Year 9 chemistry revision (fun revise!)

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