What volume of Br2 gas (at STP) is created when 100.0 g of chromium (III) bromide decomposes according to the reaction?
2CrBr3-> 2CrBr2 + Br2

Answer: The initial temperature of the iron was \(515^0C\)

Explanation:

\(heat_{absorbed}=heat_{released}\)

As we know that,  

\(Q=m\times c\times \Delta T=m\times c\times (T_{final}-T_{initial})\)

\(m_1\times c_1\times (T_{final}-T_1)=-[m_2\times c_2\times (T_{final}-T_2)]\)         .................(1)

where,

q = heat absorbed or released

\(m_1\) = mass of iron = 360 g

\(m_2\) = mass of water = 750 g

\(T_{final}\) = final temperature = \(46.7^0C\)

\(T_1\) = temperature of iron = ?

\(T_2\) = temperature of water = \(22.5^oC\)

\(c_1\) = specific heat of iron = \(0.450J/g^0C\)

\(c_2\) = specific heat of water= \(4.184J/g^0C\)

Now put all the given values in equation (1), we get

\(-360\times 0.450\times (46.7-x)=[750\times 4.184\times (46.7-22.5)]\)

\(T_i=515^0C\)

Therefore, the initial temperature of the iron was \(515^0C\)

The total of calories is 304 and the total of sodium is 32 milligrams.

The serving size represents a portion of food that is nutritionally appropriate. Due to this, most food containers include more than one serving size, this means they are not intended to be consumed by one person in one sitting.

Understanding serving size is important because based on this you can determine the number of calories, the amount of sodium, sugar, vitamins, etc. all the container of food has.

In the case of the apple juice, the total of fluid is 16 ounces but the serving size is 8, which means there are 2 servings per bottle. Let's use this proportion to calculate the calories and sodium.

Note: This question is incomplete; here is the possible missing section:

What are the total calories and sodium in this apple juice?

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the answer is z = 47.214

Answer:

z = 47.214

Hope this helped

Answer:

1) Carrying capacity is the maximum number of individuals of a species that an environment can support.

2) Population - all the inhabitants of a particular town, area, or country.

3) An increase in population will inevitably create pressures leading to more deforestation, decreased biodiversity, and spikes in pollution and emissions, which will exacerbate climate change.

4) The three leading causes of population growth are births, deaths, and migration. Births and deaths are seen as natural causes of population change.

Answer: The answer is True

Explanation:

The answer is true because Walking, biking, and reusing paper helps the economy

Answer:

Nvr XD

Explanation:

Answer:

the world may never know

Explanation:

If the radius of sulfide ion is 0.184 nm, then  the radius, in nm, of the calcium ion will be 0.184nm.

To determine the radius of the calcium ion, we can use the ionic radius ratio rule, which states that the ratio of the ionic radii of two ions in an ionic compound is approximately equal to the ratio of their coordination numbers. In a face-centered cubic unit cell, both calcium and sulfide ions are surrounded by six other ions, so the coordination number for both is 6. Therefore, the ionic radius ratio of calcium to sulfide is approximately equal to 1.

Let's call the radius of the calcium ion "r". Then, we have:

r / 0.184 nm = 1

Solving for r:

r = 0.184 nm

So the radius of the calcium ion is approximately 0.184 nm.

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The osmotic pressure of the 9.45 mM aqueous solution of MgCl₂ at 20 degrees Celsius is approximately 0.2336 atm.

To calculate the osmotic pressure of a solution, we can use the equation;

π = MRT

Where:

π = osmotic pressure (in pascals or N/m²)

M = molarity of solution (in mol/L or M)

R = ideal gas constant (8.314 J/(mol·K) or 0.0821 L·atm/(mol·K))

T = temperature (in Kelvin)

First, we need to convert the given concentration of MgCl₂ from millimolar (mM) to molarity (M). Since 1 mM = 0.001 M, the concentration becomes;

M = 9.45 mM × 0.001 = 0.00945 M

Next, we will convert the temperature from Celsius to Kelvin:

T = 20 + 273.15=293.15 K

Now we calculate the osmotic pressure;

π = (0.00945 M) × (0.0821 L·atm/(mol·K) × (293.15 K)

Simplifying the equation;

π = 0.2336 atm

Therefore, the osmotic pressure of the 9.45 mM aqueous solution of MgCl₂ at 20 degrees Celsius is approximately 0.2336 atm.

