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3 years ago

Which formula represents a polar molecule? (1) Br2 (3) CH4 (2) CO2 (4) NH3

1 answer:

8 0

The formula representing a polar molecule is (4) NH3, for the difference in electronegativity of Nitrogen (N) and Hydrogen (H) is large, and thus it is polar.

Hope this helps~

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Which of the following best describes the motion of the particles in a piece of steel?

sergejj [24]

<span>Steel is a solid at standard temperature and pressure conditions. For a solid, the particles are found to be oscillating about a fixed point. However, steel is a metal so this holds true for the positively charged nuclei of the particles. Just like any other metal, the electrons are free to move about, allowing steel to exhibit its properties such as heat conduction and electricity conduction. The reason the positive particles are fixed in place is because the intermolecular forces are very strong in solids, the strongest out solids, liquids and gases.</span>

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3 years ago

A saline solution used in intravenous drips for patients who cannot take oral fluids contains 0.92% (w/v) NaCl in water. How man

Effectus [21]

Answer:

2.3 g NaCl

Explanation:

Given the concentration of the NaCl solution = 0.92% (w/v)

It means that 0.92 g of NaCl is present in 100 mL of water.

Thus,

100 mL of water contains 0.92 g of NaCl

To find, amount of NaCl in 250 mL of water

So,

1 mL of water contains $\frac {0.92}{100}\ g$ of NaCl

250 mL of water contains $\frac {0.92}{100}\times 250\ g$ of NaCl

<u>2.3 g of NaCl is present in 250 mL of this solution.</u>

8 0

3 years ago

Pls help I will give brainlist

frez [133]

Answer:

I would say B but i am not sure hope it helps

Explanation:

5 0

3 years ago

the volume of a cylindrical tin can with a top and a bottom is to be 16Ï cubic inches. if a minimum amount of tin is to be used

Hunter-Best [27]

Answer:

The required height of the tin can is given by the height at the minimum value of the surface area function of the tin can

The height of the tin can must be 4 inches

Reason:

The given information on the tin can are;

Volume of the tin can = 16·π in.³

The amount of tin to be used = Minimum amount

The height of the can in inches required

Solution;

Let h, represent the height of the can, we have;

The surface area of the can, S.A. = 2·π·r² + 2·π·r·h

The volume of the can, V = π·r²·h

Where;

r = The radius of the tin can

h = The height of the tin can

Which gives;

16·π = π·r²·h

16 = r²·h

Which gives;

When the minimum amount of tin is used, we have;

Therefore;

4·π·(r³ - 8) = r² × 0

r³ = 8

r = 2

The radius of the tin can, r = 2 inches

The

The height of the tin can, h = 4 inches

Learn more here:

brainly.com/question/14316282

Explanation:

8 0

3 years ago

3. How many formula units of NaOH are in 0.87 moles?

Lady_Fox [76]

Answer: 1 mole of H2O= about 1/3 of a cup (18 mL). It is helpful ... 6.02 x 1023 H2O molecules. = 6.02 x 1023 NaCl formula unit. 1 mole C. 1 mole H2O. 1 mole

Explanation:

5 0

3 years ago