Select the structure that correspondsto the molecule name:ethylmethylamineA.NHB. CH3CH₂NHCH3C. both

A sheet of gold weighing 10.7 g and at a temperature of 19.8 °C is placed flat on a sheet of iron weighing 18.7 g and at a temperature of 53.3 °C. the final temperature of the combined metals is 48.87 °C.

given that :

weight of gold , m= 10.7 g

temperature, T = 19.8 °C

weight of iron , m = 18.7 g

temperature, T = 53.3 °C

final temperature t = ?

specific heat for gold , c = 0.12 J/ g °C

specific heat for iron , c =  0.45 J/ g °C

now, using the specific heat formula we get :

( mc ΔT ) + ( mc ΔT ) = 0

( 10.7 × 0.12 ×( t - 19.8 )  +  ( 18.7 × 0.45 × (t - 53.3 ) = 0

(1.28 t - 25.4) + ( 8.41 t - 448.2 ) = 0

9.69 t = 473.6

t = 48.87 °C

Thus, A sheet of gold weighing 10.7 g and at a temperature of 19.8 °C is placed flat on a sheet of iron weighing 18.7 g and at a temperature of 53.3 °C. the final temperature of the combined metals is 48.87 °C.

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The group of organic substances known as organic carbonic acids includes zinc carbonate. Compounds with the carbonic acid functional group are known as organic carbonic acids. Zinc carbonate is a substance with a very low acidity

An odourless, white, sand-like substance known as zinc carbonate. Cosmetics, lotions, ceramics, pottery, rubber, feed additives, and medications all use it.

Zinc (Zn), carbon (C), and oxygen make up the inorganic compound known as zinc carbonate (O). ZnCO3 is its chemical composition. Oxygen is -2, carbon is +4, and zinc has an oxidation state of +2.

With the chemical formula ZnCO3, zinc carbonate is a white, insoluble zinc salt. By reacting with the proper amounts of sulphate, it can be used to create the majority of straightforward zinc salts. Smithsonite, also known as zinc spar, is a mineral that contains zinc carbonate.

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Here, there are 2 conditions of the gas here.

The next equation is used: (1)

Data: conditions 1

P1 = pressure, in mmHg = 571.6 mmHg

T1 = temperature, in K = 25 °C + 273 = 298 K

V1 = 2,275 mL

-------------

Data: conditions 2

P2 = needs to be calculated

T2 = 175 °C + 273 = 448 K

V2 = 1,255 mL

--------------

From (1), P2 is cleared:

(P1 x V1/T1) x T2/V2 = P2

(571.6 mmHg x 2,275 mL/298 K) x (448 K/1,255 mL) = P2

1558 mmHg = P2

Answer: P2 = 1558 mmHg

The heat absorbed or released by a substance is given by the following formula:

Where Q is the heat absorbed or released, m is the mass of the substance, Cp is the specific heat, T2 is the final temperature and T1 is the initial one.

We know the values of Q, m, T2 and T1 because they are given by the question statement, and we have to find the value of Cp.

Solve the equation for Cp and use the given values to find its value:

The specific heat of the substance is 0.49J/g°C.

Sulphur has a larger atomic radius than chlorine, even though chlorine has more protons, neutrons and electrons because sulfur is to the left of chlorine in the periodic table.

Atomic radius is defined as the distance between the atomic nucleus of an atom to the electron which is located at the outermost shell of the atom.

In the periodic table, the elements are being arranged in groups and periods with respect to their various atomic mass and numbers.

The atomic radius decreases across the period but increases down the group of the periodic table.

Therefore, sulphur would probably have a larger atomic radius when compared with chloride because it is located to the left of chloride in the periodic table.

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The chemical equation will be written as:

2C2H6 + 7O2    → 6H2O + 4CO2

Therefore,

The chemical equation will be written as:

2C2H6 + 7O2    → 6H2O + 4CO2

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Common use for a type of electromagnetic radiation is Thermal imaging uses infrared waves.

When magnetic field comes in contact with electric field than electromagnetic radiations are formed. The magnetic field and the electric field are perpendicular to each other. types of electromagnetic waves are : Radio waves, Microwaves, Infrared waves, Visible light , Ultraviolet waves, X- rays , gamma rays.

