5.6 dm3 of gaseous hcl (as measured in normal conditions) is dissolved in 100 cm3 of water. what is the mass percent concentration of the obtained acid? a. 2.5% b. 8.4% c. 9.1% d. 11.2% e. 16.6

Answer:

80 miles/hour

Explanation:

Distance = 400 miles

Time = 5 hours

Speed = ?

\(Speed = \frac{400}{5} \\\\Speed= 80\)

Speed= 80mi/hr

The speed of the train which travels 400 miles in 5 hours is 80 miles per hour. Speed of the train is distance covered by the train per unit time taken.

Speed of an object can be defined as the rate of change in the position or the distance of an object in any of the directions. Speed can be measured as the ratio of distance to the time taken in which the distance was covered by the train. Speed is a scalar quantity as it has only magnitude and no direction.

Speed = Distance covered by the object/ Time taken

Speed = 400 miles/ 5 hours

Speed = 80 miles/ hour

The speed of train is 80 miles per hour.

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Answer: The answer would be A.

Explanation:

Answer: B

Explanation:

Explanation:

Covalent bonds can be classified based on the number of bonds between atoms into three categories:

1. Single Covalent Bond: In a single covalent bond, two atoms share one pair of electrons. This is the most common type of covalent bond. For example, in H2O, each hydrogen atom forms a single covalent bond with the oxygen atom.

2. Double Covalent Bond: In a double covalent bond, two atoms share two pairs of electrons. This bond is stronger than a single covalent bond. For example, in O2, the oxygen atoms are connected by a double covalent bond.

3. Triple Covalent Bond: In a triple covalent bond, two atoms share three pairs of electrons. This bond is the strongest among the three types. For example, in N2, the nitrogen atoms are connected by a triple covalent bond.

It is important to note that the number of bonds between atoms is determined by the number of electrons they need to achieve a stable electron configuration, which varies depending on the elements involved.

The covalent bond is classified mainly into three types

single, double and triple bonds.

Covalent bond is a bond formed between two atoms through the sharing of two electrons between them.  The atoms will share more than one electron pairs if the valency is not satisfied.  the three types of covalent bond are single bond, double bond and triple bond.

single bond is formed when one pair of electrons are shared between atoms, while if two pairs or three pairs are shared, it is called double or triple bond respectively. Covalent compounds are those which contains covalent bonding.

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Answer:

Add Copper(II) oxide, CuO, to an aqueous solution of hydrochloric acid, HCl, to produce the salt copper chloride, CuCl2. To obtain a pure, dry sample of the salt, remove excess, undissolved CuO through filtration. Then heat the system to evaporate water, leaving behind pure Copper(II) Oxide.

The type of compound that can be made in one step from a secondary alcohol is a ketone. This is because the process of oxidizing a secondary alcohol results in the formation of a ketone.

Oxidation is a chemical reaction that involves the loss of electrons, and in the case of secondary alcohols, the loss of two electrons from the hydroxyl group (OH) results in the formation of a carbonyl group (C=O) that characterizes ketones.The reaction can be carried out by using various oxidizing agents such as chromic acid, potassium permanganate, or sodium dichromate. The choice of the oxidizing agent depends on the specific secondary alcohol being used and the desired end product. However, it is important to note that the reaction conditions need to be carefully controlled to avoid over-oxidation, which can lead to the formation of a carboxylic acid.In conclusion, a ketone can be made in one step from a secondary alcohol through oxidation. This process is commonly used in organic synthesis to create various compounds that have different applications in industries such as pharmaceuticals, perfumes, and flavors.Hi! The compound that can be made in one step from a secondary alcohol is D. a ketone. When a secondary alcohol undergoes oxidation, it is converted into a ketone.

