ASAP!! PLEASE!!!! Colbat has a mass number of 59 and an atomic number of 27. A student wants to create a model of a cobalt atom. Which statement about the model is correct?

Copper, stainless steel, carbon steel, and zinc were all heated using 10,000 joules of thermal energy. So, carbon steel would have the largest change in temperature.

Change in thermal energy is calculated with the following formula: Change in thermal energy = mass x specific heat capacity x change in temperature.

Given data :

Specific heat capacity of copper is = 389 J/(kg·K)

Specific heat capacity of stainless steel is = 466 J/(kg·K)

Specific heat capacity of carbon steel is = 710 J/(kg·K)

Specific heat capacity of zinc is = 388 J/(kg·K)

Using formula we can identify the largest change in temperature:

Q = m.c. ΔT

The material which will have the greatest specific heat capacity among copper, stainless steel, carbon steel, and zinc will have the greatest change in temperature.

Hence, carbon steel will have greatest change in temperature.

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Answer: d) is correct

Explanation:

a) burning trees creates more carbon emissions

b) dead trees cannot turn co2 into oxygen and destroying them releases co2 in wood and soil

c) transpiration from plants creates 10% of the atmosphere's moisture, the rest being oceans, rivers and lakes

The water in the water cycle changes states as it moves through the cycle, it can be a solid, liquid or a gas. The given statement is true.

Condensation is the transformation of a substance from a gas to a liquid. Condensation happens when rain is produced from water vapor that is present in the upper atmosphere as clouds.The dispersal of water from clouds as rain or snow is known as precipitation. In this manner, the water that has evaporated from the atmosphere returns to the planet.

When a water body's liquid water evaporates as a result of the heat in the air, this is known as evaporation. Water vapors are formed when this water evaporates. When water vapor reaches upper atmospheres, clouds start to form. Transpiration is the process by which water is lost by aerated plant components like leaves and stems. The atmosphere receives this water's evaporation.

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Answer:

Astatine: Halogen

Nitrogen: Non-Metal

Krypton: Non-Metal, Noble Gas

Chlorine: Non-Metal

Sulfur: Non-metal

Explanation:

Methyl red is an azo dye with the chemical formula C15H14N3NaO2S. It is an indicator used in titration to recognize pH values. It can be used to indicate a pH range of 4.2 to 6.3; at pH 4.2, it is red, and at pH 6.3, it is yellow. At a pH of 5.1, it turns orange.

The color of the indicator when the solution comprises mostly protonated methyl red is red. This is because it is most commonly used in titration to determine the pH of a solution between pH 4.2 and 6.3, and it turns red at a pH of 4.2.

The methyl red pH indicator, on the other hand, switches from red to yellow as the pH of the solution rises from 4.2 to 6.3. When the methyl red solution is more protonated, it becomes reddish-orange. If the solution contains more hydroxide ions than hydrogen ions, the indicator will change color to yellow.

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Answer:

943.82 ml

Explanation:

Assuming constant pressure

V1/T1 = V2/T2

T2 * V1/T1 = V2       ( T must be in K units)

(220 + 273.15) * 540 / (273.15 + 9) = 943.8 ml

Approximately 189.52 grams of helium must be added to the cylinder to reach its maximum pressure allowed.

To solve this problem, we need to consider the ideal gas law, which states that PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.

First, we need to convert the temperature from Celsius to Kelvin:

T = 147°C + 273.15 = 420.15 K

We can calculate the number of moles of nitrogen gas using the ideal gas law:

n = PV / RT

Given:

P = 1310 mmHg (we'll convert this to atm)

V = 550 L

R = 0.0821 L·atm/(K·mol)

T = 420.15 K

Converting pressure from mmHg to atm:

P = 1310 mmHg / 760 mmHg/atm = 1.7237 atm

Calculating the number of moles of nitrogen gas:

n = (1.7237 atm) * (550 L) / (0.0821 L·atm/(K·mol) * 420.15 K)

n ≈ 47.38 moles

Now, we need to determine the number of grams of helium gas needed to reach the maximum pressure allowed. Since helium is an ideal gas, we can use the same equation and solve for the mass (m) using the molar mass of helium (4 g/mol):

m = n * M

Given:

n = 47.38 moles

M (molar mass of helium) = 4 g/mol

Calculating the mass of helium:

m = 47.38 moles * 4 g/mol

m ≈ 189.52 grams

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Answer:

I think it's c I hope this helps

Answer:

The loosening of soil and they bind the soil with the help of the roots

Explanation:

Here, we want to know how plants prevent erosion by wind or water.

The way they do this is by binding the soil with their roots such that it will not be easy for the erosion agent to erode the surface.

How they do this is by making sure that the soil

particles are binded together with their roots which helps to keep the particles of the soil intact and not eroded

Answer:

c

Explanation:

Answer:

When a solid turns directly to a gas this is called sublimation. From the graph it can be seen if the pressure is raised to ~5 atm as the CO2 warms up, it will pass through its triple point.

Explanation:

Answer:If the pressure is raised to ~5 atm as the CO2 warms up, it will pass through its triple point.

