A reaction where heat is added is a(n)
endothermic reaction
heterogeneous reaction
reversible reaction

a) As we can see, on of the reactant has atoms Fe and O, while the other has only C. On the products side, it is the opposite, Fe is alone and C is with O, so the O atoms went from Fe to C, which means this is a single displancemente reaction, since one of the atoms was diplaces from one compound to tthe other.

b) This reaction starts with only one compound and ends with more than one product. This is characteristics of a decomposition reaction, where one compound is decomposed into two of more others.

c) In this reaction, we can see that we have a compound reacting with O₂ and forming only CO₂ and H₂O, and there are energy being released.

This is characteristics of a combustion reaction, which is a reaction where a given compound reacts with O₂ and releases energy, forming CO₂ and H₂O.

The statements that are true are:

The Ni(s)/Ni2+ (aq) serves as the cathode.

The electrons flow from the Ni(s) to the Sn(s).

The electrons flow from the cathode to the anode.

In an electrolytic cell, oxidation occurs at the anode.

In an electrolytic cell, the electrode with the lower reduction potential, or the cathode, is the one from which electrons flow. Since Ni(s)/Ni2+ (aq) has a reduction potential of -0.25V, it is the cathode of the cell. The electrons flow from the cathode to the anode, which has a higher reduction potential. In this case, the anode is Sn(s)/Sn2+ (aq), which has a reduction potential of -0.14V. The electrons flow from the Ni(s) to the Sn(s) so that oxidation occurs at the anode, as electrons are removed from the system. A salt bridge is required to complete the circuit, as it allows for the flow of ions between the two solutions. A power supply is also required, but the voltage is not specified in the question. Thus, the statement that a minimum of 0.10V is required from a power supply for electrons to flow in the electrolytic cell is false.

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Answer:

Calculate the mass of BR -79? Bromine has 2 naturally occurring isotopes (Br-79 and Br-81) and has an atomic mass of 79.904 amu

Explanation:

if i get this wrong srry

Answer:

See the answer below.

Explanation:

If an aqueous solution of two salts contains both Na2CO3 and Na2SO4, the following steps will prove the occurrence of both carbonate and sulphate ions:

1. Add a dilute acid (such as HCl) to the solution. The presence of carbonate ion will result in the release of carbon dioxide gas which will be shown by formation of effervescent bubbles. The gas can be proven to be carbon dioxide by channeling it into a lime water which usually turns milky with the presence of the gas.

\(CO^{2-}_3(aq) + 2H^+(aq) ==> H_2O(l) + CO_2(g)\)

2. Add barium chloride to an acidified portion of the aqueous solution. The presence of sulphate ion will be indicated by the formation of white barium sulphate precipitate. Initial acidification is done to disperse off any carbonate ion that might be present in the solution and give a false-positive white precipitate result.

\(Ba^{2+}(aq) + SO^{2-}_4(aq) --> BaSO_4(s)\)

Answer:

A 2.8 liters

Explanation:

Step 1: Write the balanced equation

N₂ + 3 H₂ ⇄ 2 NH₃

Step 2: Establish the appropriate volume ratio

At the same temperature and pressure, the volume ratio of H₂ to NH₃ is 3:2.

Step 3: Calculate the volume of ammonia produced from 4.2 L of hydrogen

4.2 L H₂ × 2 L NH₃/3 L H₂ = 2.8 L

The mass of the plastic bag, baking soda, and vinegar before the reaction was equal to the mass after the reaction. Option A.

Atoms, mass, and energy are conserved during chemical reactions. Even though their forms may change after reactions.

For a reaction involving vinegar and baking soda, the equation can be expressed as:

vinegar + baking soda ---> carbon dioxide + sodium acetate + water

or

\(CH_3COOH (aq) + NaHCO_3 (aq) --- > CH_3COONa (aq) + H_2O (l) + CO_2 (g)\)

In other words, sodium acetate, water, and carbon dioxide gas are produced in the reaction. Assuming that the reaction vessel is not sealed, the gas would escape away from the vessel.

Since the vessel was sealed, the mass of the plastic bag, baking soda, and vinegar before the reaction will be equal to the sum of the masses of the plastic bag and the products after the reaction.

This will show that the number of atoms present before the reaction is the same as the number of atoms present after the reaction.

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Stoichiometry is used in formulating airbags that shows relationship between product and reactants.

The quick chemical decomposition of solid sodium azide (NaN3) that allows the air bag to inflate fast at any time when the car hit anything. The decomposition reaction is initiated in a car by a small ignition that occurs due to collision sensing mechanism. The nitrogen gas produced during the reaction inflates the air bag which protect the person in the car.

