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Valentin [98]
3 years ago
15

Which of the following is an example of matter? Electricity Heat Light Water

Chemistry
1 answer:
Zina [86]3 years ago
6 0
Water is the correct answer.
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A chemist determined by measurements that 0.030 moles of barium participated in a chemical reaction. Calculate the mass of bariu
schepotkina [342]

Answer: 4.1 g of barium precipitated.

Explanation:

According to avogadro's law, 1 mole of every substance occupies 22.4 L at STP and contains avogadro's number 6.023\times 10^{23} of particles.

To calculate the moles, we use the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar Mass}}

Given : moles of barium = 0.030

Molar mass of barium = 137 g/mol

0.030=\frac{x}{137}

x= 4.1 g

Thus there are 4.1 g of barium that precipitated.

3 0
3 years ago
Which state of matter is most likely represented in the diagram shown below?
Yakvenalex [24]
To me it looks like gas.
Gas- CORRECT!
Solid- incorrect because if this were a depiction of a solid then the particles would be much much closer together.
Liquid - incorrect because the particles would be a little more crowded together.
Plasma- I do not think that this answer is correct because, even though the spacing of particles is similar to the spacing of particles in plasma, the particles in plasma are charged particles(nuclei (+) and electrons(-)). Therefore, because the diagram doesn't have the particles labeled with charges, I believe that Plasma cannot be the correct answer.

Any questions? 
7 0
3 years ago
Calculate the energy for one mole of photons (an einstein) for light absorbed at 6.90 × 102 nm.
Kay [80]
We know that:
f * λ = c 
<span>and
E = h*f
so,rearranging:
 </span> 
<span>E/h = C/λ 
given:
h = </span><span>6.90 × 10^2 nm

</span><span>substituting the values:

E = </span> C/λ<span> x h  
(c is the speed of light;that is 3x10^8 m/s)

</span>    = 3x10^8 x 6.626x10^-34 / 6.90 x10^7m x 6.022x10^23
Hence,
using calculator:
we get,
 E = 1.69 x 10^5 Joules
5 0
3 years ago
Read 2 more answers
Which particle has high rate of deposition
Svet_ta [14]

Answer:

a particle with jagged rough ends has a high rate of deposition

8 0
3 years ago
Read 2 more answers
If the concentration of glucose (C6H12O6) in blood is 0.9 g L–1, what will be the molarity of glucose in blood? (i) 5 M (ii) 50
lutik1710 [3]

Answer:

udruhrhfhhggghhhhhhhhghyyyggg

3 0
3 years ago
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