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3 years ago

The _ of an element includes atomic number plus the number of neutrons.

Chemistry

2 answers:

Dahasolnce [82]3 years ago

7 0

It is the Mass Number!!!!!!!

kozerog [31]3 years ago

6 0

The correct answer for this will be

atomic
mass

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Which measurement density or conductance do you believe gives a more accurate method to determine the salt concentration of a so

lakkis [162]

<span>Conductance gives a more accurate method to determine the salt concentration of a solution.Conductivity would be used with conductors such as metals that include copper and silver.Conductivity is a measure of water's capability to pass electrical flow. This ability is directly related to the concentration of ions in the water. These conductive ions come from dissolved salts and inorganic materials such as alkalis, chlorides, sulfides and carbonate compounds</span>

8 0

4 years ago

Write a half-reaction for the oxidation of the manganese in MnCO3(s) to MnO2(s) in neutral groundwater where the carbonate-conta

Sergeu [11.5K]

Answer:

The half-reaction for the oxidation of the manganese in $MnCO_3(s)$ to $MnO_2(s)$ .:

$MnCO_3+2H_2O\rightarrow MnO_2(s)+HCO_3^{-}+3H^+$

Explanation:

$MnCO_3+H_2O\rightarrow MnO_2(s)+HCO_3^{-}$

Let us say the medium in which reaction is taking place is an acidic medium. And balancing in an acidic mediums done as;

Step 1: Balance all the atom beside oxygen and hydrogen atom;

$MnCO_3+H_2O\rightarrow MnO_2(s)+HCO_3^{-}$

Manganese and carbon are balanced.

Step 2: Balance oxygen atom adding water on the required side:

$MnCO_3+H_2O+H_2O\rightarrow MnO_2(s)+HCO_3^{-}$

$MnCO_3+2H_2O\rightarrow MnO_2(s)+HCO_3^{-}$

Step 3: Now balance hydrogen atom by adding hydrogen ion on the required side:

$MnCO_3+2H_2O\rightarrow MnO_2(s)+HCO_3^{-}+3H^+$

6 0

3 years ago

A student is monitoring the pressure of a gas in a rigid container. The amount of gas particles and the volume of the container

GenaCL600 [577]

a.The gas pressure will decrease.

Explanation:

If in a rigid container, the amount of gas particles and volume of the container is held constant, the pressure will decrease if the temperature is reduced.

Gases are highly random particles and they require a high amount of kinetic energy to be in their state of matter.
In a condition where volume of container is fixed, the amount of gas particles is fixed and the temperature reduced, the kinetic energy of the gas particles will directly reduce.
The kinetic energy of gases is directly related to temperature.

Learn more:

kinetic theory brainly.com/question/9924094

#learnwithBrainly

6 0

4 years ago

Read 2 more answers

Molar mass of C^6H^12O^6

jolli1 [7]

Answer:

The molar mass of C6 H12 O6 is 180.15588 g/mol.

Explanation:

6 0

3 years ago

What is the relative atomic mass of a hypothetical element that consists of the following isotopes in the indicated natural abun

Flauer [41]

Answer:

82.1

Explanation:

Isotopes of the same element are atoms of the same element (so, having same number of protons) having a different number of neutrons (and so, a different atomic mass).

In this problem, this element has 3 different isotopes, with atomic mass (in atomic mass units, a.m.u.) and relative abundance listed below:

1) 78.9 12.6%

2) 80.9 13.9%

3) 82.9 73.5%

In order to calculate the relative atomic mass unit of this element, we have to calculate the weighed average of the relative atomic mass of each isotope.

This means that we can calculate it as the sum of each atomic mass unit multiplied by the relative frequency:

$\sum A_i f_i$

where $A_i$ is the atomic mass of each isotope and $f_i$ the relative frequency. Therefore, we find:

$A=(78.9)(\frac{12.6}{100})+(80.9)(\frac{13.9}{100})+(82.9)(\frac{73.5}{100})=82.1$

4 0

3 years ago

The ____ _____ of an element includes atomic number plus the number of neutrons.

The _ of an element includes atomic number plus the number of neutrons.