So we can conclude that Stoichiometry is used in formulating airbags that shows relationship between product and reactants.

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Stoichiometry is important in formulating airbags, producing contrails, or formulating rocket engines so as to ensure the required amount of products are formed.

Stoichiometry is the molar relationship between the reactants and products of a reaction.

It is the ratio in which moles of reactants of a reaction combine to form moles of products.

Stoichiometry is important in determining the amount of reactants required to produce a given amount of products.

For example, stoichiometry is important in formulating airbags, producing contrails, or formulating rocket engines in order to ensure the mass of reactants used is enough to produce the required products.

In conclusion, stoichiometry of  a reaction provides the knowledge about the amount of reactants required to form products.

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The statement that is true regarding valence electrons is that they are the outermost electrons (option C).

Valence electrons in chemistry are any of the electrons in the outermost shell of an atom. They are capable of forming bonds with other atoms.

In chemistry and physics, a valence electron is an electron in the outer shell associated with an atom, and that can participate in the formation of a chemical bond if the outer shell is not closed.

For neutral atoms, the number of valence electrons is equal to the atom's main group number. The main group number for an element can be found from its column on the periodic table. For example, carbon is in group 4 and has 4 valence electrons.

Therefore, options A, B and D are incorrect making option C the correct option regarding valence electrons.

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Answer:

people ,shape ,behavior, grades ,friends

you need to add 1.79 mL of 3.0 M HCl to react with 0.45 g of NaHCO3 and produce the most NaCl.

To determine how much 3.0 M HCl is needed to react with 0.45 g of sodium hydrogen carbonate (NaHCO3) and get the most NaCl, you need to first calculate the number of moles of NaHCO3 that you have:

molar mass of NaHCO3 = 84.01 g/mol

moles of NaHCO3 = mass / molar mass = 0.45 g / 84.01 g/mol = 0.00536 mol

Next, you need to determine the stoichiometry of the reaction between NaHCO3 and HCl. The balanced chemical equation for this reaction is:

NaHCO3 + HCl → NaCl + H2O + CO2

From this equation, you can see that one mole of NaHCO3 reacts with one mole of HCl to produce one mole of NaCl. Therefore, you need 0.00536 moles of HCl to react with 0.00536 moles of NaHCO3.

To calculate the volume of 3.0 M HCl needed to provide 0.00536 moles of HCl, you can use the following equation:

moles of solute = concentration x volume of solution (in liters)

Rearranging this equation to solve for the volume of solution gives:

the volume of solution = moles of solute/concentration

Plugging in the values gives:

volume of solution = 0.00536 mol / 3.0 mol/L = 0.00179 L or 1.79 mL

Therefore, you need to add 1.79 mL of 3.0 M HCl to react with 0.45 g of NaHCO3 and produce the most NaCl.

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Answer:

1. Materials: One of the biggest challenges in making better batteries is finding the right materials that can store more energy and last longer. The materials need to be efficient in terms of energy density, cost, and environmental impact.

2. Manufacturing: The production of batteries is a complex and expensive process that requires specialized knowledge and equipment. Scaling up production can be a challenge, and the cost of manufacturing high-quality batteries is still relatively high.

3. Safety: The safety of batteries is a major concern. The risk of fire or explosion is always present, particularly with lithium-ion batteries. Improvements in battery safety are needed to reduce the risk of accidents and increase confidence in battery technology.

4. Environmental impact: The production and disposal of batteries can have a significant environmental impact. The mining of metals and other materials used in batteries can have negative environmental consequences, and the disposal of used batteries can lead to pollution.

5. Performance: The performance of batteries can be affected by temperature, humidity, and other environmental factors. Improving battery performance in extreme conditions and increasing their durability is a priority for the industry.

Answer: Light, Chemical

Explanation: This is the answer because "photosynthesis takes place in two stages: the light-dependent reactions and the Calvin cycle. In the light-dependent reactions, which take place at the thylakoid membrane, chlorophyll absorbs energy from sunlight and then converts it into chemical energy with the use of water." - source https://opentextbc.ca/

In the photosynthesis the energy starts as Light energy and ends up as Chemical Energy. Hence option (D) is correct

The process by that inexperienced plants and a few different organisms use daylight to synthesize nutrients from carbonic acid gas and water. chemical action in plants usually involves the inexperienced pigment and generates element as a by-product.

Photosynthesis may be a method employed by plants and different organisms to convert lightweight energy into energy that, through internal respiration, will later be discharged to fuel the organism's activities.

photosynthesis takes place in 2 stages: the light-dependent reactions and also the Calvin cycle. within the light-dependent reactions, that manifest itself at the thylakoid membrane, pigment absorbs energy from daylight and so converts it into energy with the employment of water.

