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Tutor profile: Heather L.

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Heather L.
UCLA graduate with years of STEM teaching experience
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Questions

Subject: Chemistry

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Question:

What is the difference between metals, nonmetals, and metalloids?

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Heather L.
Answer:

Metals conduct electricity, have luster, and are malleable and ductile. They are found in the middle of the periodic table. Some examples include copper, lead, tin, and nickel. Nonmetals do not conduct electricity and are neither malleable nor ductile. Sulfur and nitrogen are examples of nonmetals. Metalloids have the appearance of a metal but can behave chemically like a metal or a nonmetal depending on the conditions. Examples include boron, silicon, geranium, arsenic, antimony, and tellurium. They can be found in a ladder on the right side of the periodic table.

Subject: Biology

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Question:

What is the difference between these species interactions: mutualism, commensalism, and competition?

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Heather L.
Answer:

Mutualism occurs when both species mutually benefit from the interaction. An example of this occurs in coral and algal endosymbionts when zooxanthellae and coral polyps work together to survive. The algae produces nutrients that the coral needs to build reefs and the coral gives the algae a safe and nutritious home. Commensalism is when one species benefits by the interaction but the other is unaffected. An example of this would be an orchid living on a tree host. The orchid is receiving shelter and the tree is not particularly burdened by its presence. Competition for limited resources comes in two types - intraspecific (same species) and interspecific (different species). This happens when there is niche overlap and it is detrimental to the fitness of both parties. For example, Individuals can compete for food, habitat, or mates.

Subject: Physics

TutorMe
Question:

When looking at electromagnetic waves, what is the difference between amplitude, period, and frequency?

Inactive
Heather L.
Answer:

The amplitude (A) is the height of the wave above the x-axis or center line. The Period (T) is how long it takes the wave to complete one full cycle. This will be in units of seconds/cycle. The frequency (v) is the number of cycles the wave makes per unit time, making it the inverse of the Period. In other words, v = 1/T .

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