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Type II alveolar cells are critical for maintaining the structure and function of the alveoli and for ensuring efficient gas exchange in the lungs.

The walls of the alveoli in the lungs are composed of two main types of cells, type I and type II alveolar cells. Type II alveolar cells, also known as septal cells or Type II pneumocytes, have several important functions in the lungs, including:

Production of surfactant: Type II alveolar cells secrete a substance called surfactant, which helps to reduce surface tension in the alveoli and prevent their collapse during exhalation. This is crucial for maintaining efficient gas exchange in the lungs.

Stem cell function: Type II alveolar cells are also thought to act as stem cells in the lungs, helping to regenerate damaged or injured lung tissue.

Immune function: Type II alveolar cells can also act as immune cells in the lungs, playing a role in the body's defense against pathogens and other foreign substances.

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Out of the molecules F₂, B₂, O₂, N₂, only O₂ is paramagnetic. Therefore, the correct answer is (B) 1. Paramagnetic substances have unpaired electrons in their molecular orbitals.

In O₂, there are two unpaired electrons, which makes it paramagnetic. On the other hand, F₂, B₂, and N₂ have all of their electrons paired in their molecular orbitals, making them diamagnetic. Diamagnetic substances do not exhibit any unpaired electrons and are weakly repelled by a magnetic field.

O₂ is the only molecule among the given options that is paramagnetic due to its unpaired electron configuration, while F₂, B₂, and N₂ are diamagnetic as they have all of their electrons paired in their molecular orbitals.

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Answer:

Explanation:

4.5x10x10x10x10x10 can be written as 4.5^5, by the way.

The sum of 4.5^5 is 450,000.

450,000 divided by 300 is 1500.

Hope this helps!

Explanation:

4.5×10×10×10×+0×10=4500000

450000÷300

remove zeros

4500÷3

=1500

Answer:

34.611g

Explanation:

mass of metal = ?

density of metal = 1.39/cm³

volume = 24.9 cm³

density = mass/volume

mass = density × volume

= 1.39g/cm³ × 24.9 cm³

= 34.611g

Answer:

Explanation:

(a) The pH of 0.00327 M HI can be calculated as follows:

HI → H+ + I-

Since HI is a strong acid, it dissociates completely in water, giving H+ ions. Thus, the [H+] concentration is equal to the initial acid concentration:

[H+] = 0.00327 M

The pH can be calculated as:

pH = -log[H+]

= -log(0.00327)

= 2.484

Therefore, the pH of 0.00327 M HI is 2.484.

(b) The number of moles of HCl in 0.649 g can be calculated as follows:

molar mass of HCl = 1 g/mol + 35.5 g/mol = 36.5 g/mol

moles of HCl = mass/molar mass = 0.649 g/36.5 g/mol = 0.0178 mol

The molarity of the HCl solution is:

Molarity = moles/volume = 0.0178 mol/46.0 L = 0.000387 M

Since HCl is a strong acid, it dissociates completely in water, giving H+ ions. Thus, the [H+] concentration is equal to the initial acid concentration:

[H+] = 0.000387 M

The pH can be calculated as:

pH = -log[H+]

= -log(0.000387)

= 3.412

Therefore, the pH of 0.649 g of HCl in 46.0 L of solution is 3.412.

(c) The initial number of moles of HI is:

moles of HI = concentration × volume = 7.30 M × 0.0670 L = 0.4891 mol

After dilution, the final concentration of HI is:

final concentration = initial concentration × (initial volume/final volume)

= 7.30 M × (0.0670 L/1.60 L)

= 0.306 M

Since HI is a strong acid, it dissociates completely in water, giving H+ ions. Thus, the [H+] concentration is equal to the initial acid concentration:

[H+] = 0.306 M

The pH can be calculated as:

pH = -log[H+]

= -log(0.306)

= 0.513

Therefore, the pH of the diluted solution is 0.513.

