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3 years ago

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Can someone please help and list what each type of thing they are? (Element, Compound, Mixture of elements, Mixture of compounds

, Mixture of elements and compounds)

1 answer:

enot [183]3 years ago

5 0

1. B
2. C
3. E
4. D
5. A
6. B
7. A
8. E
9. A

Hope this helps!

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lead is a toxic metal that affects the central nervous system. a pbpb-contaminated water sample contains 0.0013 %pb%pb by mass.

Rus_ich [418]

0.0013% = 0.0013 g/100 ml water, or 1.3 mg/100 ml water

so for 145 mg, you need 145×100/1.3 = 11154 ml water or 11.154 L of water. Lead is a toxic metal that affects the central nervous system.

Extensively talking, the frightened gadget is organized into essential parts, the central nervous system(CNS) and the peripheral nervous system (PNS). The CNS is the processing center of the frame and includes the mind and the spinal cord. Both of these are protected through 3 layers of membranes referred to as meninges.

The principal anxious gadget is the frame's processing center. The brain controls most of the capabilities of the frame, inclusive of cognizance, movement, thinking, speech, and the five senses of seeing, listening to, feeling, tasting and smelling. The spinal twine is an extension of the mind.

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Learn more about central nervous system here:- brainly.com/question/2114466

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2 years ago

Mole ratios how can the coefficients in a chemical equation be interpreted

navik [9.2K]

Answer:

The coefficient in a balanced chemical equation indicates the mole ratio of both reactants and products.

Explanation:

For example lets consider the reation between Hydrogen and Oxygen to form water:

2H2 + O2 ----------------------- 2H2O

In this reaction, the coefficients of the balanced reaction can be transformed to Mole ratio according to Avogadro's Law which states that at standard temperature and pressure, equal volume of gases contain the same number of moles.

So the mole ratio for the above equation is the ratio of the coefficient:

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3 years ago

How many molecules of Ca are found in a sample with 0.2 mols?

DochEvi [55]

Answer:

$\boxed{1.2 \times 10^{23}\text{ atoms}}$

Explanation:

6.023 × 10²³ atoms of Ca are in 1 mol of Ca

$\text{No. of atoms} = \text{0.2 mol} \times \dfrac{6.023 \times 10^{23}\text{atoms }}{\text{1 mol }} = \mathbf{1.2 \times 10^{23}} \textbf{ atoms}}\\\\\text{There are }\boxed{\mathbf{1.2 \times 10^{23}} \textbf{ atoms}} \text{ atoms in 0.20 mol of Ca}$

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3 years ago

Nguyên tử nguyên tố sắt có 26e<br> a. Viết cấu hình e của sắt<br> b. Sắt thuộc nguyên tố s,p,d,f

vichka [17]

Answer:

1s2 2s2 2p6 3s2 3p6 3d6 4s2

Explanation:

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3 years ago

I need to do a project about carbon dioxide is there a safe way to capture it ??/

kramer

Yes. Exhale into a jar.
That's a hella ratchet way to capture CO2, but it works nonetheless

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3 years ago