A large bar of solid gold is melted into liquid. the liquid is then poured into molds to make a number of gold coins. was this chemical or physical? explain.

When a magnesium atom becomes a cation, the size of the radius decreases because it lost electrons (Option A)

Magnesium is a divalent metal. It loses its valence electrons to form a stable octet electronic configuration.

Generally, the ions (or cations) of metals tends to be smaller than their atoms because they lose electrons to form ions.

Now, we shall consider the atom and the ion of magnesium to see the difference. Please see attached photo

Magnesium lose electrons to form ion (cations) as follow:

Mg -> Mg²⁺ + 2e

From the equation and the diagram, we can see that the ion of magnesium is smaller than its atom.

This is so because the magnesium atom has two electrons more than the magnesium ion.

Thus, we can say that the correct option is: decreases because it lost electrons (Option A)

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Always wear chemical splash goggles, chemical-resistant gloves and a chemical-resistant apron whenever using concentrated acids or acid solutions. Purchase dilute acids whenever possible Acid handling requires the use of latex gloves. Solvent and chemicals in miscellaneous category require the use of polythene gloves. Check the gloves for any pin-holes prior to use. Wash your hands before eating, even if gloves were used while handling the chemical.  

i know it'sis a lot and it's a little messed up but can you handle it if you can and if it's right you mind giving me a brainliest?

Always wear chemical splash goggles, chemical-resistant gloves and a chemical-resistant apron whenever using concentrated acids or acid solutions

The release of O₂( oxygen gas) from the process of photosynthesis is made disks to be able to float.

Photosynthesis can be described as the process in which green plants manufacture their food in the presence of sunlight which is trapped by the chlorophyll of the leaves. They are also called primary producers and they use compounds such as water and carbon dioxide.

The spinach leaf disks intake carbon dioxide from a sodium bicarbonate solution and sink to the bottom of a beaker. When the beaker is exposed to light, the disks use carbon dioxide gas and water to produce oxygen gas and glucose. Oxygen gas released from the leaves due to photosynthesis forms tiny bubbles that make the leaves float.

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In other to increase the electric force between two charged particles by a factor of 16, the charged particle is increased by 16.

This is referred to as the repulsive or attractive interaction between any two charged bodies and we should note that like poles repel and unlike poles attract.

One of the charged particle has to be increased by 16 for there to be an increase in the electric force between the particles by a factor of 16 and it can seen below:

F1/ F2 = kq1q2/r² / 16kq1q2 / r² where f is force, q is the charge and r is distance between charges.

F1 / F2 = 1/16

F2 = 16F1

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The reactivity of a substance with oxygen is a chemical, not a physical property. The reason it is called a chemical property is that it relies on its electron configuration to determine how it behaves around other substances.

A chemical property is a property of any material that becomes apparent during or after a chemical reaction; that is, any quality that can only be determined by changing the chemical properties of a substance.

Oxygen is a very reactive element, is highly paramagnetic and readily combines with other elements. One of the most important chemical properties of oxygen is that it promotes combustion. Even at room temperature, oxygen binds to elements and forms e.g. rust.

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Answer:

q2

Explanation:

Both the reactants are gases at STP.

Equation:

2H2S + 302 → 2SO2 + 2H2O

As per this equation 2 moles (2 x 22.4 L) of H2S

need 3 moles (3 x 22.4 L) of oxygen for their

complete oxidation.

So, volume of oxygen needed for 2.8 L of H2S =

(2.8 x 3 x 22.4)/(2 x 22.4) = 4.2 L (answer)

(a) H₂O(g) represents water in the gaseous state. It is produced as a product of the reaction between hydrogen sulfide (H₂S) and oxygen (O₂).

Gaseous state refers to a substance existing as a gas. When a substance is in the gaseous state, its particles are not closely packed together like in a solid or liquid state. Instead, they are spread out and move freely, filling the available space.

(b) To calculate the volume of oxygen required to react with 50 cm³ of hydrogen sulfide, we need to use the stoichiometry of the reaction. From the balanced equation, we can see that the molar ratio between hydrogen sulfide (H₂S) and oxygen (O₂) is 2:3.

Given: Volume of hydrogen sulfide (H₂S) = 50 cm³

Using the molar ratio, we can set up the following proportion: 2 mol H₂S / 3 mol O₂ = 50 cm³ H₂S / x cm³ O₂

To find the volume of oxygen, we can solve for x:

x = (50 cm³ H₂S * 3 mol O₂) / 2 mol H₂S

Now, we need to convert the obtained moles of oxygen to volume using the ideal gas law. Since the volume is given in cm³, we can assume that the temperature and pressure are constant at standard conditions (typically 0°C and 1 atm).