(d) The number of moles of HI and HCl in the mixture can be calculated as follows:

moles of HI = concentration × volume = 0.00246 M × 0.0190 L = 4.674 × 10^-5 mol

moles of HCl = concentration × volume = 0.00871 M × 0.0440 L = 0.000383 mol

The total volume of the mixture is:

total volume = 0.0190 L + 0.0440 L = 0.0630 L

The total number of moles of acid in the mixture is:

total moles of acid = moles of HI + moles of HCl

= 4.674 × 10^-5 mol + 0.000383 mol

= 0.00043 mol

The molarity of the acid mixture is:

Molarity = total moles of acid/total volume = 0.00043 mol/0.0630 L = 0.00683 M

Since the mixture contains both HI and HCl, the pH cannot be calculated directly. However, since both are strong acids, they will dissociate completely

The atomic mass of aluminum (Al) is approximately 26.98 amu. Therefore, the mass of one Al atom is 26.98 amu.

To calculate the mass of 75 Al atoms, we can multiply the mass of one Al atom by 75:

Mass of 75 Al atoms = 75 atoms x 26.98 amu/atom

Mass of 75 Al atoms = 2024.5 amu

Therefore, the mass of 75 Al atoms is 2024.5 amu.

Answer:

Vanadium

Explanation:

Atomic number increases, thereby changing into an atom of Vanadium

Answer:

Vanadium

Explanation:

Science rocks

A system of linear equations to balance the following chemical reaction:

Limestone, CaCO₃, neutralizes the acid, H₃ O, in acid rain is:

2H₃O + CaCO₃ → 3H₂O + Ca + CO₂

To balance the chemical equation:

H₃O + CaCO₃ → H₂O + Ca + CO₂

We need to ensure that the number of atoms of each element is the same on both sides of the equation.

Let's assign variables to the coefficients of each compound:

H₃O: x

CaCO₃: y

H₂O: z

Ca: a

CO₂: b

Now, we can set up the system of equations based on the number of atoms for each element:

For hydrogen (H):

3x = 2z

For oxygen (O):

3x + 3y = 2z

For calcium (Ca):

y = a

For carbon (C):

y = b

For calcium (Ca):

a = 1

Solving this system of equations will give us the balanced coefficients. Let's solve it:

From the equation y = a, we have y = 1.

From the equation y = b, we have b = 1.

Substituting b = 1 into the equation 3x + 3y = 2z, we have:

3x + 3 = 2z

From the equation 3x = 2z, we have x = (2/3)z.

Substituting x = (2/3)z into the equation 3x = 2z, we have:

3(2/3)z = 2z

2z = 2z

This equation is true for any value of z, indicating that z can take any value.

Therefore, we can choose z = 3 to simplify the coefficients:

x = (2/3)z = (2/3)(3) = 2

y = 1

z = 3

a = 1

b = 1

Thus, the balanced equation is:

2H₃O + CaCO₃ → 3H₂O + Ca + CO₂

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Answer:

B-Sorry if this isn't right :/ Good luck.

Explanation:

Answer:

D. Scoot

Explanation:

Grew, Rude and truth all have the sound /OO/ scoot follows that pattern.

According to Bohr's model, electron emit electromagnetic radiation when  an electron moves from the higher energy orbit to the lower energy orbit of an atom.

Niels Bohr (1885–1962) proposed a model for the hydrogen atom that explained its atomic emission spectrum.

According to the Bohr model of the atom:

1. Energy levels of electrons are discrete (certain discrete values of energy), that is why hydrogen shows discrete, bright, colored lines.

2. Electrons orbit the nucleus in orbits that have a set size and energy.

3. Electrons can jump from one energy level to another, absorbing or emitting electromagnetic radiation with a frequency ν (energy difference of the levels).

