11) A sample of gas has a volume of 823.7 mL and a pressure of 351.8 torr. What volume (in mL) will the gas occupy at 752.9 torr if the temperature of the gas doesn't change? Keep the answer with one decimal place

\(\qquad \qquad\huge \underline{\boxed{\sf Answer}}\)

1. As you increase speed is there an increase or decrease in Kinetic Energy?

\(\qquad \sf  \dashrightarrow \: increase\)

2. As you increase mass is there an increase or decrease in Kinetic Energy?

\(\qquad \sf  \dashrightarrow \: increase\)

3. As you decrease speed is there an increase or decrease in Kinetic Energy?

\(\qquad \sf  \dashrightarrow \: decrease\)

4. As you decrease mass is there an increase or decrease in Kinetic Energy?

\(\qquad \sf  \dashrightarrow \: decrease\)

A precipitate of lead(II)chloride forms when 120.0 mg of NaCl is dissolved in 0.250 L of 0.12 M lead(II)nitrate. This is true

Explanation :

True, a precipitate of lead(II)chloride forms when 120.0 mg of NaCl is dissolved in 0.250 L of 0.12 M lead(II)nitrate. To confirm this, we can use the Ksp value of PbCl2 and compare it with the reaction's Q value.

1. Calculate the moles of NaCl:
120.0 mg NaCl * (1 g / 1000 mg) * (1 mol NaCl / 58.44 g NaCl) ≈ 0.00205 mol NaCl

2. Calculate the concentration of Cl- ions:
[Cl-] = 0.00205 mol NaCl / 0.250 L ≈ 0.0082 M

3. Calculate the concentration of Pb2+ ions:
[Pb2+] = 0.12 M (since it is already given)

4. Calculate the reaction quotient, Q:
Q = [Pb2+] [Cl-]^2 = (0.12 M) * (0.0082 M)^2 ≈ 8.07 × 10^-6

5. Compare Q and Ksp:
Since Q (8.07 × 10^-6) is greater than Ksp (1.7 × 10^-5), a precipitate of lead(II)chloride will form.

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Answer:

1) (8.18 x 10 )(1.15 x 10-5)

Explanation:

470.35

Answer:

The heat capacity is the amount of heat, expressed usually in Joules or calories, needed to change the system by 1 degree Celsius. The specific heat capacity is the amount of heat required to raise 1 gram of a substance by 1 degree Celsius.

Explanation:

For example, the specific heat of H2O(l) is 4.18 J/g ° C.

Based on the information given, the mole should be considered a base unit in the SI system because it serves as a universally accepted measure of the amount or quantity of substances.

The mole of a substance is the amount of a substance that contains as many elementary particles as there are in 12 g of carbon-12.

12 g of carbon-12 contains the Avogadro number of particles which equals 6.02 * 10²³ particles.

Hence, a mole of a substance is the amount of that substance that contains  6.02 * 10²³ elementary particles of that substance.

SI units refer to units of measurement that are universally accepted for measuring the properties of quantities of objects.

Some SI unit values include:

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The molecular formula of the compound CH2 with molar mass = 42.0 g/mol is C₃H₆. Therefore, option D is correct.

The term molar mass is defined as the mass in grams of one mole of a substance. The units of molar mass are grams per mole, abbreviated as g/mol.

First, let's find the molar mass of CH₂.

The molar mass CH₂= 12.0 + (2 x 1.01)

= 14.02 g/mol

Now to determine the molecular formula, we need to find the ratio based in the molar masses.

42 / 14.02

= 2.99

≅ 3

Therefore, the ratio is 3, the molecular formula is C₃H₆.

Thus, option D is correct.

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Answer:t volume and amount of air

Explanation:According to Boyle's law, what is the relationship between pressure and volume? They are inversely related. As one increases, the other decreases

A 100.0 mL sample of natural water was titrated with 13.57 mL of 0.1123 M Na OH solution to reach a light pink  are the phenolphthalein end point. The number of millimoles of Na OH required for the titration is 1.525011 millimoles. Titration is a technique used in chemistry

to identify the quantity of a substance by adding a reactant until the chemical reaction is completed. In titration, a solution of known concentration (the titrant) reacts with a solution of unknown concentration (the analyte) to determine its concentration. Titration of natural water with Na OH In this case, we are titrating natural water with Na OH to find the concentration of the unknown solution. The balanced chemical reaction for the titration of natural water with Na OH is:H2O + Na OH → Na+ + OH- + H2O

The volume of NaOH required to reach the end-point of the titration is 13.57 mL. The molarity of Na OH used for the titration is 0.1123 M. We can use the following formula to calculate the number of millimoles of Na OH required for the titration Millimoles of Na OH = (Volume of Na OH × Molarity of NaOH) / 1000Substitute the given values in the above equation and solve for the millimoles of Na OH required for the titration. Millimoles of Na OH = (13.57 mL × 0.1123 M) / 1000= 0.001525011 millimoles Therefore, the number of millimoles of NaOH required for the titration is 1.525011 millimoles.

