What is the formula of the hydride formed by bromine and hydrogen?

Answer:

Explanation:

Just divide the mass of how much AgCl by the mass per mole to give you the number of moles, 573.28g 143.318gmol−1 AgCl = 4.00molAgCl

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Answer:

One may conclude that they have an identical number of electrons in their outermost shell, therefore the can be substituted for one another.

Explanation:

Elements in the same family tend to behave similarly in chemical reactions  because they have similar number of valence electrons in their outermost shell and they also have similar chemical properties.

Valence electrons are responsible for reactions between elements. The valence electron makes it possible for atoms to combine and react, therefore, elements in a family behave similarly in chemical reactions because they have an identical number of electrons in their outermost shell.

One of the goals of a Hazardous Material Identification System is to provide clear and standardized labeling and identification of hazardous materials.

This allows for quick recognition and understanding of the potential hazards associated with the materials. A Hazardous Material Identification System aims to ensure the safety of workers, emergency responders, and the general public by providing consistent and easily recognizable symbols, labels, and signs. These systems typically utilize color-coded labels, placards, and safety data sheets (SDS) to communicate important information about the hazardous materials, such as their chemical composition, handling precautions, and potential risks. By implementing a standardized identification system, it becomes easier to identify and appropriately respond to hazardous materials, mitigating the potential for accidents, injuries, and environmental damage.

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2.08x10^-3 moles Sucrose

6.69x10^-1 moles Aspartame

Take 1.25x10^21 then divide by Avogadro's number (6.02x10^23) and you're left with 0.00208 moles Sucrose. Then use your significant figures (3 in this case) and put it into scientific notation. 2.08x10^-3 moles.

Take the 197g of Aspartame, then divide by the molar mass of it (294.34g), and you're left with 0.669 moles. Use significant figures (3 again) and put into scientific notation, and you're left with 6.69x10^-1 moles.

Answer:

C stays The same.

Is the answer.

The molecular formula of the compound is (d) \(S_2O_6\).

The molar mass of a compound represents the mass of one mole of that compound. To determine the molecular formula, we need to find the ratio between the empirical formula and the molecular formula. The empirical formula gives the simplest whole-number ratio of atoms in a compound. In this case, the empirical formula is \(SO_2\), indicating that for every one sulfur atom, there are two oxygen atoms.

To find the molecular formula, we need to compare the molar mass of the empirical formula with the given molar mass of the compound. The molar mass of the empirical formula \(SO_2\) can be calculated by adding the atomic masses of sulfur (S) and oxygen (O):

Molar mass of \(SO_2\) = (32.07 g/mol for S) + (2 × 16.00 g/mol for O) = 64.07 g/mol.

Since the molar mass of the empirical formula matches the given molar mass of the compound, the empirical formula is also the molecular formula. Therefore, the molecular formula of the compound is \(S_2O_6\).

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Explanation:

The reaction between magnesium ribbon and dilute hydrochloric acid is a classic example of a single replacement reaction, which can be represented by the following chemical equation:

Mg (s) + 2HCl (aq) → MgCl2 (aq) + H2 (g)

In this reaction, magnesium (Mg) reacts with hydrochloric acid (HCl) to form magnesium chloride (MgCl2) and hydrogen gas (H2).

The rate of this reaction can be altered by changing the concentration of the hydrochloric acid. This is because the rate of a chemical reaction depends on the concentration of the reactants. Specifically, the rate of the reaction is proportional to the concentration of the reactants raised to some power, which is determined by the reaction's rate law.

In this reaction, the rate law can be expressed as:

Rate = k [Mg] [HCl]^x

Where k is the rate constant and x is the order of the reaction with respect to hydrochloric acid. The order of the reaction with respect to magnesium is one, since the concentration of magnesium does not change during the reaction.

When the concentration of hydrochloric acid is increased, the rate of the reaction increases because there are more hydrochloric acid molecules available to collide with magnesium atoms and react. This means that the value of x is greater than zero and the reaction is dependent on the concentration of hydrochloric acid.