Explanation:

Answer:

Na+ is smaller than Na because, it has given away one electron because of which the electron shielding gets stronger due to more protons and less electrons. Whereas, Cl- is larger than Cl because it has gained an extra electron and so, the no.07‏/12‏/2010

Explanation:

Answer:

(B) SECONDARY ALKYL HALIDE

Theoretical yield of copper is 7.22 g when 4.25g of iron in the chemical reaction.

2Fe(s) + 3Cu2(aq.) ---->  2Fe3(aq.)  + 3Cu (s)

Molar mass of Iron (Fe) is 56g/mole.

Molar mass of copper (cu) is 63.5g/mole.

2 mole ( 2 * 56g/mole) Iron produces = 3 mole ( 3 * 63.5g/mole ) copper

Theoretical yield is the maximum amount of product that could be formed from the given amounts of reactants. The actual yield is the amount of product that is actually formed when the reaction is carried out in the laboratory. The theoretical yield is the amount of product that would be formed from a reaction if it was 100% efficient.

There are 4. 25 g of Iron .so,

4.25 g Iron produces = (3 * 63.5g / 2 * 56 g ) * 4.25 g copper

                                     = 7.22 g copper

Theoretical yield of copper is 7.22g.

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Answer:

nector

Explanation:

Answer:

True,When fluorine gas is put into contact with calcium metal at high temperatures, calcium fluoride powder is created in an exothermic reaction.

Answer:

\(it \: is : \\nuleic\: force\: of\: ( attraction \: and \: repulsion).\)

Explanation:

\(this \: is \: because, \: for \: any \: type \: of \: chemical \\\: combination \: (bonding) \: to \: be \: possible, \\ there \: must \: exist\: an \: equilibrium \: between \: \\ the \: force \: of \: attraction \: and \: repulsion.\)

Answer:

bonds are formed by joining atoms whether same or different elements to form molecules by uses of forces of attractions

Titration is the best investigation to identify an unknown liquid as acidic, basic, or neutral by measuring its pH level.

A student finds an unlabeled bottle of liquid under his kitchen sink. Titration is the investigation that would best help him identify the unknown liquid as acidic, basic, or neutral.

Titration is the chemical method used to find the amount of acid or base in a given substance. This method is a laboratory technique used to measure the concentration of a known solution (the titrant) with a solution of an unknown concentration (the analyte).

The unknown solution is slowly added to the known solution until it reacts completely, allowing us to calculate the concentration of the unknown solution. Titration may be used to identify an unknown solution as acidic, neutral, or basic by determining its pH level. It's a highly precise technique that's often used in analytical chemistry laboratories to measure the concentration of chemicals.

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The value for the molar volume of an ideal gas at STP is very important with regard to stoichiometric calculations. At 273 K, and 1 atm, 1 mole of any gas behaving ideally occupies a volume of 22.414 L.

The volume of a sample of gas at STP is:

Number of moles = V₀ in L / 22.414

1) V₀ in L = 2.5 × 22.414 = 56.035 L

2) 0.83 × 22.414 = 18.60 L

3) 6.8 × 22.414 = 152.41 L

4) 184 × 22.414 = 4124.17 L

5) 4.0 / 22.414 = 0.17 moles

6) 5.6 / 22.414 = 0.24 moles

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Separating anthracene from benzoic acid via an extraction between ethyl acetate and a basic aqueous solution in a separatory funnel. you recover the anthracene would be recovered by the  collecting the top layer, and then dry with Na₂SO₄  and then evaporate the solvent.

The anthracene and the benzoic acid both are acidic so it is not possible to sperate both normally. so,  we would sperate it from ethyl acetate and a basic aqueous solution and then dry it with Na₂SO₄ , so that it can absorbed the benzoic acid.

Thus, Separating anthracene from benzoic acid via an extraction between ethyl acetate and a basic aqueous solution in a separatory funnel. you recover the anthracene would be recovered by the  collecting the top layer, and then dry with Na₂SO₄  and then evaporate the solvent.

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Answer:

9 moles

Explanation:

The balanced chemical equation for this decomposition reaction is as follows:

2KCIO3 → 2KCI+ 302

Based on this equation, 2 moles of potassium chlorate (KCIO3) decomposes to form 3 moles of oxygen gas (O2).

Hence, 6 moles of pottasium chlorate will decompose to produce;

6 × 3 ÷ 2

= 18 ÷ 2

= 9 moles of O2.

The mole fraction of ethanol (C₂H₅OH) in the solution is approximately 0.042. The molality of the aqueous solution is approximately 1.21 mol/kg.

1. Mole fraction of ethanol (C₂H₅OH):

The mole fraction of a component in a solution is the ratio of the moles of that component to the total moles of all components in the solution. To calculate the mole fraction of ethanol, we first need to determine the moles of ethanol and water in the solution.