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Answer:

Z=22.70

Explanation:

It is given that,

An element Z that has two naturally occurring isotopes with the following percent abundances as follows :

The isotope with a mass number 22 is 65.0% abundant; the isotope with a mass number 24 is 35.0% abundant.

The average atomic mass for element Z is given by :

\(Z=\dfrac{22\times 65+24\times 35}{100}\\\\Z=22.7\)

So, the average atomic mass for element Z is 22.70.

Explanation:

Using the formula q = m × c × ☆t

heat = mass × specific heat capacity × change of temperature

heat = 0.55kg × 0.21 × 10° = 1.155

If we additionally assume that the volumes are adjective, then 12.5 divided by 50 + 1 red 20 point gives us 12.5 divided by 170, which is 0.0735 and is in molars. So, this is concentration of the hydroxide ions in the solution.

What is the concentration of the hydroxide ions ?

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Answer:Li2O

Explanation:  Lithium is an alkali metal in Group 1.  It has a single valence electron that it would be pleased to give up, or share, with another element.  Oxygen is in Group 16, just one removed from the halogens.  It has 6 valence electrons, and wants 2 mosr to complete it's valence shell.  One lithium will contribute 1 electron, so oxh=ygen will keep looking for a second.  If another lithium is available, it will react with that one also, resulting in Li2O.

Answer:

The answer will be 2.98K

Explanation:

Using the formula:

Q = mc∆T

Q= 5,800 (heat in joules)

m= convert 15.2kg to g which is 15200g (mass in grams)

c= 0.128 J/g °c (Specific heat capacity)

∆T=  what we need to find (temperature change)

5800J = 15200g x 0.128 x ∆T

= 2.98K  

Answer:

As a substance changes from a solid to a liquid to a gas, its molecules first the molecules are moving fast enough, they are able to "escape." They leave the surface of the liquid as gas molecules. Evaporation is not the only process that can change a substance from a liquid to a gas. The same change can occur through boiling.

Explanation:

hopfully this helps!

Answer:

Explanation:

The density of a substance can be found by using the formula

\(d = \frac{m}{v} \\ \)

where

m is the mass

v is the volume of object

From the question we have

m = 450 g

v = 500 ml

\(d = \frac{450}{500} = \frac{9}{10} \\ = 0.9\)

We have the final answer as

Hope this helps you

Answer:

B) g/mL

Explanation:

Mass of Oxalic acid (solute) = 11g

Mass of Solution = 500ml

Density = 1.1 g/ml

We know that

Mass % of solute =

Massofsolution

Massofsolute×100

×

50

Mass of solution =

Volume of solution×

Density of solution

Mass of solution =

500×

1.1=

50×

11g

Mass % of the solute =

11×50

11×100

=

2%

2.50 g of helium gas at STP would occupy a volume of 14.0 liters.

Standard temperature and pressure (STP) conditions of 0°C and 1 atm, we can use the molar volume of a gas at STP, which is 22.4 L/mol.

1. Helium seems to have a molar mass of 4.00 g/mol.

Therefore, we can calculate the number of moles of helium as:

moles of He = mass of He divided by molar mass of He

= 2.50 g / 4.00 g/mol

= 0.625 mol

Then, we can use the molar volume of a gas at STP to calculate the volume of helium gas:

volume of He = moles of He x molar volume of gas at STP

= 0.625 mol x 22.4 L/mol

= 14.0 L

2.50 g of helium gas at STP would occupy a volume of 14.0 liters.

2. The molar mass of sodium is 22.99 g/mol. Therefore, we can calculate the number of moles of sodium as:

moles of Na = number of atoms of Na divided by Avogadro's number

= 5.0 x 10²⁵ atoms / 6.022 x 10²³ atoms/mol

= 83.0 mol

Then, we can use the molar mass of sodium to calculate the mass of sodium:

mass of Na = moles of Na x molar mass of Na

= 83.0 mol x 22.99 g/mol

= 1900 g

Therefore, 5.0 x 10²⁵ atoms of sodium have a mass of 1900 g.