Conversely, when the concentration of hydrochloric acid is decreased, the rate of the reaction decreases because there are fewer hydrochloric acid molecules available to react with magnesium. This means that the value of x is less than one and the reaction is not entirely dependent on the concentration of hydrochloric acid.

Answer: 10

Explanation:

"To compare two earthquakes in terms of shaking, you subtract one magnitude from the other and raise 10 to that power: 10^(M1-M2)." (from science.org).

So, comparing a magnitude 8 and 7 earthquake,

8-7=1.

the stronger earthquake shakes 10^1 or 10 times as hard as the milder one.

The frequency of a red laser that has a wavelength of 676 nm would be 4.43 x \(10^{14\) hertz.

The frequency and wavelength of a wave are related by the following equation:

λf = c

Where λ is the wavelength of the wave in meters, f is the frequency in Hertz, and c is the speed of light in a vacuum.

in this case, λ = 676 nm = 6.76 x \(10^{-7\) m

c = 299,792,458 m/s

Making f the subject of the formula:

f = c/λ

  = 299,792,458/6.76 x \(10^{-7\)

  = 4.43 x \(10^{14\) hertz

In other words, the frequency of a red laser that has a wavelength of 676 nm would be 4.43 x \(10^{14\) hertz.

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The standard cell potential for this constructed cell is 0.44 V.

To calculate the standard cell potential (E°cell) of this particular cell, we need to use the equation E°cell = E°cathode - E°anode.

In this case, the silver electrode (Ag) is the cathode and the copper electrode (Cu) is the anode. Therefore, E°cathode = E°Ag/Ag = 0.80 V and E°anode = E°\(\frac{Cu}{Cu_{2} }\)+ = 0.36 V.

Substituting these values into the equation, we get E°cell = 0.80 V - 0.36 V = 0.44 V.

Therefore, the standard cell potential for this constructed cell is 0.44 V.

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Answer:

2 atoms

Explanation:

Sodium Chloride or NaCl is made up of two elements, sodium (or Na) and chlorine (or Cl). A molecule of sodium chloride, NaCl, consists of one atom each of sodium and chlorine. Hence, each molecule of NaCl has 2 atoms total.

2原子。塩化ナトリウムまたはNaClは、ナトリウム（またはNa）と塩素（またはCl）の2つの元素で構成されています。

There are approximately 3.01 x 10²² atoms in 5 grams of NaCl.

To calculate the number of atoms, we first need to convert the mass of NaCl into moles. The molar mass of NaCl is 58.44 g/mol, which is the sum of the atomic masses of sodium (22.99 g/mol) and chlorine (35.45 g/mol).

Using the formula:

moles = mass / molar mass

we can calculate the number of moles of NaCl in 5 grams:

moles = 5 g / 58.44 g/mol ≈ 0.0857 mol

Next, we need to use Avogadro's number, which is approximately 6.022 x 10²³ atoms/mol, to convert moles into atoms.

Number of atoms = moles x Avogadro's number

Number of atoms = 0.0857 mol x 6.022 x 10²³ atoms/mol ≈ 5.16 x 10²² atoms

Therefore, there are approximately 3.01 x 10²² atoms in 5 grams of NaCl.

It's important to note that this calculation assumes that all the NaCl is fully dissociated into its constituent atoms, which may not be the case in all situations.

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Explanation:

Answer:

Assuming that the butter is already a liquid, it is a chemical change in which the milk solids of the butter oxidize.

Explanation:

I hope this helps :)

Chemical changes have occurred as the stick of butter melts as the milk solids present in butter undergo oxidation resulting in formation of new substances.

Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.

There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are three types of chemical changes:

1) inorganic changes

2)organic changes

3) biochemical changes

During chemical changes atoms are rearranged and changes are accompanied by an energy change as new substances are formed.

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Answer:

10 electrons

Explanation:

Neon 21 has 10 protons and 11 neutrons. We know that there are the same number of electrons as there are protons. so your answer is 10.

Answer: Burning fuels?

Explanation: I’m not very sure actually

Answer:

You will notice that there is excess heat in the car.

