Which best describes an element? a pure substance a type of a mixture a pure compound an impure substance

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Answer 1

Answer: An element is a pure substance. It is the purest and most basic form of any substance on Earth. There are a total of 118 discovered elements, 94 of which naturally occur on Earth. The 24 other elements are synthetic or man-made. Elements are atoms that are made of subatomic particles known as protons, electrons, and neutrons.

Answer 2

Answer:

Answer:

an element is a pure substance

Explanation:

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What is locked up carbon dioxide

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Basically it means carbon dioxide is removed from the atmosphere and is trapped in e.g. calcium carbonate (like shells), rocks, oceans etc.

Give the number of significant figures: 3.10 cm

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There are 3 significant figures.

Non-zero digits are always significant.

Any zeros between two significant digits are significant.

A final zero or trailing zeros in the decimal portion ONLY are significant.

What kind of glass is the following Si, O, Na, B, Al no plastic, no visible change, will shatters to high impact? 1. Pyrex Glass 2. Laminated soda-lime glass, 3. Ordinary Soda-Lime Glass, 4. Heat-tempered soda-lime glass?

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The kind of glass that is Si, O, Na, B, Al no plastic, no visible change, that will shatter to high impact is 1. Pyrex glass.

Answer:

Explanation:

When two continental plates of similardensities collide,
A. they remain level since densities in both plates are equal.
B. they both push back down into the mantle
C. one plate rides over the other one and forms a trench
D.they buckle upward and form mountains

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Answer:

D. They buckle upward and form mountains.

Explanation:

When two plates (either oceanic or terrestrial) converge and they are of similar density then they will crash into each other and form mountains. A great example of this is when India crashed into the Asian continent and the Himalayas were formed.

The force most responsible for holding the nucleus of an atom together is the:

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Strong nuclear force. I think that's the one one that holds the nucleons together.

This physiological event occurs to increase heat loss through the skin during Thermoregulation (a) Superficial Vasoconstriction (b) Decreased Sebaceous (c) Increased Sebaceous Gland Activity (d) Superficial Vasodilation

Answers

the only way i could see the difference

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