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umka2103 [35]
3 years ago
11

1. What wavelengths are associated with the light color observed in each metal’s flame test?

Mathematics
1 answer:
Dafna1 [17]3 years ago
7 0

Answer:

Here's what I get

Step-by-step explanation:

1. Wavelengths

\begin{array}{lcc}\textbf{Salt} & \textbf{Flame Colour} & \mathbf{\lambda} \textbf{/nm}\\\text{KCl} & \text{violet} & 423\\\text{LiCl} & \text{red} & 701\\\text{CuCl}_{2} & \text{blue-green} & 492\\\text{NaCl} & \text{ orange-yellow} & 590\\\end{array}

2. Identity of unknown

Don't know. You haven't told us its flame colour.

3. Light filters

You could probably filter lithium light. It is almost pure red.

The other elements emit light of mixed colours. It would be difficult to filter them with filters of a single wavelength.

4. Fireworks chemicals

For a red explosion followed by a green one, the engineer should use LiCl and CuCl₂.

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there are 9 boys in a class of 14 students. a)what is the ratio of boys to girls. b) what is the ratio of girls to all students
ElenaW [278]

Answer:

a). 9 to 5

b). 5 to 14

Step-by-step explanation:

If there are 9 boys then there are 5 girls because 14 - 9 = 5.

So, there are 5 girls of 14 students in the class.

4 0
3 years ago
8x + 34. What does X equal
rosijanka [135]

Answer: x=-4.25

Step-by-step explanation:

First you put it in to y= mx+b form.

0=8x+34

Then you subtract 34 from both sides

-34=8x

Then you divide 8 from both sides

Leaving you with

x=-4.25

4 0
3 years ago
Solve the following pair of equations by elimination method: x+y=4, 2x+y=3​
allsm [11]

Answer:

x = 1

y = 5

Step-by-step explanation:

x + y = 4 __ (1)

2x + y = 3 __ (2)

equation (1) x 2, (2) x 1

2x + 2y = 8

2x + y = 3

0  + y = 5

y= 5 (ANS)

x + y = 4

x + 5 = 4

x = 5 - 4

x = 1 (ANS)

I HOPE MY ANSWER IS CORRECT IF NOT I APOLOGIZE.

5 0
2 years ago
Write the expression in complete factored<br> form.<br> 5(a - 5) + a(a -5) =
balu736 [363]

Answer:

a^2 - 25

Step-by-step explanation:

5(a-5) turns into 5a - 25

a(a-5) turns into a^2 - 5a

added together, it's a^2 - 25

8 0
3 years ago
There are 26 students in tour class. There are 4 more girls than boys. Use a system of linear equations to find how many boys ar
puteri [66]
<h3>Answer:  B+B+4=26 2B=22 B=11 So then,  G=11+4 G=15   Step-by-step explanation: </h3>
5 0
3 years ago
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