Chemistry science quiz

Gr9 first chemistry science quiz, lowkey hate science

Water  

Water  

• H₂O(ℓ) 

• way of communicating water 

• First letter (H) is always upper case 

(ℓ) 

• Water in liquid form

• Not upper case 

• An “L” 

H₂O(ℓ) -> H₂O(s) 

• Physical change  

• Liquid to solid when froze 

• Substance not changed 

Physical change  

• The substance is changed to a different state 

• Substance and formula don’t change 

• Example: Au(s) -> Au(ℓ) 

• No new substance is formed 

Physical property

• boiling point

• physical change

Chemical change 

• Substance and formula change 

• State is changed 

• New substance is formed 

chemical property

• electrolysis

• chemical change

Matter 

• Particles attracted to each other, creating an object 

• Occupies space and has volume 

• An atom  

• Cannot be chemically created or destroyed 

Mass and atoms 

• Cannot be chemically created or destroyed 

• Conserved in chemical change 

Solution  

• Two components  

• Solute (substance being diluted) 

• Solvent (substance that dilutes the solute) 

Symbolic  

Formulas

Macroscopic  

• Observations 

• Visible with naked eye 

Microscopic  

• Not visible with naked eye  

• Particle theory  

Pure substance  

• Single kind of matter having predictable properties 

• Compound 

• Element  

Mixture 

• Physical combination of two or more types of substances  

• Homogenous  

• Heterogeneous  

Homogeneous  

Cannot be physically separated 

Heterogeneous  

Can be physically separated  

Mechanical mixture  

• A mixture that is visible with the naked eye 

• Example: chocolate chip cookie (dough and chocolate chips are clearly visible in the mixture), beach sand (can be separated and visible that there are multiple rocks) 

Compound  

Can be broken down into simpler components  

Element  

Cannot be broken down into other components (purest form)