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4 years ago

Is sand macromolecule or network solid? Thank you

1 answer:

3 0

A macromolecule is a molecule with lots and lots of atoms. (i.e. protein, nucleic acid...)
A network solid is is a chemical compound where the atoms are "bonded by covalent bonds in a continuous network extending throughout the material."
A single grain of sand consists of, on average, ~50,000,000,000,000,000,000 atoms.
That's A LOT.
However, these atoms do bond in network covalent bonds.
But that means it's a covalent network solid.
The short answer is that sand is both a macromolecular substance as well as a covalent network solid, so I would go with it's macromolecular but you can interpret that the way you want.

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Which structure of the cell controls what goes in and comes out of the cell?

LenKa [72]

The Cell Membrane.

The Cell Membrane wraps around the entire cell and only allows certain things to pass through, blocking out potentially harmful things from the organelles within the cell.

Hope this helps!

7 0

3 years ago

375 mL of a 0.88 M potassium hydroxide solution is added to 496 mL of a 0.76 M cesium hydroxide solution. Calculate the pOH of t

AysviL [449]

Answer:

pOH of resulting solution is 0.086

Explanation:

KOH and CsOH are monoacidic strong base

Number of moles of $OH^{-}$ in 375 mL of 0.88 M of KOH = $\frac{0.88\times 375}{1000}moles$ = 0.33 moles

Number of moles of $OH^{-}$ in 496 mL of 0.76 M of CsOH = $\frac{0.76\times 496}{1000}moles$ = 0.38 moles

Total volume of mixture = (375 + 496) mL = 871 mL

Total number of moles of $OH^{-}$ in mixture = (0.33 + 0.38) moles = 0.71 moles

So, concentration of $OH^{-}$ in mixture, $[OH^{-}]$ = $\frac{0.71}{871}\times 1000M=0.82M$

Hence, $pOH=-log[OH^{-}]=-log(0.82)=0.086$

8 0

3 years ago

I WILL GIVE BRAINLIEST!!!!!

Alexxx [7]

HNO₃ + H₂S → S + NO + H₂O

Assign Oxidation Number:

L.H.S R.H.S
N in HNO₃ = +5 +2 = N in NO
S in H₂S = -2 0 = S in S

Write Half cell Reactions:
Reduction Reaction:
3e⁻ + HNO₃ → NO -------(1)
Oxidation Reaction:
H₂S → S + 2e⁻ -------(2)

Multiply eq. 1 with 2 and eq. 2 with 3 to balance electrons.

6e⁻ + 2 HNO₃ → 2 NO

3 H₂S → 3 S + 6e⁻
Cancel e⁻s,
______________________________

2 HNO₃ + 3 H₂S → 2 NO + 3 S + H₂O

Balance Oxygen Atoms by multiplying H₂O with 4, Hydrogen atoms will automatically get balance.

2 HNO₃ + 3 H₂S → 2 NO + 3 S + 4H₂O

4 0

4 years ago

Calculate the mass-to-mass ratio of 25.0 g of salt in 105 g of water. Work must be shown in order to earn credit.

Sveta_85 [38]

Answer:

0.23

Explanation:

It is known that, the mass to mass ratio of the salt to water

= (mass of salt / mass of water)

= (25.0 g / 105.0 g)

= 0.23

So, the answer is 0.23

4 0

3 years ago

What is the name of the people who hid the Dead Seas Scrolls. When did they live at Qumran?

Shkiper50 [21]

It was named the Qumran seas scrolls.

3 0

3 years ago