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
Lady bird [3.3K]
3 years ago
9

With reference to He-4 (or the diagram), explain the term isotopes.

Chemistry
1 answer:
boyakko [2]3 years ago
6 0

Answer:

Isotopes are basically atoms of an element that have an unequal number of neutrons and protons. Of course the proton number remains the same, but the neutron number either decreases or increases, which leads to an overall change in mass. However, no chemical properties of the atom/element are changed as the electrons are the same number and do not react. In regards to Helium 4, the original number of neutrons in Helium is 2, and protons 2 as well. We see an equal number of neutrons and protons, hence an unchanged mass, and the element is <em>not</em> an isotope.

You might be interested in
An electrolysis reaction is
Llana [10]

Answer:

the electrolysis reaction is a non- spontaneous reaction

Explanation:

Since electrons flow from it, the anode in an electrolytic cell is positive, while the cathode is negative when electrons flow into it. The device functions like a galvanic cell in that direction. In an electrolytic cell, an external voltage is applied and that is what causes a non spontaneous reaction

3 0
3 years ago
The density of a saline (salt) solution is 1.27 g/mL. What is the mass of 326 milliliters of the solution?
zlopas [31]

Answer:

thx for the points

Explanation:

7 0
3 years ago
Read 2 more answers
when copper is bombarded with high energy electron x rays are emitted.Calculate the energy(in joule) associated with photons if
kakasveta [241]
The answer that i got was three
 i redid it and got some answer like 4.62 x1014<span> Hz</span>
3 0
3 years ago
After performing a dilution calculation, you determine you need 25.0 milliliters of an aqueous stock solution to make 100.0 mill
IRINA_888 [86]
A is obviously out because it leads to a volume of 125.0 milliliters of the new solution and gives you a lower concentration than you were aiming for.

D is out because you are adding 75 milliliters of the stock solution, so your concentration would be too high. You only need 25.0 milometers of stock solution per 100 milliliters of the new solution.

C is also out because it leads to 50.0 milliliters stock solution per 100 milliliters of the new solution and hence the wrong concentration.

B is by default the correct answer. It also details the correct technique. First you add the stock solution (This you know from your calculations to be 25 milliliters.) then you add the water up to the volume you needed. (Because the calculations only tell you the total volume of water not what you need to add) You also add the water last so you can rinse the neck of the flask to make sure you also get all the stock solution residue into the stock solution.

I would add the final step of stirring, but B is the only answer that can be correct.
8 0
3 years ago
Read 2 more answers
A molecule has three bonded atoms around the central atom. The central atom does not have any lone pairs. What is the geometry o
adelina 88 [10]

Answer:

trigonal planar

Explanation:

Tri=three, three-dimensional arrangement of the atoms that constitute a molecule.

5 0
3 years ago
Other questions:
  • What type of intermolecular forces exist between br2 and ccl4?
    11·1 answer
  • Identify each of the following mixtures as either homogeneous or heterogeneous and as a solution, a
    6·2 answers
  • What is the balance equation of Aluminum metal and iron (III) oxide react to form aluminum oxide and iron metal?
    9·1 answer
  • How did organic compounds get their name? Explain how the word is related to its meaning.
    10·1 answer
  • Which one of these complementary base pairs can form three hydrogen bonds?
    14·1 answer
  • The function of hydrochloric acid in the gastric juice.
    6·1 answer
  • PLS HELPP FIRST TO BE CORRECT WILL GIVE BRANLIEST!!
    10·1 answer
  • Read the selection from the section "Molecules In Motion." The molecules in the hot soup are traveling faster overall than they
    10·1 answer
  • Which element has seven energy levels?
    9·1 answer
  • AgNO3 is a useful chemical that has many applications and can undergo a variety of reactions. In the following examples, balance
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!