In the following acid-base reaction,
HPO42- is the
H2PO4- (aq) + NH3(aq) → HPO42- (aq) + NH4+(aq)
А
B
С
acid
conjugate
acid
conjugate
base

Answer: a

Explanation:

Industry uses only about 18% while the others use around 70-90% of water.

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The use of the pH scale and litmus paper are the ways which can determine whether the solution is an acid or base.

The pH scale is the way which determine the acidic or basic nature of a solution. If the pH of a solution is less than 7, it is considered as acidic. If the pH is 7, the solution is neutral and if the pH is greater than 7,the solution is basic.

While on the other hand, litmus paper also tells us about acidic and basic nature of solution. if the litmus paper turns red, it means the solution is acidic whereas if the litmus paper turns blue it means basic.

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Answer:

monkey see, monkey do

Explanation:

boom :)

Answer:

I think it's a game with me and I will knock out a bit and I hope you are u all the way you can get a little bit of a good time to come over here in a bit of the world

Answer:

More common near convergent boundaries

Explosive Eruptions

Low Viscosity Magma

Explanation:

Hot spots like hawaii are better known for shield volcanoes. The magma is high viscosity which causes them to build pressure before erupting, leading to explosive eruptions.

Answer:

Humans get muscle cramps when they start sport movemement wih out training and there is a store of calorie and amino acids so when it heated fastly there were some disease like muscle cramps

Answer : 12

It has a +2

Take it out from 14

The ideal gas equation can be used to obtain the pressure, number of moles, volume and temperature of a gas.

The ideal gas equation gives the relationship between pressure, number of moles, volume and temperature.

To obtain the number of moles of PH3

PV = nRT

n = PV/RT

n = 0.80 atm * 1.50 L/0.082 atmL/Kmol * 298 K

n = 0.049 moles

Number of moles of O2

PV = nRT

n = PV/RT

n = 0.100 atm *  2.28L /0.082 atmL/Kmol * 293 K

n = 0.0095 moles

Fom the reaction equation;

4 moles of PH3 reacts with 8 moles of O2

0.049 moles of PH3 reacts with  0.049 moles * 8/4 moles

= 0.098

Hence O2 is the limiting reacatant.

Mass of P4O10 produced =

8 moles of O2 yields 1 mole of P4O10

0.0095 moles  of O2 yields 0.0095 moles  * 1 mole/8 moles

= 0.0012 moles

Mass of P4O10  = 0.0012 moles * 284 = 0.34 g

Mass of water;

8 moles of O2 yields 6mole of water

0.0095 moles  of O2 yields 0.0095 moles * 6 moles/8 moles

=0.0071 moles

Mass of water = 0.0071 moles * 18 g/mol = 0.13 g

Since 4 moles of PH3 reacts with 8 moles of O2

x moles of PH3 reacts with 0.0095 moles  of O2

x = 0.0048 moles

Moles of PH3 left over = 0.049 moles - 0.0048 moles = 0.0442 moles

Mass of PH3 left over = 0.0442 moles * 34 g/mol

= 1.5 g

No mass of O2 is left over because the limiting reactant is used up.

Total moles of gas left after the reaction = 0.0442 moles +  0.0071 moles = 0.0513 moles

P = nRT/V

P = 0.0513 moles * 0.082 atmL/Kmol * 295.5/3.88L

P= 0.32 atm'

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Answer:

Vinegar

Explanation:

What liquid makes metal rust the fastest? Vinegar speeds up rusting because it contains a dilute form of acetic acid; positive hydrogen ions in the acid remove electrons from iron, ionizing it and making it susceptible to rust. How do you rust metal quickly?

Answer:

iron, especially if it is exposed to water and oxygen

Example:-

We cannot pull back the reaction to get wax back .

Answer:

Explanation:

The permanent change in which a new substance is formed is called a chemical reaction.

For example:

i)Burning of wood

ii)Cooking rice

iii)Forming curd from milk

The burning of wood is a chemical reaction because it is a permanent change and it cannot be reversed. Once it is done, it is over it can't be done again. And in the case of example iii, the milk turns into curd by chemical reaction. A new substance i.e curd is formed from the milk.

Hope you understood!

Answer: Iron

Explanation: There are little minnerals that make it magnetic.

The statement, that describes separation technique would most likely be used if a solvent were saved is "distillation separation."

Separation techniques are methods for separating two different states of matter, such as liquid and solid. Methods that employ variations in physical qualities to separate the components of a mixture, such as evaporation, distillation, filtration, and chromatography, can be used to physically separate the components of a mixture.

Simple distillation is a technique for removing a solvent from a solution. Water, for example, can be extracted from salt solution by simple distillation. If a solvent was saved, the separation procedure would most likely be used is distillation.

Hence the correct option is B.

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Answer:

That would be True

Explanation:

granite is a part of the crust layer.

Answer:

C. Strong electrolytes can be expected to 100% dissociate in aqueous solution

Explanation:

The emission wavelength of the atoms excited above the ground state is 599.8 nm.

The emission wavelength of the atom is determined by using the following formulas as shown below;

E = hf

E = hc/λ

where;

λ = hc/E

λ = (6.626 x 10⁻³⁴ x 3 x 10⁸) / (3.314 x 10⁻¹⁹)

λ = 5.998 x 10⁻⁷ m

λ = 599.8 x 10⁻⁹ m

λ = 599.8 nm

Thus, the emission wavelength of the atoms is 599.8 nm.

