a balanced equation representing a chemical reaction can be written using

Answer:

B) The Metal A ion is reduced and Metal B is oxidized.

Explanation:

When we think of electroplating, we often think of a set up in which there is a nonsponteanous reaction driven by the presence of a cell.

However, in displacement plating, a cell is not involved. Metals are chosen based on their respective position in the electrochemical series.

For instance, silver can be coated on copper by immersing the copper rod into a silver ion solution. The copper rod becomes oxidized. The silver ions accept electrons and become deposited on the copper rod.

Answer:

The answer is B.

Explanation:

h | h

H| Hh | Hh

h| hh | hh

12.308% of the chemical is sulfur. The compound's whole sulfur content is transformed into barium sulfate. Therefore, the mass for sulfur from barium sulfate will match the mass for sulfur in the compound.

People are not highly poisonous to sulfur. However, consuming far to much sulfur may result in diarrhea or a burning feeling. Sulfur dust inhalation might irritate the airway or make one cough. The eyes and skin may also become irritated by it.

Sulfur can indeed be found in sulfide ores and in nature. It is native to areas close to volcanoes and hot springs. The tenth most common element, sulfur, is found in almost all types of plant and animal life, meteorites, ocean ocean, the humankind's crust, and or the atmosphere.

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Answer:

Brainliest pls

Explanation:

Although the information for the trial was not given, we can offer a summed-up reply in that while playing out an analysis to accomplish outright zero temperatures, the worth won't ever match the specific worth.

What is absolute zero?

Absolute zero is the lower furthest reaches of temperature. Considered the coldest conceivable temperature that can exist. Nonetheless, any endeavor to arrive at this temperature in a controlled climate has fizzled, researchers don't think reproducing this temperature is conceivable.

In this way, we can affirm that the worth of indisputably the zero tests didn't match the acknowledged worth. Assuming the speculation was that it would be troublesome or difficult to accomplish, then the information would uphold the theory, if not, it would neglect to do as such.

In outline, outright zero is a temperature that can't be reproduced in a lab, so the worth in this analysis doesn't match the acknowledged worth and there could be no further investigation to be done on this.

N₂ : limiting reactant

H₂ : excess reactant

Given

mass of N₂ = 100 g

mass of H₂ = 100 g

Required

Limiting reactant

Excess reactant

Solution

Reaction

N₂+3H₂⇒2NH₃

mol N₂(MW=28 g/mol) :

\(\tt mol=\dfrac{mass}{MW}=\dfrac{100}{28}=3.571\)

mol H₂(MW= 2 g/mol) :

\(\tt mol=\dfrac{100}{2}=50\)

A method that can be used to find limiting reactants is to divide the number of moles of known substances by their respective coefficients, and small or exhausted reactans become a limiting reactants

From the equation, mol ratio N₂ : H₂ = 1 : 3, so :

\(\tt \dfrac{3.571}{1}\div \dfrac{50}{3}=3.571\div 16.6\)

N₂ becomes a limiting reactant (smaller ratio) and H₂ is the excess reactant

Answer:

When you combine the solid (baking soda) and the liquid (vinegar), the chemical reaction creates a gas called carbon dioxide. Carbon dioxide is invisible, except as the bubbles of gas you may have noticed when the vinegar and baking soda mixture began to fizz.

Explanation:

The product at the negative electrode is not always a metal because it will only be produced if it is less reactive than hydrogen.

These are materials which donate electrons in a chemical reaction and have high heat and electrical conductivity.

Metals are more reactive than hydrogen which is why it is not always produced at the cathode.

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On completing and balancing the half-reaction of chromium (iii) forming from dichromate the number of electrons are either produced or consumed  are option (b): Three electrons are produced.

To determine the number of electrons produced or consumed in the half-reaction of chromium(III) forming from dichromate, let's first write the balanced half-reaction. The dichromate ion (Cr2O7^2-) is reduced to chromium(III) ion (Cr^3+) in this reaction. We can represent the reduction half-reaction as follows:

Cr2O7^2- ⟶ Cr^3+

To balance the half-reaction, we need to equalize the number of chromium atoms and oxygen atoms on both sides. Since there are two chromium atoms on the left side and only one on the right side, we add a coefficient of 2 in front of the chromium ion:

2Cr2O7^2- ⟶ 2Cr^3+

Now, let's examine the changes in oxidation state for chromium in this reaction. In dichromate (Cr2O7^2-), chromium has an oxidation state of +6, while in chromium(III) (Cr^3+), it has an oxidation state of +3. Therefore, the oxidation state of chromium decreases by 3 in this reduction half-reaction.

Reduction involves a gain of electrons. Since the oxidation state of chromium decreases by 3, it means that three electrons are gained by each chromium ion. Therefore, the correct answer is option (b): Three electrons are produced.

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Answer:

c. Six electrons are consumed

Explanation:

The first step is to ensure that the chromium atoms are balanced by adjusting the coefficients if needed. Do so by giving the Cr3+ ion a coefficient of 2.

