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What type of reaction is involved when stuff rusts?
Synthesis (Fe + O -> FeO)
What happens during a replacement reaction?
Elements in compounds switch around.
What are the three main parts of an atom?
Protons, neutrons, electrons.
Explain what density is.
A ratio between mass and volume. How much mass is in a given volume. It has a relation to hardness - for example, diamond is harder than rubber because it's...
What does it mean for a mixture to be homogenous?
The substances are uniformly distributed; the mixture looks the same throughout (e.g. homogenized milk).
What is an alloy? Give an example.
A mixture (usually a solution) of a metal with another solid. e.g. brass, steel...
In a solution, the substance that the solute dissolves in is called __________
the solvent
In a solution, the substance that dissolves in the other is called ________
The solute.
What's a way to increase solubility of a substance?
Heat
What does "soluble" mean? Explain with an example
Sugar can dissolve in water. It is soluble in water.
Name 4 different ways to separate a mixture. Provide an example where you would use one of them.
Magnetism, sifting, filtration, buoyancy, evaporation, distillation
Which of these mixtures has the substances mixed the most closely (+ most stable)? Colloid, heterogenous mixture, suspension, solution, emulsion
Solution
Why is it important NEVER to mix household cleaning products (or use different cleaning products on the same surface)?
The substances in each solution could react to form a new, dangerous substance
When pure silver (Ag) tarnishes, it becomes Silver Sulfide (AgS). What kind of reaction do you think this is NOT? Why?
Decomposition
What are the 3 main types of chemical reactions? Explain what each involves.
Synthesis (combination of reactants); Decomposition (breaking down into simpler parts); Replacement (switching)
What are 3 ways to make a chemical reaction more likely to happen (or faster)?
increase temperature, surface area, pressure, concentration, stir reactants together, etc.