A tanning bed uses the  ultraviolet waves

water purification uses the UV waves

Thermal imaging uses the infrared waves

weather radar use the Radio waves

Thus, Common use for a type of electromagnetic radiation is the Thermal imaging uses infrared waves.

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The final pressure of a sample of gas held in a container with a volume of 6.02 L and a temperature of 59.5℃ is 0.26atm.

The pressure of a given gas can be calculated using Boyle's law equation as follows:

P₁V₁ = P₂V₂

Where;

According to this question, a given sample of gas is held in a container with the volume of 6.02 L with a temperature of 59.5℃ at a pressure of 1.20 atm. The final pressure can be calculated as follows;

At STP;

1.2 × 6.02/332.5 = P × 22.4/273

0.0217 = 0.082P

P = 0.26atm

Therefore, 0.26atm is the final pressure of the gas.

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A coefficient of 2 has been put in front of Na₃PO₄, so to balance Na coefficient in front of NaCl will be 6.

The balanced equation of the reaction is -

2 Na₃PO₄ + 3 MgCl₂ → Mg₃(PO₄)₂ + 6 NaCl

This is a complete balance chemical equation of the given reaction with coefficient 6 in front of NaCl to balance Na.

Here,

We've been given a chemical equation which is unbalanced. A coefficient of 2 has been put in front of Na₃PO₄ and we are asked about what coefficient should go in front of NaCl so that the sodium Na is balanced. Since, there were total 3 Na before the coefficient was placed, but after putting the coefficient of 2, Na is 2 x 3, which is 6.

Therefore, an integer 6 is to be put in front of NaCl to balance Na in the equation.

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Answer: 4

Explanation:

The temperature should be between 30 °F and 60 °F because the temperature outside is 39 °F, so the water in the pond should have a temperature range that includes this temperature.

Therefore, the answer is B.

Answer:

b. Double displacement.

Explanation:

It is a double displacement reaction, because in this case, hydrogen atom in HBr is replaced by a sodium atom (from NaOH), and the sodium atom (in NaOH) is replaced by another H atom from HBr molecule, to form H2O.

The effect of acid you think is most important because chemical that can donate a hydrogen ion to other molecule

Acid is an that in water solution taste sour and changes blue litmus to red and react to some metal to liberate hydrogen react with bases to form salt and and also promote chemical reaction and the effect of acid is the chemical that can donate hydrogen ion to other molecule and the result in other molecule changing shape and possibly breaking apart

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ANSWER

STEP-BY-STEP EXPLANATION

Combination (also called synthesis): Where two elements or one compound and one element will bond and form a new compound as a product, the representation for this reaction is:

A + B -> AB

The only option that follows this description of Combination reaction is the first reaction:

N2 + O2 -> 2 NO

Answer:

False. F-F would be a covalent apolar molecule.

Explanation:

As we have two elements bonded of the same element, in this case, F (fluorine), they would be sharing electrons, making that the bonding is covalent but there are no charges, because they're the same element, so it would be a completely covalent apolar molecule.

1)Isotopes of certain radioactive elements that spontaneously emit radiation and rays from the nuclei.

2)In a nuclear fusion reaction, two small, light 'nuclei' (hydrogen atoms) combine under extreme 'temperature' and pressure to form one larger, heavier nucleus (helium).

The Sun and other stars are powered by nuclear fusion reactions. A heavier nucleus is created when two light nuclei fuse together in such a fusion reaction. So because mass of the emerging single nucleus is smaller than that of the combined mass of the two initial nuclei, the process generates electricity. Remaining mass is converted to energy.

Normal electrostatic forces between positively charged nuclei prohibit them from coming close enough to smash and allow fusion to occur, hence fusion is not feasible.

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Answer:

288 g.

Explanation:

Measurements => Density.

Density is the ratio of the mass of an object to its volume:

where D is density, m is mass, and V is volume.

We have two data: the volume (32.1 mL) and the density (8.96 g/mL) and we need to find the mass.

We can solve for 'm' in the given equation and replace the given data, as follows:

The answer would be that the mass is 288 g.

Answer:

what is this free

branliest?

