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saveliy_v [14]
2 years ago
6

Use the picture below to answer the question. Comparing Wave A (blue) to Wave B (red), Wave B has a

Chemistry
1 answer:
fenix001 [56]2 years ago
6 0

Answer: B longer wave

Explanation:

because

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PLSSS HELP ANYONE ASAP!
algol [13]
B I hope it’s right I don’t really help a lot but yeah lol
7 0
2 years ago
What monatomic ions do selenium (z = 34) and phosphorus (z = 15) form? (type your answer using the format [cu]+ for cu+ and [cu]
Alex787 [66]
The answer:
for the monoatomic <span>selenium ions
</span>    -the ion charge of selenium is 2-, so the answer is [Se]2+ 
as for the monoatomic phosphorus ions
    -the ion charge of phosphorus is 3-, so the answer is [P]3- 
6 0
3 years ago
Calculate the molecular weight of a substance. In which the solution of this substance in the water has a concentration of 7 per
Eduardwww [97]

Answer : The molecular weight of a substance is 157.3 g/mol

Explanation :

As we are given that 7 % by weight that means 7 grams of solute present in 100 grams of solution.

Mass of solute = 7 g

Mass of solution = 100 g

Mass of solvent = 100 - 7 = 93 g

Formula used :  

\Delta T_f=i\times K_f\times m\\\\T_f^o-T_f=k_f\times\frac{\text{Mass of substance(solute)}\times 1000}{\text{Molar mass of substance(solute)}\times \text{Mass of water(solvent)}}

where,

\Delta T_f = change in freezing point

T_f^o = temperature of pure water = 0^oC

T_f = temperature of solution = -0.89^oC

K_f = freezing point constant of water = 1.86^oC/m

m = molality

Now put all the given values in this formula, we get

(0-(-0.89))^oC=1.86^oC/m\times \frac{7g\times 1000}{\text{Molar mass of substance(solute)}\times 93g}

\text{Molar mass of substance(solute)}=157.3g/mol

Therefore, the molecular weight of a substance is 157.3 g/mol

7 0
3 years ago
Which of the following compounds contains the lead (iv) ion?
Oliga [24]
Oxidation state of Pb in PbO2 is +4.
Oxidation state of Pb in PbCl2 is +2.
Oxidation state of Pb in Pb2O is +1.
Oxidation state of Pb in Pb4O3 is +6/4.

Hence option A. PbO2 is correct.
Hope this helps, have a nice day!
6 0
3 years ago
Read 2 more answers
Based on the Lewis/electron dot representation
timama [110]

Answer:

B or C think so

4 0
2 years ago
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