If element X combines with oxygen to form an ionic compound X20, what is the charge of element X?
What Group does X belong to on the Periodic Table?

Answer:

40 Grams

Explanation:

add the 28 and 12 NH6 and H2 doesn't matter for the grams because they are way way less then grams in weight

Answer:40

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Answer:

A. 0.5 mole of Ca(OH)₂.

B. 4.37 moles of H₂O.

Explanation:

The balanced equation for the reaction is given below:

CaC₂ + 2H₂O —> C₂H₂ + Ca(OH)₂

Next, we shall determine the mass of CaC₂ that reacted and the mass of C₂H₂ produced from the balanced equation. This can be obtained as follow:

Molar mass of CaC₂ = 40 + (12×2)

= 40 + 24

= 64 g/mol

Mass of CaC₂ from the balanced equation = 1 × 64 = 64 g

Molar mass of C₂H₂ = (12×2) + (2×1)

= 24 + 2

= 26 g/mol

Mass of C₂H₂ from the balanced equation = 1 × 26 = 26 g

SUMMARY:

From the balanced equation above,

64 g of CaC₂ reacted with 2 moles of H₂O to produce 26 g of C₂H₂ and 1 mole of Ca(OH)₂.

A. Determination of the number of mole of Ca(OH)₂ produced by the reaction of 32.0 g of CaC₂.

From the balanced equation above,

64 g of CaC₂ reacted to produce 1 mole of Ca(OH)₂.

Therefore, 32 g of CaC₂ will react to produce = (32 × 1)/64 = 0.5 mole of Ca(OH)₂.

Thus, 0.5 mole of Ca(OH)₂ were obtained from the reaction.

B. Determination of the number of mole of H₂O needed to produce 56.8 g C₂H₂.

From the balanced equation above,

2 moles of H₂O reacted to produce 26 g of C₂H₂.

Therefore, Xmol of H₂O will react to produce 56.8 g C₂H₂ i.e

Xmol of H₂O = (2 × 56.8)/26

Xmol of H₂O = 4.37 moles

Thus, 4.37 moles of H₂O is needed for the reaction.

The flow rate of the IV solution in drops per minute is 80 drops/min.

To determine the flow rate in drops per minute, we need to consider the conversion factors and relationships between different units.

First, let's convert the lidocaine dose from grams to milligrams, as the flow rate is given in milligrams per minute:

1 gram = 1000 milligrams

So, 1.0 gram of lidocaine is equal to 1000 milligrams.

Next, we can calculate the total volume of the IV solution in milliliters:

250 mL

To find the flow rate in milligrams per minute, we divide the dose by the total time:

Flow rate = Dose / Time

The dose is 1000 milligrams (1.0 gram) and the time is 1 minute.

Flow rate = 1000 mg / 1 min = 1000 mg/min

Now, to determine the flow rate in drops per minute, we need to convert the IV solution volume from milliliters to drops. Given that 20 drops = 1.0 mL, we can set up a conversion factor:

20 drops / 1 mL

To find the flow rate in drops per minute, we multiply the flow rate in milligrams per minute by the conversion factor:

Flow rate (drops/min) = Flow rate (mg/min) * Conversion factor

Flow rate (drops/min) = 1000 mg/min * (20 drops / 1 mL)

Now we need to convert milliliters to drops:

Flow rate (drops/min) = 1000 mg/min * (20 drops / 250 mL)

Simplifying the expression:

Flow rate (drops/min) = 1000 mg/min * (4/50)

Flow rate (drops/min) = 80 drops/min

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Answer:

To resolve this, we need to place the coefficient “2” in front of the sodium in the reactant, to give the equation shown below. 2 Na (s) + Cl 2 (g) → 2 NaCl (s) In this equation, there are two sodiums in the reactants, two sodiums in the products, two chlorines in the reactants and two chlorines in the products; the equation is now balanced.

Explanation:

A volcano can be defined as an opening on the surface of a planet that allows material warmer than surroundings to escape from its interior. Therefore, option (B) is correct.