Answer:

Explanation:

Here, we want to get the number of moles present in the solution

Mathematically:

From the question:

We have the molarity as 1.5 M

We have the volume as 2.0 L

Thus, we have the number of moles as:

The maximum length of gold foil could be 1171.7 cm made from 1.10 x 10³ g of gold.

The density of an object can be described as the mass per unit volume. The average density is equal to the total mass divided by its total volume.

The mathematical formula of the density of the material can be expressed as follows:

Density = Mass/Volume

The density of a substance is an intrinsic property as it doesn't depend on its size and the S.I. unit of the density is Kg/m³.

Given the width of the gold foil, w = 304 mm = 30.4 cm

The height or thickness of the foil, h = 0.016 mm = 0.0016 cm

The density of the gold foil, d = 19.3 g/cm³

The mass of the gold given, m = 1100 g

The volume of the foil = m/d = 1100/ 19.3 = 56.99 g/cm³

As we know that the volume of  gold foil , V = l × w × h

l = V/(w × h)

l = 56.99/(30.4 × 0.0016)

l =1171.7 cm

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Answer:

Explanation:

C

Answer:

I think the answer to your question is option A.

Taking into account the definition of enthalpy of a chemical reaction, 2.345 moles of CH₃OH are required to give off 1501 kJ of heat

The enthalpy of a chemical reaction as the heat absorbed or released in a chemical reaction when chemicals are transformed into a chemical reaction at constant pressure.

The enthalpy is an extensive property, that is, it depends on the amount of matter present.

In this case, the balanced reaction is:

2 CH₃OH (l) + 3 O₂ (g) → 2 CO₂ (g) + 4 H₂O(g)

and the enthalpy reaction ∆H° has a value of -1280 kJ/mol.

This equation indicates that when 2 moles of CH₃OH reacts with 3 moles of O₂, 1280 kJ of heat is released.

If it is required to give off 1501 kJ of heat, you can apply the following rule of three: If 1280 kJ of heat is released by 2 moles of CH₃OH, 1501 kJ of heat is released by how many moles of CH₃OH?

amount of moles= (1501 kJ× 2 moles of CH₃OH)÷ 1280 kJ

amount of moles= 2.345 moles of CH₃OH

In summary, the amount of moles required are 2.345 moles.

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Answer: the second one

Explanation:

Answer:

there's no answer choices?

Promethium is the 61st element that you can find in the periodic table and the number 147 indicates the atomic mass.

Remember that the atomic number (in this case, 61) represents the number of protons, so there are 61 protons in Pm-147.

And to find the number of neutrons, we have to subtract the atomic number (61) from the atomic mass (147):

So, the final answer is that we have 61 protons and 86 neutrons of Pm-147.

Answer: For example, Christmas lights transform electrical energy into thermal energy and light energy.

Explanation: so it either thermal or light, most likely light.

When copper carbonate disolves the following happens:

The formula for the solubility product constant is:

As for every copper ion in solution there is one carbonate ion, we know that the concentration of both ions in solution is 0.57mol/l.

Now we calculate the constant:

So the answer is Ksp= 0.3249 mol2/L2

A. r: distance

B. q: charge

C. Fe: electric force

D. E: Electric field

So the answer is option C.

17.05 L of O₂ are needed to react with 6.82 L of acetylene gas C₂H₂ at STP.

The reaction to the given question is :

2 C₂H₂ + 5 O₂ → 4 CO₂ + 2 H₂O

From the equation we see

2 moles of C₂H₂ react with 5 moles of O₂

According to the equation,

        2 liters of Acetylene reacts with  =  5 liters of O₂

So,

             6.82 L Acetylene will produce  =  X L of O₂

Solving for X,

                         X  =  ( 6.82 L × 5 L ) ÷ 2 L

                         X  =  17.05 L of O₂

Thus, 17.05 L of O₂ is needed to react with 6.82 L of acetylene gas C₂H₂.

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Answer

V2 = 1466.7 mL

Explanation

Given:

Volume 1 = 200 mL

Pressure 1 = 330.0 kPa

Pressure 2 = 45.0 kPa

Required: Volume 2

Solution:

To solve this problem we will use Boyles law

P1V1 = P2V2

V2 = P1V1/P2

V2 = (330.0 kPa x 200 mL)/45.0 kPa

V2 = 1466.7 mL