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the Sun light from different parts of the Moon as the Moon revolves around the Earth

Answer:

sadr

Explanation:

Pls give brainlist

i tried i hope this helps hun  word “rain forest” implies that these are the some of the world’s wettest ecosystems. Rain forests generally receive very high rainfall each year, although the exact amount varies among different years and different rain forests.  For example, South America’s tropical rain forests receive between 200 and 300 centimetres (80 and 120 inches, or 6.5 to 10 feet!) of rain in a typical year. Despite relatively consistent rain in these ecosystems, there are distinct dry seasons in some rain forests. Wet and dry seasons of tropical rain forests vary in their timing, duration and severity around the globe. Tropical rain forests also have high humidity; about 88% during the wet season and approximately 77% in the dry season.

According to mole concept there are 1242.14 g  in 7.57 moles of calcium nitrate .

Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass  in grams present in one mole  of atoms is its atomic mass.

Mass of calcium nitrate is calculated from number of moles formula as, mass= number of moles ×molar mass

On substitution in above formula , mass=164.088×7.57=1242.146 g

Thus, 1242,146 g is present in 7.57 moles of calcium nitrate.

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The question is incomplete, the complete question is;

A student investigated some properties of lead and recorded the findings in the table below. Property Observation Color Dull gray Density 11.3 g/cm3 Volume of sample 3 cm3 Melting point 327°C Reaction with air Lead oxide forms on the surface Electrical conductivity Conducts some electricity Which statement is true with respect to the investigation?

A. The student investigated only the physical properties of lead.  

B. The student investigated only the chemical properties of lead.  

C. The student investigated more physical properties than chemical properties of lead.  

D. The student investigated more chemical properties than physical properties of lead.

Answer:

The student investigated more physical properties than chemical properties of lead.

Explanation:

If we look at the things mentioned in the question as regards the approach of the student towards the study of lead, we will discover that he/studied;

Colour, density, volume, melting point and electrical conductivity which are all physical properties. Physical properties of a substance does not involve chemical reactions of the substance under study.

The only chemical property studied by the student is its formation of an oxide- lead oxide with air as follows;

2Pb(s) + O₂(g) → 2PbO(s)

Thus we can safely conclude that; the student investigated more physical properties than chemical properties of lead.

Answer:

c

Explanation:

edge 2021 :)

Mg + HCl  → MgCl2 + H2. Salt and hydrogen gas are created when metal and acid combine. Magnesium produces hydrogen gas.

Thus, Salt and hydrogen gas are created when metal and acid combine. Magnesium produces hydrogen gas and magnesium chloride salt when it combines with diluted hydrochloric acid.

The gas produced by the reaction of magnesium with diluted HCl is hydrogen gas. The gas produced by the reaction of magnesium with diluted HCl is hydrogen gas.

The experiment produces very flammable hydrogen gas. No ignition source should be available to students.

Thus, Mg + HCl  → MgCl2 + H2. Salt and hydrogen gas are created when metal and acid combine. Magnesium produces hydrogen gas.

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Answer:

.

Explanation:

Answer:

The dirty dozen.

Explanation:

This is mainly seen in the control of hazardous waste and its regulations through treaty in the control of persistent organic pollutant(POPs). This regulation is seen to occur in 12 widely used persistent organic pollutants; these are seen to have the ability to absorb and store tissues that make them fatty especially in humans and also animals found in the higher trophic levels or in the food web. That being said, it can be noted that the dirty dozen can move or even attain hundreds, or thousands of levels towards the environ and also in other cases, transporting them through air or water as the case may be.

A binary covalent bond exists between 2 nonmetals.

These compounds are termed similarly to binary ionic compounds even though they don't contain ions.

These guidelines apply to the nomenclature of binary covalent compounds:

The complete name of the first element in the formula is given first.

The name of the second element refers to it as an anion.

Prefixes are employed to indicate the number of atoms in a compound. The prefix mono- is dropped if the first element only has one atom.

For instance, carbon monoxide is the name given to CO rather than monocarbon monoxide.

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It is entirely dependent on the laser power (mW). The light's divergence is affected by it.

A laser is a device that produces a powerful beam of coherent monochromatic light by stimulating the emission of photons from excited atoms or molecules.