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Answer:

The answer for this selection is 4

Explanation:

Answer:

tin Is more reactive than copper so it reduces oxygen from copper

The complete statement is  "Bacteria contribute to the nitrogen cycle by removing nitrogen from the air and converting it into a form that is usable by plants." This is further explained below.

Generally, Bacteria are mono-celled tiny creatures that can be beneficial. Bacteria are germs with a simpler cell structure than many other creatures.

In conclusion, Bacteria contribute to the nitrogen cycle by removing nitrogen from the air and converting it.

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Answer:bacteria

Explanation:

Answer: 0.109 mol

Explanation:

Balanced chemical equation:

3 Na(s) + AlCl3(aq) --> 3 NaCl(aq) + Al(s)

3 moles of sodium metal react with 1 mole of aluminum chloride to produce 3 moles of aluminum chloride and 1 mole of solid aluminum

Molar mass of Na = 22.99 g/mol

Mass(Na) = 7.5 g

Find number of moles of Na:

n = mass of Na/molar mass of Na

=(7.5 g)/(22.99 g/mol)

= 0.3262 mol

Molar mass of AlCl3,

MM = 1*MM(Al) + 3*MM(Cl)

= 1*26.98 + 3*35.45

= 133.33 g/mol

Mass(AlCl3) = 20.0 g

Find number of moles of AlCl3,

n = mass of AlCl3/molar mass of AlCl3

=(20 g)/(1.333*10^2 g/mol)

= 0.15 mol

Balanced chemical equation is:

3 Na + AlCl3 ---> Al + 3 NaCl

3 mol of Na reacts with 1 mol of AlCl3

for 0.3262 mol of Na, 0.1087 mol of AlCl3 is required

But we have 0.15 mol of AlCl3

So, Na is the limiting reagent and we will use it in our further calculations.

According to balanced equation:

mol of Al formed = (1/3) * moles of Na

= (1/3)*0.3262

= 0.1087 mol

Answer: 0.109 mol of aluminum will precipitate out as a result of the reaction

Explanation:

limiting is NH3

NO:27/88g

H2O: 25/09g

Answer: B Hope this helps :)

One material property that is widely used and recognized is the strength of a material. But what does the word "strength" mean? "Strength" can have many meanings, so let us take a closer look at what is meant by the strength of a material. We will look at a very easy experiment that provides lots of information about the strength or the mechanical behavior of a material, called the tensile test.

The basic idea of a tensile test is to place a sample of a material between two fixtures called "grips" which clamp the material. The material has known dimensions, like length and cross-sectional area. We then begin to apply weight to the material gripped at one end while the other end is fixed. We keep increasing the weight (often called the load or force) while at the same time measuring the change in length of the sample.

Explanation:

Answer:

OH^- and H_2O

Explanation:

Remember these things about basic and acidic medium

Answer:false you are welcome

Explanation:

Answer: False I hope this helpful please mark me brainlist

Explanation:

Kinetic friction is the friction acting upon a moving object. It would be the frictional force against you if you pulled a box across a table.Static friction is the frictional force needed to overcome to get an object at rest into motion.

Answer:

HI>HBr>HCL>HF

Explanation:

Moles of O_2:-

Mass of O_2:-

Option B

As per the given balanced reaction, 0.75 moles of aluminum metal requires 0.56 moles of oxygen gas for completely reaction. One mole of oxygen gas is 32 g. Then, mass of 0.56 moles is 18 g.

Metals and metal like elements such as aluminum Al are more reactive towards atmospheric oxygen and forms their oxide layers in the metallic surface.

Al₂O₃ is an essential mineral of aluminum formed by the reaction with oxygen as given in the balanced chemical equation. As per this equation, 4 moles of Al requires 3 moles of oxygen for complete reaction.

The number of moles of oxygen required by 0.75 moles of Al is:

(0.75 × 3) /4 = 0.56 moles.

one mole of oxygen weighs 32 g/mol.

mass of 0.56 moles of O₂ = 32 × 0.56 = 18 g.

Therefore, the mass required by 0.75 moles of Al in the reaction is 18 g.

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The final pressure in the flasks (containing N₂ and CO) after the stopcock is opened is 1.57 atm

n = PV / RT

n = (2 × 4) / (0.0821 × 273)

n = 0.357 mole

n = PV / RT

n = (1.4 × 10) / (0.0821 × 273)

n = 0.625 mole

P = nRT / V

P = (0.982 × 0.0821 × 273) / 14

P = 1.57 atm

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Answer:

chemical equilibrium, condition in the course of a reversible chemical reaction in which no net change in the amounts of reactants and products occurs. A reversible chemical reaction is one in which the products, as soon as they formed, react to produce the original reactants.

Explanation:

chemical equilibrium is the state in which both reactants and products are present in concentrations which have no further tendency to change with time, so that there is no observable change in the properties of the system.

The mass of HCHO2 and NaCHO2 to be added to the buffer solution are 0.23g and 0.44g respectively

Data;

To calculate the mass of reagent added,  let's start with HCHO2

The mass of HCHO2 to be added is the number of moles of HCHO2 multiplied by it's molar mass.

[tex]260*10^-^3 * 2.5*10^-^2 * 46 = 0.229 = 0.23g[/tex]

The mass of NaCHO2 to be added in the buffer solution is

[tex]260*10^-^3*2.5*10^-^2*68 = 0.442 = 0.44g[/tex]

The mass of HCHO2 and NaCHO2 to be added to the buffer solution are 0.23g and 0.44g respectively

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Answer:

The answer is A. an unbalanced force

Explanation:

This is because the force from the hammer on the nail causes a force that unbalanced  normal forces on the nail.