what is the mass of 1.75 moles of HF?

The balanced equation for the reaction between copper and nitric acid is:3 Cu + 8 HNO3 → 3 Cu(NO3)2 + 2 NO + 4 H2OThe above equation is balanced, meaning that there are equal numbers of atoms of each element in the reactants and products.

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Answer:

O2 + 4e- -> 2O2-

Explanation:

You have to start by assigning the oxidation numbers, which eventually will lead to every atom of oxygen taking 2 electrons and every molecule of oxygen will take 4 electrons.

(you can ignore this explanation, my answer wasn't long enough).

Answer:

Light travels as a wave.

Explanation:

But unlike sound waves or water waves, it does not need any matter or material to carry its energy along. This means that light can travel through a vacuum—a completely airless space. (Sound, on the other hand, must travel through a solid, a liquid, or a gas.)

Fe2S3 is The Empirical Formula Of A Compound Containing 53.70% Iron And 46.30% Sulfur.

Fe = 0.961 mol and S = 1.44 mol, Now divide them to get lowest empirical formula. When the subscripts in a chemical formula represent the simplest ratio of the kinds of atoms in the compound, the formula is called an empirical formula.

Most ionic compounds are described with empirical formulas. A molecular formula describes the actual numbers of atoms of each element in a molecule. A compound that contains ions and is held together by ionic bonds is called an ionic compound. The periodic table can help us recognize many of the compounds that are ionic:

When a metal is combined with one or more nonmetals, the compound is usually ionic. This guideline works well for predicting ionic compound formation for most of the compounds typically encountered in an introductory chemistry course. However, it is not always true (for example, aluminum chloride, AlCl3, is not ionic).

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Answer:

Covalent bonding occurs when pairs of electrons are shared by atoms. Atoms will covalently bond with other atoms in order to gain more stability, which is gained by forming a full electron shell. By sharing their outer most (valence) electrons, atoms can fill up their outer electron shell and gain stability.

Answer: Place a piece of white paper under the analyte flask throughout the titration

Explanation:

The end point of titration can be made easy by the use of indicators. But we have to be keenly observe for each drop from the burette because, the colour change will be sudden for a drop.

Titration is an analytical technique used to determine the unknown concentration using a standard reagent of known concentration. The standard reagent of known concentration is called titrant and the  one to be determined is called analyte.

Usually analyte is taken in a conical flask and titrant in a burette. The end point of titration is the point at which the reaction is completed in perfect stoichiometry.

In acid-base titrations, the indicators used having different colors in different pH. Hence, the indicator in the analyte will change in color when the acidity of the medium changes. We have to observe keenly for the color change because it happens for any drop.

The adding of titrant from the burette must be dropwise and thus we can get a time to notice the sudden colour change of indicator.

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Answer:what grade this is

Explanation:

Answer:

It will be solid

Explanation:

-78 C° is the freezing point of carbon dioxide, so at the temperature of -78 Celsius, the particles of carbon dioxide will come closer together and have about a fixed position to vibrate. The carbon dioxide will turn into solid. The solid form of carbon dioxide is also called dry ice.

Answer: They use their feathers

Explanation: They fluff their feathers for warmth I think so at least

Because I'm sure they stay in the forest and don't really hibernate

Answer:

They fluff there feathers for warmth

Explanation:

I did the test and got 100

Performing a pirouette standing up without faltering requires practice, balance, and technique. Here are some steps to help you improve your pirouette technique:

Proper Alignment: Start by standing tall with a good posture. Align your body by stacking your head, shoulders, hips, and feet in a straight line.

Spotting: Choose a spot in front of you and fix your gaze on it throughout the pirouette. Spotting helps maintain balance and prevents dizziness.

Preparation: Start in a relevant ballet position, such as the fourth or fifth position. Make sure your supporting leg is strong and stable.

Plie: Begin with a plie, which is a bending of the knees. This will help generate energy for the turn and provide a solid base.

Arm Placement: Position your arms in a way that supports your balance. In ballet, common arm positions for pirouettes include rounded arms in front of your body or extended to the side.

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According to Avogadro's Number there are 6.022 * 10²³ atoms in 1 mol of atoms. So:

1 mol of atoms of P = 6.022 * 10²³ atoms of P

We are asked to find the number of moles that we have in 3.20 * 10²⁵ atoms of phosphorus.

number of moles = 3.20 * 10²⁵ atoms of P * 1 mol of P /(6.022 * 10²³ atoms of P)

number of moles of P = 53.1 moles

Then the answer to our problem is 53.1 moles.

