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Answer:

50 C?

Explanation:

90 - 40 = 50 So 50 degrees celsius is your answer

Answer: pretty sure its C

Explanation:

Answer:

I would use calorimetric to determine the specific heat and I would measure the mass of a sample

Explanation:

I would use calorimetry to determine the specific heat.

I would measure the mass of a sample of the substance.

I would heat the substance to a known temperature.

I would place the heated substance into a coffee-cup calorimeter containing a known mass of water with a known initial temperature.

I would wait for the temperature to equilibrate, then calculate temperature change.

I would use the temperature change of water to determine the amount of energy absorbed.

I would use the amount of energy lost by substance, mass, and temperature change to calculate specific heat.

Answer:

I would use calorimetry to determine the specific heat. Then I would measure the mass of a sample of the substance. After that I would heat the substance to a known temperature. I would place the heated substance into a coffee-cup calorimeter containing a known mass of water with a known initial temperature. The coffee cup would be Styrofoam because it keeps the temperatures on the outside from getting on the inside and I would wait for the temperature to equilibrium, then I would calculate the temperature change. I would use the temperature change of water to determine the amount of energy absorbed. lastly, I would use the amount of energy lost by substance, mass, and temperature change to calculate specific heat.

Explanation:

Answer:

the number of protons

Explanation:

the

Answer: the answer is B!

Explanation: took the quiz

Bases produce salts by reacting with acidic solutions. The strong base releases more ions in the aqueous solution compared to the weak base. Thus, option B is correct.

Strong bases are substances that dissociate completely in the solution to produce hydroxide ions. They are completely ionizable and yield more ions than weak bases. The relative basic strength depends on the formation of the ions.

On the other hand, the weak bases are not capable of dissociating completely and rather partially dissociate to produce hydroxide ions. They yield less number of ions and have relatively less strength.

Sodium hydroxide, potassium hydroxide, cesium hydroxide, etc, are strong bases while, ammonium hydroxide, ammonia, aluminum hydroxide, etc., are weak bases.

Therefore, the strong and weak bases differ on dissociation.

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Answer:

the answer to your question is B) Monotreme.

Explanation:

most mammals do not lay eggs, they give birth. But, monotreme mammals including the duck-billed platypus do in fact lay shelled eggs.

Answer:

i think wait if its cold idk but hot it will burn u

Explanation:

Answer:

0.92787 liters of bromine are needed to produce 12 moles of aluminum bromide.

Explanation:

You have the following balanced equation:

2 Al (s) + 3 Br₂ (l) ⇒ 2 AlBr₃ (s)

First of all, the following rule of three should be applied to know the amount of moles of bromine needed: if 2 moles of aluminum bromide are produced by stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction) for 3 mole of bromine, 12 moles of aluminum bromide with how many moles of bromine are produced?

[tex]moles of bromine=\frac{12 moles of aluminum bromide*3 mole of bromine}{2 mole of aluminum bromide}[/tex]

moles of bromine= 18

Being the molar mass of the bromine Br₂  159.8 g/mol then the mass of 18 moles of Br₂ is:

18 moles* 159.8 g/mol= 2,876.4 grams

Density is a property that indicates the amount of mass per unit volume.  Then the following rule of three applies: if by the definition of density 3.1 grams of bromine are present in 1 mL, 2,876.4 grams of bromine are present in how much volume is it?

[tex]volume=\frac{2,876.4 grams*1mL}{3.1 grams}[/tex]

volume= 927.87 mL

Being 1,000 mL= 1 L, then 927.87 mL= 0.92787 L

0.92787 liters of bromine are needed to produce 12 moles of aluminum bromide.

Answer:

[tex]V=929mL[/tex]

Explanation:

Hello,

In this case, the balanced chemical reaction is:

[tex]2Al (s) + 3Br_2 (l)\rightarrow 2AlBr_3 (s)[/tex]

In such a way, we use the 2:3 molar ratio between aluminum bromide and bromine and its atomic mass which is 160 g/mol to find the grams  of bromine that are produced:

[tex]m_{Br_2}=12molAlBr_3*\frac{3molBr_2}{2molAlBr_3} *\frac{160gBr_2}{1molBr_2} =2880gBr_2[/tex]

Then we compute the volume:

[tex]V=\frac{m}{\rho}=\frac{2880gBr_2}{3.1g/mL}\\ \\V=929mL[/tex]

Regards.