Explanation:

The excess heat in the car is as a result of the radiation of the sun's waves which is then conducted by the car, which makes inside of the car hot.

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Answer

It start felling hot inside

Explanation:

The heat is entering and staying in the car making it a excess of heat

Answer:

The protons determine the name of an element and also atomic number because its the same as protons.

Explanation:

To calculate the amount of water needed to dilute the solution of potassium hydroxide and change its pH from 12.0 to 11.0, we need to use the formula for calculating the pH of a diluted solution.

The formula is:

pH = -log[H+]

where [H+] is the concentration of hydrogen ions in moles per liter.

Since we are diluting the solution by adding water, the concentration of [OH-] (hydroxide ions) will decrease proportionally to the volume of water added. This means that we can use the following equation to calculate the new concentration of [OH-]:

[OH-]1V1 = [OH-]2V2

where V1 is the initial volume of the solution, [OH-]1 is the initial concentration of hydroxide ions, V2 is the final volume of the solution after dilution, and [OH-]2 is the final concentration of hydroxide ions.

We know that the initial pH is 12.0, which means that [OH-]1 = 10^-2.0 M = 0.01 M.

We want to change the pH to 11.0, which means that [OH-]2 = 10^-11.0 M = 1 x 10^-11 M.

We also know that we are adding water to dilute the solution, but we don't know how much water we need to add yet. Let's call this volume of water "Vw".

Using the equation above, we can solve for V2:

[OH-]1V1 = [OH-]2V2

(0.01 M)(100 ml) = (1 x 10^-11 M)(100 ml + Vw)

V2 = (0.01 M)(100 ml)/(1 x 10^-11 M) - Vw

V2 = 10^12 ml - Vw

Now we can use this value for V2 in the pH formula to calculate the new pH:

pH = -log([H+])

[H+] = Kw/[OH-]

Kw is the ion product constant for water, which is equal to 1 x 10^-14 at room temperature.

[H+] = (1 x 10^-14)/(1 x 10^-11)

[H+] = 1 x 10^-3 M

pH = -log(1 x 10^-3)

pH = 3

We want to achieve a pH of 11.0, so we need to add enough water to bring down the pH from 12.0 to 11.0. This means that we need to add enough water so that V2 becomes:

V2 = (0.01 M)(100 ml)/(1 x 10^-11 M) - Vw = 10^11 ml

Therefore, we need to add:

Vw = V2 - initial volume of solution

Vw = (10^11 ml) - (100 ml)

Vw = 99999900 ml or approximately 100 million ml or 100 cubic meters of water.

So, in order to change the pH of a solution of potassium hydroxide with a pH of 12.0 to a pH of 11.0 by adding water only, you would need to add approximately 100 million milliliters or about 100 cubic meters of water.

The given reaction is a double replacement reaction; option B.

A chemical reaction is a reaction in which chemical changes occurs in the atoms of reactants which results in the formation pf products.

The given reaction is as follows:

Since exchange of ions occur, it is a double replacement reaction.

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The isotope is a neutral atom as the number of electrons and protons are equal in an isotopic atom.

Isotopes can be described as atoms of an element that exhibit the same atomic number but a different atomic mass. Isotopes of an element exhibit an equal number of electrons and protons Therefore, they are not charged atoms. The numbers of neutrons in their respective nucleus of an isotope of an element is different.

In the isotopes of oxygen element, the number of neutrons in oxygen increases by 1, and it creates the isotope of oxygen. The number of electrons or protons in each isotope of oxygen element are eight therefore, all the isotope are neutral.

Therefore, the isotopes of an element are not charged atoms.

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Answer herbert

Explanation:

cause he did not do any of the safety precautions and he was prob not listening to the teacher  

Answer:

The mole and atonmicity of both the gases are different, the number of atoms is not same.

Explanation:

The number of atoms in a molecule (compound) depends on mole number and atomicity.