Answer:

8.90

Explanation:

Density = mass ÷ volume

D = 222.50 g ÷ 25.00

= 8.9

The density of the unknown metal is 8.90.

Hope that helps.

Answer:

C: 8.90

Explanation:

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The oxidation state of Fe in Fe− is -1 and in Fe(CO)4 it is 0. When Fe(CO)5 is heated with excess I2, it undergoes oxidative addition and Fe's oxidation state changes to +2 in Fe(CO)4I2.

To determine the oxidation state of each metal species in the given reactions, let's follow these steps The oxidation state of Fe in the given reactions is as follows ,In Fe: 0 , In Fe(CO)5: 0 . In Fe(CO)4I2: +2

In Fe, the oxidation state is 0, as it is in its elemental form. In Fe(CO)5, the oxidation state of Fe is 0 because CO is a neutral ligand, and the overall charge on the complex is 0. In Fe(CO)4I2, the oxidation state of Fe is +2. The CO ligands are neutral, and the two iodine atoms have a -1 charge each, resulting in an overall charge of -2. To maintain a neutral molecule, Fe must have a +2 oxidation state.

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Answer:

The purpose of all seed is reproduction and is to grow a new plant, thus propagating the species.

Two blocks of platinum have a temperature of 200 Celsius. Both the blocks have the same amount of thermal energy because both are metals which conducts heat energy throughout their bodies.

Conduction is the process by which heat energy is transmitted between neighboring atoms or molecules. We know that metals are the good conductors of heat and electricity so if one part absorb heat, it will spread to the whole body so we can conclude that the thermal energy will remain the same amount throughout the whole body.

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The total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.

To calculate the total charge that flows while the battery is being charged, we can use the relationship between electrical energy, potential difference, and charge.

The electrical energy (E) stored in the battery is given as 64 mega Jules (64 MJ). The potential difference (V) provided by the battery is 330 volts. We know that the energy (E) is equal to the product of the potential difference (V) and the charge (Q):

E = V * Q

Since the charging process is 100% efficient, all the electrical energy supplied is stored in the battery. Therefore, we can rearrange the equation to solve for the charge (Q):

Q = E / V

Substituting the given values, we have:

Q = 64 MJ / 330 V

To perform the calculation, we need to convert mega Jules (MJ) to joules (J) since the SI unit of energy is joules. One mega Joule is equal to 1 million joules:

Q = (64 * 10^6 J) / 330 V

Calculating the division:

Q ≈ 193,939.39 Coulombs

Therefore, the total charge that flows while the battery is being charged is approximately 193,939.39 Coulombs.

This value represents the quantity of electric charge transferred during the charging process, and it indicates the amount of electricity that enters the battery.

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If each bond is 0.123 nm long, the far from the oxygen atom is the center of mass of the molecule  is 6.7 × 10⁻³ nm.

The mass of the hydrogen = 1 amu

The mass of the oxygen = 16 amu

The distance y = 0.123 cos = 0.06 nm

The distance 0.123 sin 53 = 0.08 nm

r₁ = 0.06i+0.08j ,r₂  = 0.06i−0.08j, r₃ ==0

r = ( m₁r₁ + m₂r₂ + m₃r₃) / m₁ + m₂ + m₃

r = ( 1 (0.06i+0.08j + 0.06i−0.08j ) / 1 × 2 + 16

r =  (6.7 × 10⁻³ i )nm

Thus , the distance from the oxygen atom is the center of mass of molecule (6.7 × 10⁻³ i )nm.

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Answer: In atomic theory and quantum mechanics, an atomic orbital is a mathematical function describing the location and wave-like behavior of an electron in an atom. This function can be used to calculate the probability of finding any electron of an atom in any specific region around the atom's nucleus

Explanation:

Answer: the way root cells reproduce to increase root length

Explanation:

Rudolf Ludwig Carl Virchowas known as the founder of social medicine and also the father of modern pathology.

Virchow posited that all cells are gotten from already existing cells and he used this in his work towards cellular pathology, as it was made clear that diseases takes place at the cellular level. He posited that the cells that are malfunctioning cause diseases.

Based on the above analysis, the image that Tumu would most likely use in his assignment to feature Rudolf Virchow is the way root cells reproduce to increase root length.

