CHEMISTRY HIGH SCHOOL

How many atoms are in 11.9 moles of chromium?

Answers

Answer 1

Answer:

Answer:

$7,16.10^(24)$

Explanation:

We know that in 1 mole of any substances there are $6,02. 10^(23)$ atoms

This number ( $6,02. 10^(23)$ ) is a constant that is known as the avogadros number

if we know how many atoms are in a mole of chromium to calculate how many there are in 11.9 moles we apply a simple rule of three

$1 mol Cr\longrightarrow 6,02.10^(23) atoms\n 11.9 moles Cr\longrightarrow x\nx=((11.9)(6,02.10^(23)))/(1)\n x= 7,16.10^(24) atoms$

In 11.9 moles of chrome there are $7,16.10^(24)$ atoms

Answer 2

Answer: Use the following equation:
Given # of moles * molar mass (g) per mol = Mass (g)
This gives us 11.9 x 51.9962 (g) per mol.

618.75 moles

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Quantum theory states that _____. A. electrons orbit the nucleus of an atom B. electrons cannot be created or destroyed C. electrons have both wave-like and particle-like properties D. the exact position of an electron within an atom can be calculated

Answers

Answer:

Its C. electrons have both wave-like and particle-like properties

Explanation:

Which two elements have the most similar chemical properties?(1) Be and Mg (3) Cl and Ar
(2) Ca and Br (4) Na and P

Answers

Elements in the same groups shows similar chemical and physical properties. The elements having similar chemical properties are Be and Mg.

What are groups?

A group in periodic table is a column with elements of similar physical and chemical properties.

Both beryllium (Be) and magnesium are in group two with two valence electrons and both are metals. They have similar chemical and physical properties.

Cl is in 17th group and Ar is a 18th group element. They do not show any similarity in chemical properties. One is halogen which is unstable and the second one is noble gas which is stable. Thus no similarity.

Ca is a 2nd group element and Br is 17th group and they are different in chemical properties. One is metal and the second one is halogen with higher electronegativity.

Similarly, Na is in first group and P is 15th group element in periodic table in periodic table and does not show chemical similarities.

Therefore, the elements showing similar chemical properties are Be, Mg thus, option 1 is correct.

To learn more about groups in periodic table, refer the link below:

brainly.com/question/13219625

#SPJ5

atoms are made of 3 types of sub atomic particles- protons, neutrons and electrons

from these 3 particles, electrons are responsible for participating in chemical bonds. therefore chemical properties of elements are based on the number of electrons present.

valence electrons are the number of electrons in the outermost energy shell that are involved in chemical bonds.

atoms with same number of valence electrons are grouped in to columns called groups.

therefore elements of the same group have same number of valence electrons, hence similar chemical properties.

from the options given

only Be and Mg belong to the same group they both belong to group 2 with 2 valence electrons

therefore Be and Mg have similar chemical properties

answer is

1) Be and Mg

What is an exothermic chemical reaction?a. It is a reaction that converts matter to heat.
b. It is a reaction that requires heat to proceed.
c. It is a reaction that draws heat from its surroundings.
d. It is a reaction that releases heat to its surroundings.

Answers

Exo, meaning "out-", thermic meaning heat or temperature
Outgoing heat or a release of energy in the form of heat or light
Reactant -> Product + Energy

Therefore, the answer is D, it is a reaction that releases heat to its surroundings

When determining an element identity what is the most important Subatomic part to look at?

Answers

Answer: Protons

Explanation: When determining an element identity the most important Subatomic part to look at is the number of protons in the nucleus determines the identity of an atom .

If i add 25 mL of water to 125 mL of a 0.15 M NaOH solution, what will the molarity of the diluted solution be ?

Answers

Taking into account the definition of dilution, the molarity of the diluted solution is 0.125 M.

Dilution

When it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution.

Dilution is the process of reducing the concentration of solute in solution, which is accomplished by simply adding more solvent to the solution at the same amount of solute.

In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume (and weight) of the solution increases.

A dilution is mathematically expressed as:

Ci×Vi = Cf×Vf

where