Liquids in Liquids
What is a mixture of two liquids called
A solution or a homogeneous mixture.
What is a common example of a solid dissolved in a liquid?
Salt in water or sugar in water. Answers may vary
What is a solution?
A homogeneous mixture of two or more substances where one substance dissolves in another
What is a mixture?
Any combination of two or more substances where each retains its own properties.
How do you separate oil from water?
Since oil is less dense than water, it floats on top. Skimming or using a separatory funnel can separate the oil.
What is the Law of Conservation of Matter?
Matter cannot be created or destroyed in a chemical reaction; it is conserved.
Name a beverage that is an example of liquids mixed.
Water and oil. Answers may vary
Name a drink where sugar is dissolved in water.
Lemonade. Answers may vary.
Give an example of three solutions.
Salt solution, sugar solution, vinegar in water.
If I added rocks to a glass of water, do I have a mixture? Explain.
Yes, I have two objects placed together who maintain their physical properties.
How can sugar be separated from small rocks?
By using a strainer with small holes to separate the rocks and the sugar falls through.
How does the conservation of matter apply in a kitchen setting?
When cooking or baking, the mass of ingredients combined equals the mass of the finished product.
Can liquids and liquids be a mixture?
Yes, they can form a homogeneous mixture if miscible
How does stirring affect the rate of a solid dissolving in a liquid?
Stirring increases the rate of dissolution by moving more solute into contact with the solvent.
What does the prefix “sol” mean?
"Sol" refers to a substance that is dissolved, leading to a solution.
Find three examples of mixtures in your classroom
Answers may vary.
How do you separate salt from a mixture of salt and water?
By evaporation: heating the solution until the water evaporates, leaving the salt behind
If you were placing 15 grams of salt into a glass of water that weighed 50 grams, how much would the solution weight.
65 grams
What would be easier to separate: a mixture of rocks and sand or a mixture of water and oil? Explain why.
The rocks and sand would be easy to separate with a sieve or strainer due to size difference. The oil and water separation is due to density differences.
How do we know that solids and liquids can create a mixture?
When I add a solid such as sand to water the sand keeps its properties. It sinks in the water and can be easily removed
What is the difference between a mixture and a solution?
A solution is a special kind of mixture where one ingredient dissolves in another.
Explain why a solution is a mixture but not all mixtures are solutions.
Solution is a special kind of mixture where one ingredient dissolves in water.
How can you separate a mixture of sand, sugar and water?
Filter out the sand.
Evaporate the water.
The sugar will be left behind.
A scientist is about to add 25 grams of salt to a glass of water weighing 72 grams. As she is pouring the salt in 5 grams of the salt fall on the counter. What is the total amount of grams of the new solution.
92 grams
How would you separate a mixture of oil and water?
Since oil is less dense than water, it will float on top. You can carefully pour off the oil into another container, leaving the water behind. This method is simple but may not remove all the oil.
Give an example of three mixtures that are created with solids and liquids
Sand and water, cereal and milk, tea leaves and hot water.
How would you separate a saltwater and iron filing solution?
1. Use a magnet to remove the iron filings. 2. Boil the water to evaporate it. 3. The salt remains in the glass.
Give an example of 4 mixtures found at home.
Sugar and flour, oil and vinegar, detergent and water, air (a mixture of gases).
Create a mixture that would require a strainer or filter, a magnet, and evaporation in order to separate.
Answers may vary.
What demonstrates the conservation of matter in water cycles?
The total amount of water on Earth remains constant, cycling between liquid, vapor, and ice.