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
nalin [4]
3 years ago
14

Stars, such as our sun, use fusion to combine hydrogen atoms into helium atoms, and in the process, create energy. As massive st

ars use the last of their helium fuel, they begin to collapse and temperatures climb high enough to fuse other heavier elements. As elements increase in atomic number, the amount of energy required for fusion to occur also increases. Nickel represents the heaviest element that can be produced by fusion due to to the net energy requirements. Two atoms of ___________ could combine by fusion in order to create nickel.
A) hydrogen
B) nitrogen
C) oxygen
D) silicon

Scientists use the emission spectra of elements to detect
A) explosives in luggage.
B) cracks in support structures, like bridges.
C) the possibility of an earthquake occurrence.
D) elements in clouds of gas and dust in deep space

Vanadium has two naturally occuring isotopes - vanadium-50 and vanadium-51. Predict the isotopic mass of vanadium-50 given that vanadium-50 has an abundance of 0.250% and that vanadium-51 has an abundance of 99.750% and a mass of 50.944 amu.
A) 49.944 amu
B) 62.558 amu
C) 63.303 amu
D) 5094.151 amu
Chemistry
1 answer:
Zinaida [17]3 years ago
4 0

Hey there! The answer to your first question is SILICON, Nickle has 28 protons, silicon has 14, 14+14=28. Its the only element thats adds up. I dont know about the 2nd one myself.

You might be interested in
how do the properties of sodium chloride compare with the properties of its component elements, sodium
Orlov [11]

Sodium chloride is a nonreactive solid at room temperature, and is commonly known as table salt. The two elements that make up sodium chloride are sodium and chlorine. Sodium is a very reactive metal that tastes bad. Pure sodium is explosive when it comes in contact with water. Hope this helps

3 0
3 years ago
C) Mercury is solid at room temperature....True Or False<br>​
Zielflug [23.3K]

Answer:

true

Explanation:

Because Mercury can be solidified when its temparature us brought to its freezing point. However, when returned to room temparature conditions, mercury does not exist in solid state for long, and returns back to its more common liquid form.

7 0
3 years ago
What are the chemical formulas for..
andrezito [222]
S4O5
S3O
SeF6
N4S5
CCl9

All numbers should be subscripts
6 0
3 years ago
Orbitals which valence electrons are found for calcium
galina1969 [7]
The 4th energy level (row), 's' orbital block, 2nd group (column). The valence electrons are found in the highest energy level of the electron configuration in the 's' and 'p' orbitals. In the case of calcium this is 4s2 . This gives calcium an 's' orbital with a pair of electrons in its valence shell
8 0
3 years ago
The force of attraction between a divalent cation and a divalent anion is 1.64 x 10-8 N. If the ionic radius of the cation is 0.
Elden [556K]

The radius of the anion is 7.413 nm

<h3>How to calculate the force of attraction between charges</h3>

The force of attraction (F) is given by the formula:

  • F = (1/4π∈r²)(Zc*e)(Za*e)

where:

∈ = permittivity of free space = 8.85*10⁻¹⁵ F/m

Zc = charge on the cation = +2

Zc = charge on the anion = -2

e = charge on an electron = 1.602 * 10⁻¹⁹ C

r = interionic distance

r = rc + ra

where rc and ra are the radius of the cation and anion respectively

F = 1.64 * 10⁻⁸ N

Therefore based on the equation of force of attraction:

1.64 *10⁻⁸ = [1/4π(8.85*10⁻¹⁵)r²](2 * 1.602*10⁻¹⁹)²

r² = 5.63 * 10⁻¹⁷

r = 7.50 nm

Since r = rc + ra

where rc = 0.087 nm

thus, ra = r - rc = 7.50 - 0.087

ra = 7.413 nm

Therefore, the radius of the anion is 7.413 nm

Learn more about ionic radius at: brainly.com/question/2279609

6 0
2 years ago
Other questions:
  • How many grams of naoh are present in 350.0 ml of a 5.69 m naoh(aq) solution?
    5·1 answer
  • “It is important we work together on this project; we want our group to succeed.” This statement reflects __________.
    14·1 answer
  • What part of an atom has no relative mass
    5·2 answers
  • Calculate the speed of sound wave with a frequency of 20hz and a wave length of 3.00m
    10·1 answer
  • How can so many different substances in the world be made of so few elements?
    10·1 answer
  • Please help!!
    8·1 answer
  • What is the atomic number of the Adam shown 18 protons 22 neutrons
    7·1 answer
  • An object that has 0 acceleration will NEVER be in motio<br> TRUE<br> FALSE<br> Check it
    10·2 answers
  • Are you chemistry because you just blew up my heart
    6·2 answers
  • Choose the three chemical properties of a penny
    12·1 answer
Add answer
Login
Not registered? Fast signup
Signup
Login Signup
Ask question!