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3 years ago

Select the two statements that are TRUE about compounds

Chemistry

1 answer:

patriot [66]3 years ago

4 0

a) a compound always contains at least 2 elements

is the answer

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A fungus like the one that causes athletes foot causes disease by? A producing allergies B spreading spores c absorbing nutrient

goblinko [34]

I think the answer is B spreading spores.

6 0

3 years ago

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A hypothetical AX type of ceramic material is known to have a density of 3.55 g/cm3 and a unit cell of cubic symmetry with a cel

postnew [5]

Explanation:

For AX type ceramic material, the number of formula per unit cells is as follows.

$\rho = \frac{n'(A_{c} + A_{A})}{V_{C}N_{A}}$

or, $n' = \frac{\rho a^{3}N_{A}}{(A_{c} + A_{A})}$

where, n' = no. of formula units per cell

$A_{c}$ = molecular weight of cation = 90.5 g/mol

$A_{a}$ = molecular weight of anion = 37.3 g/mol

$V_{c}$ = volume of cubic cell = 3.55 $g/cm^{3}$

a = edge length of unit cell = $3.9 \times 10^{-8} cm$

$N_{A}$ = Avogadro's number = $6.023 \times 10^{23}$

$\rho$ = density = 3.55 $g/cm^{3}$

Now, putting the given values into the above formula as follows.

$n' = \frac{\rho a^{3}N_{A}}{(A_{c} + A_{A})}$

= $\frac{3.55 g/cm^{3} \times (3.9 \times 10^{-8})^{3} \times 6.023 \times 10^{23}}{(90.5 + 37.3)}$

= 0.9

= 1 (approx)

Therefore, we can conclude that out of the given options crystal structure of cesium chloride is possible for this material.

3 0

3 years ago

Freé point<br><img src="https://tex.z-dn.net/?f=%20%5C%3A%20%20%5C%3A%20%20%5C%3A%20%20%5C%3A%20%20%5C%3A%20%20%5C%3A%20" id="Te

gladu [14]

Answer

Tq so much.

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3 years ago

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What is the wavelength of a microwave with a frequency of 2450 mhz

JulsSmile [24]

Answer:

See below

Explanation:

The way to calculate this

speed of light = wavelength * frequency

3 x 10 ^8 m/s = wavelength * 2450000000 Hz

wavelength = .12245 meters

= 1.2245 x 10^-1 Meters

6 0

2 years ago

Questions 3,4,5<br> Brainlist

Diano4ka-milaya [45]

Answer:

3. 126.02 g of H₂S and 1109.2 g of NaI

4. 364.5g of Mg

5. 361.08 g of MgSO₄ and 108 g of H₂O

Explanation:

3. This is the reaction

2HI + Na₂S → H₂S + 2NaI

7.4 moles of HI react, so, ratio is 2:1 with H₂S and 2:2 with NaI

We would produce the same moles of NaI, 7.4 moles and the half of moles, of H₂S (7.4 /2) = 3.7 moles

Let's convert the moles to mass (mol . molar mass)

3.7 mol H₂S . 34.06 g/mol = 126.02 g

7.4 mol NaI . 149.9 g/mol = 1109.2 g

4. The balanced reaction is this:

3Mg + N₂ → Mg₃N₂

Ratio is 1:3. Therefore 1 mol of Mg₃N₂ were produced by 3 moles of Mg.

So, 5 moles of Mg₃N₂ would have been produced by 15 moles of Mg. (5 .3)

Let's convert the moles to mass (moles . molar mass)

15 mol . 24.30 g/mol = 364.5 g

5. The reaction is: H₂SO₄ + Mg(OH)₂ → MgSO₄ + 2H₂O

Ratios are 1:1 and 1:2, between sulfuric acid and the products.

If I have 3 moles of acid, I would produce 3 moles of magnessium sulfate and 6 moles of water (3 .2)

Let's convert the moles to mass

3 mol . 120.36 g/mol = 361.08 g of MgSO₄

6 mol . 18 g/mol = 108 g of H₂O

8 0

4 years ago