CHEMISTRY MIDDLE SCHOOL

if a gas occupies at 5.40 L at a pressure of 1.25atm, what will be its volume at a pressure of 3.00 atm? (Show work)

Answers

Answer 1

Answer:

Answer:

Explanation:

Givens

P = 1.25 atm

V = 5.4 L

P1 = 3 atm

V1 = ??

Formula

The basic formula is P*V = P1 * V1

Solution

1.25 * 5.4 = 3 * V1

6.75 = 3*V1

6.75 /3 = 3*V1/3

2.25 = V1

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Energy is defined as theA ability to cause change in matter or the capacity to do workB amount of matter in a substancec feree times distance-D distance divided by the time
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The accepted value for the percent by mass of water in a hydrate is 36.0%. In a laboratory activity, a student determined the percent by mass of water in the hydrate to be 37.8%. What is the percent error for the student's measured value?(1) 5.0% (3) 1.8% (2) 4.8% (4) 0.05%
List five physical properties?

During an experiment a student measured the temperature of water while it boiled in a pot on a stove. The temperature of the water stayed at 100°C during the entire time that the water was boiling.

Answers

Answer:

The temperature of the water stayed at $100^(0) C$ because the temperature of a pure water does not increase at its boiling point, $100^(0) C$ . This is due to latent heat of vaporisation.

Explanation:

During a change of state of a substance, the temperature does not change due to latent heat of the substance. Latent heat is the amount of heat required to convert a unit mass of a substance from one state to another without a change in its temperature. There are two types of latent heat, latent heat of fusion anf latent heat of vaporisation.

So during the experiment, the water got to its boiling point and continues to boil at this constant temperature until it would change completely to steam at that temperature. After the conversion process, the temperature begins to increase.

The latent heat of vaporisation came into action during the process of boiling the water at constant temperature. That's why the temperature of the water did not increase even after reaching its boiling point ( $100^(0) C$ ).

Answer:

c,interpretation of the data

Explanation:

A good scientific explanation needs to be based on both data collected in an investigation and on the ability to interpret what the data means.

Normally, adding heat energy increases the temperature of a substance. However, during a phase change, the temperature of the substance stays constant. This happens because the heat energy is being used to change the phase of the matter instead of the temperature.

What is the difference between covalent bonds and ionic bonds?a. Covalent bonds involve the sharing of pairs of electrons between atoms; ionic bonds involve the sharing of single electrons between atoms.

b. Covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the electrical attraction between atoms.

c. Covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the sharing of protons between atoms.

d. Covalent bonds involve the transfer of electrons between atoms; ionic bonds involve the sharing of electrons between atoms.

Answers

Covalent bond = share of electrons between 2 non metal elements example ( co2,cl2)
They share the neucili

Ionic bond = when metal and non metal atrac each other between them there is a force of atraction

Final answer:
The difference between covalent bonds and ionic bonds is b. Covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the electrical attraction between atoms.

Final answer:

In covalent bonds, atoms share pairs of electrons to achieve a stable electron configuration. This sharing creates a strong bond between the atoms, and they are typically nonmetals. In ionic bonds, there is a transfer of electrons from one atom to another, resulting in the formation of ions with opposite charges.

One atom becomes positively charged (cation), and the other becomes negatively charged (anion). The electrical attraction between these oppositely charged ions holds them together, forming an ionic bond. Ionic bonds typically form between a metal and a nonmetal.

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Isaac read 32% of oeople owned dogs what fraction of people owned dogs

Answers

An easy way to do it is to convert the percentage to a decimal, in this case, .32

Then, multiply that by the amount of people.

An equation would be, $.32*p=$
Hope this helped :)

Multiply .32 by the number of people to receive your answer

What happens when the kinetic energy of molecules increases so much that electrons are released by the atoms, creating a swirling gas of positive ions and negative electrons?

Answers

Explanation:

Plasma is a state of matter which is a hot ionized gas and it contains molecules with positive ions and negative electrons.

Since there is high kinetic energy of molecules so, there is swirling gas of positive ions and negative electrons. As a result, there will be release of electrons.

For example, lightening is an example of partially ionized plasma.

Final answer:

When molecules gain significant kinetic energy, their collisions may cause ionization, releasing electrons and forming a plasma, the fourth state of matter. Similar processes can be observed in devices like a Van de Graaff generator or in nature, such as in the sun.

Explanation:

When the kinetic energy of molecules increases significantly, it can cause a phenomenon known as ionization. Energy fueling these molecules increases their pace, effectively leading to collisions among themselves and increasing their speed even more. As these collisions grow in strength, they can cause electrons to be released or ejected, thereby transforming neutral atoms into ions.