A volcano can be described as an opening in the earth's crust through which lava, volcanic ash, and gases escape from its interior. When this material escapes, then eruptions can be calmer, with gentle flows of material, or can be explosive, sending material high into the sky.

When pieces of Earth's crust slowly move away from each other, magma can rise. The magma rises to fill in space and underwater volcanoes can form.

The tectonic plates can also move toward each other when magma rises. The part of Earth's crust can be forced deep into its interior which can cause the crust to melt and rise as magma.

The magma can also rise over hot spots. Hot spots can be defined as the hot areas inside of Earth where magma heats up and becomes less dense. With each way of rising the magma can form volcanoes.

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Answer:

P = 5.70 atm

Explanation:

Use PV = nRT

P(1.52 L) = (0.52 moles)(0.0821)(203 K)

P = 5.701628947 atm

-1113.5kJ is the theoretical enthalpy of combustion.

What makes energy different from enthalpy?

The entire amount of heat energy that is either absorbed or released in a thermodynamic system is measured by enthalpy. Internal energy denotes all of the potential or moving energy present in a thermodynamic system.

Enthalpy of combustion is the term used to describe the change in a system's enthalpy that occurs when one mole of a substance fully burns in oxygen or air at a specific temperature.

C₂H5OH()+302(g) → 2CO2(g) + 3H₂O(1)

Reactants:

5 C-H : 5*412

1 C-C : 348

1 C-O: 358

3 O=O: 3* 496

1 O-H: 463

Products:

2*2 C=O : 4*743

2*3 O-H: 6*463

Enthalpy of Vaporization (kJ mol-¹) for :

Ethanol 42.5

Water 41​

Enthalpy of combustion : (5*412 + 348 + 358 + 3* 496 + 463 + 42.5) - ( 3*41 + 4*743 + 6*463)    

                                        : -1113.5kJ

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Answer:

B) +2; 6; -2

Explanation:

In order to know what the coordination number is, all we need to do is to count the number of ligands present in the coordination sphere. Coordination number refers to the number of ligands in the coordination sphere of a given complex. The coordination number here is 6.

The counter ion here is 2Na+. It means that the overall charge on the complex must be -2 because the magnitude of charge on the complex ion is exactly balanced by the number of counter ions.

The charge on the metal (x) must now be;

x + 0 + 4(-1) = -2

x - 4 = -2

x = -2 + 4

x = +2

Note that NH3 is designated as zero because it is a neutral molecule. Each NCS^- ion has a charge magnitude of -1.

Answer:

CH3OH > CH3Cl > CH4

Explanation:

The boiling point of a compound depends on the nature and magnitude of intermolecular forces acting between its molecules.

Methanol contains the -OH group, hence hydrogen bonds are dominant intermolecular forces in the compound. Presence of hydrogen bonds increases the boiling point of a substance, hence methanol has the highest boiling point followed by chloromethane which has dipole-dipole interaction as dominant intermolecular forces and methane having only weak dispersion forces as dominant intermolecular forces.

Answer:

a. CH3NH2(aq) + H⁺ → CH3NH3⁺

Explanation:

The mixture of a weak base as CH3NH2 with its conjugate acid CH3NH3Cl produce a buffer. As the weak acid is in equilibrium with water, the mixture of the weak base and its conjugate base produce that the acid or base released react avoiding the change in pH.

For example, when a strong acid as HNO3 reacts, the weak base will react producing the conjugate base, that is:

CH3NH2(aq) + H⁺ → CH3NH3⁺

Right answer is:

Answer:

The energy of the orbitals are the same

Explanation:

For a free metal ion, all the d-orbitals are of the same energy. The five d-orbitals are said to be five fold degenerate in the free metal ion. Hence all the d-orbitals will possess the same energy irrespective of which one is first filled.

In an octahedral or tetrahedral crystal field, the d-orbitals will loose their degeneracy and become different in energy based on their orientation towards the ligands.

Answer:

ELECTROPLATING

Explanation:

In silver plating, object (iron spoon) to be electroplated is made cathode, metal to be used for coating (bar of silver metal) as anode and silver nitrate solution  as electrolyte. When current passes, positive ions moved toward the cathode and thus silver is coated to the spoon.

