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saveliy_v [14]
3 years ago
15

Is this a chemical reaction or not? Explain why you think so (Be sure to answer both parts of the question)

Chemistry
1 answer:
Zigmanuir [339]3 years ago
4 0

Answer:

1. No 2. Yes 3. Yes

Explanation:

One is a physically. The other deals with an not reversible change

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X2O3 contain 32% of oxygen by mass , find the value of x.
denis-greek [22]
34g
Considering total mass as100g
I am sorry if it’s wrong
5 0
3 years ago
What is the final concentration of the solution produced when 225.5 mL of 0.09988-M solution of Na2CO3 is allowed to evaporate u
ikadub [295]

Explanation:

The given data is as follows.

       V_{1} = 225.5 mL,             V_{2} = 45.00 mL

       M_{1} = 0.09988 M,          M_{2} = ?

Therefore, formula to calculate final concentration will be as follows.

                  M_{1}V_{1} = M_{2}V_{2}

Putting the given values into the above formula as follows.

            M_{1}V_{1} = M_{2}V_{2}

   0.09988 M \times 225.5 mL = M_{2} \times 45.0 mL

                    M_{2} = 0.5 M

Thus, we can conclude that the final concentration of the given solution is 0.5 M.

4 0
3 years ago
Complete the sentences to explain what a similar treatment would predict for the effective nuclear charge on boron valence elect
dsp73

Answer:

ZcH's electrons = 5-2 = +3.

ZcH for inner electrons = -5 - 0 = +5.


Explanation:

Boron 1s² 2s² 2p

As, 2s ⇒ 2.58.

2p ⇒ 2.42.

Electrons = +3.

Greater than 2 cm = 0.35

Slightly greater than +3 .

8 0
3 years ago
The highest point on a wave is the ______ while the lowest point is the ____
Mkey [24]
The highest point = crest

lowest point = trough
4 0
3 years ago
Carboxyhemoglobin may be formed when a person inhales air that contains
elena-14-01-66 [18.8K]
Answer is none of the above
5 0
3 years ago
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