What the name for the color of the powder left behind when a mineral is rubbed across a hard surface? A. luster B. streak C. tenacity D. fracture

The energy transferred is  28.5  j

calculation

energy is calculate  MCΔT  formula  where,

M(mass)= 6.30  grams

C(specific heat capacity)= 0.377 j/g

ΔT(change in temperature)= 32.0c- 20 c= 12 c

Energy is therefore= 6.30 g   x 0.377  j/g /c x   12 c =28.5 j

The energy transferred is 28.5  j.

A nonpartisan iota of Nitrogen has a mass of 18. There are 7 protons in the core of this iota. What number of neutrons, complete electrons, and valence electrons are available  

Nitrogen 15 has a nuclear mass of 15. The mass number is # protons in addition to # of neutrons, so for N-15 mass is 15 and the protons are dependably 7 so there must be 15-7=8 neutrons. N-15 has 7 electrons since it has 7 protons and p = e.

Final answer:

To find the total pressure in the container, calculate the moles of each gas, use the ideal gas law to find the partial pressures, and then sum them up.

Explanation:

To find the total pressure in the container, we need to calculate the partial pressures of each gas and then sum them up.

First, we calculate the moles of each gas using their molar masses:

He: 1.00 g / 4.0026 g/mol = 0.2499 mol

F2: 14.0 g / 38.0 g/mol = 0.3684 mol

Ar: 19.0 g / 39.948 g/mol = 0.4755 mol

Next, we use the ideal gas law to calculate the partial pressures:

He: P(He) = (moles of He) x (R) x (temperature) / (volume) = (0.2499 mol) x (0.0821 L atm/mol K) x (293.0 K) / (13.0 L) = 0.498 atm

F2: P(F2) = (moles of F2) x (R) x (temperature) / (volume) = (0.3684 mol) x (0.0821 L atm/mol K) x (293.0 K) / (13.0 L) = 1.064 atm

Ar: P(Ar) = (moles of Ar) x (R) x (temperature) / (volume) = (0.4755 mol) x (0.0821 L atm/mol K) x (293.0 K) / (13.0 L) = 1.276 atm

Finally, we sum up the partial pressures to get the total pressure in the container:

Total pressure = P(He) + P(F2) + P(Ar) = 0.498 atm + 1.064 atm + 1.276 atm = 2.838 atm

All the elements you listed share a common trait: they are synthetic, radioactive elements. These elements do not have a stable isotope, so for a radioactive element, its most stable isotope's atomic mass will be listed in parentheses.

One such example would be plutonium. This element has 6 different isotopes with differing half-lives. The most stable isotope for plutonium is plutonium-244, with a half-life of around 80 million years. Therefore, the atomic mass listed for plutonium will be (244).

Hey there!:

Given % of Mn=59.1% means 59.1 g of Mn present in 100 g of manganese fluoride.

Molar mass of Mn= 54.938 g/mol

Moles of Mn = mass / molar mass

59.1 /54.938 => 1.07 ≈ 1 mol.

and % of F=40.9% means 40.9 g of of F present in 100 g of manganese fluoride.

Molar mass of F=18.998 g/mol

Moles of F :

40.9 / 18.999 => 2.15 mol ≈ 2 mol.

The mole ratio between Mn:F=  1 : 2

Therefore the empirical formula of manganese fluoride:

=> MnF2=Mn1F2

Hope that helps!

Answer :  The empirical formula of manganese fluoride is [tex]Mn_1F_2[/tex].

Solution :  Given,

If percentage are given then we are taking total mass is 100 grams.

So, the mass of each element is equal to the percentage given.

Mass of Mn = 59.1 g

Mass of F = 40.9 g

Molar mass of Mn = 54.94 g/mole

Molar mass of F = 18.99 g/mole

Step 1 : convert given masses into moles.