Cr2O2−7 ⟶ 2Cr3+ (aq)

Next, balance the oxygen atoms by adding H2O molecules. The half-reaction has seven O atoms on the left and none on the right, so add 7H2O (l) to the right side.

Cr2O2−7 ⟶ 2Cr3+ (aq) + 7H2O (l)

Next, balance the hydrogen atoms by adding H+ ions. The half-reaction has 14 H atoms on the right side and none on the left, so add 14H+(aq) to the left side.

Cr2O2−7 + 14H+ (aq) ⟶ 2Cr3+ (aq) + 7H2O (l)

At this point, the charge can be balanced by adding electrons (e−). To do so, find the total charge on each side of the reaction. The left side has a total charge of (−2) + 14 × (+1) = 12+. The right side has a total charge of 2 × (+3) = 6+. Adding 6e− to the left side brings the charge down to 6+ to match the right side.

Cr2O2−7 + 14H+ (aq) +6e− ⟶ 2Cr3+ (aq) + 7H2O (l)

This gives us the answer to the question, which is that six electrons are consumed, since they are on the left side of the equation. Note that it does not make a difference whether the reaction is assumed to be in an acidic or a basic solution. The extra step taken for a basic solution is to add the same number of OH− ions to both sides of the reaction, which does not affect the number of electrons needed to balance the charges.

The best precursor to the target molecule is benzyl alcohol, as it provides the necessary carbon skeleton for the synthesis of acetophenone.

Acetophenone is an organic compound with the chemical formula C8H8O. It belongs to the class of compounds known as aromatic ketones and is a colorless, oily liquid with an aroma resembling that of roses. Acetophenone is naturally present in many fruits and plants, including raspberry, blackberry, honey, and apple. It is commonly used as a flavoring agent and fragrance ingredient in cosmetics, food, and beverages. It is also used in the pharmaceutical industry as an intermediate in the synthesis of drugs.

Benzyl alcohol can be converted to an alkyl halide by reaction with thionyl chloride, which can then be reacted with methanol to form the desired product.

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The length of the wire is approximately 53.9 feet.

To find the length of the wire, we can use the trigonometric relationship of the angle of elevation.

Given:

Height of the pole (vertical side) = 45 feet

Angle of elevation (opposite side) = 39º

We can use the trigonometric function tangent (tan) to relate the height of the pole and the length of the wire.

Tangent of the angle of elevation (tanθ) = Height of the pole / Length of the wire

tan(39º) = 45 / Length of the wire

Rearranging the equation to solve for the length of the wire:

Length of the wire = Height of the pole / tan(39º)

Substituting the values:

Length of the wire = 45 / tan(39º)

Calculating this using a calculator or trigonometric table, we find:

Length of the wire ≈ 53.9 feet

Therefore, the length of the wire is approximately 53.9 feet when rounded to the nearest tenth.

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Explanation:

When a virus infects a bacterial cell, often new viruses are assembled and released when the host bacterial cell is lysed. If these new viruses go on to infect new bacterial cells, the new host cells may not be lysed. What is the most plausible explanation for this?A) The bacterial cell must be resistant to infection by the virus.

B) The virus carries genes that confer resistance to the host bacterial cell.

C) The host bacterium couples the viral infection with transformation.

B) The virus carries genes that confer resistance to the host bacterial cell.

C) The host bacterium couples the viral infection with transformation.

Answer:

LCD TV's use a CCFL for backlighting

Answer:

The density of the metal alloy is 7,496.25 kg/m^3 (rounded to 7,496 kg/m^3).

Explanation:

The given information from the exercise is:

- Metal alloy mass (m): 100kg

- Mass of metal A (mA): 60kg

- Mass of metal B (mB): 40kg

- Density of metal A (dA): 9,000 kg/m^3

- Density of metal B (dB): 6,000 Kg/m^3

1st) With the values of mass and density of each metal, we have to calculate the volume of each metal:

• Volume metal A:

• Volume metal B:

The volume of metal A and metal B is 6.67x10^-3 m^3. So, we have to add them to obtain the total volume of the metal alloy:

2nd) Now we can calculate the metal alloy density, replacing the values of Volume (V) and the metal alloy mass (100kg) in the density formula:

So, the density of the metal alloy is 7,496.25 kg/m^3 (rounded to 7,496 kg/m^3).

Answer:

According to the study, urban heat islands, created from pavement and buildings in big coastal cities like Houston, cause warm air to rise and interact with sea breezes to create heavier and more frequent rainfall in and downwind of the cities.  

1) Groups of elements in the periodic table.

On the left, there are several types of metals and on the right, there are nonmetals, halogens, and noble gases.

There is a group that is between those mentioned above, the semi-metals also known as Metalloids.

.

Weapons of mass destruction that utilize chlorine gas fall under the category of chemical hazards or chemical weapons.

Weapons of mass destruction (WMD) are highly destructive devices designed to cause significant harm and casualties on a large scale. Chlorine gas, when used as a chemical weapon, falls under the category of chemical hazards.

