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Worksheetschemistry
Total questions: 22
Worksheet time: 11mins
I hate it!!!!!!!!!!!!!!!!
I love it!!!!!!!!!!!!!!!!!
It is amazing!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
It is tarebull!!!!!!!!!!!!!!!!!!!!!!
An electron is
positively charged
neutral
negatively charged
atomic number is
the number of protons
the number of electrons
the number of neutrons
the location of an atom on the periodic table
Atomic Mass is the number of
protons and neutrons in the nucleus of an atom
protons and electrons in the nucleus of an atom
neutrons and electrons in the nucleus of an atom
Conservation of mass means
all the atoms present before a chemical reaction are not present after
atoms present before chemical reactions are present after
new substances and new elements are formed in a chemical reaction
An elements is
a substance that cannot be split into simpler substances
a substance that can be split into simpler substances
A pure substance that is a compound is made out of
particles of more than one type of atom
particles of the same type of atom
a mixture of two or more substances that can be physically separated
A molecule is
a singular particle of a particular element
another name for an element
2 or more atoms that are combined
A molecule is
a singular particle of a particular element
another name for an element
2 or more atoms that are combined
which of the statements on physical changes are correct
A physical change cannot be reversed
A physical change is a change in state
A physical change is a change in form
A physical change is where new substances are formed
Signs of a chemical change include;
change of colour, change of temperature, precipitate (solid) formed, gas released.
change of colour, reversing back to original form, precipitate (solid) formed, gas released.
Characteristics of metals on the periodic table are
they are not able to be oxidised
they are poor conductors of heat and electricity
have free electrons
Water is the product of the reactants:
oxygen and water
oxygen and carbon
hydrogen and oxygen
In a chemical reaction, reactants contact each other, bonds between atoms in the reactants
are broken, and
atoms rearrange and form new bonds to make the products.
atoms remain the same and do not form new bonds to make the proudcts
The type of reaction that releases energy as heat is called
endothermic
exothermic
respiration
photosynthesis
if an acid is diluted it
has a large amount of water mixed into it
has a small amount of water mixed into it
is very 'acidus' sour
is corrosive and cannot be eaten
When an acid reacts with a metal following is the product
salt + hydrogen
salt + carbon dioxide + water
bases are the same as an acid
true
false
Bases that dissolve in water are called
caustic
alkalis
reactants
products
A Ph scale of7/8 is
acidic
neutral
basic
To neutralise an acid you add a
acid
base
Ph indicator
equal amount of water
The 'conservation of mass' theory tells us when a chemical reaction occurs in a closed system
there will be no change in mass
there will be a change in mass as it cannot be directly weighed and may dissipate
