CHEMISTRY HIGH SCHOOL

How much energy is passed to the next trophic level in the food chain?

Answers

Answer 1

Answer:

Answer:

10%

Explanation:

Out of the original layer, only ten percent is transferred to the next

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The student's experiment most likely demonstrates how... A. earthquakes occur along a fault
B. new crusts move at midocean ridges
C. tectonic movements cause hotspot volcanism
D. mountains are created along cracks in Earth plates

Answers

The right answer for the question that is being asked and shown above is that: "D. mountains are created along cracks in Earth plates."The student's experiment most likely demonstrates how D. mountains are created along cracks in Earth plates

Answer:d

Explanation:test

When a substance dissolves, it undergoes a chemical change.
a. True
b. False

Answers

False.

Solubility is not a chemical property but rather it is a physical property. A physical property is one that can be observed or measured and does not change the composition or identity of a substance in the process.

When a substances dissolves, this is a change of its physical state and it is mostly reversible. For example, salt can dissolve in water to form a solution called brine. This does not alter the chemical nature of salt. When the water evaporates, salt is left behind in its original state or form. In other words, that was a physical change and it was completely reversible.

Based on the law of Conservation of Mass, what happens to the mass of a substance in a chemical change? A: the mass is always conserved B: The mass is either created or destroyed C: the reactant always has more mass D: the product always has more mass

Answers

Answer:

Explanation:

The amount of mass always stays the same, matter cannot be created nor destroyed, it can only change forms. Thus, the answer is A.

In a chemical reaction the total mass of all the substances taking part in the reaction remains the same. Also, the number of atoms in a reaction remains the same. Mass cannot be created or destroyed in a chemical reaction.

I hope this helps..

Could volume by displacement be used to determine the volume of a lump of rock salt? Explain would be nice

Answers

Yes it could, but you'd have to set up the process very carefully.
I see two major challenges right away:

1). Displacement of water would not be a wise method, since rock salt
is soluble (dissolves) in water. So as soon as you start lowering it into
your graduated cylinder full of water, its volume would immediately start
to decrease. If you lowered it slowly enough, you might even measure
a volume close to zero, and when you pulled the string back out of the
water, there might be nothing left on the end of it.

So you would have to choose some other fluid besides water ... one in
which rock salt doesn't dissolve. I don't know right now what that could
be. You'd have to shop around and find one.

2). Whatever fluid you did choose, it would also have to be less dense
than rock salt. If it's more dense, then the rock salt just floats in it, and
never goes all the way under. If that happens, then you have a tough
time measuring the total volume of the lump.

So the displacement method could perhaps be used, in principle, but
it would not be easy.

As the temperature of a substance decreases the average kinetic energy of its particles?

Answers

The average kinetic energy also decreases

Final answer:

When the temperature of a substance decreases, the average kinetic energy of its particles also decreases. This is because the temperature of a substance is proportional to the average kinetic energy of its particles. The slower the particles move, the lower the kinetic energy.

Explanation:

The question refers to the relationship between the temperature of a substance and the average kinetic energy of its particles. According to the kinetic-molecular theory, the temperature of a substance is proportional to the average kinetic energy of its particles. When the temperature of a substance rises, the particles vibrate more in solids or move more rapidly in liquids and gases, indicating an increase in kinetic energy. Conversely, if the temperature decreases, the kinetic energy also decreases, and the particles move more slowly.

For instance, when the temperature of a gas increases, its average kinetic energy increases, more molecules have higher speeds and fewer molecules have lower speeds. The distribution shifts towards higher speeds overall. If the temperature decreases, the opposite happens: the average kinetic energy decreases, more molecules have lower speeds and fewer molecules have higher speeds. The distribution shifts towards lower speeds overall.

Learn more about Kinetic Energy and Temperature

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Which two statements are true for both compounds and mixtures?A. Their particles are held together by chemical bonds.

B. They are made up of more than one type of atom.

O C. They can be separated into two or more elements.

O D. Their particles all have the same chemical formula.