons from both participating atoms).
What is a compound?
A compound is a substance that contains two or more elements that are chemically combined. The elements in a compound are present in fixed proportions
What are the three types of compounds?
Ionic, covalent (molecular)
What is an Element?
A substance made of one type of atom only.
What are the chemical formulae of the elements neon, nitrogen and sodium?
Ne
N2
Na
How many elements are in Na2CO3?
3 Na2|C|O3
What is an electron?
a negatively charged subatomic particle that has almost no mass
How many electrons can you fit into a proton?
2000
What is a proton?
the positively charged particles which are present in the nucleus of an atom and have a charge of plus 1
Why are protons so important?
it gives the atom its identity according to the number of protons in an atom
What is a neutron?
subatomic particles found inside the nucleus of every atom
What does a neutron do?
help stabilise the nucleus of an atom
What is a solution?
solution is a special type of mixture composed of two or more substances
What is an example of a solution?
Salt water/ sugar dissolved in water/ rubbing alcohol
What is a solvent?
A liquid in which a substance dissolves in is called the solvent
What is an example of a solvent?
Water, methanol, acetone, ethanol
What is a solute?
A substance that is dissolved in a solution
What is an example of a solute ?
Salt, antifreeze, sugar
How do you balance a chemical equation?
First, count the atoms on each side. Second, change the coefficient(amount) of one of the substances. Third, count the numbers of atoms again and, from there, repeat steps two and three until you’ve balanced the equation.
Is this equation balanced- Ca + Cl2 → CaCl2.
Yes
What is a reactant?
Reactants are the starting materials in a reaction that undergo a chemical change to form a product
Which part of the word equation is the reactants
Mg+HCL—>MgCl2+H2
Before the arrow
What is a product?
A product is where substances are being chemically bonded together