3. The molar mass of Ni is 58.69 g/mol. Therefore, we can calculate the number of moles of Ni as:

moles of Ni = mass of Ni divided by molar mass of Ni

= 3.95 g / 58.69 g/mol

= 0.0673 mol

Then, we can use Avogadro's number to calculate the number of atoms of Ni:

number of atoms of Ni = moles of Ni x Avogadro's number

= 0.0673 mol x 6.022 x 10²³ atoms/mol

= 4.05 x 10²² atoms

Therefore, 3.95 g of Ni contain 4.05 x 10²² atoms.

4. The molar mass of Xe is 131.29 g/mol. Therefore, we can calculate the number of moles of Xe as:

moles of Xe = mass of Xe divided by molar mass of Xe

= 15 kg / 131.29 g/mol

= 114 mol

Then, we can use Avogadro's number to calculate the number of atoms of Xe:

number of atoms of Xe = moles of Xe x Avogadro's number

= 114 mol x 6.022 x 10^23 atoms/mol

= 6.87 x10²⁵ atoms

Therefore, a 15 kg sample of Xe gas contains 6.87 x 10²⁵ atoms.

5. A gas's molar volume at STP is 22.4 L/mol. Therefore, we can calculate the number of moles of Ar as:

moles of Ar = number of atoms of Ar divided by Avogadro's number

= 45,000,000 atoms / 6.022 x 10²³ atoms/mol

= 7.47 x 10⁻¹⁷ mol

Then, we can use the molar volume of a gas at STP to calculate the volume of Ar gas:

volume of Ar = moles of Ar x molar volume of gas at STP

= 7.47 x 10⁻¹⁷ mol x 22.4 L/mol

= 1.67 x  10⁻¹⁵ L

Therefore, 45,000,000 atoms of Ar would occupy a volume of 1.67 x 10⁻¹⁵ liters at STP.

6. The molar mass of CO₂ is 44.01 g/mol. Therefore, we can calculate the number of moles of CO₂ as:

moles of CO₂ = mass of CO₂ divided by molar mass of CO₂

= 75 g / 44.01 g/mol

= 1.70 mol

Then, we can use Avogadro's number to calculate the number of atoms of CO₂:

number of atoms of CO₂ = moles of CO₂ x Avogadro's number

= 1.70 mol x 6.022 x 10²³ atoms/mol

= 1.02 x 10²⁴ atoms

Therefore, a 75 g sample of CO₂ contains 1.02 x 10²⁴ atoms.

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Answer:

A. 7

(assuming the water is neutral)

a)Igneous rocks, b)Sedimentary rocks c)heat and pressure d)cooling e)weathering/erosion f)heat and pressure, g)compaction/cementation

Under great heat and pressure, the magma that is formed from the volcanoes or earth surfaces forms the a)igneous rocks. The d)cooling of magma produces igneous rocks. These igneous rocks under great heat and pressure form metamorphic rocks.

Through the process of e) weathering and erosion, both igneous and metamorphic rocks turn to form sediments which on g)compaction and cementation form b) sedimentary rocks.

In this cycle rocks of different types are formed through various geological processes. Depending upon the external conditions the size and structure of rocks are determined. However, under great c)pressure and heat metamorphic rocks turn to form magma and form igneous rocks. Likewise, sedimentary rocks under f) heat and pressure form metamorphic rocks.

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Positively charged ions are known as cations.Negatively charged ions are referred to as anions.A charged atom or molecule is an ion.

Ions are any atoms or clusters of atoms with just an electric charge.Positively charged ions are referred to as cations.Ions with a negative charge are known as anion.

A molecule or atom that's also negatively charged is known as an anion.A positively charged atom or molecule is referred to as a cation.Ions include both anions and cations.

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The predication that is testable here is that of Raymond. Option D

We have to keep it at the back of our minds that science deals with data that is testable. In other words, science is an empirical discipline. What we mean by this is that we must be able to get at knowledge by testing the data that we have in controlled experiments.

Now, if we look at the responses of the students, we can see that the only one that has to do with something that we can test is the one that said that Ocean surface temperatures are warmer than water at deep-sea vents.

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Answer: It should fill a 2.6 liter balloon

Explanation:

Multiply the standard 0.0001785g/cm³ times 1.44. then divide by 1000 since there are 1000cm³ per Litre

Round to nearest tenth.

Answer:

Explanation:

The ocean is a huge body of salt water that covers about 71 percent of Earth’s surface. The planet has one global ocean, though oceanographers and the countries of the world have traditionally divided it into four distinct regions: the Pacific, Atlantic, Indian, and Arctic oceans. Beginning in the 20th century, some oceanographers labeled the seas around Antarctica the Southern Ocean, and in 2021 National Geographic officially recognized this fifth ocean.