Elements. C. H. N. O

% Composition 57.14 6.16 9.52. 27.18

Molar mass. 12 1. 14. 16

Moles. 4.76. 6.16. 0.68. 1.70

mole ratio 7. 9. 1. 2.5

Multiply by 2

to make it a whole. 7*2. 9*2. 1*2 2.5*2

number

= 14. 18. 2. 5

EMF C14H18N2O5

EMF(n) = MF

12 + 1 + 14 + 16(n) = 294.30

43n = 294.30

n = 7 (to 1 decimal place)

there MF = C14H18N2O5(7)

= C98H126N4O35

The empirical formula of NutraSweet is C14H18N2O5 while the molecular formula is C14H18N2O5

HOW TO CALCULATE EMPIRICAL FORMULA:

57.14% C = 57.14g

6.16% H = 6.16g

9.52% N = 9.52g

27.18% O = 27.18g

C = 57.14g ÷ 12 = 4.762 mol

H = 6.16g ÷ 1 = 6.16 mol

N = 9.52g ÷ 14 = 0.68 mol

O = 27.18g ÷ 16 = 1.699 mol

C = 4.762 ÷ 0.68 = 7.00

H = 6.16 ÷ 0.68 = 9.06

N = 0.68 ÷ 0.68 = 1

O = 1.699 ÷ 0.68 = 2.49

C = 14

H = 18

N = 2

0 = 5

(C14H18N2O5)n = 294.30

12(14) + 1(18) + 14(2) + 16(5) = 294.3

(168 + 18 + 28 + 80) = 294.3

294n = 294.3

n = 294.3/294

n = 1.000

This means that the molecular formula of Nutrasweet is C14H18N2O5.

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Answer:

Fe3+ + 3e– --------> Fe

Explanation:

Reduction refers to a gain of electrons. A specie is said to be reduced when it gains electrons or when it experiences a decrease in oxidation number. The both sentences above can be clearly seen when inspecting a reduction half equation.

Consider the redox reaction half equation;

Fe3+ + 3e– ------>Fe

We can see that Fe^3+ accepted three electrons, the oxidation number of iron thereby decreased from +3 to zero from left to right. This implies that the Fe^3+ was actually reduced according to the equation shown.

Equation which represents a reduction half - reaction is Fe³⁺ + 3e⁻ → Fe.

Reduction is a process in which addition of hydrogen or electron or removal of oxygen takes place.

From the given reaction, only last reaction represents a reduction half -reaction as:

Fe³⁺ + 3e⁻ → Fe

In this reaction on the left side iron is present in +3 oxidation state and due to addition of 3 electrons it converts into Fe atom which is in 0 oxidation state on the right side. So, due to addition of electrons reduction takes place.

Hence, Fe³⁺ + 3e⁻ → Fe represents a reduction half-reaction.

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Answer:

Well, The best answer will be is A. Webbed feet for swimming.

Good Luck!~

[tex]^{Brazts[/tex]

Answer:

webed feet for swimming

Explanation:

i took k-12 test

Answer:

Energy is something very important to people. It helps to light our homes, dry our clothes, and even cook our food. If we didn't have energy I don't know where we'd be. Three types of energy are: Solar Energy, Wind Energy, and Hydro Energy.

Answer:

We need energy because without it we won't be the same. Infact, we won't be alive today. We use energy for everyday things and well, for everything.

Explanation:

3 types of energys are Electric, Atomic and Mechanical.

WOW thank you for 42 points c:

Answer:

Dark matter makes up 85% of the mass of the universe. Dark matter is not directly observable because it doesn't interact with any electromagnetic wave. In the development of the universe, without dark matter, the universe will not function, move or rotate as it does now (this speculation led to the quest to find the anomaly of mass and energy in the known universe, eventually leading to the idealization of dark matter) and will not have enough gravitational force to hold it together.  After the big bang, the presence of dark matter and energy ensured that the newly formed universe didn't just float away, rather, it provided enough gravitational force to hold the universe while still allowing it to expand sufficiently.

The development of the universe would have been different without the universe in the sense that the young universe won't have enough mass to hold it together, and the universe would have simply floated apart. The behavior of the universe would have been different from what we observe now, and some physical laws that applies now will not apply to the universe.

Without dark matter, the universe will neither move, rotate, or be able to function.

It should be noted that dark matter makes up about 85% of the mass of the universe. Dark matter does not interact with an electromagnetic wave.

Without dark matter, the universe will neither move, rotate, or be able to function. After the big bang, the dark matter was vital in providing the gravitational force to hold the universe.