Using the ideal gas law equation: PV = nRT

Assuming constant temperature and pressure, we can rearrange the equation as: V = (n * R * T) / P

Substituting the values: V = (moles of O₂ * 22.4 L/mol) / (1 atm)

Calculate the moles of O₂ using the obtained value from the proportion.

Finally, convert the volume from liters to cm³ by multiplying by 1000.

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Answer:

I think it's carry energy, but I'm not sure

An increase in the surface area of the solid will increase the rate of the reaction.

The reaction rate will be influenced by the solid's surface area if one of the reactants is solid. This is due to the fact that the two kinds of molecules can only collide at the liquid-solid interface, also known as on the surface of the solid. The reaction rate will rise due to a more significant interaction of the surface areas between the two molecules when the solid is pulverized into a gas. If a reactant has a larger surface area: The other reactant is exposed to more particles. Particles are more likely to collide, which results in more successful collisions per second this will influence the reaction speed to increase.

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Acid - base pairs.

Arrhenius theory, says, that acids are substances that dissociate in water to yield electrically charged atoms or molecules, called ions, one of which is a hydrogen ion (H+), and that bases ionize in water to yield hydroxide ions (OH−).

It is now known that the hydrogen ion cannot exist alone in water solution; rather, it exists in a combined state with a water molecule, as the hydronium ion (H3O+). In practice the hydronium ion is still customarily referred to as the hydrogen ion.

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a) HClO3 + H2O <=> H3O + + ClO3-

HClO3 is the acid, ClO3- is the base (acid-base pair)

H2O acepts that H+ from the HClO3, and becomes H3O+

H2O is a base, H3O+ is the acid (acid-base pair)

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b) HSeO4 - + NH3 <=> NH4 + + SeO4 2-

Here HSeO4 - can free one H so it would be the acid, and SeO4 2- is the base.

NH3 receives H+ from acid, so it is the base, and NH4+ is the acid.

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c) HCO3- + OH - <=> CO3 2- + H2O

HCO3- gives away one H, so it is the acid, and CO3 2- is the base

(HCO3-,CO3 2-) acid-base pair.

OH- receives the H+ and becomes H2O. OH- is the base and H2O acid.

H2O can be acid and base, remember that. In this case it is the acid.

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d) C5H5NH + + H2O <=> C5H5N- + H3O+

C5H5NH has the H, but on the right it doesn't, so it would be th acid. C5H5N- is the base.

H2O here is a base, because it receives the H+, and becomes H3O+ (the acid).

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The student used an acid-base extraction method to isolate three compounds. In this lab, students will use solvents of different polarity (mobile phases) to determine the optimal separation of the pigments found in spinach extracts.

Mixtures are physical mixtures or additional materials that retain their inherent properties and come together in the form of a reaction, suspension, or colloid. Combinations are materials made from materials or other uniquely styled materials. It can be separated using physical methods. Examples include solutions of salt and water, mixtures of sugar and water, various gases, and air.

The mixture consists of one or more pure materials with different compositions. There are heterogeneous and homogeneous types of mixtures. Dissimilar combinations have visually distinguishable additives, while homogeneous combinations appear uniform throughout. Agglomerates are created by the mixing of two or more distinct substances in the body and can be separated from below into their original substances. A chemical reaction occurs when additional substances combine to form a completely new substance and cannot be separated back into the original substance.

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Hybridization of atomic orbitals produces orbital shapes and spatial orientations that correlate to those predicted in VSEPR theory is how they are reconciled and is denoted as option D.

This is a term in chemistry which refers to the process in which atomic orbitals mix to form a new atomic orbital. The orbital usually has a different shape and a similar energy during the mixing process.

It helps us to reconcile valence bond theory with vsepr theory by producing orbital shapes and spatial orientations that correlate to those predicted in VSEPR theory hence why option D was chosen.

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Answer:Dmitri Mendeleev

Explanation:

The mass of water required to change the temperature of water from 25.0°C to 35.0°C when 4,000 joules of energy are released is 95.6g.

The mass of a substance in a calorimetry procedure can be calculated by using the following formula:

Q = mc∆T

Where;

According to this question, a sample of water is changed from 25.0°C to 35.0°C when 4,000 joules of energy are released. The mass of the water sample is as follows:

4000 = m × 4.184 × 10

4000 = 41.84m

m = 95.6g

Therefore, 95.6 grams is the mass of the water sample.

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Activation polarization is occuring due to the evolution or deposition of some gases taking place in a redox reaction. Concentration polarization occurs between two electrodes when uneven distribution of ions occurs in the boundary.

Polarization is the process of charge separation between two species or the potential difference occurred due to the concentration gradient.

The two types of polarization occuring are activation polarization and concentration polarization. In activation polarization there occurs difference by the accumulation of gases.

For example the evolution of gases from the hydrogen electrode immersed in an electrolyte causes a polarization between the two electrodes.

In concentration polarization, there will be a concentration gradient of ions in the boundary of two electrodes occured due the electroanalytical reaction.