A laser is generated when electrons in optical materials such as glass, crystal, or gas absorb energy from an electrical current or light.

We can see a 5mW 650 nm laser glowing on a white surface in full darkness from 500 to 1 kilometer away.

As a result of the divergence, the predicted dot 1 km away will be a massive dot with a diameter of 20–30 m30 m and will be exceedingly dark.

As a result, it is entirely dependent on the laser.

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a. 661.23 m/s

b.  the rate of effusion of Ammonia = 4.5 faster than Silicon tetra bromide

Given

T = 25 + 273 = 298 K

Required

a. the gas speed

b. The rate of effusion comparison

Solution

a.

Average velocities of gases can be expressed as root-mean-square averages. (V rms)  

\(\large {\boxed {\bold {v_ {rms} = \sqrt {\dfrac {3RT} {Mm}}}}\)

R = gas constant, T = temperature, Mm = molar mass of the gas particles  

From the question  

R = 8,314 J / mol K  

T = temperature  

Mm = molar mass, kg / mol  

Molar mass of Ammonia = 17 g/mol = 0.017 kg/mol

\(\tt v=\sqrt{\dfrac{3\times 8.314\times 298}{0.017} }=661.23~m/s\)

b. the effusion rates of two gases = the square root of the inverse of their molar masses:  

\(\rm \dfrac{r_1}{r_2}=\sqrt{\dfrac{M_2}{M_1} }\)

M₁ = molar mass Ammonia NH₃= 17

M₂ =  molar mass Silicon tetra bromide SiBr₄= 348

\(\rm \dfrac{r_1}{r_2}=\sqrt{\dfrac{348}{17} }=4.5\)

the rate of effusion of Ammonia = 4.5 faster than Silicon tetra bromide

If the sample of magnesium used in a lab was contaminated with another metal that doesn't react with hydrochloric acid, then the results obtained in the experiment would be affected.

This is because the data collected during the experiment would reflect the reaction between hydrochloric acid and the contaminated sample instead of pure magnesium. As a result, the following changes in results might have been observed:

1. The mass of the contaminated sample would be higher than the mass of pure magnesium.

2. The rate of reaction between the contaminated sample and hydrochloric acid would be slower than the reaction between pure magnesium and hydrochloric acid.

3. The volume of hydrogen gas collected from the reaction would be lower than the volume of hydrogen gas collected in the reaction between pure magnesium and hydrochloric acid.

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Thus, E°(cell) for the balanced redox reaction is: 1.60 V  

Any chemical process in which one or more of the involved chemical species' oxidation numbers change is known as an oxidation-reduction reaction, often known as a redox reaction. The phrase refers to a vast and diversified set of processes.

Redox reactions are those that include both oxidation and reduction. Redox reactions, like displacement reactions, occur when one species loses electrons while the other gains them (gaining electrons).

The redox reaction becomes:

PbO₂(s)+4H⁺(aq)+Sn(s) → Pb²⁺(aq)+2H₂O(l)+Sn²⁺(aq)

Thus, reduction potential values for these two half-cell reaction:

PbO₂(s)+4H⁺(aq)+ 2e⁻ → Pb²⁺(aq)+2H₂O(l),     E⁰ = 1.46 V

Sn²⁺(aq) + 2e⁻ → Sn(s),           E⁰ = -0.14 V    

EMF = E(cathode) - E(anode)

or, EMF = 1.46 V - (-0.14 V)

or, EMF = 1.60 V.

Thus, E°(cell) for the balanced redox reaction is: 1.60 V  

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Hello! :)

Noble gases are located in group 8A in the periodic table.

Elements in this group contain 8 valence electrons, making them very stable elements. Some examples of elements in this group include Neon, Argon, and Krypton.

Explanation:

Density is an intensive property of any matter. Any given pure sample of a substance will have the same density value.

Density is the mass per unit volume of a compound;

  Mathematically;

    D = \(\frac{M}{V}\)  

where M is the mass

          V is the volume

          D is the density

Factors that determine ionization energy:

Factors that determine atomic volume:

Best of Luck!

The order of solubility from most to least can be given as carbonate>sulfate>iodate>chloride. Carbonates are the most soluble.

The maximum amount of a material that may dissolve in another is known as its solubility. A saturated solution is created when a solvent can dissolve its maximum quantity of solute before reaching equilibrium. A supersaturated solution results when extra solutes are dissolved past its equilibrium solubility point under specific circumstances.

Dissolution is the action of disintegrating. In contrast to the speed of solution, which specifies how rapidly a molecule dissolves in a solvent, solubility is not a feature of matter. The order of solubility from most to least can be given as carbonate>sulfate>iodate>chloride.

Therefore,  the order of solubility from most to least can be given as carbonate>sulfate>iodate>chloride.

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Answer:

C. solid iodine subliming into a gas

Explanation:

A physical change is a change that is reversible and can be reversed back into the original product. The atoms and molecules undergoes some rearrangement in the physical change. The process of change in the state of matters are placed under physical change. Solid iodine sublimes into purple gas on heating. The gas is then changed back to iodine crystals after being cooled. Hence, this is an example of a physical change.

Answer:

A. All of these.

Explanation:

Raw sewage can cause diseases to easily transmit, nitrate and phosphate increases, and high BOD.

Atoms having greatly differing electronegativities are expected to form ionic bonds. Electronegativity is the measure of an atom's ability to attract electrons towards itself in a chemical bond.

When two atoms have a large difference in electronegativity, one atom will attract electrons more strongly than the other. This results in the transfer of electrons from one atom to the other, leading to the formation of ions with opposite charges. These oppositely charged ions attract each other and form an ionic bond. Therefore, option D, ionic bonds, is the correct answer.

Atoms having greatly differing electronegativities are expected to form ionic bonds (option D). When there is a large difference in electronegativity, one atom will attract the shared electrons more strongly, causing a transfer of electrons from the less electronegative atom to the more electronegative one. This results in the formation of positive and negative ions, which are then held together by electrostatic forces, forming an ionic bond.

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The solubility at 25 °C of Ni(OH)₂ in pure water and in a 0.0190 M NaOH solution is 1.28 × 10⁻⁵ M.

According to the given information, Ksp for Ni(OH)₂ = 5.84 × 10⁻¹⁶ at 25°C. The solubility of Ni(OH)₂ can be determined by using the following formula:

Ksp = [Ni²⁺] [OH⁻]²

For this, we will assume that 'x' moles of Ni(OH)₂ will dissolve in water, which will dissociate into 'x' moles of Ni²⁺ and 2x moles of OH⁻.

Ksp = [Ni²⁺] [OH⁻]²

5.84 × 10⁻¹⁶ = (x) (2x)²

4x³ = 5.84 × 10⁻¹⁶

x³ = 1.46 × 10⁻¹⁷

x = 1.28 × 10⁻⁵ moles/L

Thus, the solubility of Ni(OH)₂ in pure water is 1.28 × 10⁻⁵ M at 25°C.

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Answer: I remember looking out of the car as we pulled up to the Frantz school.”

“I thought maybe it was Mardi Gras.”

“As we walked through the crowd, I didn’t see any faces.”

“[The school] looked bigger and nicer than my old school.”

“The crowd behind us made me think this was an important place.”

“It must be college, I thought to myself.

Explanation:

“I thought maybe it was Mardi Gras.”

“[The school] looked bigger and nicer than my old school.”

“It must be college, I thought to myself.”

Answer:

Hey there!

Four things increasing temperature:

Cars, Busses, Motorcycles

Greenhouse Gases

Factories

Non-renewable energy sources

Four things we can do:

Ride a bike instead of a car

Try using solar panels, and wind energy

Turn off lights when leaving a room

Try reusing and recycling.

Let me know if this helps :)

Answer:

4.81 * 10^24

Explanation:

we know that:

no. of atoms = moles * avogadro number

no. of moles = 8 * 6.022* 10^23

no. of moles = 4.81 * 10^24