The process of depositing a layer of any desired metal on another material, by means of electricity is called electroplating.

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diagram

Answer:

(a) 2.273  (b) 6.07

Explanation:

We need to find the values of the given expression.

(a) (2.3) - 0.027

= 2.273

(b) (2.3)²+0.69 +0.09

=5.29 + 0.78

= 6.07

Hence, this is the required solution.

Answer:

Commercial salt is manufactured from rock salt, as well as from seawater and other natural and artificial brines.In solution mining, water is pumped into the underground rock salt deposits to create brine that is then pumped back out to the surface. The brine is then evaporated in huge evaporating vessels to make the familiar white salt. This salt can be used in industry, by food manufacturers and, of course, at the table.

NiCO3(s) + H2SO4(aq) ---> NiSO4(aq) + CO2 (g) + H2O (l). The reaction results in the formation of carbonic acid, H2CO3, which breaks down into water and carbon dioxide gas.

When magnesium carbonate and diluted sulfuric acid H2SO4 are combined, magnesium sulfate, water, and carbon dioxide gas are produced. The following is the balanced chemical equation for the reaction of magnesium carbonate with diluted sulfuric acid: MgSO4 aq + H 2 O + CO 2 g = H 2 SO4 aq.

As a result, sodium carbonate and sulfuric acid react to generate sodium sulfate, which has the chemical formula Na2SO4. Water and carbon dioxide are the other byproducts. So, in the aforementioned reaction, sodium sulfate, water, and carbon dioxide were all produced.

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Answer:H2SO4 or B

Explanation: I TOOK THE TEST  

Answer:

By using different techniques.

Explanation:

For example: Chromatography involves solvent separation on a solid medium. Distillation takes advantage of differences in boiling points. Evaporation removes a liquid from a solution to leave a solid material. Filtration separates solids of different sizes.

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Answer:

1. Chromatography involves solvent separation on a solid medium.

2. Distillation takes advantage of differences in boiling points.

3. Evaporation removes a liquid from a solution to leave a solid material.

4. Filtration separates solids of different sizes.

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Answer:

The volume of Component 1 is 36 cubic inches.

Explanation:

To calculate the volume of a composite solid, we need to determine the individual volumes of the different components and then add them together.

In this case, the composite solid consists of multiple components with the following dimensions:

Component 1:

Length: 4 inches

Width: 3 inches

Height: 3 inches

To find the volume of Component 1, we multiply the length, width, and height together:

Volume of Component 1 = Length x Width x Height = 4 in x 3 in x 3 in = 36 cubic inches

Therefore, the volume of Component 1 is 36 cubic inches.

Please provide the dimensions of the remaining components of the composite solid, and I will calculate the total volume by summing up the individual volumes.

Answer:

\(\Delta H=1149.5J\)

Explanation:

Hello!

In this case, since the calorimeter contains a solution for which the specific heat is 4.18 J/g°C, which is equal to that of the water, we can also notice that the density is 1.00 g/mL and therefore the present mass is 250 g. In such a way, we compute the enthalpy change as shown below:

\(\Delta H=mC\Delta T\)

Thus, by plugging in the mass, specific heat and temperature change, we obtain:

\(\Delta H=250g*4.18\frac{J}{g\°C}(26.1\°C-25.0\°C)\\\\\Delta H=1149.5J\)

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Answer:

b. Ar-CHCHX2

Explanation:

The hydrogen atoms when combine with carbon atoms forms the carbon hydrogen molecule. There is 1H NMR which means two hydrogen atoms are adjacent to the carbon atoms. The correct choice is b and there is one hydrogen and one carbon atoms adjacent to each other forming a molecule.

Answer:

nacl with water

they are capable of conducting electricity

The value of h in the right triangle is 7.7 cm.

Trigonometric ratio is used to show the relationship between the sides and angles of a right angled triangle.

In the right triangle, using trigonometric ratio:

a) sin(31) = h/15

⇒ 0.515 = h/15

Making H the subject of the formula we have:

0.515 x 15 = h/15  x 15

h = 7.725

h \(\approx\) 7,7

Hence, is is correct to state that the value of h in the diagram is 7.7 cm approximately. See the attached image.