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Answer: type the compound into your search bar then it should tell you what it is for 3. you should look up "what is the formula for -----" same thing for #4

Explanation:

Answer:

2.a.  germanium tetrahydride

2.b. dinitrogen tetrabromide

2.c. diphosphorus pentasulfide

2.d. selenium dioxide

2.e. nitrogen trihydride

2.f. silicon dioxide

3.a. PO3

3.b. SiCl4

3.c. N2O5

3.e. N2O4

3.f. CO

4.a CO2

4.b. SF6

4.c. N2Cl4

4.d. CI4

4.e. PF5

4.f. P2O5

****All numbers are subscripts, please do not write them as is, but to the bottom right of them like shown in the options from question 2.

Explanation:

To name covalent compounds (NM+NM), we use prefixes.

To name covalent compounds goes as follows:

First, name the first element in the formula the normal name it has (ex. Nitrogen, Oxygen). If the first element is present more than once shown by a subscript, use a prefix that will indicate how many there are present (ex. mono, di, tri).

Next, name the second element in the compound using prefixes aswell if present more than once. These elements though, will end with -ide instead of their original name (ex. monoxide, dibromide, trichloride).

Answer:

There are 2.2 moles of hydrogen.

Explanation:

The given information from the exercise is:

- Volume (V): 48.6L

- Temperature (T): 0°C (273K)

- Pressure (P): 1atm

1st) It is important to convert the temperature unit from °C to Kelvin:

This first step is very important, because all the units must be at atm, L and Kelvin, before using the Ideal Gases Law formula.

2nd) Now to calculate the moles of hydrogen, we hae to replace the values of V, T and P in the Ideal Gases Law formula:

R: is the gases constant, in its value is 0.082atm.L/mol.K.

So, there are 2.2 moles of hydrogen.

The cell obtain more magnesium through Active transport.

Active transportation uses include:

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During cellular respiration, oxygen and glucose are converted into water and carbon dioxide. The procedure produces ATP, which is converted into energy, carbon dioxide, water, and other byproducts.

Oxygen might be either present or absent while organisms are respiring. However, the activity is essentially known as "cellular respiration" so because cell seems to "respire" by consuming molecular oxygen (as an electron acceptor) and exhaling carbon dioxide (as an end product).

The process by which glucose is broken down in the presence of oxygen in the mitochondria of animals (animals and plants) to release energy in the form of ATP is referred to as cellular respiration.

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The type of conservation effort which involves the captive breeding program to increase the population numbers of Ferrets is  resource conservation and is denoted as option A.

This is referred to as the process in which valuable resources which are present on earth such as plants, minerals etc are protected through various means by the appropriate authorities or individual.

Conservation helps to prevent dying out and extinction of species which is denoted in the captive breeding program to increase the population numbers of Ferrets so as to prevent the extinction of the animal hence option A was chosen.

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A sample of gas occupies a volume of 70.3 ml as it expands, it does 140.6 j of work on its surroundings at a constant pressure of 783 torr and the final volume of the gas is 11.12L

A gas is a sample of matter that conforms to the shape of a container in which it is held and acquires a uniform density inside the container and even in the presence of gravity and regardless of the amount of substance in the container

Here given data is 11.12L

V₁ = Initial volume = 70.3 ml = 0.0703ml =  (1L=1000ml)

w = 140.6 J = 1.387 J = (1Latm=101.3J)

Pressure =  783 torr = 1.03 atm  = (1atm=760 torr)

V₂ = final volume = ?

1.387Latm = 1.03 atm × (V₂ - 0.0703ml)

(V₂ - 0.0703ml) = 11.05

V₂ = 11.12L

The final volume of the gas is 11.12L

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By calculating the response factor for the internal standard first, we can calculate that the concentration of the unknown analyte sample is 2.64 ppm.

When solving problems like this, we need to calculate the appropriate response factor:

A(X) / C(X) = F * A(S) / C(S)

A(X) - response for the analyte (3.47)

C(X) - concentration of the analyte (1 ppm)

F - response factor

A(S) - response for the internal standard (5.23)

C(S) - concentration of the internal standard (1 ppm)

F = A(X) * C(S) / (C(X) * A(S)

F = 3.47 * 1 ppm / (5.23 * 1 ppm)

F = 0.663

Now we can use this in the second calculation to obtain the concentration of the analyte in the sample. One thing to note is that in second measurement 1 mL of a 5.00 ppm internal standard was diluted to 10 mL, so the concentration of the internal standard is actually 5.00 ppm / 10 = 0.500 ppm.

4.26 / C(X) = 0.663 * 2.43 / 0.500 ppm

C(X) = 4.26 * 0.500 ppm / (0.663 * 2.43)

C(X) = 1.32 ppm

Because 5 mL of the analyte solution were diluted to 10 mL, the concentration is actually 2 * 1.32 ppm = 2.64 ppm.

