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
Alexxx [7]
3 years ago
14

Which mineral leaves a green-black powder when rubbed against an unglazed porcelain plate

Chemistry
1 answer:
solong [7]3 years ago
4 0

<u>Answer:</u>

Pyrite leaves behind a green-black streak when it is rubbed against an unglazed porcelain plate as a part of the streak test process.

<u>Explanation:</u>

Different minerals produce different coloured streaks when rubbed against a white ceramic or porcelain streak plate. This streak test is done to identify the mineral and distinguish the same from other minerals that look similar in colour and texture.

It must be ensured that the test is done on clean and fresh specimens of the mineral and that there must be no contaminants. Pyrite specimens are usually brass-yellow colour but it leaves a green-black streak when the streak test is done.

You might be interested in
___________________ is a substance that reduces surface tension (Ex. Soap)
Daniel [21]

Answer:

Surfactant. Surfactant, also called surface-active agent, substance such as a detergent that, when added to a liquid, reduces its surface tension, thereby increasing its spreading and wetting properties

Explanation:

6 0
3 years ago
When balancing redox reactions under basic conditions in aqueous solution, the first step is to:________.
natta225 [31]

Answer:

When balancing redox reactions under basic conditions in aqueous solution, the first step is to balance oxygen.

Explanation:

Oxidation-reduction reactions or redox reactions are those in which an electron transfer occurs between the reagents. An electron transfer implies that there is a change in the number of oxidation between the reagents and the products.

The gain of electrons is called reduction and the loss of electrons oxidation. That is to say, there is oxidation whenever an atom or group of atoms loses electrons (or increases its positive charges) and in the reduction an atom or group of atoms gains electrons, increasing its negative charges or decreasing the positive ones.

The oxidation and reduction half-reactions, in a basic medium, adjust the oxygens and hydrogens as follows:

In the member of the half-reaction that presents excess oxygen, you add as many water molecules as there are too many oxygen. Then, in the opposite member, the necessary hydroxyl ions are added to fully adjust the half-reaction. Normally, twice as many hydroxyl ions, OH-, are required as water molecules have previously been added.

In short, you first adjust the oxygens with OH-, then you adjust the H with H₂O, and finally you adjust the charge with e-

So, <u><em>when balancing redox reactions under basic conditions in aqueous solution, the first step is to balance oxygen.</em></u>

3 0
3 years ago
Why is there a bond between the ions in potassium chloride
yKpoI14uk [10]

Answer:

Explanation:

When the two atoms are in contact, potassium transfers its outer electron to chlorine which readily accepts it, resulting in both atoms achieving a state of eight outermost electrons. With this electron transfer, the ionic bond in KCl is formed.

Hope this helped!!!

6 0
3 years ago
Brittany pedaled her bicycle quickly on a level surface. When she quit pedaling and cousted, the bicycle slowed and
san4es73 [151]
A. It was given off due to friction
8 0
3 years ago
Give some examples of what are sand good for explaining is involved!
Ghella [55]

Explanation:

The definition of a god is an image, person or thing that is worshiped, honored or believed to be all-powerful or the creator and ruler of the universe. An example of a god is Ganesha, a Hindu diety.

7 0
2 years ago
Other questions:
  • In a balloon with a volume of 21.55 cups, what is the volume of this balloon in L?
    12·1 answer
  • Draw the major organic product of the regioselective reaction of 2-methyl-2-pentene with H2O in presence of H2SO4. You do not ha
    8·1 answer
  • Please calculate the mixed volume (Vmix) when 0.300 mol of ethanol and 0.200 mol of water are mixed. Hint: The partial molar vol
    14·1 answer
  • You are given an aqueous solution and are asked to analyze it for the presence (or absence) of Ag+(aq), Ca2+(aq), and/or Hg2+(aq
    10·1 answer
  • Why are there 2 bonds holding the oxygen atoms together?​
    14·1 answer
  • I didn’t study for this lol if your answer correct I’ll mark ur answer brainliest
    15·1 answer
  • What is the mass of 8.87 x 10^24 atoms of carbon?<br><br> PLEASE HELP!!
    7·1 answer
  • At which volume of base added was all the acid neutralized?
    10·1 answer
  • What is the specific heat of a substance if 1450 calories are required to raise the temperature of a 240g sample by 20℃?
    15·1 answer
  • 7. Explain how excitatory and inhibitory actions of neurotransmitters are different.
    10·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!