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Tutor profile: Shienn R.

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Shienn R.
Middle School Science Teacher
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Questions

Subject: Earth Science

TutorMe
Question:

What is the difference nothing between mold and cast fossils?

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Shienn R.
Answer:

Let's talk about and explore the difference. Molds are formed when sediment bury the organism and whatever sediment that covered the organism changes into rock. Once the organism decays the remaining cavity shape of the organism is known as the mold fossil. Cast fossils are formed when the molds we just discussed are filled with sand or mud and harden into the shape of the organism that decade. It would be better for me to show you a quick demonstration. I did this quick lab with a class I once taught. We actually created both examples of these fossils. If you have time to turn your camera on we can walk through the demonstration together and you can see the difference between the two.

Subject: Basic Chemistry

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Question:

What is the difference between compounds and mixtures?

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Shienn R.
Answer:

Let's explore the two. On a sheet of paper create a T-chart. On the left side of your chart write compound and on the right side write mixture. This way we can see and better understand the two. A compound contains two or more elements that are chemically combined. For example, a cake is considered a compound. There are more than two different ingredients that are combined together to make the batter (eggs, flour, sugar, water, milk, etc.). When heat is added these things bind together to form a cake, you cannot see the individual components anymore but they still exist. A mixture on the other hand is considered a blend of two or more substances which are not chemically combined. For example, trail mix would be considered a mixture because there are raisins, nuts, chocolate, etc. added together or mixed in the bag.

Subject: Physical Science

TutorMe
Question:

What is the difference between a physical and chemical change?

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Shienn R.
Answer:

Great question let me help you understand the difference between the two. A physical change can normally be reversed. We can use out senses to identify these normally. Think of them as their properties changing but their substance stays the same, meaning their chemical makeup is never changed. For example if we cut a sheet of paper, the paper is still paper but we changed its appearance by cutting it. Another example think about water and ice, they are both made up of Hydrogen and oxygen atoms but their states are different. Let's explore a chemical change. These occur when a different substance is produced. Let's use the paper example again. If I take a sheet of paper and burn it, it turns into ash. This new substance is no longer considered paper, since we added heat to change the properties of the paper we created a chemical reaction.

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