An estimated 97 percent of the world’s water is found in the ocean. Because of this, the ocean has a considerable impact on weather, temperature, and the food supply of humans and other organisms. Despite its size and impact on the lives of every organism on Earth, the ocean remains a mystery. More than 80 percent of the ocean has never been mapped, explored, or even seen by humans. A far greater percentage of the surfaces of the moon and the planet Mars has been mapped and studied than of our own ocean floor.

Although there is much more to learn, oceanographers have already made some amazing discoveries. For example, we know that the ocean contains towering mountain ranges and deep canyons, known as trenches, just like those on land. The peak of the world’s tallest mountain—Mount Everest in the Himalayas, measuring 8.84 kilometers (5.49 miles) high—would not even break the surface of the water if it was placed in the Pacific Ocean’s Mariana Trench or Philippine Trench, two of the deepest parts of the ocean.

Since the starting mass of the rock was 50 grams of the radioactive isotope, and we now have 12.5 grams of the radioactive isotope, we can see that the rock has undergone 2 half-lives.

The amount of time needed for the reactant concentration to drop to half its original value is known as the half-life of a reaction. A first-order reaction's half-life is independent of the reactant's concentration.

The total mass of the rock would be 100 grammes if it initially included 50 grammes of a radioactive isotope and 50 grammes of a non-radioactive element. Let's suppose that the radioactive isotope's half-life is known.

At one half-life, only 25 grammes of the radioactive isotope and 75 grammes of the non-radioactive element would remain after half of the radioactive isotope has decayed.

Following two half-lives, 12.5 grammes of the radioactive isotope and 87.5 grammes of the non-radioactive substance would remain after half of the remaining 25 grammes of the radioactive isotope had decayed.

Since the starting mass of the rock was 50 grams of the radioactive isotope, and we now have 12.5 grams of the radioactive isotope, we can see that the rock has undergone 2 half-lives.

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Answer:

Option B and A

Explanation:

However, keep in mind that 20 mSv per year is the recommended amount for any radiation worker and is still regarded quite safe. This is the most radiation most of us will ever be exposed to.

after 1st half life , remaining sample would be 100/2=50 g

after 2nd half life , remaining sample would be 50/2=25 g

after 3rd half life , remaining sample would be 25/2= 12.5 g

The half-life of a radionuclide is the amount of time it takes for half of its radioactive atoms to decay. A decent rule of thumb is that you will have less than 1% of the initial quantity of radiation after seven half-lives. Click here to learn more about half life.

A short-term and whole-body dosage would result in rapid sickness, such as nausea and a reduction in white blood cell count, followed by death.

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42.08 years of  time must pass before there is an acceptable radiation level at the site.​

What is the half-life of a radioactive material?

The half life of a radioactive substance is the period of time during which its mass or number of atoms is decreased to half of what it was initially. The time it takes for a radioactive substance (or half of its atoms) to break down or transform into another substance is commonly used to define half-life.

Radioactivity, as its name suggests, is the act of generating radiation without any external cause. This is accomplished by an atomic nucleus that is unstable for whatever reason and "wants" to surrender some energy in order to change its configuration to one that is more stable.

After first half-life will remain 2560/2 i.e. 1280g of radioactive substance.

After second half-life will remain 1280/2 i.e. 640g

After 3rd half-life will remain 640/2 i.e. 320g

After 4th half-life will remain 160g

After 5th half-life will remain 80g

After 6th, 7th and 8th half-life will remain 40g, 20g and 10g respectively

It takes 8 half-lives to reach acceptable level of radiation i.e. 8*5.26 years

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GIVEN :

• Volume ,(V1)= 100ml

• Concentration ,(C1) = 2.50 M

• Concentration ,(C2) = 0.75 M

• Volume ,(V2) = ?

The relationship between Volume and Concentration can be represented by formula :

Replacing the given parameters into the formula above , Final Volume (V2) will be :

Answer:Sublimation is the conversion between the solid and the gaseous phases of matter, with no intermediate liquid stage. For those of us interested in the water cycle, sublimation is most often used to describe the process of snow and ice changing into water vapor in the air without first melting into water.

Explanation:

Answer: 4.4

Explanation:

Thats what my computer says after i submit answer

Answer:

temperatures.

Explanation:

Movement of heat flowing from one object to the other is a result from difference in temperature. Heat will flow from your warmer object to the cooler object until they both reach the same temperature.