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Paul [167]
3 years ago
15

BEST ANSWER = BRAINIEST !1.What will the weather most likely be like the day a cold front arrives?

Chemistry
1 answer:
nirvana33 [79]3 years ago
7 0
1.B
2.C
3.C
4.D
5.D
I hope this helps!
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PLS HELP.
Lesechka [4]

Answer:

1. 57.5%

2. 27.89 g

Explanation:

1. Determination of the percentage of sodium in sodium hydroxide.

Molar mass of NaOH = 23 + 16 + 1 = 40 g/mol

Mass of Na in NaOH = 23 g

Percentage of Na = mass of Na / Molar mass of NaOH × 100

Percentage of Na = 23/40 × 100

Percentage of Na = 57.5%

2. Determination of the mass of sodium in 48.5 g of sodium hydroxide.

Molar mass of NaOH = 23 + 16 + 1 = 40 g/mol

Mass of Na in NaOH = 23 g

Total mass of NaOH = 48.5 g

Mass composition of Na = mass of Na / Molar mass of NaOH × Total mass

Mass composition of Na = 23/40 × 48.5

Mass composition of Na = 27.89 g

6 0
3 years ago
Help please with this tough question
Alla [95]

Answer:

  1. option B
  2. option A

Explanation:

please mark me as brainliest ❤️

5 0
3 years ago
Points D and E are midpoints of the sides of triangle ABC. The perimeter of the triangle is 48 units. What is the value of t?
weeeeeb [17]
     If points E and D are midpoints of triangle ABC, then the perimeter of the triangle is:AB + BC + CA = 48, or:
3 t + 3 t + 4 t + 4 t + 7 t + 6 = 4821 t = 48 - 621 t = 42t = 42 : 21t = 2Answer: A.  2.

3 0
3 years ago
Read 2 more answers
Describe the number of signals and their splitting in the 1H NMR spectrum of (CH3)2CHOCH3.
yanalaym [24]

Answer:

d. 3 signals: a singlet, a doublet, and a septet

Explanation:

In this case, we can start with the structure of (CH_3)_2CHOCH_3 . When we draw the molecule we will obtain <u>2-methoxypropane</u> (see figure 1).

In 2-methoxypropane we will have three signals. The signal for the CH_3  groups in the left, the CH  and the CH_3  in the right. Lets analyse each one:

-) CH_3  in the right

In this carbon, we dont have any hydrogen as neighbors. Therfore we will have <u>singlet</u> signal in this carbon.

-) CH

In this case, we have 6 hydrogen neighbors ( the two methyl groups in the left). So, if we follow the <u>n + 1 rule</u> (where n is the amount of hydrogen neighbors):

multiplicity~=~n+1~=~6~+~1~=~7

For this carbon we will have a <u>septet</u>.

-) CH_3  in the left

In this case we have only 1 hydrogen neighbor (the hydrogen in CH ). So, if we use the n+1 rule we will have:

multiplicity~=~n+1~=~1~+~1~=~2

We will have a doublet

With all this in mind the answer would be:  

<u>d. 3 signals: a singlet, a doublet, and a septet </u>

<u />

See figure 2 to further explanations

4 0
3 years ago
HELP NOW BRAINLIST AND 15 POINTS!!!!!! PLEASE HELPPP​
ycow [4]

Answer:

sis why u doing school at night Lol.Save it for me tomorrow

3 0
3 years ago
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