States of Matter and Phase Changes
solid, liquid, and gas
What is a mixture?
A mixture is a substance that is made up of two or more substances that are combined.
What type of mixture would you use the Sieving method for?
a mixture of two solids or more that are different in sizes
What is a chemical reaction?
A chemical reaction is when substances go through a chemical change to form a new substance.
What is Carbon Dioxide (CO2)?
Carbon Dioxide is a colourless, odourless gas that is heavier than air.
What does 'condensation' mean?
Condensation is when a gas changes into a liquid.
What is a solution?
A type of mixture where one substance is dissolved in the other, which causes a chemical reaction.
What is one method that you can use to separate liquid mixtures?
Distillation or Decanting
A rotting egg is an example of a chemical reaction. How?
Explain surface tension.
A force that is on the surface of a liquid that causes the top layer of it to behave like an elastic sheet. The surface of a liquid is strong enough to hold weight.
When frost develops on your window, which phase change is it going through?
Deposition
What is the method that can be used to separate insoluble substances from a liquid?
Filtration
What is the difference between reversible and irreversible change?
Reversible changes mean that you can change back to its original form. Substances that have gone through an irreversible change cannot go back to their original form.
A precipitate formation is evidence of a chemical reaction. A precipitate is a solid that forms when you mix two substances together.
What is the phase change when a solid turns into a gas without going through the liquid state?
Sublimation
Heterogenous Mixture
Explain the Evaporation method of separating a solid and liquid mixture, such as salt and water.
What is the difference between a chemical and physical change?
In chemical changes, a new substance with different properties is formed. In physical changes, the substance has changed form but it still has the same properties.
What does it mean when a substance has a pH level of 7?
A pH level of 7 means 'neutral'. It is neither basic nor acidic.
What are the 6 phase changes?
melting, freezing, condensation, vaporization, deposition, and sublimaton
What are the 3 types of mixtures?
solid and liquid, solid and solid, liquid and liquid
What are the 4 methods of separating solid mixtures?
Sieving, Floatation/Water, Wind, and Magnetic
What are the 5 evidence of a chemical reaction?
odour, precipitate formation, gas bubbles, energy change, and colour change
Is a substance with a pH level of 14 more dangerous than a substance with a pH level of 1? Why or why not?
No, both substances are equally dangerous because one substance is a strong base while the other one is a strong acid. Both substances just have different reactions.