One isotope of nitrogen has 7 protons and 8 neutrons. Which is the correct reference for this isotope? A.
nitrogen-15

B.
nitrogen-8

C.
nitrogen-7

D.
nitrogen-1

Answers

Answer 1

Answer:

D nitrogen-1 because you divide the two numbers to get what left of the nitrogen

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Find the ΔH for the reaction below, given the following reactions and subsequent ΔH values: PCl5(g) → PCl3(g) + Cl2(g) P4(s) + 6Cl2(g) → 4PCl3(g) ΔH = -2439 kJ
4PCl5(g) → P4(s) + 10Cl 2(g) ΔH = 3438 kJ

Answers

The value of ΔH will be 249.75 KJ.

To obtain the reaction :

PCl5(g) → PCl3(g) + Cl2(g)

We have to add the given reactions and then divide it by 4.

(i) adding the reactions

P4(s) + 6Cl2(g) → 4PCl3(g) ΔH = -2439 kJ

4PCl5(g) → P4(s) + 10Cl 2(g) ΔH = 3438 kJ

we get:

4PCl5(g) → 4PCl3(g) + 4Cl2(g), ΔH = 3438 - 2439

(ii) dviding by 4

PCl5(g) → PCl3(g) + Cl2(g) , ΔH = (3438 - 2439)/4

ΔH = 249.75 kJ is the required enthapy.

Learn more about enthalpy:

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Answer:

The value of $\Delta H$ for the desired reaction will be 249.75 KJ.

Explanation:

The desired reaction is shown below

$\textrm{PCl}_(5)\left ( g \right )\rightarrow \textrm{PCl}_(3)\left ( g \right )+\textrm{Cl}_(2)\left ( g \right )$

The desired reaction can be obtained by adding the given reactions and then dividing both sides by 4.

$P_(4)\left ( s \right )+6Cl_(2)\left ( g \right )\rightarrow 4PCl_(3)\left ( g \right ) \n4PCl_(5)\left ( g \right )\rightarrow P_(4)\left ( s \right )+10Cl_(2)\left ( g \right )$

Net Enthalpy change for the desired reaction

$\displaystyle (3438-2439)/(4) \textrm{ KJ} = 249.75 \textrm{ KJ}$

$\Delta H = 249.75 \textrm{ KJ}$

Which methods will help you properly identify pH with indicator paper? Check all that apply. Set a piece of pH paper in front of each solution before testing to keep organized. Dip the pH paper into each test tube and lay it on the table to let it change color. Use a transfer pipet to remove a few drops from the solution to drop onto the paper. Wait a minute or so before reading color. Use the same piece of indicator paper for each solution to conserve paper.

Answers

To identify pH with indicator paper,Set a piece of pH paper in front of each solution before testing to keep organized then, Use a transfer pipet to remove a few drops from the solution to drop onto the paper, Lastly Wait a minute or so before reading color.

What is a pH?

The pH is a measure of how acidic/basic a solution bythe amount of free hydrogen and hydroxyl ions in the water.

The range goes from 0 - 14, A point on 7 is neutral. pHs of less than 7 indicate acidity, whereas a pH of greater than 7 indicates alkalinity.

A pH paper usually called litmus paper is used to determine if the acidity, basicity or neutrality of a solution. This is determined by the following process:

Set a piece of pH paper in front of each solution before testing to keep organized.
Use a transfer pipet to remove a few drops from the solution to drop onto the paper.
Wait a minute or so before reading color.

Now if the paper turns red, the pH may likely be below 7 to show acidity

if the paper turns blue the pH may likely be above 7 to show basicity/alkalinity.

if the paper turns green , the pH is 7 to show neutrality.

See here for similar answer on pH with indicator paperbrainly.com/question/15639358

Answer:

A) Set a piece of pH paper in front of each solution before testing to keep organized.

C) Use a transfer pipet to remove a few drops from the solution to drop onto the paper.

D) Wait a minute or so before reading color.

Describe two ways that thermal energy transfer in earth changes the land

Answers

There are three methods of thermal energy transfer: conduction, convection, and radiation. Air molecules that come into contact with the warmer land and surface of the oceans and lakes increase their thermal energy through conduction.

What is the chemical equation for the burning of propane if all the products and reactants are in the gas phase?4H2O(g) + 3CO2(g) + 5O2(g) → C3H8(g)

C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g)

C3H8(g) + O10(g) → 3CO2(g) + 4H2O(l)

4H2O(l) + 3CO2(g) → C3H8(g) + 5O2(g)

Answer - B -
C3H8(g) + 5O2(g) → 3CO2(g) + 4H2O(g)

Answers

Propane is a hydrocarbon and it will burn in presence of oxygen (it will undergo combustion) to give carbon dioxide and water (all in gas phase).

In presence of oxygen the carbon gets oxidized to carbon dioxide and hydrogen to water.

The general equation for a hydrocarbon undergoing combustion is

$CxHy(g) + (x+(y)/(4))O_(2) ---> xCO_(2)(g) +(y)/(2)H_(2)O(g)$

Here we are studying the combustion of propane so

x = 3

y = 8

Propane has molecular formula of C3H8

Therefore the balanced equation will be

$C3H8(g) + (3+(8)/(4))O_(2) ---> 3CO_(2)(g) +(8)/(2)H_(2)O(g)$

$C3H8(g) + 5O_(2) (g) ---> 3CO_(2)(g) + 4H_(2)O(g)$

Answer:

Explanation:

its right

You place ice cubes into a glass of lemonade what happens to make the lemonade to get cold

Answers

When we place ice cubes into a glass of lemonade then transfer of thermal energy from lemon water to ice cubes takes place.

What is transfer of energy?

Transfer of energy means the transformation of energy from one form to another form or from one place to another place.

When we place ice cubes into a glass of lemonade, as we know that the temperature of ice cubes is low and it has low thermal energy and the temperature of lemonade is high and have a high thermal energy as compared to ice cubes. In this condition thermal energy goes from lemonade to the ice cube till they both have same thermal energy.

Hence, transfer of thermal energy takes place.

To know about transfer of energy, visit the below link:
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The heat energy from the room temperature lemonade transfers to the cold ice cubes, causing the temperature of the lemonade to drop and the temperature of the ice cube to rise until they are equal to each other.

What were the names of the minerals and types of rocks?