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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 i reworks 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
02:06

Problem 8

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

Jennifer Hudspeth
Jennifer Hudspeth
Numerade Educator
00:30

Problem 9

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

David Collins
David Collins
Numerade Educator
02:18

Problem 10

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

Vasu Makani
Vasu Makani
Numerade Educator
00:43

Problem 11

What evidence supports the claim that chloride, ${Cl}^{-}$, does not cause the flame to have a color?
(A) Lithium chloride, LiCl, and sodium chloride, NaCl, have different colors.
(B) Ammonium chloride, ${NH}_{4} {Cl}$ , 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