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Answer:

A solid has a definite shape and volume.

Solids in general have higher density.

In solids, intermolecular forces are strong.

Diffusion of a solid into another solid is extremely slow.

Solids have high melting points.

Explanation:

Solids have definite shape and volume with closely packed molecules inside. They are not easily compressed, because they are already in a compressed state with less volume for movement. Thus options A, E and F are correct.

Matter can have three states namely solids, liquids and gases. These states can be interchanged into others with proper conditions. In solid states, the molecules of the substance are closely packed and they are unable to move apart.

Liquid molecules are slightly apart from each other and thus they can move apart and does not have definite shape but have definite volume. In gaseous state, molecules are far away from each other and they diffuses in the atmosphere.

Due to the compressed or close alignment of molecules with orderly arrangement,  solids have definite shape and volume. Therefore options A, E and F are correct.

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Your question is incomplete but, your complete question probably was:

Which of the following characteristics best describe the properties of solids? Select all that apply.

A. Not easily compressed

B. Easily compressed into a smaller volume

C. Takes the shape of its container

D. Has indefinite shape and fixed volume

E. Has definite shape and volume

F. Particles are packed tightly together, often in an orderly arrangement

G. Expands to fill any volume

A homogeneous mixture, also known as a solution, is created when two or more components are combined to produce a combination. The solute and the solvent are the two substances that are combined.

The material that is being dissolved is known as the solute, whereas the substance that dissolves the solute is known as the solvent.

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A container of helium is at 40°C with a volume of 2. 55 L. The temperature must be 280.81°C raised to for the volume to be 4. 50 L.

Using the combined gas law, we can find the temperature change needed to achieve a volume of 4.50 L:

(P1V1/T1) = (P2V2/T2)

At the start, P1 = P2 since the pressure is constant. So we can simplify the equation:

(V1/T1) = (V2/T2)

Plugging in the given values, we get:

(2.55 L)/(313.15 K) = (4.50 L)/T2

Solving for T2, we get:

T2 = (4.50 L x 313.15 K) / 2.55 L

T2 = 553.81 K

Converting to Celsius, we get:

T2 = 280.81°C

Therefore, the temperature must be raised to 280.81°C for the volume to be 4.50 L.

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6.94 is much more closet to 7.016, so Li 7 is more abundant

Answer:

It looks like A is the correct answer. Cu + H2O → CuO + H2

Explanation:

i hope this helps 229 999 0523

Answer:

Hippocampus

Explanation:

The main parts of the brain involved with memory are the amygdala, the hippocampus, the cerebellum, and the prefrontal cortex.

Memory impairment from marijuana use occurs because THC alters how the hippocampus, a brain area responsible for memory formation, processes information.

To 2 significant figures should the calculated density of the sample be expressed.

Density is the amount of mass per unit of volume. The symbol most often used for density is ρ although the Latin letter D can also be used. The density of a material varies with temperature and pressure. This variation is small for solids and liquids but much greater for gases. Increasing the pressure on an object decreases the volume of the object and thus increases its density. Increasing the temperature of a substance  decreases its density by increasing its volume.

                   Density = mass / volume

                  ρ = m V.

Density has the SI units of kilogram per cubic meter or gram per cubic centimeter. It is a useful quantity in calculating for the mass of fluids.

A sample of an element has a mass of 34.261 grams and a volume of 3.8 cubic centimeters.

  mass = 34.261 grams

  Volume =  3.8 cubic centimeters

Density = 34.261 g / 3.8 cm3

             = 9.0160526

             = 9.0 g/ cm3  ( aprox.)

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Answer:Which of the following can be formed by physically combining pure substances?a. an element c. a compound b. a mixture d. all of the above Weegy: It is true.The formula for Density is Mass divided Volume.

Explanation:

Answer:

It is B. a mixture

Explanation:

A is wrong because an element is part of a compound and can't be physically mixed, C is wrong because atm don't jin by just physically mixing then there must be a change in smething at the physical level

also correct on edg.