Therefore, In the photosynthesis the energy starts as Light energy and ends up as Chemical Energy. Hence option (D) is correct

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Answer:

The mass number of the stable daughter product is 208

Explanation:

First thing's first, we have to write out the equation of the reaction. This is given as;

²³²₉₀Th → 6 ⁴₂α  +  4 ⁰₋₁ β + X

In order to obtain the identity of X, we have to obtain it's mass numbers and atomic number.

There is conservation of matter so we expect the mass number to remain the same in both the reactant and products.

Mass Number

Reactant = 232

Product = (6* 4 = 24) + (4 * 0 = 0) + x = 24 + x

since reactant = product

232 = 24 + x

x = 232 - 24 = 208

Atomic Number

Reactant = 90

Product = (6* 2 = 12) + (4 * -1 = -4) + x = 8 + x

since reactant = product

90 = 8 + x

x = 90 - 8 = 82

Answer:

A. Texture

Explanation:

Everything else is a chemical reaction

Answer:

1.76 moles of HCl.

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

2KMnO₄ + 8HCl —> 3Cl₂ + 2MnO₂ + 4H₂O + 2KCl

From the balanced equation above,

2 moles of KMnO₄ reacted with 8 moles of HCl.

Finally, we shall determine the number of mole of HCl needed to react with 0.44 moles of KMnO₄. This can be obtained as follow:

From the balanced equation above,

2 moles of KMnO₄ reacted with 8 moles of HCl.

Therefore, 0.44 moles of KMnO₄ will react with = (0.44 × 8)/2 = 1.76 moles of HCl.

Thus, 1.76 moles of HCl is needed for the reaction.

Although there is some variation amongst tissues, the physiologically typical intracellular pH ranges from 7.0 to 7.4. Skeletal muscle in mammals typically has a pHi of 6.8 to 7.1.

A cell is the basic membrane-bound living thing and can either have one or more cells. All the molecules required for an organism to function are found in cells. An atomic is 10-10m in size. In contrast, a cellular is 10-6 metres in size. Because all cells are composed of atoms, they are therefore bigger than atoms.

Acid excretion, efflux through plasma membranes, and buffering mechanisms all work together to precisely preserve the pH of body fluids. Protons are extruded from the cytosol into the extracellular space through the organic cation transporter (MCT) and the Na+/H+ exchanger (NHE).

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Answer:

C

Explanation:

because then you'd be able to make a group to raid, run with you, and save more people.

If a snail crawls 55 inches per day ,the snail will crawl approximately \(3.2 * 10^3 centimeters.\)

To convert inches to centimeters, we need to use the conversion factor: 1 inch = 2.54 centimeters.

First, let's calculate the distance the snail crawls in inches in 23 days. We can multiply the daily distance by the number of days:

Distance in inches = 55 inches/day × 23 days = 1265 inches.

Now, to convert the distance from inches to centimeters, we multiply the distance in inches by the conversion factor:

Distance in centimeters = 1265 inches × 2.54 cm/inch = 3215.1 cm.

Rounding to the appropriate number of significant figures, the snail will crawl approximately 3215 cm or \(3.2 * 10^3 centimeters.\) in 23 days.

Therefore, the answer is  Option 3:\(3.2 * 10^3 centimeters.\)

This means that in 23 days, the snail will crawl approximately\(3.2 * 10^3 centimeters.\)

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Approximately 631.5 liters of dry air at 25°C and 750 torr would need to be processed to produce 150 liters of liquid \(O_2\) -183°C.

To solve this problem, we need to consider the ideal gas law and the molar volume of gases.

First, we can calculate the number of moles of oxygen in 150 L of liquid \(O_2\) at -183°C. To do this, we divide the mass of liquid oxygen by its molar mass:

Mass of liquid oxygen = volume of liquid oxygen * density of liquid oxygen = 150 L * 1.14 g/mL = 171 g

Molar mass of oxygen (O2) = 32 g/mol

Number of moles of oxygen = mass of oxygen / molar mass of oxygen = 171 g / 32 g/mol ≈ 5.34 mol

Since the mole fraction of oxygen in dry air is given as 0.21, we can calculate the total moles of dry air needed to produce 5.34 mol of oxygen:

Moles of dry air = moles of oxygen / mole fraction of oxygen = 5.34 mol / 0.21 ≈ 25.43 mol

Now, we can use the ideal gas law to calculate the volume of dry air at 25°C and 750 torr (convert to atm) that corresponds to 25.43 mol:

PV = nRT

P = 750 torr * (1 atm / 760 torr) ≈ 0.987 atm

V = volume of dry air (unknown)

n = 25.43 mol

R = 0.0821 L·atm/(mol·K)

T = 25°C + 273.15 = 298.15 K

Solving for V:

V = nRT / P = (25.43 mol)(0.0821 L·atm/(mol·K))(298.15 K) / 0.987 atm ≈ 631.5 L

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Answer:

179 K

Explanation:

From the question given above, the following data were:

Initial pressure (P₁) = 1480 mm Hg

Initial temperature (T₁) = 478 K

Final pressure (P₂) = 555 mm Hg

Final temperature (T₂) =?