↬ Mole of 100 g H₂ = 100g ÷ 2u = 50 mole

∴Number of atoms in 100 g H₂

= 2 x 50 x 6.022 × 10²³

= 6.022 x 10²⁴ atoms

↬ Mole of 100 g He = 100g ÷ 4u = 25 mole

∴ Number of atoms in 100 g He

= 1 × 25 × 6.022 × 10²³

= 150.55 × 10²³

= 1.5055 x 10²⁵ atoms

Thus, The mole and atonmicity of both the gases are different, the number of atoms is not same.

-TheUnknownScientist 72

The mass of the substance is calculated by subtracting the empty graduated cylinder's mass from the mass of the cylinder with the substance: 15.08 g - 12.55 g = 2.53 g.

We subtract the empty graduated cylinder's mass from the substance's mass to find its mass. The empty cylinder weighs 12.55 g, whereas the filled one weighs 15.08 g. 2.53 g separates them.

The graded cylinder's substance added 2.53 g. This calculation assumes the graduated cylinder does not affect measured mass.

The substance's mass (2.53 g) is calculated by subtracting the initial (12.55 g) from the final (15.08 g). This method uses the mass difference before and after adding a substance to a container to measure its mass.

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The cylinder that contains gas closest to absolute zero temperature is cylinder D.

The correct option is cylinder D, 0. 0005 m/s.

Gas is one of the four states of matter. Gas is made up of individual atoms. The molecules of gas are very far from each other.

There are many gases present in the atmosphere.

The speed of gas depends on the temperature of the cylinder. The lower the temperature, the slower the speed of the molecule of gas.

Thus, cylinder D (0. 0005 m/s) has the slowest speed, which is related to low temperature absolute zero.

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Answer:

The U.S.S.R

Explanation:

Mir, Soviet/Russian modular space station, the core module (base block) of which was launched into Earth orbit by the U.S.S.R. in 1986

Answer:

The Soviet Union, now known as Russia.

Explanation:

Answer:

Thermal energy in the form of heat moved from the fire to the skewer and marshmallow.

Explanation:

He holds a marshmallow on a metal skewer over a fire. A few seconds late, the marshmallow is cooked and the skewer feels warm.

The heat generated from the marshmallow flowed in the form of thermal energy to the skewer and fire.

The term thermal energy refers to a form of energy that exists as a result of the temperature difference between two bodies. Thermal energy will always flow from the hotter to the cooler body.

Hence, the marshmallow is cooked and the skewer feels warm shortly after because the heat generated from the marshmallow flowed in the form of thermal energy to the skewer and fire.

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When you compare the results of the grease spot test for potato chips, white candle wax, vegetable oil and rubbing alcohol, you will find that all of these substances can be used to remove grease stains from clothes. However, there are some differences in their effectiveness and ease of use.

Potato chips are often used as a quick fix for small grease stains on clothing. You simply place a chip on the stain and press down firmly. The grease from the chip absorbs the grease from the stain, leaving the fabric clean. However, this method is not always effective and may leave a residue on the fabric.

White candle wax can be used to remove grease stains from clothes by melting the wax onto the stain and then peeling it off once it has hardened. This method is effective, but can be time-consuming and messy.

Vegetable oil can be applied to grease stains and left to sit for a few minutes before washing. It is effective at removing the stain, but can be difficult to remove from the fabric.

Rubbing alcohol is a common household cleaner that can be used to remove grease stains. It can be applied directly to the stain and rubbed with a clean cloth. It is effective and easy to use. However, it should be used with caution on delicate fabrics as it can cause damage.

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Water molecules are created when one oxygen molecule joins with two hydrogen molecules. Water molecules are created when one oxygen molecule joins with two hydrogen molecules.

Two hydrogen molecules (H) and one oxygen molecule (O) split throughout the reaction. These atoms combine in this specific manner to form two water molecules, H20. To illustrate what happens in this reaction, create a particle diagram. The atoms need energy to react in order to break their bonds and create a new substance. Each hydrogen atom has a positive charge of one after the bonds are broken, but each oxygen atom has a negative charge of two. Water is produced when two hydrogen atoms join with one oxygen atom. No electrical charge exists in water.

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