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Shtirlitz [24]
4 years ago
9

What are the missing coefficients for the skeleton equation below? cr(s) + fe(no3)2(aq) → fe(s) + cr(no3)3(aq)?

Chemistry
1 answer:
strojnjashka [21]4 years ago
8 0
SThe  missing   coefficient  for  the  skeleton   equation  below  is  as  follows

skeleton   equation

Cr(s)  +  Fe(No3)2(aq)  ------> Fe (s)   +  Cr(NO3)3  (aq)
the  missing  coefficient  are  is   as  follows

 2 Cr(s)   +  3  Fe(NO3)2  ---> 3 Fe (s)  +  2 Cr(NO3)3

This  is  obtained   by  making  sure  all  the   molecules  are  balanced  in  both  sides
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A piece of unknown solid substance weighs 437.2 g, and requires 8460 J to increase its temperature from 19.3 °C to 68.9 °C.What
Pachacha [2.7K]

Answer:

0.3832

Explanation:

Givens

m = 437.2 grams

c = ?

delta t = 69.8 - 19.3

H = 8460 J

Formula

H = m*c*Δt

Solution

8460 = 437.2 * c * (69.8 - 19.3)

8460 = 437.2 * c * 50.5

8460 = 22078.6 * c

c = 8460 / 22078,6

c = .3832 J / (oC * gr)

3 0
3 years ago
Which properties do all solids share?
Lera25 [3.4K]

Answer:

c

Explanation:

because when you hold a solid in your hand does it move does it shift no it stays the same so it doesn't take the form of the container it's in cuz that's a liquid.

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3 years ago
Show your work and include answer with units.<br><br> How many atoms in 55 grams of magnesium
Georgia [21]

Answer:

1.38 x 10^{24} atoms

Explanation:

To get grams to atoms/molecules/particles we need to first convert grams > moles > atoms. This also applies in the other direction, where you have moles as that stepping stone.

Some key information we need:

Magnesium's molar mass= 24g/mol

Avogadro's Number= 6.022 x 10^{23} atoms

Where there is 1 mol per 6.022 x 10^{23}  atoms

*This maybe be something you want to memorize.

Grams to moles using molar mass , then to atoms using avogadro's number.

55g Mg x \frac{1 mol}{24g/mol} x \frac{6.022 x 10^{23} atoms }{1 mol} = 1.38 x 10^{24} atoms

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3 years ago
What happens to the number of waves when you decrease the wavelength?
Keith_Richards [23]

C

Decreasing the wavelength increases the frequency of a wave and vice versa, as long as the energy of the wave remains constant.

Explanation:

The energy of a wave is given by the formula;

E= hf

Whereby;

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h = Plank’s constant

f = frequency

Remember that f can be also represented as;

¹/ λ

Whereby;

λ = wavelength

Wavelength and frequency are therefore inversely proportional.

Decreasing the wavelength increases the frequency of a wave and vice versa, as long as the energy of the wave remains constant.

Learn More:

For more on frequency and wavelength of waves check out;

brainly.com/question/13451801

brainly.com/question/9501542

brainly.com/question/14068647

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6 0
4 years ago
I need the name and classification for Na2O please.
nika2105 [10]

Answer:

Sodium oxide | Na2O - PubChem.

Synonyms: Sodium oxideDisodium oxide1313...

Chemical Safety: Laboratory Chemical Safety ...

PubChem CID: 73971

Molecular Formula: Na2O

Explanation:

3 0
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