Moles of Mn = [tex]\frac{\text{ given mass of Mn}}{\text{ molar mass of Mn}}\times 1\text{ mole of Mn}[/tex] = [tex]\frac{59.1g}{54.94g/mole}\times 1\text{ mole of Mn}[/tex] = 1.076 moles

Moles of F = [tex]\frac{\text{ given mass of F}}{\text{ molar mass of F}}\times 1\text{ mole of F}[/tex] = [tex]\frac{40.9g}{18.99g/mole}\times 1\text{ mole of F}[/tex] = 2.154 moles

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For Mn = 1.076/1.076 = 1

For F = 2.154/1.076 ≈ 2

Mn : F = 1 : 2 

The mole ratio of the element is represented by subscripts in empirical formula.

Therefore, the Empirical formula = [tex]Mn_1F_2[/tex]

Physical properties are the traits of an object that can be readily seen such as size, color and state. Measuring or changing these properties does not affect the chemical nature of the matter. For example, a paper that is cut into small pieces has undergone a physical change. The pieces have a different quantity, size, shape and texture than the original sheet.

Chemical properties are the characteristics that describe the composition of matter. These traits are carried by each individual atom, or part of matter. Some examples of chemical properties include combustibility, flammability and reactivity. Another way to look at this is to think of the chemical properties as potentials. Dry paper has the potential to burn; this is flammability, a chemical property. Magnesium metal has the potential to combine with oxygen and form Magnesium Oxide.

The elements whose electron configurations end with f electrons are in the Lanthanide and Actinide series: those long series at the bottom of the Periodic Table (see image).

The atoms are adding electrons into f orbitals, but the f electrons are not always the last electrons in the electron configuration.

For example, the electron configuration of Eu is [Xe]6s²4f⁷, but that of Gd

is [Xe] 6s²4f⁷5d.

I have blocked off in red all the exceptions like Gd.

If it was HNO3 then it would be Nitric Acid (ic)

But it is HNO2 and that is Nitrous Acid (ous)

The less joiners is ''OUS''

The more joiners is ''IC'' .

Finally the answer is Nitrous acid.

Nitrous acid, with the formula HNO₂, is a weak acid significant in many chemical processes and cannot be isolated in pure form. It is used for the production of hydroxylamine, diazotizations, and the synthesis of various compounds such as azo dyes and drugs. Nitrous acid also forms specific coordination compounds with NO₂ acting as either a nitro or nitrito ligand.

The acid with the formula HNO₂ is known as nitrous acid. Nitrous acid is a weak acid with a pKa of 3.15 at 25°C and it cannot be isolated in pure form.

It primarily exists in aqueous solutions and is a significant reagent in various chemical processes including the production of hydroxylamine (NH₂OH), diazotization of aromatic amines, and the manufacture of azo dyes and drugs. Moreover, nitrous acid plays a role in the chemistry of coordination compounds, where NO₂ can act as a monodentate nitro (N-coordination) or nitrito (O-coordination) ligand.

Other oxoacids of nitrogen include nitric acid (HNO₃), which is also an essential acid in the chemical industry. Nitric acid is stronger than nitrous acid and is produced through the Ostwald process, which eventually oxidizes ammonia to NO₂, and subsequently to nitric acid.

n = number of mole of sample of helium gas = 7.16 x 10⁻⁴ moles

T = temperature of the gas = temperature of the bulb ?

V = Volume of helium gas = 75 mL = 7.5 x 10⁻⁵ m³

P = pressure of the helium gas = 116.8 kPa = 116.8 x 10³ Pa      (1 k = 1000)

Using the equation

P V = n R T

inserting the values

(116.8 x 10³) (7.5 x 10⁻⁵) = (7.16 x 10⁻⁴) (8.314) T

T = 1471.6 C

Answer: 1470 K

Explanation: It asks to calculate the kelvin temperature of the light bulb. Looking at the given info, it is based on ideal gas law equation, PV=nRT.

Given:

V = 75.0 mL = 0.0750 L

P = 116.8 kPa

We know that 101.325 kPa = 1 atm

So,

= 1.15 atm

R is universal gas constant and its value is  .

