Question

name per date chemistry
visiting & classifying mixtures class activity
answer all the questions. use complete sentences and provide examples to support your responses

1. is the following sentence true or false? most samples of matter are mixtures. why/why not?
2. what is a mixture?
3. is the following sentence true or false? a heterogeneous mixture is one that has a completely uniform composition. why/why not
4. what is another name for a homogeneous mixture? describe.
5. circle the letter of the term that describes a part of a sample having uniform composition and properties and provide an explanation for either yes or no.

a. solution why/why not:
b. mixture why/why not:
c. state why/why not:
d. phase why/why not:

1. how many phases exist in these types of mixtures? describe using complete sentences to get full credits.

a. homogeneous
b. heterogeneous
essay writing. use complete sentences to describe the following:
is matter still the same even though it has changed state? how do you know?
can water be all three states? explain.
matter is everything, it has mass and takes up space. explain this.
what type of matter is most suited to build bridges? why?
what type of matter is most absorbent? how do you know?
what type of matter is more suitable to build wheels from? why do you think so?
what types of matter do we eat?
brainstorm all the matter you can think of that is flexible and will bend.
can you think of things that arent matter? (sound, thoughts, colors, shadows)

Explanation:

1. True. Most everyday - encountered substances are mixtures. For example, air is a mixture of nitrogen, oxygen, and other gases.
2. A mixture is a combination of two or more substances that are not chemically combined and can be separated by physical means. For example, a mixture of sand and water.
3. False. A heterogeneous mixture has a non - uniform composition. For example, a mixture of oil and water has distinct layers.
4. Another name for a homogeneous mixture is a solution. It has a uniform composition throughout, like salt dissolved in water.
5. a. Solution. A solution has uniform composition and properties because the solute is evenly distributed in the solvent at a molecular level.
6. a. Homogeneous mixtures have one phase as the components are uniformly distributed. b. Heterogeneous mixtures have two or more phases as the components are not uniformly distributed and can be visually distinguished.

For the essay - writing part:

• Matter is the same even if its state changes because the chemical composition remains the same. For example, water as ice, liquid water, or steam is still H₂O.
• Water can be in all three states. It is a liquid at room temperature, can freeze into ice (solid), and can evaporate into steam (gas).
• Matter has mass and takes up space. For example, a book has mass and occupies a certain volume on a shelf.
• Metals are most suited to build bridges because they are strong, durable, and have high tensile strength.
• Sponges are an example of absorbent matter. They can hold a large amount of water due to their porous structure.
• Metals or rubber are suitable for building wheels. Metals for their strength and durability, rubber for its elasticity and shock - absorbing properties.
• We eat various types of matter such as carbohydrates (e.g., bread), proteins (e.g., meat), and fats (e.g., butter).
• Examples of flexible matter are rubber bands, plastics like polyethylene.
• Things that aren't matter include thoughts, which are non - physical mental processes; colors and shadows are also not matter as they do not have mass or occupy space.

Answer:

1. True. Most everyday substances are mixtures, e.g., air.
2. A combination of two or more substances not chemically combined, separable by physical means, e.g., sand - water mixture.
3. False. Non - uniform composition, e.g., oil - water mixture.
4. Solution. Uniform composition like salt - water.
5. a. Solution. Uniform composition at molecular level.
6. a. One phase. b. Two or more phases.

Essay - writing answers as above.