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4 years ago

I need help with this question .

Chemistry

2 answers:

Marina CMI [18]4 years ago

8 0

Answer:

Explanation:

The endocrine system is the collection of glands that produce hormones that regulate metabolism, growth and development, tissue function, sexual function, reproduction...(www.livescience.com)

salantis [7]4 years ago

7 0

Answer:

Explanation:

C is the best answer. The endocrine system releases and controls hormones, which are basically just signals sent through the body.

These hormones regulate homeostasis, which is how your body stays at regular levels / stays the same. It keeps your body at steady conditions.

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True or false: Most of the mass of an atom is found in the electron layers.

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I wanna say false, but I’m sorry if I’m wrong :(

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3 years ago

How does the ocean floor keep track of magnetic fields

fgiga [73]

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3 years ago

Read 2 more answers

Now moles: _(1, 2, or 3)_moles of H2 + _(1, 2, or 3)_ moles of O2 → _(1, 2, or 3)_moles of H2O

arsen [322]

Answer:

2H₂ + O₂ → 2H₂O.

Explanation:

For the reaction of water formation:

2H₂ + O₂ → 2H₂O.

It should apply the the law of conservation of mass that the no. of reactants atoms is equal to the no. of products atoms.

So, every 2.0 moles of H₂ react with 1.0 mole of O₂ to produce 2.0 moles of H₂O.

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3 years ago

What is the initial temperature (°C) of a system that has the pressure decreased by 10 times while the volume increased by 5 tim

Ede4ka [16]

Answer:

300K

Explanation:

Given pressure of the system decreased by 10 times which means $P_{2} =\frac{P_{1} }{10}$

Given the volume of the system increased by 5 times which means $V_{2} =5\times V_{1}$

Given final temperature $T_{2}=150K$

Let the initial temperature be $T_{1}$

We know that PV=nRT

As n and R are constant $\frac{PV}{T}=constant$

$\frac{P_{1}V_{1} }{T_{1}} =\frac{P_{2}V_{2}}{T_{2}}$

$T_{1} =\frac{P_1V_1}{P_2V_2} T_{2}$

$T_{1} =2\times T_{2}$

T1=300K

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3 years ago

What is the molarity of 20.0 grams of NaOH dissolved in 1.50 L of solution?

Mariulka [41]

Molarity = moles/litre
mol/L=g/(g/mol) (which is g times mols per g)

will give you mols then divide that by L to get mol/L

so
M=g x mol/g x L
M=(20 x 1 x 1.50)/39.997

6 0

3 years ago