T = ?

Let's plug in the values in the equation and solve it for T.

0.08625 = 0.00005878(T)

T = 1467 K

So, the temperature of the light bulb would be 1467 K, but since we have to round the total to equal 3 significant figures, the answer is 1470 K

Final answer:

The chemical formula for monosaccharides is CnH2nOn, where n can be any number greater than two. Glucose, a common monosaccharide, has a molecular formula of C6H12O6. Monosaccharides can exist as linear chains or as ring-shaped molecules, with glucose having two different arrangements of the hydroxyl group in its ring form.

Explanation:

The chemical formula for monosaccharides is CnH2nOn, where n can be any number greater than two. For example, glucose, a common monosaccharide, has a molecular formula of C6H12O6.

Monosaccharides can exist as linear chains or as ring-shaped molecules. In-ring forms, glucose can have two different arrangements of the hydroxyl group (OH) around the anomeric carbon. If the hydroxyl group is below carbon number 1 in the sugar, it is in the alpha (α) position, and if it is above the plane, it is in the beta (β) position.

The ring-forming reaction between the hydroxyl group and the carbonyl group occurs at carbon number 1, which is the anomeric carbon.

Answer is: 1s22s22p5.

1) Electron configuration 1s²1p⁶2d², this is not reasonable because 1p and 2d oritals do not exist.

2) Electron configuration 1s²2s⁴2p⁶, this is not reasonable because s orbitals only contain 2 electrons.

3) Electron configuration 1s²2s²2p⁵ is of an element fluorine. Fluorine (F) has atomic number 9, which means it has 9 protons and 9 electrons.

4) Electron configuration 1s²2s²2d⁶, this is not reasonable because 2d orbitals do not exist.

Answer: If the atom loses 2 electrons, the net charge on the atom will be 2+

If the atom gains 4 electrons, the net charge on the atom will be 4-

Explanation:

An atom is smallest unit of a matter or substance.It consist of three subatomic particles : electrons, protons, neutrons.

Protons are positively charged, neutrons are neutral and both are located in nucleus where mass of an atom is concentrated.

Electrons are negatively charged and are located outside the nucleus where they orbit in different energy levels around the nucleus.

In an atom, when electrons are lost, the atom gains a positive charge and forms cation. In an atom, when electrons are gained, the atom occupies a negative charge and forms anion.

Thus an atom with 9 electrons and 9 protons will be electrically neutral.

On losing 2 electrons, there will be 7 electrons and 9 protons will have 2+ charge.On gaining 4 electrons, there will be 13 electrons and 9 protons will have 4- charge.

The substances C3H8 and 5O2 are the reactants and 3CO2 and 4H2O are the products in the equation. These reactants combine to form the products in a process known as a chemical reaction, more specific, a combustion reaction.

The correct answer is C: The substances C3H8 and 5O2 are reactants that react to form the products 3CO2 and 4H2O. In a chemical reaction, the reactants are the substances that start the process, and they are normally written on the left side of a chemical equation. The products are the substances that are produced, and they are usually written on the right side of the chemical equation.

For instance, in the chemical equation you've mentioned (C3H8 + 5O2 -> 3CO2 + 4H2O), the reactants - propane (C3H8) and oxygen (5O2) combine to form carbon dioxide (3CO2) and water (4H2O). Hence, the reactant side has C3H8 and 5O2, while the product side has 3CO2 and 4H2O. This reaction is an example of a combustion reaction.

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Steps:

Mw = w * R * T / p * V

T = 88 + 273 => 361 K

p = 975 mmHg in atm :

1 atm  = 760 mmHg

975 mmg / 760 mmHg =>  1.28 atm

Therefore:

= 0.827 * 0.0821 * 361 /  1.28 * 0.270

=  24.51 / 0.3456

molar mass =  70.92 g/mol

Answer:

The molar mass of the gas is 70.83 g/mol.

