It’s about the periodic table of elements

Montano1993 [528]

Answer:

A neutron is a subatomic particle with a mass comparable to a proton and a neutral electrical charge. A neutron is a subatomic particle with a mass of 1 and charge of 0. ... While the number of protons in a atom determines its element, the number of neutrons determines its isotope

Explanation:

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7 0

2 years ago

Calculate the standard enthalpy change for the reaction at 25 ∘C. Standard enthalpy of formation values can be found in this lis

weqwewe [10]

Answer:

$\Delta H_{rxn}=-2043.999kJ$

Explanation:

$\Delta H_{rxn}^{0}=\sum [n_{i}\times \Delta H_{f}^{0}(product)_{i}]-\sum [n_{j}\times \Delta H_{f}^{0}(reactant_{j})]$

Where $n_{i}$ and $n_{j}$ are number of moles of product and reactant respectively (equal to their stoichiometric coefficient).

$\Delta H_{f}^{0}$ is standard heat of formation and $\Delta H_{rxn}^{0}$ is standard enthalpy change for reaction at $25^{0}\textrm{C}$

So, $\Delta H_{rxn}=[3mol\times \Delta H_{f}^{0}(CO_{2})_{g}]+[4mol\times \Delta H_{f}^{0}(H_{2}O)_{g}]-[1mol\times \Delta H_{f}^{0}(C_{3}H_{8})_{g}]-[5mol\times \Delta H_{f}^{0}(O_{2})_{g}]$

or, $\Delta H_{rxn}=[3mol\times -393.509kJ/mol]+[4mol\times -241.818kJ/mol]-[1mol\times -103.8kJ/mol]-[5mol\times 0kJ/mol]$

or, $\Delta H_{rxn}=-2043.999kJ$

4 0

3 years ago

Select all of the statements that are examples of technology in science. chemists using a computer program to analyze data from

Karolina [17]

Answer:

Explanation:

1. geologists using a seismograph to record vibrations moving through the Earth.

2. chemists using a computer program to analyze data from their experiments.

3. physicists using a water tank to observe the way waves interact with a model rehi.

Those three clearly describe the role of technology in science because all those researchers are using those technological equipment's for their scientific research to get an outcome (Result).

6 0

3 years ago

When 24 mol of methanol and 15 mol of oxygen combine in the combustion reaction, 2 ch3oh(

umka21 [38]

The balanced equation for combustion is as follows;
2CH₃OH + 3O₂ ---> 2CO₂ + 4H₂O
The stoichiometry of CH₃OH to O₂ is 2:3
the limiting reagent is the reactant that is fully consumed during the reaction. The amount of product formed is directly proportional to the amount of limiting reactant produced. The excess reagent is the reactant that is provided in excess and is not fully used up, there will be an amount of this reagent remaining after the reaction.
If methanol is the limiting reactant,
If 2 mol of methanol reacts with 3 moles of O₂
Then 24 mol of methanol reacts with - 3/2 x 24 = 36 mol of O₂ should be present
But only 15 mol of O₂ is present, therefore O₂ is the limiting reactant and methanol is in excess.
3 mol of O₂ reacts with 2 mol of CH₃OH
then 15 mol of O₂ reacts with 2/3 x 15 = 10 mol of CH₃OH

Excess reactant is methanol, 10 mol are used up therefore 24 - 10 mol = 14 mol are remaining at the end of the reaction

8 0

3 years ago

You are stirring a pot with a metal spoon. The spoon becomes hot in your hand. what type of heat transfer is this

Alexxandr [17]

Conduction

Explanation:

Stirring a pot with a metal spoon thereby making the spoon hot in the hand is a mode of heat transfer called conduction.

Heat is form of energy that causes differences in temperature between two bodies.

There are three modes of heat transfer which are conduction, convection and radiation.
Radiation is a form of heat transfer that does not involve a material medium.
Convection is heat transfer in fluids that involves movement of the materials of the medium.
Conduction is a mode of heat transfer in solids that involves movement of the materials of the medium.

learn more:

Heat transfer from sun brainly.com/question/1140127

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4 0

3 years ago