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Answer:

C. sublimation

Option C is correct answer

All of the given phase changes occur at point B on the phase diagram shown in question because point B is the triplet point.

The point at which all three phases meet and exist in the phase diagram is called Triplet point. So all six phase changes occur at that point like sublimation, boiling, melting, condensation, deposition and freezing.

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Answer:

The melting point of Gold is 1064.43 degrees celsius and the boiling point is 2807 degrees celsius.

Answer:

2970 C

Explanation:

It melts at 5387 F and 2970 C

Answer:

Energy is needed to break the bonds of H-H in H2 and Cl-Cl in Cl2

Energy is released when the H-Cl bonds form.

Explanation:

During a chemical reaction, energy is needed to break the bonds between reactants in order for reactants to recombine with each other to form products.

According to the collision theory, chemical reactions occur when reactant particles of appropriate activation energy collide with each other to form the products. This implies that energy must be absorbed in order to break Cl-Cl and H-H bonds in the reactants so that they can collide to form HCl. As the new bond is formed in the product, the excess energy absorbed by the reactants is given off.

Answer:

1. a

2. c

3. b

4. d

5. True

6. True

7. Cold Tundra

8. False

Explanation:

These are the answers. I had the same questions on my science quiz.

Answer:

Absorbs a quantum of energy

Explanation:

Answer:

6) 2.9 moles of KMnO4

7) 1.36×10^-3 moles

8) 2.8×10^-5 moles

Explanation:

6) Number of moles is given as mass/molar mass

Mass of KMnO4= 457.8

Molar mass of KMnO4= 158.034 g/mol

Number of moles of KMnO4= 457.8 g/ 158.034 g/mol= 2.9 moles of KMnO4

7) mass of erythromycin= 1.00×10^0 g

Molar mass of erythromycin= 733.93 g/mol

Number of moles of erthromycin= 1.00×10^0 g/ 733.93 g/mol = 1.36×10^-3 moles

8) mass of cortisone= 10.0 mg= 10×10^-3g

Molar mass of cortisone= 360.45 g/mol

Number of moles of cortisone= mass/molar mass= 10×10^-3 g/ 360.45 g/mol = 2.8×10^-5 moles

Answer:

this Is your communication system and Import dependency

Answer:

2H+ + 2e - ---> H2(g) is the cathode

2Cl - ---> Cl2(g) + 2e - is the anode

Explanation:

Hydrogen ion has gained two electrons, making it undergo reduction. While chlorine has lose two electrons, hence undergoing oxidation.

Answer:

No

Explanation:

It is not possible because the Black fur is the dominant gene and White fur is not therefor if both rabbits have black fur it is impossible for the offspring of the rabbits to have white fur.

Answer:

yes, the trash did disappear when she burned it however it releases smoke into the air (and harmful chemicals)

Explanation:

burning trash doesn’t only allow the waste to go down, it will also produce heat and electricity-while producing less greenhouse gas pollution than burning fossil fuels. However trash fires in burning barrels can smolder and, as a result, produce more harmful chemicals in smoke. Harmful contaminants can also be found in dirt. in conclusion, yes trash does disappear when burned but realeases many harmful chemicals.

hope this helped!

At a nuclear power plant, workers wear protective clothing and dosimeters to measure their exposure to radiation ,the nuclear fuel is held in an airtight vessel, and the reactor is covered with reinforced concrete to contain the radiation. that is in Option B.

Nuclear power plants are plants that are specially established in various countries to test nuclear weapons, with various regulations related to them, and there are many types of safety measures taken to prevent any type of harm to the person or scientists. Different nuclear weapons are tested here that give the country its power to defend itself.

Hence, at a nuclear power plant, workers wear protective clothing and dosimeters to measure their exposure to radiation ,the nuclear fuel is held in an airtight vessel, and the reactor is covered with reinforced concrete to contain the radiation. that is in Option B.

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Answer:Please find the attachment

Explanation:

Answer: Hydropower

Explanation: Hydropower is using water to power machinery or make electricity.It uses water as a fuel, water constantly moves through a vast global cycle, evaporating from lakes and oceans, forming clouds, precipitating as rain or snow, then flowing back down to the ocean.

Answer:

There is 6 ways substance can change phase. They are melting, freezing, evaporating, condensing, sublimination, and deposition.

Hope this helped

Explanation:

Answer:

The answer is H2(g) + Cl2(g) → 2HCl(g).