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WorksheetsYear 9 chemistry revision (fun revise!)
Total questions: 15
Worksheet time: 8mins
What is the law of conservation of mass?
In physics and chemistry, the law of conservation of ////////// states that the total energy of an isolated system remains constant; it is said to be conserved over time. This law means that energy can neither be created nor destroyed
The law of conservation of /////////// says that in chemical reactions, the total mass of the products must equal the total mass of the reactants.
Conservation of /////////// is a fundamental law of physics which states that the momentum of a system is constant if there are no external forces acting on the system.
What is another name for combustion?
reduction
burning
displacement
is this chemical equation balanced?
yes
no
What name is given to the force that holds atoms together in a compound?
chemical bond
gravity
electrostatic attraction
glue?
what is this ?
a Molecule
an atom
What are the three components found in an atom?
Protons
energy
electrons
neutrons
nucleus
Protons are..
negative charged
neutral charged
positive charged
a neutron is..
positive charged
neutral charged
negative charged
an electron is..
negative charged
positive charged
neutral charged
Most atoms are stable, but a small proportion are unstable and undergo //////decay.
magnetic
blue
frog
radioactive
What is an isotope?
A particle
A poisonous dart frog
Isotopes are variants of a particular chemical element which differ in neutron number.
Dust
What are the three types of decay?
gamma
beta
alpha
microwave
Select the best diagram that describes photosynthesis:
What is an acid?
In chemistry, a salt is a solid chemical compound consisting of an ionic assembly of cations and anions. Salts are composed of related numbers of cations and anions so that the product is electrically neutral.
a substance with particular chemical properties including turning litmus red, neutralizing alkalis, and dissolving some metals; typically, a corrosive or sour-tasting liquid of this kind. Often contrasted with alkali and base.
Bases that are soluble in water are called ////
dissolvers
vitamins
quatrins
Alkalis