The molar mass of C₂H₅OH is calculated as follows:

(2 * molar mass of C) + (6 * molar mass of H) + molar mass of O

(2 * 12.01 g/mol) + (6 * 1.01 g/mol) + 16.00 g/mol = 46.07 g/mol

Next, we calculate the moles of ethanol:

moles of ethanol = mass of ethanol / molar mass of ethanol

moles of ethanol = 47.5 g / 46.07 g/mol ≈ 1.03 mol

Then, we calculate the moles of water:

moles of water = mass of water / molar mass of water

moles of water = 850 g / 18.02 g/mol ≈ 47.2 mol

Now, we can calculate the mole fraction of ethanol:

mole fraction of ethanol = moles of ethanol / (moles of ethanol + moles of water)

mole fraction of ethanol = 1.03 mol / (1.03 mol + 47.2 mol) ≈ 0.021

Therefore, the mole fraction of ethanol in the solution is approximately 0.042.

2. Molality of the aqueous solution:

Molality is a measure of the concentration of a solute in a solution, expressed in moles of solute per kilogram of solvent. In this case, the solute is ethanol (C₂H₅OH), and the solvent is water.

The molality is calculated as follows:

molality = moles of solute / mass of solvent (in kg)

We have already determined the moles of ethanol to be approximately 1.03 mol. The mass of water in kg can be obtained by dividing the mass of water by 1000:

mass of water (in kg) = 850 g / 1000 = 0.85 kg

Now, we can calculate the molality:

molality = 1.03 mol / 0.85 kg ≈ 1.21 mol/kg

Therefore, the molality of the aqueous solution is approximately 1.21 mol/kg.

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Answer:

Acceleration

Explanation:

Acceleration doesn't change one moment to the next, and therefore, doesn't count as a force.

The answer option which is not a force is: C. Acceleration.

A force can be defined as a push or pull of an object or physical body, which typically results in a change of motion (acceleration), especially due to the interaction of the object with another.

In Science, the three (3) most common examples of a force include the following:

In conclusion, acceleration is not an example of a force but a change in the rate of velocity of an object with respect to time.

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The insecticides could kill the owls but not the grasshopper or mice due to no resistance in owls as compared to grasshopper and owl.

The insecticides could kill the owls but not the grasshopper or mice because the active ingredients in that insecticide is harmful for owls while on the other hand, the grasshopper and mice are tolerant to that insecticide.

So we can conclude that the insecticides could kill the owls but not the grasshopper or mice due to no resistance in owls as compared to grasshopper and owl.

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Answer:

I can't understand your language? can you write in English

I'm sorry

Explanation:

density can be changed by changing either the pressure or the temperature. Increasing the pressure always increases the density of a material. Increasing the temperature generally decreases the density, but there are notable exceptions to this generalization.

Answer:

The claim is: Therefore Mitosis requires less energy than sexual reproduction does.

Explanation:

The entropy change to make 1 mole of \(SO_{3}\) for the reaction is option d -94.8 \(JK^{-1}mol^{-1}\).

To calculate the entropy change to make 1 mole of \(SO_{3}\) for the given reaction, we can use the formula:

ΔS = ΣS(products) - ΣS(reactants)

Where ΔS is the entropy change, ΣS(products) is the sum of the molar entropies of the products, and ΣS(reactants) is the sum of the molar entropies of the reactants.

For this reaction, the entropy values (S) for each substance are:
\(SO_{2}\)(g): 248.2 \(JK^{-1}mol^{-1}\)
\(O_{2}\)(g): 205.0 \(JK^{-1}mol^{-1}\)
\(SO_{3}\)(g): 256.2\(JK^{-1}mol^{-1}\)

Using the provided molar entropies:

ΔS = (256.2 \(JK^{-1}mol^{-1}\)) - [(248.2 \(JK^{-1}mol^{-1}\)) + (1/2)(205.0\(JK^{-1}mol^{-1}\))]
ΔS = 256.8\(JK^{-1}mol^{-1}\) - 351 \(JK^{-1}mol^{-1}\)
ΔS = -94.8 \(JK^{-1}mol^{-1}\)

Therefore, the entropy change to make 1 mole of \(SO_{3}\) for the reaction is option d -94.8\(JK^{-1}mol^{-1}\).

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The complete question is:

What is the entropy change to make 1 mole of\(SO_3\) for the reaction \(SO_2(g) + 1 /2 O_2(g)\) → \(SO_3(g)\)

The \(S^{o}\)  values for \(SO _2 ,O_2\)  and\(SO_3\) are 248.5,205.0 and 256.2 \(JK^{-1}\)\(mol^{-1}\)

a)94.2 \(JK^{-1}mol^{-1}\)

b)64.2\(JK^{-1}mol^{-1}\)

c)-30.2\(JK^{-1}mol^{-1}\)

d)-94.2\(JK^{-1}mol^{-1}\)

Answer:

Aqua regia is a corrosive, fuming yellow solution that is a 1:3 mixture of concentrated nitric and hydrochloric acids.

Aqua regia is a mixture of hydrochloric acid (HCl) and nitric acid (HNO3) at a ratio of either 3:1 or 4:1. It is a reddish-orange or yellowish-orange fuming liquid. The term is a Latin phrase, meaning "king's water". The name reflects the ability of aqua regia to dissolve the noble metals gold, platinum, and palladium.