Visualize this using the concept of a Van de Graaff generator, which uses a source of positive charge and a moving belt to create a spray of positive charge that achieves high velocities. In conditions of intense kinetic energy, such as those induced by high temperature or light intensity, similar processes occur at the atomic level: atoms, ions, and molecules move and collide, breaking old bonds, forming new ones, and sometimes releasing electrons in the process.

The existence of a gas containing both positively charged ions and negatively charged electrons in this state is often referred to as a plasma. Plasmas are common in extremely hot environments and are considered the fourth state of matter alongside solid, liquid, and gas. Examples of plasmas include the sun and the colorful lights you see in neon signs.

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Suppose 300 mL of 0.50 M lithium bromide solution and 300 mL of 0.70 M rubidium bromide solution are combined. What is the concentration of the bromide ion in the resulting solution?

Answers

Answer:

0.60 mol·L⁻¹

Explanation:

Data:

LiBr: c = 0.50 mol/L; V =300 mL

RbBr: c = 0.70 mol/L; V =300 mL

1. Calculate the moles of Br⁻ in each solution

(a) LiBr

$\text{Moles} = \text{0.300 L} * \frac{\text{0.50 mol}}{\text{1 L}} = \text{ 0.150 mol}$

(b) RbBr

$\text{Moles} = \text{0.300 L} * \frac{\text{0.70 mol}}{\text{1 L}} = \text{ 0.210 mol}$

2. Calculate the molar concentration of Br⁻

(a) Moles of Br⁻

n = 0.150 mol + 0.210 mol = 0.360 mol

(b) Volume of solution

V = 300 mL + 300 mL = 600 mL = 0.600 L

(c) Molar concentration

$c = \frac{\text{moles}}{\text{litres}} = \frac{\text{0.360 mol}}{\text{0.600 L}} = \textbf{0.60 mol/L}$

The concentration of Br ions in the resulting solution of LiBr and RbBr has been 0.6 M.

The addition of LiBr and RbBr has been dissociated into the equal moles of Li, Rb, and Br.

$\rm LiBr\;\rightarrow\;Li^+\;+\;Br^-$

$\rm RbBr\;\rightarrow\;Rb^+\;+\;Br^-$

Thus 1 mole of LiBr = 1 mole Br

1 mole RbBr = 1 mole Br.

The moles of LiBr in 0.5 M solution:

Molarity = $\rm moles\;*\;(1000)/(volume\;(ml))$

0.5 = $\rm moles\;*\;(1000)/(300\;ml)$

Moles of LiBr = 0.15 mol

The moles of Br from LiBr = 0.15 mol.

The moles of RbBr in 0.7 M solution:

Molarity = $\rm moles\;*\;(1000)/(volume\;(ml))$

0.7 = $\rm moles\;*\;(1000)/(300\;ml)$

Moles of RbBr = 0.21 mol

The moles of Br from RbBr = 0.21 mol.

The total moles of Br ions from LiBr and RbBr has been :

= 0.15 + 0.21

= 0.36 mol.

The total volume of the solution will be:

= 300 + 300 ml

= 600 ml.

The concentration of the Br ion has been:

Molarity = $\rm moles\;*\;(1000)/(volume\;(ml))$

Molarity of Br ions = $\rm 0.36\;*\;(1000)/(600\;ml)$

Molarity of Br ions = 0.6 M.

The concentration of Br ions in the resulting solution of LiBr and RbBr has been 0.6 M.

For more information about the concentration of the sample, refer to the link:

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A 50°C solution has a pH of 3.30. At this temperature, Kw = 5.48 x 10 9. What is the pOH of the solution?

Answers

Answer:

9.93

Explanation:

Your value for Kw is incorrect. The correct value is 5.48 × 10^-14.

pH + pOH = pKw

3.30 + pOH = -log(5.84 × 10^-14) = 13.23

pOH = 13.23 - 3.30 = 9.93

The pOH of the solution is 9.93.

The pOH of the solution is 10 .

Given that, the pH of the solution is 3.30, we also know that;

pH = - log[H^+]

Hence;

[H^+] = Antilog (-3.3)

[H^+] = 5.0 × 10^-4 M

But;

Kw = [H^+] [OH^-]

[OH^-] = Kw/[H^+]

The accurate value of Kw is 5.48 × 10^-14 not 5.48 x 10 9

[OH^-] = 5.48 x 10^-14/ 5.0 × 10^-4

[OH^-] = 1.1 x 10^-10 M

pOH = - log[1.1 x 10^-10 M]

pOH = 10

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