Explanation:

Mass of the gas m= 827 mg = 0.827 g

Molar mass of gas = M

Pressure of the gas = 975 mmHg = 1.28 atm

Temperature of the gas = 88^C=  361 K

Using idal gas equation:

[tex]PV=nRT[/tex]

[tex]PV=\frac{m}{M}\times RT[/tex]

[tex]M=\frac{mRT}{PV}[/tex]

[tex]M=\frac{0.827 g\times 0.0820 atm L/mol K\times 361 K}{1.28 atm \times 0.270 L}=70.83 g/mol[/tex]

The molar mass of the gas is 70.83 g/mol.

There would be a decrease in consumers and decomposers.

Removing producers would slowly but surely cause the entire food web to tumble. With this in mind - we can say that the answer is A (There would be a decrease in consumers and decomposers) - because everything will lessen with the removal of producers.

The powdered juice mix quickly dissolves in the water, indicating that it forms a solution. Stirring the mixture can increase the rate of dissolution. The fact that the mix dissolves again when more is added suggests that the solution was not saturated.

The fact that the powdered juice mix quickly dissolves when added to the cup of water suggests that it forms a solution with the water. A solution is a homogenous mixture in which the solute particles are very small and become uniformly dispersed throughout the solvent. The rate of dissolution can be increased by stirring the mixture, which allows fresh solvent molecules to continually come into contact with the solute. Additionally, the fact that the mix quickly dissolves again when more is added suggests that the solution was not saturated and still had room for more solute to be dissolved.

Final answer:

The powdered juice mix forms a stable solution with the water, as indicated by its quick and complete dissolution. The act of stirring increases the rate of dissolution by allowing fresh solvent molecules to interact with the solute particles. The solution remains stable, without any settling or changes, and can pass through a filter without any separation.

Explanation:

The quick dissolution of the powdered juice mix in the cup of water indicates that it forms a stable solution. When a solute, such as the juice mix, is fully dissolved in a solvent, like water, it creates a homogeneous mixture called a solution. In this case, the solute particles in the juice mix are very small, allowing them to dissolve easily in the water.

Stirring the solution aids in dissolving more of the juice mix because it increases the frequency of collisions between the solvent molecules (water) and the solute particles (juice mix), increasing the rate of dissolution. Agitating the solution ensures that fresh solvent molecules continuously come into contact with the solute, speeding up the process.

By observing the quick dissolution of the juice mix and its ability to stay in solution without settling or changing upon passing through a filter, we can conclude that the juice powder and water solution forms a stable and fully dissolved mixture.

The answer is metallic and nonmetallic.

Answer:

The answer is C. Metallic and Non-metallic.

Explanation:

Luster is a physical property that shows how light acts on the surface of a material and how it is reflected in it. The main types of brightness are:

Answer: B

Explanation: PLATO

Hello!

The formula is density =  mass / volume

                    => volume = mass / density

volume = ?

mass = 2500.0 g

density = 10.5 g/cm3

volume = mass / density

volume = 2500.0 g / 10.5 g/cm3

volume = 2380.95 cm3

Hope this help!

The volume of silver that weighs exactly 2500.0 g is approximately 238.095 cm³, if the density of silver as 10.5 g/cm³.

To find the volume of silver that weighs exactly 2500.0 g, we use the formula for density, which is:

Density = Mass / Volume

Given the density of silver as 10.5 g/cm³, we can rearrange the formula to solve for volume:

Volume = Mass / Density

Substituting the given values:

Volume = 2500.0 g / 10.5 g/cm³

Volume ≈ 238.095 cm³

This means that a volume of approximately 238.095 cm³ of silver will weigh 2500.0 g.

pH = 4.82

[H⁺] = 1.5 × 10⁻⁵ mol·L⁻¹.

pH = -log[H⁺] = -log(1.5 × 10⁻⁵) = 4.82

Answer: A) See which cup feels heavier.

Explanation:

Density is defined as the mass contained per unit volume.

