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3 years ago

6

The hypothetical elements shown here (figures a–d) do not include hydrogen or helium. Which element would you expect to bond cov

alently with an oxygen atom to form a two-atom molecule?

1 answer:

Marizza181 [45]3 years ago

4 0

The answer is "Figure a" i did it on plato lol

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If an atom has 15 protons, 11 neutrons, and 16 electrons, what is the atom's electrical charge?

Evgesh-ka [11]

Answer

-3 because there are 3 more electrons than protons. Hope this helps!

Explanation:

4 0

3 years ago

Read 2 more answers

Why does the pink color, which forms at the point where NaOH comes into contact with the solution (HCl) in the flask, disappear

Novay_Z [31]

Answer is: because pH value of solution is changing.
Balanced chemical reaction: NaOH(aq) + HCl(aq) → NaCl(aq) + H₂O(l).
pH of sodium hydroxide solution is above seven (basic), when solution of hydrochloric acid is added, pH slowly dropping until it became neutral solution (pH is equal seven) and that is endpoint of titration.

4 0

3 years ago

1.505 times 10^23 Na atoms

dybincka [34]

5.75g

Explanation:

Given parameters:

Number of atoms = 1.505 x 10²³atoms

let us find the number of moles and mass of this atom.

Solution:

The mole is convenient unit for reporting measurements in chemistry. It allows us to make mathematical calculations:

one mole of substance contains 6.02 x 10²³atoms

Number of moles of Na given = $\frac{1.505 x 10^{23} }{6.02 x 10^{23} }$ = 0.25moles

Mass of Na atom given = number of moles x molar mass

Molar mass of Na= 23g/mole

Mass of Na = 0.25 x 23 = 5.75g

learn more:

Number of moles brainly.com/question/1841136

#learnwithBrainly

8 0

3 years ago

A chemical engineer must calculate the maximum safe operating temperature of a high-pressure gas reaction vessel. The vessel is

TiliK225 [7]

Answer:

Maximum safe operating temperature = 450 °C

Explanation:

First, the volume of the cylindrical vessel is determined using the formula:

v = πr²h

Radius, r, of stainless steel vessel = width or diameter / 2

r = 39.0 cm / 2 = 19.5 cm

height of vessel = 46.8 cm

volume of cylinder = 22/7 × 19.5² × 46.8 = 55929.343 cm³ = 0.05593 m³

Using the ideal gas equation to calculate the maximum safe temperature

PV = nRT

pressure, P = 5.30 MPa = 5.30 × 10⁶ Pa

R = 8.314 J/mol.K

n = mass of gas/ molar mass of gas

molar mass of SF₆ = 146 g/mol

mass of Sf₆ = 7.20 kg = 7200 g

n = 7200/146 = 49.315 moles

T = PV/nR

T = (5.30 × 10⁶ × 0.05593) / (49.315 × 8.314)

T = 722.98 K

T in °C = 714.98 - 273.15 = 449.83 °C

Therefore, maximum safe operating temperature = 450 °C

5 0

3 years ago

How many electrons are drawn for a electron dot structure for carbon?

koban [17]

Answer:

6

Explanation:

yeah i’m pretty sure 2 in the first shell and 4 in the second

5 0

2 years ago