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Some examples from this set of practice questions
1.
What is the difference between a mixture and a compound?
Answer: A mixture is a physical combination of two or more substances, while a compound is a chemical combination of two or more elements that forms a new substance with unique properties.
2.
How are mixtures classified?
Answer: Mixtures are classified into two main types: homogeneous and heterogeneous. Homogeneous mixtures are uniform throughout, while heterogeneous mixtures are not.
3.
Give some examples of homogeneous and heterogeneous mixtures.
Answer: Homogeneous: salt water, air, sugar water Heterogeneous: sand in water, paint, salad dressing
4.
What are the key characteristics of solutions?
Answer: Solutions are homogeneous mixtures of a solute (dissolved substance) and a solvent (dissolving substance). They are clear and transparent.
5.
What are some common examples of alloys?
Answer: Brass, bronze, stainless steel, amalgam
6.
What distinguishes suspensions from colloids?
Answer: Suspensions have larger particles that settle out over time, while colloids have smaller particles that remain suspended.
7.
How are colloids formed?
Answer: Colloids can be formed by various methods, including dispersing a solid in a liquid, condensing a vapor into a liquid, or emulsifying two immiscible liquids.
8.
What are the different ways to express the composition of a mixture?
Answer: Percent by mass, percent by volume, molarity
9.
How do you calculate the percent by mass of a component in a mixture?
Answer: Divide the mass of the component by the total mass of the mixture and multiply by 100%.
10.
What is the difference between molarity and molality?
Answer: Molarity is the number of moles of solute per liter of solution, while molality is the number of moles of solute per kilogram of solvent.
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