[tex]density=\frac{mass}{volume}[/tex]

Thus if a liquid is more denser than water, it contains more mass per unit volume and thus feel heavier.

We cannot taste or touch liquids as the liquid can be corrosive.

Both the liquids can be polar and thus both can dissolve ionic compound i.e salt in it.

Thus the other liquid that has greater density than water feels heavier than water.

B. 297.1 g/mol

Is your answer! ;)

Answer: Option (B) is the correct answer.

Explanation:

Molar mass is defined as the sum of atomic mass of all the atoms present in a compound.

For example, atomic mass of barium (Ba) is 137.32 g/mol and atomic mass of a bromine atom is 79.90 g/mol.

Therefore, calculate molar mass of [tex]BaBr_{2}[/tex] as follows.

                   Molar mass = atomic mass of Ba + 2 [tex]\times atomic mass of Br[/tex]

                                       = [tex]137.32 g/mol + 2 \times 79.90 g/mol[/tex]

                                       =  297.12 g/mol

Therefore, we can conclude that molar mass of [tex]BaBr_{2}[/tex] is 297.1 g/mol.

Answer: The answers are A C E. I took the test.

Explanation:

The change in pitch of the firetruck's siren as it gets closer to the observer is due to the Doppler effect. As the firetruck approaches, the siren's pitch appears to increase, and as it moves away, the pitch appears to decrease. This phenomenon can be observed with passing cars, airplanes, and trains as well.

The change in pitch of the siren as the firetruck gets closer is due to the Doppler effect. This effect describes the change in frequency of a sound wave or light wave as the source of the wave or the observer of the wave moves relative to each other.

In the case of the firetruck siren, as the firetruck approaches Sal, the pitch of the siren appears to increase because the sound waves are compressed, resulting in a higher frequency. As the firetruck moves away from Sal, the pitch appears to decrease because the sound waves are stretched, resulting in a lower frequency.

This change in pitch can also be observed with passing cars, airplanes, and trains, where the pitch decreases as they move away from the observer. The faster the firetruck (or any moving source) moves, the greater the shift in pitch.

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As the firetruck moves towards Sal, [tex]\( v_s \)[/tex] is negative (since it is moving towards the observer), which results in [tex]\( f' \)[/tex] being greater than [tex]\( f \)[/tex], indicating a higher pitch. Once the firetruck passes Sal and moves away, [tex]\( v_s \)[/tex] becomes positive, and the pitch Sal hears decreases, becoming lower than the emitted frequency.

The phenomenon Sal observed is known as the Doppler effect. As the firetruck approached Sal, the pitch of the siren got higher due to the Doppler effect.

The Doppler effect is a change in frequency or wavelength of a wave in relation to an observer who is moving relative to the wave source. This effect is commonly experienced with sound waves, such as the siren of an approaching firetruck.

When the firetruck is moving towards Sal, each successive sound wave is emitted from a position closer to Sal than the previous one. This causes the waves to be compressed in front of the firetruck, leading to a higher frequency of sound waves reaching Sal's ears. Since frequency is perceived as pitch, the siren sounds higher in pitch as the firetruck approaches.

Mathematically, the Doppler effect can be described by the following equation for sound waves:

[tex]\[ f' = \left( \frac{v + v_o}{v + v_s} \right) f \][/tex]

where:

[tex]- \( f' \)[/tex] is the observed frequency (the pitch Sal hears).

[tex]- \( f \)[/tex] is the emitted frequency (the actual pitch of the siren).

[tex]- \( v \)[/tex] is the speed of sound in air.

[tex]- \( v_o \)[/tex]is the speed of the observer (in this case, Sal is stationary, so[tex]\( v_o = 0 \))[/tex].

[tex]- \( v_s \)[/tex] is the speed of the source (the firetruck).

The following answers are A, C, and F

Molecules are composed of two or more atoms and can vary greatly in size. They can be made of either the same or different elements. Examples include O₂ for the same element and H₂O for different elements.

Let's review each statement to determine whether it accurately describes molecules: