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KengaRu [80]
2 years ago
11

What are valence electrons? The number of neutrons in a nucleus. The number of protons in the nucleus. The atomic mass is the sa

me as the number of valence electrons. The number of electron in the outer most shell of an atom.​
Chemistry
1 answer:
Tanzania [10]2 years ago
3 0

Valence Electrons are The number of electrons in the outer most shell of an atom. These shells have a maximum amount before being filled by electrons, in which remaining electrons will fill the next remaining valence shell.

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Explain how you would decide which represents a greater mass: 3.25 x 1022 atoms of Ca or 2.45 grams of Mg?
elena55 [62]

Answer:

  • <u>You need to convert the number of atoms of Ca into mass in grams, using Avogadro's number and the atomic mass of Ca.</u>

Explanation:

The amount of matter is measured in grams. Thus, you need to convert the number of atoms of Ca (calcium) into mass to compare with 2.45 grams of Mg.

To convert the atoms of calcium into mass, you divide by Avogadro's number, to obtain the number of moles of atoms, and then divide by the atomic mass of calcium.

<u />

<u>1. Number of moles, n</u>

      n=\dfrac{\text{number of atoms}}{\text{Avogadro's number}}\\ \\ \\ n=\dfrac{3.25\times 10^{22}}{6.022\times 10^{23}}=0.053969mol

<u />

<u>2. Mass</u>

  • mass = number of moles × atomic mass
  • mass = 0.053969mol × 40.078g/mol = 2.16g

Then, 2.45 g of Mg represent a greaer mass than the 3.25 × 10²² atoms of Ca.

4 0
3 years ago
A group of birds eat fruit from a tree. The fruit falls to the ground where
olchik [2.2K]

Answer:

Both answer choice 2 and answer choice 3 are correct choices.

Explanation:

Biotic factors are living components in an ecosystem. They are living organisms which affect another living component in an ecosystem.

Antibiotic factors are non living components of an ecosystem. They are chemicals which affect living organisms.

The choice 2 is correct. The seeds spread out by mice is a biotic factor interacting with an antibiotic factor

Choice 3 is correct. The seeds in the soil grow into new trees are biotic factors interacting with an antibiotic factor

3 0
3 years ago
The two rate statements below are not the same. Use the concept of unit rates to explain
olganol [36]
It’s definitely B but I’m not sure
8 0
2 years ago
Only positive ions have a charge. true or false?
Elis [28]

Answer:

true

Explanation:

5 0
3 years ago
SEP Engaging in Argument A classmate claims that sodium is a significant
blondinia [14]

Sodium is not a macromolecule hence it does not contain any calories.

<h3>Does sodium contain calories?</h3>

The term  calorie is a unit of energy. We often us the term to describe the amount of energy that is contained in each kind of food. The higher the calories, the greater the energy that the food contains.

Calories can only be contained by macromolecules such as proteins, carbohydrates, fats etc. Sodium is not a macromolecule hence it does not contain any calories at all hence the classmate is wrong.

Learn kore about calories:brainly.com/question/22374134

#SPJ1

7 0
1 year ago
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