Answer:

the way root cells reproduce to increase root length

Explanation:

Answer:

a: palladium or Pd

b: arsenic or As

c: magnesium or Mg

d: radon or Rn

e: francium kr Fr

Explanation:

i looked at the periodic table haha

a. The element in group 10 and period 5 is palladium or Pd. b. The element in group 15 and period 4 is arsenic or As.  c. The element in group 2 and period 3 is magnesium or Mg. d. The element in group 18 and period 6 is  radon or Rn. e. The element in group 1 and period 7 is francium or Fr.

A chemical element is a species of atoms, including the pure substance made entirely of that species, that have a specific number of protons in their nuclei. Chemical elements, in contrast to chemical compounds, cannot be reduced by any chemical process into simpler molecules.

A substance is considered to be an element if it cannot be reduced to a less complex form. They can be identified by their particular atomic number. The periodic table groups the elements according to their atomic number and draws attention to those with related qualities.

Each element's atom contains a specific number of protons. For instance, a carbon atom has six protons compared to the one proton in a hydrogen atom. Ions are created by changing the number of electrons in an element's atom.

Thus,  The element in group 10 and period 5 is palladium or Pd.

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Answer:

Sodium

Formula : Na

Equivalent mass:23.0

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If the lab is cold at 15°C, the melting point of acetic acid will be lower than that temperature and we will find it as a solid. Acetic acid has a melting point of 16.6°C, which means that it will remain in a solid state at 15°C.

However, if we increase the temperature, the acetic acid will eventually melt and become a liquid. It's important to note that the melting point of a substance can vary depending on the conditions, such as pressure or purity. Therefore, it's essential to control the temperature and other factors when determining the melting point of a substance accurately.
If the lab is cold at 15°C, the melting point of acetic acid, which is around 16.6°C, will be higher than that temperature. As a result, you will find acetic acid in its solid form, known as a crystalline solid, under these conditions.

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The missing word is "one". All the elements in this group form ions with a positive "one" charge when they chemically react. "Lithium" is the most reactive element in this group. These elements are very reactive with "water".

What is Alkali Metals?

Alkali metals are a group of chemical elements in the periodic table consisting of lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr). They are called "alkali" because when they react with water, they form alkaline solutions. Alkali metals have only one electron in their outermost shell, which makes them highly reactive and easily lose this electron to form positively charged ions. They are soft, silvery-white metals that can easily be cut with a knife, have low melting and boiling points, and are good conductors of heat and electricity. Alkali metals are not found in their pure form in nature because they are so reactive, but rather occur as compounds in minerals. They are important in many industrial and biological applications, such as batteries, fertilizers, and human nutrition.

The statement is referring to the alkali metals, which are the elements in Group 1 of the periodic table. All elements in this group have one valence electron, which they readily give up in order to form positive ions (cations) with a charge of +1.

Among the alkali metals, Francium is the most reactive element due to its large size and the weak attraction between its valence electron and the nucleus.

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The correct option is C. ΔG°is less than 0 is known about the change in free energy.

Gibb's unfastened power is known as unfastened power due to the fact Gibb's energy is effortlessly available every time. If required the reaction can get this electricity without having to paint for it. The trade-in Gibb's unfastened power is the sum of enthalpy and the made of temperature and entropy of the gadget.

Gibbs's unfastened strength is denoted via the symbol 'G'. Its price is usually expressed in Joules or Kilojoules. Gibbs's loose energy can be defined because of the most quantity of work that can be extracted from a closed system. In line with the legal guidelines of thermodynamics, unfastened power is the energy it truly is available to be used at a given time. The legal guidelines of physics, consequently, imply that it's impossible for the quantity of to be had the energy to be countless.

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Complete Question:

At standard conditions, the equilibrium lies toward products for a given biochemical reaction. what is known about the change in free energy?

Choose one:

A.ΔG°equals 0.

B.ΔG°is greater than 0.

C.ΔG°is less than 0.

D.ΔG°is are unknown.

Answer:

In the first generation, the beetles changed to have light spots. The beetles with the light spotted trait had a better chance of survival causing the species evolved to have lighter spots.

Answer:

In the first generation, the beetles with the dark spotted trait had a better chance of survival. The trait mutated over time, causing the beetles with that trait to be darker.

Explanation:

In the picture that I had, it shows that some of the beetles in the first generation started to develop spots on their back or wings. It shows that later down the line, their backs start to get even more darker which means that is must be a trait that mutated over time that would allow the beetles with that trait to be significantly darker. They can't just change their traits if they want to so it would have to be something like mutation that caused it.

Answer:

A warm front

Explanation:

Answer: A warm front

Explanation: