what is 3.8 times 3.8

Answer: 13.5 minutes to run 3.2 km.

Explanation: To solve this problem, you need to convert the distance from kilometers to miles and the speed from miles per hour to kilometers per hour. 3.2 km is approximately 1.988 miles and 5.5 mph is approximately 8.851 kph. To find the time it takes to run 1.988 miles at 8.851 kph, you can use the formula time = distance ÷ speed. Plugging in the values, you get time = 1.988 miles ÷ 8.851 kph, which simplifies to approximately 0.225 hours or 13.5 minutes.

Therefore, it will take the student approximately 13.5 minutes to run 3.2 km.

If we add more magnesium to the reaction, the reaction speed will increase.

The chemical reaction shown is a single-displacement reaction, also known as a single-replacement reaction. In this type of reaction, one element replaces another element in a molecule, producing a new compound and a different element.

In the given reaction, magnesium (Mg) reacts with sulfuric acid (H₂SO₄) to produce magnesium sulphate (MgSO₄) and hydrogen gas (H₂). This can be represented by the following balanced chemical equation:

Mg + H₂SO₄ → MgSO₄ + H₂

This is because the amount of reactant determines the number of reactions that can occur. If the amount of magnesium is increased, more magnesium atoms are available for the reaction with sulfuric acid, leading to a higher rate of reaction.

However, this increase in reaction rate is only valid up to a certain point, after which further addition of magnesium will not lead to an increase in rate of reaction. This is because other factors such as the concentration of sulfuric acid and the temperature of the reaction may become limiting factors that can no longer be compensated by adding more magnesium.

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Explanation:

Unsaturated hydrocarbons have one or more double or triple bonds between carbon atoms. Those with double bond are called alkenes and those with one double bond have the formula CnH2n (assuming non-cyclic structures). ... Alkanes have the general formula CnH2n+2.

Answer:

If more than one double bond is present, indicate their position by using the number of the first carbon of each double bond and use the suffix -diene (for 2 double bonds), -triene (for 3 double bonds), -tetraene (for 4 double bonds), etc.

Explanation:

The increasing order of the crystal field splitting- I− < Br− < S2− < SCN− < Cl−< N3 < F−< NCO−< OH−<C2O42−< O2−< H2O < acac− < NCS− < CH3CN <gly <py < NH3 < en  < bipy  < phen  < NO2−  < PPh3 < CN− < CO.

The ligands (affections to a metal ion) are listed in the spectrochemical series according to the strength of their field. The series was created by superimposing various sequences acquired from spectroscopic research because it is impossible to generate the full series by examining complexes with the single metal ion.

The ligands cyanide and CO are classified as strong-field ligands, whereas the halides are weak-field ligands. Ligands such as water and ammonia are said to create medium field effects.

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The enthalpy of this reaction is 1.48 kJ/mol.

The formula to calculate heat energy is

Q = m × c × ΔT

ΔT = T₂ - T₁

ΔT = T₂ - T₁ = 24.70 - 21.00 = 3.70 °C

Q = m × c × ΔT

Q = 191 × 4.184 × 3.70

Q = 2,956.83 J

Q = (2,956.83 ÷ 1,000) kJ

Q = 2.96 kJ

The enthalpy ΔH = Q ÷ n

ΔH = Q ÷ n

ΔH = 2.96 ÷ 2.00

ΔH = 1.48 kJ/mol

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Answer:

310 mmHg

Explanation:

All you have to do here in order to figure out the pressure exerted by gas  

D  is use Dalton's Law of Partial Pressures.

The moles of ammonium phosphate produced by the reaction of 0. 085 mol of ammonia is 0.042 moles

The balanced chemical equation for the reaction between phosphoric acid and liquid ammonia to produce ammonium phosphate is:

2NH₃ + H₃PO₄ → (NH₄)₂HPO₄

From the balanced equation, we can see that 2 moles of ammonia react with 1 mole of phosphoric acid to produce 1 mole of ammonium phosphate.

To find the moles of ammonium phosphate produced from 0.085 moles of ammonia, we can use the mole ratio from the balanced equation:

(0.085 moles NH₃) × (1 mole (NH₄)₂HPO₄ / 2 moles NH₃) = 0.0425 moles (NH₄)₂HPO₄

Therefore, the moles of ammonium phosphate produced by the reaction of 0.085 moles of ammonia is 0.0425 moles. The answer should be rounded to the correct number of significant digits, which is 2, since the given value of ammonia has 2 significant digits.

The final answer is 0.042 moles of ammonium phosphate.

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Answer:

Explanation:

These different types of solids have different properties that depend on the particles ... C4.3i, Explain why ionic solids have higher melting points than covalent solids. ... of each of the six compounds, predict from the Periodic Table which should be ionic ... Check each of six compounds – NaCl, sugar, KCl, KI, camphor, and.

There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, the correct option is option D.

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.

The compound that is ionic in nature can be dissociated very easily in water. Since ionic compounds are polar in nature, they readily dissolve in water. Among given option sugar is having the lowest melting point as it is covalent compound.

Therefore, the correct option is option D.

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The hybridization state around the sulfur atom is sp2. The molecular geometry is bent/angular, and the approximate bond angle around the sulfur atom is 120°,SO2.

What is the molecular ?

Molecular is a term used to describe the smallest particle of a substance that still has all the properties of that substance. It is made up of atoms, which are the building blocks of all matter. Atoms can bond together to form molecules, which are the smallest units of a chemical compound. Molecules are the basic units of all matter, and they can exist in different forms, such as solid, liquid, and gas. The structure of a molecule can be determined through various methods, such as spectroscopy and X-ray crystallography. By studying the molecular structure of a compound, scientists can better understand its properties and how it behaves in different situations.

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Answer:

b or c

Explanation:

Answer:

The correct answer is Option C (E1) and Option B (carbocation).

Explanation:

Some other possibilities offered aren't relevant to the procedure outlined. So the above alternative is accurate.

Answer:

IM VERY SORRY HAVE A GOOD DAY\\

Explanation:

Answer:

To separate a metal from its ore using acid and preserving desirable products such as gold.

Explanation:

please make brainiest

Answer:

true

Explanation:

the way the place grew back to life my g

Answer:

True

Explanation:

Secondary succession is when a terrain grows again after it's been destroyed.

Answer:

There are 10.0 moles of beryllium oxide in a 250 grams sample of the compound.

Explanation:

We can calculate the number of moles (η) of BeO as follows:

\( \eta = \frac{m}{M} \)

Where:

m: is the mass = 250 g

M: is the molar mass = 25.0116 g/mol

Hence, the number of moles is:

\( \eta = \frac{250 g}{25.0116 g/mol} = 10.0 moles \)

Therefore, there are 10.0 moles of beryllium oxide in a 250 grams sample of the compound.  

I hope it helps you!

Answer:

Empirical evidence for a proposition is evidence, i.e. what supports or counters this proposition, that is constituted by or accessible to sense experience or experimental procedure. Empirical evidence is of central importance to the sciences and plays a role in various other fields, like epistemology and law.

Explanation:

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Answer:

1. Elements

2. one

3. properties

4. Chemical

5. metal

6. non-metal

7. metalloids

8. Compounds

9. one

10. more

11. components

12. chemical process

Explanation:

In the given paragraph a brief about the difference between element and compound is given.

Elements are made up of the same type of atoms and each element is made up of one atom, that is they cannot be broken down into any other substance. Each element is different from each other due to its properties, though some have the same physical properties but are different in chemical properties.  Elements can be classified as metals such as iron and silver, non-metals such as oxygen and hydrogen, and metalloids such as boron and silicon.

Compounds are a combination of one or more elements such as water and salt. Compounds can be easily broken down into components through a chemical process.

Hence, the correct answer is:

1. Elements

2. one

3. properties

4. Chemical

5. metal

6. non-metal

7. metalloids

8. Compounds

9. one

10. more

11. components

12. chemical process

Answer: 78.59 lb/ft

Explanation:

use stoichiometry to solve

1.26g/cm x ( 1pound/ 454 grams) X (28317 Cm/1 ft) =  78.59 pounds/ft

Answer:

Titanium.

Explanation:

Hello,

In this case, since chromium has 24 electrons (atomic number) in order to represent the electron configuration of Cr⁺² which means that it has lost two electrons in order to get positively charged, we must perform an electron configuration until 22 (24-2) as follows:

\(Cr^{+2}:1s^2,2s^2,2p^6,3s^3,3p^6,4s^2,3d^2\)

In such a way, adding the electrons per sublevel and shell we count 22, which matches with the number of electrons of titanium and therefore with its very same electron configuration.

Best regards.

A substance's mass is a measure of its amount of matter. Volume is a unit used to describe how much space an object occupies. A volume's density tells us how much matter there is in that space.

Fundamental physical measurements of a thing, such as its mass, volume, and density, can provide important clues about its make-up and condition.

The amount of volume or space that makes up an object or substance is measured by its density. How does density affect each and every part of our existence, then? Gold mining, blood separation, strawberry DNA extraction, and even stacked buildings all depend on density (like the one you see here).

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Taking into account the definition of sensible heat, the mass of copper in the sample is 277.06 grams.

When heat added or removed from a substance causes a temperature change in it without affecting its molecular structure (physical state), it is called sensible heat.

The expression that allows to calculate heat exchanges is:

Q = c× m× ΔT

where:

In this case, you know:

Replacing in the definition of sensible heat:

1600 J = 0.385 J/gC× m× 15 C

Solving:

1600 J = 5.775 J/g× m

1600 J÷ 5.775 J/g= m

277.06 g= m

Finally, the mass of copper in this case is 277.06 grams.

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Answer:

C) Both will require the same amount because the concentrations are equal.

Explanation:

The pH of a solution is defined as:

pH = -log [H+]

This H+ is the ion that reacts with OH- (From NaOH) as follows:

H+ + OH- → H2O

When all H+ reacts, we can say the solution was neutralized.

Now, as both, the solution with the weak acid and the solution with strong acid have the same pH, we can say that their [H+] is the same. Assuming the volume of both solutions is the same:

Both will require the same amount because the concentrations are equal.

The amount of heat required to convert 5.6 g of the compound from a liquid at 30.0 °C to a gas at 60.5 °C is approximately 1.183 kJ.

To calculate the amount of heat required to convert 5.6 g of the compound from a liquid at 30.0 °C to a gas at 60.5 °C, we need to consider the heat required for temperature change and the heat of vaporization.

First, let's calculate the heat required for the temperature change from 30.0 °C to the boiling point of 47.6 °C in the liquid state:

q1 = mass * specific heat * temperature change

= 5.6 g * 0.91 J/g-K * (47.6 °C - 30.0 °C)

= 81.23 J

Next, let's calculate the heat required for the phase change from liquid to gas:

q2 = heat of vaporization * number of moles

= 27.5 kJ/mol * (5.6 g / molar mass)

= 27.5 kJ/mol * (5.6 g / 146.39 g/mol)

= 1.051 kJ

Finally, let's calculate the heat required for the temperature change from the boiling point to 60.5 °C in the gas state:

q3 = mass * specific heat * temperature change

= 5.6 g * 0.67 J/g-K * (60.5 °C - 47.6 °C)

= 51.02 J

The total amount of heat required is the sum of q1, q2, and q3:

q_total = q1 + q2 + q3

= 81.23 J + 1.051 kJ + 51.02 J

= 1.132 kJ + 51.02 J

= 1.183 kJ

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The pH of the solution decreases by adding water to each substance.

pH is the negative logarithm to base ten of the hydrogen ions concentration of a solution.

A low pH means a high hydrogen ions concentration.

If the hydrogen ions concentration decreases, the pH will increase.

Therefore, the pH of the solution decreases by adding water to each substance.

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The atoms have different types of bonds holding molecules together and leads to evaporation.

Thus, A crucial stage in the Earth's water cycle is evaporation, which is the process by which water transforms from a liquid to a gas or vapor. Evaporation at the molecular level requires the interface to break at least one extremely strong intermolecular connection between two water molecules.

The chemical mechanism by which an evaporating water molecule acquires sufficient energy to escape from the surface has remained mysterious despite the significance of this activity.

Here, we demonstrate that the high kinetic energy of the evaporated water molecule is enabled by a precisely timed formation and dissolution of hydrogen bonds involving at least three water molecules at the interface, the recoil of which allows one water molecule to escape.

Thus, The atoms have different types of bonds holding molecules together and leads to evaporation.

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The result of the Heat Transfer experiment is given as follows:  "The molecule was increased in kinetic energy but in a random structure." (Option B)

Heat transfer is a thermal engineering subject that deals with the creation, consumption, conversion, and exchange of thermal energy across physical systems.

Heat transmission is categorized into several methods, including thermal conduction, thermal convection, thermal radiation, and energy transfer via phase shifts.

At 3 p.m., the water temperature is raised. The average kinetic energy of an item is related to its temperature. As a result, as temperature rises, so does average kinetic energy.

Kinetic energy is created by the random movement of molecules. Hence, the correct answer is "The molecule was increased in kinetic energy but in a random structure."

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Full Question:

A student investigated heat transfer using a bottle of water. The student placed the bottle in a room at  20.50C. The student measured the temperature of the water in the bottle at 7 a.m. and again at 3 p.m.  The data from the investigation are shown in the table below.

[See attached image]

Question:How would you describe the average kinetic energy of the water molecules in the bottle at 7 a.m. to  the average kinetic energy of the water molecules in the bottle at 3 p.m.

The amount, in mL, of the suspension that should be given to an infant weighing 17 lb will be 1.16 mL

0.8 mL of the liquid contains 80.0 mg of the drug.

The recommended dose is 15 mg per kg of body weight

The infant to be given the drug weighs 17 lb.

First, let's convert the weight of the infant to kg.

1 lb = 453.59 g

17 lb =       453.59 x 17/1

                   = 7711.03 g

1000 g = 1 kg

7711.03 g = 7711.03 x 1/1000

               = 7.711 kg

So, the baby's weight is 7.711 kg.

The drug dose for the baby can thus be calculated as:

15 mg x 7.711 = 115.67 mg

But 0.8 mL of the drug contains only 80.0 mg. How many mL will contain 115.67 mg?

                   0.8 x 115.67/ 80.0 = 1.16 mL

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By a redox reaction that involves the transfer of electrons, often through the dissolution of an ionic substance, electrochemical cells produce electricity from the flow of electrons.

In electrochemistry, redox or oxidation-reduction reactions, in which electrons travel from one element to another, can produce electricity. Redox processes involve the transfer of electrons from one substance to another.

Batteries use a very significant class of oxidation and reduction reactions to produce useable electrical energy. Using solutions of respective sulphates, copper and zinc metals can be combined to create a straightforward electrochemical cell.

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