Mixture types
Give two examples of the solution
Salt solution, sugar solution
Explain the filtration process
Removing solids from the liquid, sieving
How do particles move in the solid state of matter?
They vibrate, move back and forth
How do we call the chemical reaction between acid and alkali?
Neutralisation :)
What do we call as a chemical reaction?
Process when 1 or more new substances formed
Define the colloid. Describe the appearance of the colloid
Mixture of two substances, where one dispersed in another. It is milky or opaque
What happens to a mass of water salt solution if it is left under the sun for a long time? Explain your answer.
Mass will decrease as the water will evaporate from the solution
What does melting mean?
When solid turns into liquid
Name the substance that allows us to monitor the neautralisation process
Universal indicator
Which hazard symbol is used for the substances that catches fire easily?
Flammable
Define the suspension. How it can be separated?
Suspension is the mixture in which solid is suspended in the liquid. It can be filtered.
Name four methods of mixture separation
Evaporation, distillation, filtration, chromatography
Explain the difference between element and compound
Element is the substance that consists of 1 type of atom, when compound - more than one
State whether these substances are acidic, alkaline, or neutral: Water, lemon juice, salt solution, vinegar, soap, sugar solution, lithium hydroxide
water - neutral, lemon juice - acidic, salt solution - neutral, vinegar - acidic, sugar solution - neutral, lithium hydroxide - alkaline
Name all 6 hazards symbols that we passed.
Flammable, Caution, Corrosive, Explosive, Toxic, Dangerous to the environment
What do we call as solute and solvent?
Solute - solid in solution
Solvent - liquid in solution
Explain the difference between distillation and evaporation
In the case of distillation, we condensate the water vapor back into pure water. In the case of evaporation, steam will just go to the air
How do particles move in liquid state? (two types of their movement)
They vibrate, move past each other
Name the general word equation for neutralisation chemical reaction: acid + alkali =
Bonus: name products and reactants in this reaction to get extra 200 points
acid + alkali = salt + water
acid, alkali - reactants; salt, water - products
Name a word equation for the following chemical reaction: hot copper metal reacts with chlorine gas to form solid green copper chloride
Bonus: mark elements and compounds in this reaction and explain your answer for extra 200 points
copper (element) + chlorine (element) = copper chloride (compound)
What will happen to solids in the suspension if you leave it for a long time?
Solids will settle on the bottop, suspension will separate by itself
Explain the paper chromatography process in 3 steps
1) Putting the drop of ink on the bottom side of the special paper
2) Lowering the bottom side of this paper into solvent
3) Colours that were included in the drop will spread through the paper (the fastest one will be at the top)
Explain in terms of particles why solution is transparent
When solid dissolves in the liquid, it falls apart in such a small pieces, that light can easily pass through
Name a word equation for the chemical reaction that results in the formation of sodium chloride
sodium hydroxide + hydrochloric acid = sodium chloride + water
For each of the following, determine whether the process is a chemical reaction or a physical change:
melting, neutralization, evaporating, dissolving, combustion (burning), solidifying, thermal decomposition
melting - physical, neutralisation - chemical, evaporating - physical, dissolving - physical, combustion (burning) - chemical, thermal decomposition - chemical