Rates,Atomic Structure, acids + bases and formulae Flashcards
state what happens when a chemical reaction takes place
Reactants react with each other
state four changes which could indicate a chemical reaction has taken place
Change in colour, temperature change, light may have been produce and formation of gas
what happened to the calcium making it disappear ?
A chemical reaction
what is fizz in a chemical reaction
carbon dioxide bubbles
Whats an unnoticable feature in a chemical reaction ?
Temperature
How can the temperature be seen ?
Thermometer
Suggest one advantage using a gas syringe has compared to collecting gas over
One advantage of using a gas syringe is it has a precise scale
The pH scales is a numbered scale from below ??? to above ????
zero, 14
Acids have a pH ???? 7
below
Alkali have a pH ????? 7
above
Neutral solutions have a pH of ????? 7
Exactly
what colour would the indicator if a solution of ph of 1
Red
what colour would the indicator be if a solution of pH 14
Purple
A solution with a pH of 1 is (more or less) acidic than a solution with pH of 6 ?
More
A solution with a pH of 8 is (more or less) alkaline than a solution with pH 14 ?
Less
State what is meant by the Atomic Number of an element.
the number on the periodic table that equals the number of protons in the nucleus of the atom.
how can atoms be neutral if they contain positive and negative particles
they contain equal numbers of positive protons and negative electrons
what is the mass number of an element
the total number of protons and neutrons in its nucleus
what name is given to these groups of atoms bonded together
A molecule
what name is given to the bond formed between non-metals atoms
covalent bonding
how is the bond between non-metals formed
covalent bonding
what name is given to metal and non metal charged atoms
Ionic Compounds
what type of charge is formed on a metal atom
positively charged ions
what type of charge is formed on a non- metal atom
Negative Charged ions
How are charged atoms formed
Gaining electrons or losing electrons creates an ion
what bond is formed when sodium and chlorine react
Ionic Bond