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Full Question:

Although part of your question is missing, you might be referring to this full question:

the diagram shows a right-angled triangle. what is the value of h? give your answer correct to 1 decimal place.

The growth of the new plant depicts the asexual reproduction characteristic. The characteristic that describes the growth of the new plant in Stephan's mother cutting a twig from a rose bush and planting it in the soil is asexual reproduction.

Asexual reproduction is the mode of reproduction by which organisms generate offspring that are identical to the parent's without the fusion of gametes. Asexual reproduction is a type of reproduction in which the offspring is produced from a single parent.

The offspring created are clones of the parent plant, meaning they are identical to the parent.The new plant in Stephan’s mother cutting a twig from a rose bush and planting it in the soil depicts the process of asexual reproduction, which is the ability of a plant to reproduce without seeds. In asexual reproduction, plants can reproduce vegetatively by cloning themselves using their roots, bulbs, or stems.

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Answer:

100.0

Explanation:

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0.0025 moles correspond to 1.56 × 10²¹ atoms of sodium.

The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.

A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.

Given,

Atoms of sodium = 1.56 × 10²¹ atoms

we know that,

1 mole = 6.023 × 10²³ atoms

Number of moles of sodium = number of atoms ÷ 6.023 × 10²³

                                               = 1.56 × 10²¹ atoms ÷ 6.023 × 10²³

                                                = 0.0025 moles of sodium

Therefore,  0.0025 moles correspond to 1.56 × 10²¹ atoms of sodium.

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C. It becomes easier for molecules to escape.

Decreasing pressure causes a liquid to boil because it makes it simpler for molecules to escape.

Option A: Reducing the pressure does not increase the temperature or alter the liquid's volume (option B). Also, it doesn't force molecules out of the liquid (option D).

Instead, it lessens the pressure placed on the liquid's surface, which enables the liquid's molecules to more readily overcome their attraction to one another and transition into the gas phase.

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Answer:

1.75 moles

Explanation:

According to CaC₂(s) + 2 H₂O(l) --> C₂H₂(g) + Ca(OH)₂(aq)

2 moles of H20 will produce 1 mole of Ca(OH)2

therefore 3.5 moles of H2O will produce 3.5 x (1/2) = 1.75 moles of Ca(OH)2

Coenzyme q carries electrons from complex I to complex III  and complex II to complex III  in the electron-transport chain.

Coenzyme q  (CoQ), also known as ubiquinone, is the electron carrier in the electron transport system (ETS) present on the inner membrane of mitochondria.

Ubiquinone is a ubiquitous quinone, which accepts electrons from complex II ( succinate dehydrogenase) and  reduces to ubiquinol ( reduced form)

The purpose of the ETS is to generate an H+ ion concentration, by carrying electrons obtained from NADH AND \(FADH_{2}\)   produced by the Krebs cycle and glycolysis in the mitochondrial matrix. This  H+ ion potential will be used by ATP synthase to generate ATP.

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The inner mitochondrial membrane contains CoQ, a key part of the mitochondrial electron transport chain (ETC), which moves electrons from complexes I and II to complex III to provide energy for proton translocation to the intermembrane gap.

An organelle called a mitochondrion can be found in the cells of the majority of Eukaryotes, including mammals, plants, and fungi. Adenosine triphosphate, which is produced by aerobic respiration in mitochondria with their double membrane structure, is used as a source of chemical energy throughout the entire cell.

Coenzyme Q10 takes electrons from reducing equivalents produced during the metabolism of fatty acids and glucose and then transports them to electron acceptors as part of the mitochondrial electron transport chain.

Ubiquinone, also known as coenzyme Q, is a lipophilic molecule that is found in all tissues and cells and is mostly found in the inner mitochondrial membrane. It is generally known that Coenzyme Q is an essential part of the oxidative phosphorylation process in mitochondria.

Thus, The inner mitochondrial membrane contains CoQ, a key part of the mitochondrial electron transport chain (ETC).

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