CHEMISTRY MIDDLE SCHOOL

A roller coaster track is 3,000 meters long. It takes 100 seconds to travel once around the roller coaster. What is the average speedof the roller coaster? Is the velocity constant throughout the trip Explain.
A roller coaster track is 3,000 meters long. It takes - 1

Answers

Answer 1
Answer: the speed is 30m/s. no the velocity could differ as the direction of roller coaster changes. 
Answer 2
Answer: The roller coaster went 200 miles on the rollcoster

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Explain how kidneys remove waste from the body and keep fluids and salts in balance

Answers

The fluid levels in  the body must be balanced and a normal blood pressure must be maintained. An area in the brain, the hypothalamus, constantly watches the amount of water in the blood. When the brain discovers too much water in the blood, the hypothalamus releases a less  amount of a specific hormone. This lets the kidneys know  to return less water to the blood and to increase the quantity of urine that is excreted.

How are chemical names andformulas related?

Answers

the chemical name tells what formula.

Metalloids are border of metals and non metals why​

Answers

Answer:

Metalloids are called the border of metals and non metals.

Explanation:

They show some properties of metals and some properties of non metals.

Answer:

Metalloids exhibit metal and non-metal properties.

Explanation:

Some metals such as Boron and silicons and not necessarily a metal, nor are they a gas.

What are chemical properties of water?

Answers

The chemical property of water is oxidane. Water is tasteless, odorless at a normal temperature. Etc.
Water is covalently bonded (H-O-H). All simple covalent molecules such as these have low melting and boilong points. Water does not conduct electricity. It reacts with a lot of elements, especially vigorously with alkali metals

What is the result of an uncontrolled chain reactiona small explosion
a small implosion
a large explosion
a large implosion

Answers

A chain reaction is a nuclear reaction that occurs when sufficient unstable nuclei are present so that when one splits (decays), its products hit other unstable nuclei, causing them to decay and initiating a chain reaction.

If this reaction goes uncontrolled, a massive explosion occurs. Such a reaction is the type that went uncontrolled when nuclear bombs were dropped over Hiroshima and Nagasaki in World War II. A chain reaction is much like dominoes all in a row; when one goes down, they all go down in order. The only way to block the chain reaction is to pull out a domino or to block the fall so the "chain" is broken.

The amount of fissionable material needed to accomplish a spontaneous chain reaction is called the critical mass. The critical mass for U-235 is about 1 kg. This explosive fission process takes place quickly, and an incredible amount of energy is released when it occurs.

So it would be C.

the answer for this is c

Is neon element a metal nonmetal or metalloid

Answers

Neon is considered a "nonmetal inert gas".
Neon has the formula "Ne". It has atomic number of 10, which means it has 10 electrons configured as follows: 1s2, 2s2, 2p6. Based on this, neon is monoatomic and stable in standard form.
Neon is a colorless gas that exhibits an orange-red glow when placed in an electric field.
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