Chemical hazards refer to substances that can cause harm or pose risks to human health and the environment due to their chemical properties.

Chlorine gas is a toxic and corrosive substance that, when released in large quantities, can have severe detrimental effects on human respiratory systems and other organs. It can cause respiratory distress, lung damage, and even death.

The use of chlorine gas as a weapon is prohibited under international agreements, such as the Chemical Weapons Convention, due to its destructive and inhumane nature.

It is important to note that weapons of mass destruction encompass various types, including chemical, biological, radiological, and nuclear weapons, each with its specific hazards and risks.

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The presence of the ions in the HCl would make the solution to conduct electricity.

Because it separates into ions (H+ and Cl-) when hydrochloric acid is dissolved in water, HCl (hydrochloric acid) solution conducts electricity. The electric charge of the H+ and Cl- ions allows them to travel and convey current across the solution.

The dissociation constant (Ka) of HCl describes how much of the compound separates into ions depending on the concentration of the solution. A higher HCl concentration will produce more ions, which will increase conductivity.

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Answer:

water

for one molecule of water each atom has the atomic mass unit, u,shown.

Explanation:

*can i be the brainliest*

Answer:

Density of liquid  = 1.08 g/mL

Explanation:

Given data:

Density of liquid = ?

Mass of liquid = 18.2 g

Volume of liquid = 16.9 mL

Solution:

Density is equal to the mass of object divided by its volume.

d = m/v

Now we will put the values in formula.

d = 18.2 g/16.9 mL

d = 1.08 g/mL

Answer:

4Al + 3O2 → 2Al2O3

Explanation:

Answer:

1. Butter is yellow

2. Melts at 32-35 degrees celsius

3. Butter usually comes in a square shape (I'm not so sure about this)

4. Butter is squishy

Explanation:  Butter remains a firm solid when refrigerated, but softens to a spreadable consistency at room temperature, and melts to a thin liquid consistency at 32 to 35 °C (90 to 95 °F). The density of butter is 911 g/L (151⁄4 oz/US pt). It generally has a pale yellow color, but varies from deep yellow to nearly white.

The answer is B hydro sphere

The density of the substance is 0.77 g/cm³.

The density of a substance is calculated by dividing its mass by its volume. In this case, the mass of the substance is 85g and the volume is 110cm³.

Density = Mass / Volume

Density = 85g / 110cm³

To obtain the answer, we divide 85g by 110cm³.

Calculating the division, we find that the density of the substance is approximately 0.77 g/cm³.

Therefore, the density of the substance is 0.77 g/cm³.

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Density =mass/volume

=6/3

=2

Size-exclusion chromatography (SEC) is a suitable chromatographic method for isolating pure a and b chains.

SEC is a technique that separates molecules based on their size. In this case, the a and b chains can be separated from other components based on their molecular weight. SEC columns have porous beads that allow smaller molecules to enter and travel through the beads, while larger molecules are excluded and elute first. By choosing an appropriate SEC column, the a and b chains, which typically have different molecular weights than other components, can be isolated and collected separately. This method ensures the purity of the isolated a and b chains.

Size-exclusion chromatography (SEC) is a useful chromatographic method for isolating pure a and b chains. The technique separates molecules based on their size, and by utilizing a suitable SEC column, the a and b chains can be separated from other components due to their distinct molecular weights. This approach guarantees the purity of the isolated a and b chains, making it an effective method for their isolation.

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Answer:

25

E

12

Explanation:

As shown in the pic

Mass number = 12 + 13 = 25

Atomic number = No of protons = 12

The mass of H₂O in the oceans is only about 0.02% of the mass of the Earth.

Given that seawater has a density of 1.025 gm/cm³ and that seawater is 96.5% H₂O. We want to calculate the mass of H₂O in the oceans. To calculate this, we first need to calculate the mass of seawater present in the oceans.

The mass of seawater present in the oceans is calculated as follows:Mass of seawater = volume of seawater × density of seawater Volume of the ocean is approximately 1.3 billion km³.Therefore, mass of seawater = volume of seawater × density of seawater= 1.3 × 10⁹ km³ × 1 × 10³ m³/km³ × 1.025 × 10³ kg/m³= 1.33 × 10²¹ kgNext, we want to find the mass of H₂O in the oceans.

To calculate this, we need to find 96.5% of the mass of seawater present in the oceans.

Therefore, the mass of H₂O in the oceans is:Mass of H₂O = 96.5% × mass of seawater= 96.5/100 × 1.33 × 10²¹= 1.28 × 10²¹ gTherefore, the mass of H₂O in the oceans is 1.28 × 10²¹ g.Finally, let us compare the mass of H₂O in the oceans to the total mass of the Earth. The mass of the Earth is approximately 5.97 × 10²⁴ kg, which is equal to 5.97 × 10²⁷ g. Therefore, the mass of H₂O in the oceans is only about 0.02% of the mass of the Earth.

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