The final temperature of the gas can be obtained as follow:

P₁/T₁ = P₂/T₂

1480 / 478 = 555 / T₂

Cross multiply

1480 × T₂ = 478 × 555

1480 × T₂ = 265290

Divide both side by 1480

T₂ = 265290 / 1480

T₂ ≈ 179 K

Therefore, the final temperature of the gas is 179 K

Answer:

400 mL

Explanation:

Boyle's Law: \(P_1*V_1 = P_2*V_2\)

Let x = the resulting volume

350 (200) = 700 (x)

x = 400 mL

Taking into account the reaction stoichiometry, a mass of 6.24 grams of Ba(OH)₂ are required to react with 12.2 grams of caesium phosphate.

In first place, the balanced reaction is:

3 Ba(OH)₂ + 2 Cs₃PO₄ → Ba₃(PO₄)₂ + 6 CsOH

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: If by reaction stoichiometry 987.4 grams of Cs₃PO₄ react with 504.9 grams of Ba(OH)₂, 12.2 grams of Cs₃PO₄ react with how much mass of Ba(OH)₂?

mass of Ba(OH)₂= (12.2 grams of Cs₃PO₄× 504.9 grams of Ba(OH)₂)÷ 987.4 grams of Cs₃PO₄

mass of Ba(OH)₂= 6.24 grams

Finally, a mass of 6.24 grams of Ba(OH)₂ are required.

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The temperature increase from 20 °C to 46 °C indicates that the reaction between zinc and copper sulfate solution is exothermic, with heat being released into the surroundings.

In the given reaction between zinc and copper sulfate solution, the temperature change can provide insights into the type of heat change occurring during the reaction. Based on the provided information, the initial temperature of the copper sulfate solution was 20 °C, and the final temperature of the mixture after the reaction was 46 °C.

The temperature increase observed in this reaction indicates an exothermic heat change. An exothermic reaction releases heat energy into the surroundings, resulting in a temperature rise. In this case, the reaction between zinc and copper sulfate solution is exothermic because the final temperature is higher than the initial temperature.

During the reaction, zinc displaces copper from copper sulfate to form zinc sulfate and copper metal. This displacement reaction is known as a single displacement or redox reaction. Zinc is more reactive than copper and therefore replaces copper in the compound.

The formation of new chemical bonds during the reaction releases energy in the form of heat. This energy is transferred to the surroundings, leading to an increase in temperature. The heat released is greater than the heat absorbed, resulting in a net increase in temperature.

The exothermic nature of this reaction can be explained by the difference in bond energies between the reactants and products. The breaking of bonds in the reactants requires energy input, while the formation of new bonds in the products releases energy.

In this case, the energy released during the formation of zinc sulfate and copper metal is greater than the energy required to break the bonds in copper sulfate and zinc.

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Answer:

2NaOH (aq) + CaCl2 (aq) -> 2NaCl(aq) + Ca(OH)2(s)

Formula of precipitate: Ca(OH)2 (s)

Explanation:

First, we do the double replacement reaction to determine our chemical equation between the reactants and products. Once we have our products, with a solubility chart (I added one below) we can determine which of the products is soluble or insoluble.

In this case NaCl is soluble or aqueous (meaning it can dissolve in water) and Ca(OH)2 is insoluble (meaning that when the reactions takes place, these two will form a solid/precipitate)

134.3 liters of oxygen gas at STP could be produced from 500.0 g of potassium chlorate.

We can use the ideal gas law to find the volume of hydrogen at STP (standard temperature and pressure, 0°C and 1 atm) that would contain 58.7 moles: PV = nRT

(1 atm) V = (58.7 mol) (0.08206 L atm/mol K) (273.15 K), V = 1,275 L

Finally, we can use the ideal gas law to calculate the volume of O2 produced at STP (standard temperature and pressure, which is 0°C and 1 atm):

PV = nRT

V = nRT / P

V = (6.12 mol)(0.0821 L•atm/mol•K)(273 K) / 1 atm

V = 134.3 L

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Answer

Solid

liquid

Gas

Explanation: