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3 years ago

Compared to an atom of C-12, an atom of C-14 has a greater

Chemistry

2 answers:

Advocard [28]3 years ago

4 0

Answer:

Compared to an atom of C-12, an atom of C-14 has a greater mass number.

Explanation:

Each chemical element is characterized by the number of protons in its nucleus, which is called the atomic number Z. But in the nucleus of each element it is also possible to find neutrons, the number of which can vary. The atomic mass (A) is obtained by adding the number of protons and neutrons of a given nucleus.

The same chemical element can be made up of different atoms, that is, their atomic numbers are the same, but the number of neutrons is different. These atoms are called element isotopes.

So, in this case C-12 and C-14 are two isotopes of the element carbon. Taking into account the aforementioned, then the difference between C-12 and C-14 is the number of neutrons in each of its atoms because the number of protons (atomic number) is 6 for both isotopes. So, atoms of C-12 have 6 neutrons and atoms of C-14 contain 8 neutrons.

Because neutrons have a mass comparable to that of protons, isotopes have a different atomic weight. Isotopes that have less neutrons are lighter and are called lighter isotopes, those with more neutrons weigh more and are called heavy isotopes. Then, C-12 is lighter than C-14.

Compared to an atom of C-12, an atom of C-14 has a greater mass number.

Ket [755]3 years ago

3 0

Answer:

mass number

Explanation:

because the mass number is the number of protons plus the number of neutrons, and the number of protons in an element is always the same, therfore and atom of C-14 has a greater mass number

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Where information about each element is located

Igoryamba

Answer:

On the pereiodic table.

Explanation:

3 0

3 years ago

Which of the following is soluble in water?

Keith_Richards [23]

Solubility rules state that group one metals and Nitrates are always soluble. Rubidium is a group one metal, so Rubidium Nitrate, RbNO3, is soluble.

5 0

3 years ago

Answer with explanation and you’ll get brain list

Gwar [14]

Answer:

Option D.

Explanation:

6H₂ + P₄ → 4PH₃

First we convert the given reactant masses into moles, using their respective molar masses:

4.00 g H₂ ÷ 2 g/mol = 2 mol H₂

6.20 g P₄ ÷ 124 g/mol = 0.05 mol P₄

0.05 moles of P₄ would react completely with (6*0.05) 0.3 moles of H₂. There are more H₂ moles than required, meaning H₂ is in excess and P₄ is the limiting reactant.

Now we calculate how many PH₃ moles could be formed, using the number of moles of the limiting reactant:

0.05 mol P₄ * $\frac{4molPH_3}{1molP_4}$ = 0.2 mol PH₃

Finally we convert 0.2 mol PH₃ into grams, using its molar mass:

0.2 mol PH₃ * 34 g/mol = 6.8 g

So the correct answer is option D.

5 0

3 years ago

Calculate the rate of dissolution (dM/dt) of relatively hydrophobic drug particles with a surface area of 2.5×103 cm2 and satura

Crank

Answer:

$\large \boxed{\text{1.22 mg/s}}$

Explanation:

We can use the Noyes-Whitney equation to calculate the rate of dissolution.

$\dfrac{\text{d}M}{\text{d}t} = \dfrac{DA(C_{s} - C)}{d}$

Data:

D = 1.75 × 10⁻⁷ cm²s⁻¹

A = 2.5 × 10³ cm²

Cₛ = 0.35 mg/mL

C = 2.1 × 10⁻⁴ mg/mL

d = 1.25 µm

Calculations:

Cₛ - C = (0.35 - 2.1 × 10⁻⁴) mg·cm⁻³ = 0.350 mg·cm⁻³

d = 1.25 µm = 1.25 × 10⁻⁶ m = 1.25 × 10⁻⁴ cm

$\dfrac{\text{d}M}{\text{d}t} = \dfrac{(1.75 \times 10^{-7} \text{cm}^{2}\text{s}^{-1})(2.5 \times 10^{3} \text{ cm}^{2})(0.350\text{ mg$\cdot$cm$^{-3}$})}{1.25 \times 10^{-4} \text{ cm}} = \textbf{1.22 mg/s}\\\\\text{The rate of dissolution is $\large \boxed{\textbf{1.22 mg/s}}$}$

8 0

3 years ago

What is the pH of a 0.083 solution of HCI

quester [9]

Answer:

The pH is 1.08, being an acid pH

Explanation:

pH is a parameter used to measure the degree of acidity or alkalinity of a substance. The pH scale ranges from 0 to 14. Values less than 7 indicate the acidity range and those greater than 7 indicate alkalinity or basicity. Value 7 is considered neutral. Mathematically, pH is the negative logarithm of the molar concentration of hydrogen or proton ions (H⁺) or hydronium ions (H₃O⁺).

pH= - log [H⁺]= - log [H₃O⁺]

A strong acid is an acid that completely dissociates into hydrogen ions and anions in solution. This implies that the initial concentration of acid is equal to the final concentration of H₃O⁺. This occurs with acid HCl.

So, pH is calculated as:

pH= - log (0.083)

pH= 1.08

The pH is 1.08, being an acid pH

8 0

3 years ago