1answer.
Ask question
Login Signup
Ask question
All categories
  • English
  • Mathematics
  • Social Studies
  • Business
  • History
  • Health
  • Geography
  • Biology
  • Physics
  • Chemistry
  • Computers and Technology
  • Arts
  • World Languages
  • Spanish
  • French
  • German
  • Advanced Placement (AP)
  • SAT
  • Medicine
  • Law
  • Engineering
iogann1982 [59]
3 years ago
12

You are working in your laboratory and decide to do some cleaning. You find a test tube with some brown substance congealed at t

he bottom. You take a piece of iron wool to scrub it out, but cannot remove it. You leave the iron wool in the test tube and set it aside to clean your beakers instead. You do not realize the test tube is next to the heater and after a few minutes, a brown gas starts smoking out of the test tube, followed by a reddish-brown gas. Upon observation, the iron wool is coated in a yellow-brown substance. You realize that the mystery substance was _________.
A. Argon (Ar)
B. Scandium (Sc)
C. Bromine (Br)
D. Iodide (I)
Chemistry
1 answer:
Anna [14]3 years ago
7 0

Answer:

  • <em>The mystery substance is</em> <u>C. Bromine (Br) </u>

Explanation:

<em>Argon (Ar) </em>is a noble gas. Whose freezing point is -189 °C (very low), thus it cannot be the frozen substance. Also, it is not reactive, thus is would have not reacted with iron. Hence, argon is not the mystery substance.

<em>Scandium (Sc) </em>is a metal from group 3 of the periodic table, thus is will not react with iron. Thus, scandium is not the mystery substance.

Both <em>bromine</em> and <em>iodine</em> are halogens (group 17 of the periodic table).

The freezing point of bromine is −7.2 °C, ​and the freezing point of iodine is 113.7 °C. Thus, both could be solids (frozen) in the lab.

The reactivity of the halogens decrease from top to bottom inside the group. Bromine is above iodine. Then bromine is more reactive than iodine.

Bromine is reactive enough to react with iron. Iodine is not reactive enough to react with iron.

You can find in the internet that bromine vapour over hot iron reacts  producing iron(III) bromide. Also, that bromine vapors are red-brown.

Therefore, <em>the mystery substance is bromine (Br).</em>

You might be interested in
I WILL MARK BRAINLISET FOR WHOEVER GETS THIS RIGHT! A pot is placed on a gas flame, and the water inside the pot begins to boil.
NNADVOKAT [17]

Answer:

B.     Warm water rises within the pot.?

Explanation

<em>There wasn't enough information given for me to safely determine the correct answer.</em>

8 0
3 years ago
Which of the following best compares the structure of carbohydrates and nucleic acids?
Serga [27]
I believe the best description comparing the structure of carbohydrates and nucleic acids would be A.
5 0
3 years ago
Read 2 more answers
12-How many elements are in the mixture pictured below?<br> A-7<br> O B-4<br> C-3<br> D-2
vovikov84 [41]

Answer:

C

Explanation:

3

Because you don't count the dots. You count how many colors there are. Which are Blue, Red, and Black.

Hope this helped!

4 0
3 years ago
Read 2 more answers
How would i write this balanced equation using the coefficients?
ivanzaharov [21]
Just the number 2 to get the cofficients
7 0
3 years ago
Help help help plsss
Olin [163]

Answer:

4.58×10^3

3.72×10^7

Explanation:

3.8×10^2 =380

+ 4.2×10^3=4200

= 4580 = 4.58×10^3

8 0
3 years ago
Other questions:
  • A tank has a total pressure of 285 kPa and contains Hydrogen, Oxygen, Carbon dioxide, and Neon. If Neon has a partial pressure o
    7·1 answer
  • What is the mass of 3.35 mol Hg(IO3)2? 1,700 g 1,840 g 1,960 g 2,110 g
    6·1 answer
  • Which of the following should be done when designing an experiment for a controlled scientific investigation?
    10·2 answers
  • Please help due tomorrow
    15·1 answer
  • explian how you would separate mixtures of nitrogen and oxygen gases given that their boiling points are -196c and 186c respecti
    10·1 answer
  • Which phase of matter has a fixed volume, but variable shape?
    8·2 answers
  • How many atoms are in .45 moles of P4010
    15·1 answer
  • Humanities !
    9·1 answer
  • Potassium secretion is linked to:________.
    14·1 answer
  • 10.Using the below valency chart, write chemical formula for aluminum oxide and
    13·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!