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
Fed [463]
3 years ago
5

Workers in coal mines use battery operated torch lights instead of lanterns. What is the reason?

Chemistry
1 answer:
weqwewe [10]3 years ago
3 0

it is much more efficient and environmentally conscious.

You might be interested in
A. Clearly draw the Lewis structure for the PBr4- ion. Show your math where
Nataliya [291]

Answer:

   Br

    |

Br-P-Br

    |

   Br

Explanation:

To calculate the valance electrons, look at the periodic table to find the valance electrons for each atom and add them together. P is in column 5A, so it has 5, Br is in column 7A, so it has 7 (multiply by 4 since there are 4 Br atoms to give 28) and there is a 1- charge, so add one more electron. 5+28+1=34, so there are 34 electrons to place. P would be the central atom, so place it in the middle. Place each Br around the P (as shown above) with a a single line connecting it. Each line represents 2 electrons, so 8 total have been place, leaving 26 remaining. Place 6 electrons around each Br (2 on each of the unbonded sides), which leaves 2 electrons remaining. The remaining pair of unbound electrons will be attached to the P between any two Br atoms. Phosphorus doesn't have to follow the octet rule, so it actually ends up with 10 valance electrons.

4 0
2 years ago
Read 2 more answers
Dalton's contribution was different from thatof the ancient Greek who postulated the existence of atoms. Point out the differenc
ELEN [110]

Answer: Democritus atomic theory is the ancient theory that describes the nature of matter in terms of atoms whereas Dalton atomic theory is a modern scientific theory that describes the nature of matter in terms of atoms. According to Dalton's theory, atoms are identically same, but Democritus had no idea about it. Atoms are never created nor destroyed, they just rearrange.

Explanation:

4 0
3 years ago
2Mg + O2à MgO For this unbalanced chemical equation, what is the coefficient for oxygen when the equation is balanced? A. 1 B. 2
Vikki [24]

Answer:

The answer to your question is the letter A. 1

Explanation:

Unbalanced chemical reaction

                      Mg  +  O₂  ⇒  MgO

               Reactants    Elements    Products

                       1            Magnesium       1

                       2           Oxygen              1

Balanced chemical reaction

                      2Mg  +  O₂  ⇒  2MgO

              Reactants    Elements    Products

                       2           Magnesium       2

                       2           Oxygen             2

Conclusion

The coefficients of the balanced equation are 2, 1, 2

7 0
3 years ago
Read 2 more answers
Use the portion of the periodic table shown below to answer the questions
leva [86]

Answer:

Part 1:sodium

rubidium

Part 2: protons neutrons and electrons are all 12

The number of protons is equal to the no. of neutrons from the electronic arrangement of magnesium and the no. of electrons is got from the atomic no. of magnesium

8 0
2 years ago
1.As with any grid, the periodic table has ________ (left to right) and __________ (up and down).
Inga [223]

Answer:

  1. rows and columns
  2. period
  3. atomic orbitals
  • valence electrons

4.similar properties

5.electrons are very reactive

  • the outermost
6 0
3 years ago
Other questions:
  • Consider the reaction below. 2Al2O3 4Al + 3O2 What is the mole ratio of oxygen to aluminum?
    15·2 answers
  • ___________ a mixture of iron filings and sulfur will make the iron and sulfur atoms combine chemically
    8·2 answers
  • A gas occupies a volume of 650.0 mL when the pressure is 3.50 atm. What will the new volume be if the pressure is reduced to 1.6
    14·1 answer
  • An element is lustrous, brittle, and silver colored. What type of element is it
    9·1 answer
  • In this molecule, what type of bond is found between the oxygen and hydrogens?
    8·1 answer
  • What is the pH of a solution of KOH with a hydroxide concentration of [OH⁻] = 1.10 x 10⁻⁴
    6·1 answer
  • Help! I don't have the things to do this and its due TODAY! Could someone help me?
    13·2 answers
  • _________ energy is to the fission and fusion within an atom as ________ energy is to the fission of atomic compounds.
    10·2 answers
  • How many particles are present in 0.67 moles of radon?
    9·1 answer
  • Hi! ❤️ , im looking for some help here. ill give brainliest if able to.
    9·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!