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To determine the total number of elements in a chemical formula is being able to recognise the elements of the chemical formula.

An element is defined as the chemical substance that cannot further be divided by any chemical process into smaller particles.

A chemical formula is a representation for a chemical compound or molecules which contains one or more elements with the number of atoms attached as a subscript.

An example of a chemical formula is NaCl. This chemical formula contains one element of sodium (Na) and one element of chlorine (Cl).

In order to determine the total number of elements in a chemical formula, the elements should be recognised and the subscript attached to the element shows the number of atoms of the element found in that particular formula.

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Answer: Homogenous mixture

Mixing honey with water will give you a homogenous mixture. It is uniform and even, as the honey particles are distributed equally throughout the water.

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The volume of the balloon when the balloon descended down in the water becomes 0.0217 Liters.

We know, from the Boyle's Law,

If the temperature of a gas is kept constant, the pressure of the gas and the volume of the gas becomes inversely proportional to each other.

So, we can write,

P₁V₁ = P₂V₂

Where,

P₁ is the initial pressure of the gas,

V₁ is the initial volume of the gas,

P₂ is the final pressure of the gas,

V₂ is the final volume of the gas.

According to the given condition, the initial volume of the ideal gas was 1.52 L and the initial pressure of the gas is 1 atm and the final pressure of the gas is 70 atm while the final volume is unknown,

So,

1.52 x 1 = V₂ x 70

V₂ = 0.0217 Liters.

The final Volume of the gas is 0.0217 Liters.

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When GPR resin is setting, it gets hot. The type of reaction is this (exothermic or endothermic) is endothermic reaction. In terms of energy transfer energy is absorbed from its surrounding in form of heat.

Endothermic reaction occurs when heat is  absorbed by the system from surrounding. while Exothermic reaction occurs when heat is released by the system in surrounding. In endothermic reaction , the system absorbed the energy from its surrounding in the form of heat.

Thus, When GPR resin is setting, it gets hot. The type of reaction is this (exothermic or endothermic) is endothermic reaction. In terms of energy transfer energy is absorbed from its surrounding in form of heat.

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Answer:

1H2+1O2—>H2O2

Explanation:

Use the integer+1

The percent by mass concentration of calcium chloride is 0.20%

What is mass concentration?

Mass concentration, which is a quantity to measure this same concentration of a solute in the solution, is similar to molar concentration, molality, and mass fraction. It reveals how much of a solute there is in a certain volume of solution. Let's use coffee as an example to try to understand it. By combining coffee, sugar, and hot water, a straightforward instant coffee can be made. 10 g of coffee and 5 g of sugar are required to make a typical cup (250 mL) of coffee. Depending on individual preferences, the sum may change. We will need twice as much of the ingredients—20 g of caffeine and 10 g of sugar—to make two cups (500 mL).

When the mass of a solute as well as the mass of a solution are given, the mass percent is employed to express this same concentration of a solution:

Mass Percent=Mass of Solute/Mass of Solution×100%

% by mass = mass of substance/ mass of solution * 100 %

                   = 1.54/750*100 % = 0.20%

The percent by mass concentration of calcium chloride is 0.20%

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The percent of sodium hypochlorite in the bleach sample is calculated to be 9.44% if 3.06 g of sodium hypochlorite is present.

Percentage can be calculated by dividing a value by the total value and then multiplying the resultant by 100.

In this case, we can determine the percentage of sodium hypochlorite in the bleach sample by dividing the mass of sodium hypochlorite by the total mass of the sample and then multiplying the resultant by 100 as follows;

percent of sodium hypochlorite = (mass of sodium hypochlorite/mass of sample) × 100

As 3.06 g of sodium hypochlorite is present in 32.4 g of the sample of bleach, substituting these values in the equation as follows;

percent of sodium hypochlorite = (3.06 ÷ 32.4) × 100

percent of sodium hypochlorite = 0.0944 × 100

percent of sodium hypochlorite = 9.44%

Therefore the percentage of sodium hypochlorite in the bleach sample is calculated to be 9.44%.

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Answer:

1st box: Potential

2nd box: Electrical

3rd box: Kinetic

Explanation:

(1st box) Potential because the energy is stored and ready to act, which is definitely something desired for a battery.

(2nd box) Chemical, as discussed in the comments

(3rd box) Kinetic because the stored, potential energy is now 'acting' or 'in motion', causing it to be kinetic energy.

Answer:

Batteries store potential chemical energy

That the swith releases it into kinetic energy to light the room.

Explanation:

Energy comes in two main forms:

2. Potential energy which is energy stored in object to be realesed to make effect. It can be stored in form of

And there is much more....

Principle of conservation of energy says energy is not created nor destroyed but transferred from and object to another in different forms.