Year 9 chemistry revision

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

Which of the following reactions is a combustion reaction ? 

• MgCO3 + O2 → MgO + CO2  
• C3H8 + 5O2 → 3CO2 + 4H2O 
  
• 6CO2 + 6H2O → C6H12O6 + 6O2 
• 6CO2 + 6H2O → C6H12O6 + 6O2 

What is the law of Conservation of Mass?

• A measure of how much mass is created or destroyed. 
• Mass can neither be created nor destroyed during a chemical reaction. 

Is oxygen metal or nonmetal?

• metal
• nonmetal

Tags

NGSS.MS-PS1-1

What side of the periodic table are nonmetals on?

• left
• right 
• top
• bottom

How many different elements are in this chemical formula: C₂H₂ClK₃

• 6
• 8
• 2
• 4

Tags

NGSS.MS-PS1-1

How can you tell that a metal is reacting with water?

• Colour change
• Bright light
• Fizzing
• It gets colder

Tags

NGSS.MS-PS1-2

Which salt will be produced if magnesium react with hydrochloric acid?

• Magnesium oxide
• Magnesium sulfate
• Magnesium sulfide
• Magnesium chloride