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Living by Chemistry

Angelica M. Stacy

Chapter 4

Moving Electrons - all with Video Answers

Educators

Section 1

Flame Tests

00:58

Problem 1

How did the flame test provide evidence that specific atoms are present in compounds?

David Collins
David Collins
Numerade Educator
00:48

Problem 2

Explain what is responsible for the colors during a flame test.

David Collins
David Collins
Numerade Educator
00:26

Problem 3

Find out why fireworks are so colorful. What substances are used to produce the colors?

David Collins
David Collins
Numerade Educator
00:25

Problem 4

Predict the color of the flame for the compound sodium hydroxide, NaOH. Explain your reasoning.

David Collins
David Collins
Numerade Educator
00:47

Problem 5

Imagine that you were in charge of creating a red and purple fireworks display. Name two combinations of compounds you could use.

David Collins
David Collins
Numerade Educator
00:39

Problem 6

What evidence do you have from flame tests that copper is responsible for producing a flame with a blue-green color?

David Collins
David Collins
Numerade Educator
00:26

Problem 7

Does nitrate produce a colored flame? Explain your thinking.

David Collins
David Collins
Numerade Educator
00:23

Problem 8

Would it matter whether you did a flame test with sodium chloride, $\mathrm{NaCl}$ , in solid form or sodium chloride as an aqueous solution? Explain.

David Collins
David Collins
Numerade Educator
00:30

Problem 9

What flame colors would be produced by these compounds? Explain your choices.
a. $\mathrm{Na}_{2} \mathrm{CO}_{3} \quad$ b. $\mathrm{Ba}(\mathrm{OH})_{2} \quad$ c. $\mathrm{KOH} \quad$ d. $\mathrm{K}_{2} \mathrm{CO}_{3} \quad$ e. BaO

David Collins
David Collins
Numerade Educator
00:33

Problem 10

If two chemical samples both produce an orange flame upon testing, which statement is true?
(A) h e two samples contain identical compounds.
(B) h e samples both contain chlorine atoms.
(C) h e samples both contain calcium atoms.
(D) h e samples both contain potassium atoms.
(E) h e samples contain different compounds.

David Collins
David Collins
Numerade Educator
00:43

Problem 11

What evidence supports the claim that chloride, $C 1^{-},$ does not cause the flame to have a color?
(A) Lithium chloride, LiCl, and sodium chloride, NaCl, have different colors.
(B) Ammonium chloride, $\mathrm{NH}_{4}$,Cl, does not cause the flame to have a color.
(C) Sodium chloride, NaCl, and sodium nitrate, $ NaNO_{3}$ both produce flames with a yellow-orange color.
(D) All of the above.

David Collins
David Collins
Numerade Educator