Physical Changes
Finish the sentence: In a physical change no __________________
New substances are formed
Finish the sentence: A chemical change involves the formation of ______________
New substances
Name the process when a liquid turns into a gas
Evaporation
What was the colour of the Copper Sulphate solution?
Blue
What is a solvent?
Something that dissolves another substance
Name 2 of the 4 types of physical changes we have discussed in class
Change in state, change in shape, dissolving, mixing
Name 2 of the 4 indicators of a chemical change
Colour change, Gas produced/bubbles formed, Precipitate formed, Change in Temperature
What happens to the temperature of a substance as it turns from a solid to a liquid to a gas
Temperature Increases
What was the colour of the precipitate formed when Silver Nitrate was mixed with Hydrochloric Acid
White
What is a solute?
The substance that gets dissolved
What kind of physical change occurs when oil is added to water
List the indicators of a chemical change present when you start a fire
Gas produced (smoke), temperature change
What happens to the particles of a substances as its temperature decreases
The particles move closer together
When Magnesium metal was added to Copper Sulphate solution, what was the black solid that was formed?
Copper Metal
What special name do we give a mixture where one substance has dissolved in another?
A solution
What kind of physical change occurs when a glass window gets foggy on a cold day
Change of state, water vapor in the air condenses into a liquid when touching the cold glass
List the indicator/s of a chemical change present when you fry an egg
Colour change (Transparent to white)
The name for when a solid turns straight into a gas
Sublimation
What type of gas was produced when magnesium metal was added to hydrochloric acid?
Hydrogen gas
A solid created in a chemical change that does not dissolve
Explain how dissolving is different to mixing
Mixing is just combining two or more substances. Dissolving involves the separation of one substance into tiny particles, these particles are being pulled apart another substance.
Explain why boiling water does not count as a chemical change, even though a gas is being produced
No new substances are being formed, the gas being produced is the same substance as the water, only the state has changed
The name for when a gas turns straight into a solid
Deposition
Why was the mixing of Ammonium Chloride and Water considered a Physical Change?
The ammonium chloride dissolved in the water, dissolving is a physical change as no new substances are formed
Describe the best way to separate a mixture of salt and sand