What is the pH of a 1x10-2 M NaOH solution?
a. pH = 2
b.pH = 12
c.pH = 1x10-2
d. pH = 1x10-12
Oe. None of the above

Upon studying the orbit of Uranus more closely, astronomers realized its orbit was being affected by the presence of another very large mass - so the hunt was on for another large planet. He sent his prediction to the Astronomer Royal, Sir George Airy, who passed it on to an 'observer'.

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The position of Uranus was predicted by determining the position of a larger mass ( Neptune ) exerting a gravitational push on Uranus

Uranus is the 7th planet in the galaxy it was initially  discovered with the aid of a telescope by an astronomer whom initially thought it was a star.

The position of Uranus was predicted when an astronomer ( John Couch Adams ) and his colleague predicted the gravitational effect on Uranus from another larger mass ( Neptune ). they discovered the position of the larger mass affecting the orbit of Uranus and the position of this larger mass ( Neptune ) was used to predict the position of Uranus in the galaxy.

Hence we can conclude that the position of Uranus was predicted by determining the position of a larger mass ( Neptune ) exerting a gravitational push on Uranus

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Answer:

This question is a bit vague. We're not told if 500ml is the volume of the solution and additional info is not given to calculate the volume of pbNo3 being added.

If you solve with 500ml as the volume of solution ... You'll have the answer below.

Molarity=moles of solutes/Volume of solvent(in litres)

moles of solute given=1.565moles

Volume = 500ml. There's 1000ml to a litre. Dividing by 1000ml to convert to Litres... You have 0.5L

Molarity = 1.565/0.5

=3.13M

Answer:

The Coriolis effect

Explanation:

The Coriolis effect is the effect that makes tornados, water spouts, and are often seen in storms. They make water curve and rotate as well as the wind And current.

Answer:

40.1 g

Explanation:

The balanced equation is:

First we convert 86.5 g of calcium chlorate into moles, using its molar mass:

Then we convert Ca(ClO₃)₂ moles into O₂ moles, using the stoichiometric coefficients of the balanced reaction:

Finally we convert O₂ moles into grams:

Answer:

Explanation:

The peak at 1700-17200 cm⁻¹ in the infrared spectrum shows the existence of a carbonyl group (C=O).  The appearance of an OH peak is shown by the broad peak at 2500-3000 cm⁻¹. The peak at 12.4 ppm in 1H NMR identifies the existence of carboxylic acid. The peaks at 6.78 ppm and 7.11 ppm suggest that the prevalence existence of a benzene ring in the molecule. Because these peaks are doublets, the benzene is being para-substituted.

The existence of the CH2 group is shown by the peak at 2.49 ppm, which integrates 2 hydrogens. Provided that the breaks are doublets, It would be bound to another CH2 molecule as well as carbon that is devoid of hydrogen (benzene carbon).

The existence of the CH2 group, which is linked to the above-listed CH2 group, is also demonstrated by the next peak at 2.8 ppm. It must be bonded with carbonyl carbon so it breaks as a doublet. As a result, it has a greater chemical transition. The CH3 category is shown by the peak at 3.72 ppm. Its chemical change is strong, indicating that CH3 is linked to an oxygen atom that is linked to benzene.

NMR details at 13C. Carbonyl carbon of acid has a high (peak) at 173.89 ppm. Benzene carbon peaks range from 113.55 to 157.87 ppm. The peak at 64 is made up of CH3, while the other two are made up of CH2.

The structure of the diagram is shown below with its degree of unsaturation.

Answer:

Explanation:

your not so smart

Answer:

yes.

Explanation:

Hotel: trivago

Answer:

Density differences

Explanation:

The water transports cool masses of air and hot air, the transports is driven by the amount of changes of Temperature and Salinity (ThermoHaline)

Answer:  4 atoms is the answer. I hope it helped you.

Explanation:

Answer:

50 dm³

Explanation:

Assuming constant temperature, we can solve this problem using Boyle's law, which states:

Where in this case:

We input the data:

And solve for V₂:

Thus the answer is 50.0 dm³ H₂.

Answer:

Rutherford passed beams of alpha particles through a thin gold foil to observe the atom and noted how the alpha particles scattered from the foil.

Observations of Rutherford's alpha ray scattering experiment:

1.Most of the α-particles passed straight through the gold foil without any deviation.

2. Some of the α-particles were deflected by the foil by some angles.

3.Interestingly one out of every 12,000 alpha particles appeared to rebound

Conclusion of Rutherford's scattering experiment:

1.Most of the space inside the atom is empty because most of the α-particles passed through the gold foil without getting deflected.

2. Very few particles were deflected from their path, indicating that the positive charge of the atom occupies very little space.

3. A very small fraction of α-particles were deflected by very large angles, indicating that all the positive charge and mass of the gold atom were concentrated in a very small volume within the atom.

Answer:

planet asteroid

Explanation:

planet asteroid

Explanation:

21.0 g of potassium reacts with 62.5 g of barium nitride, what mass of potassium nitride will be produced

Answer:

b) The total moles of each element present in the reactants and in the products.

Explanation:

Hello there!

In this case, since the law of conservation of mass is used to realize that the mass, atoms and molecules of all the species involved in a chemical reaction must be the same at both reactants and products, we can see that a and c stand for those that must be equal; thus, we infer that the moles can be different as they stand for the amount of substance which is related to the mass via molar masses. Therefore, the answer would be b) The total moles of each element present in the reactants and in the products.

Regards!

Answer:

0.75 L

Explanation:

V1/T1 = V2/T2

V1 = 0.520 L

T1 = 18 C = 291 K (make sure to convert to Kelvin by adding 273 to the Celsius temperature)

V2 = ?

T2 = 422 K

Solve the equation for V2

V2 = V1T2/T1

V2 = (0.520 L)(422 K) / (291 K) = 0.754 L ≈ 0.75 L (since it says to only give two significant figures)

Answer:

1.84

Explanation: just input the value into the formula pv=nrt

p*30=2*0.08206*337 then divide both sides by 30 and  get 1.84

Answer:

Explanation:

Around 439 million years ago, 86% of life on Earth was wiped out. Scientists believe two major events resulted in this extinction: glaciation and falling sea levels. Some theories suggest that the Earth was covered in such a vast quantity of plants that they removed too much carbon dioxide from the air which drastically reduced the temperature. Falling sea levels were possibly a result of the Appalachian mountain range forming. The majority of the animal life lived in the ocean. Trilobites, brachiopods, and graptolites died off in large numbers but interestingly, this did not lead to any major species changes during the next era.

Answer:

[tex]m_{solute}=0.05g[/tex]

Explanation:

Hello there!

In this case, according to the equation for the calculation of the parts per million:

[tex]ppm=\frac{m_{solute}}{m_{solution}} *1x10^6[/tex]

It is possible to solve for the mass of KI (solute) as shown below:

[tex]m_{solute}=\frac{ppm*m_{solution}}{1x10^6}[/tex]

Thus, we plug in to obtain:

[tex]m_{solute}=\frac{25*2,000g}{1x10^6} \\\\m_{solute}=0.05g[/tex]

Best regards!

Answer:

1) increase concentration

2) decrease the amount

3) decrease the concentration

4) it would increase

Explanation: edge 2021

Answer:

1) increase concentration

2) decrease the amount

3) decrease the concentration

4) it would increase

Explanation:

Answer:

The solution is Basic

Answer:

pH = 2.25

Explanation:

pH is a measurement in chemistry defined as the -log [H₃O⁺]. Molarity [], is defined as the ratio between moles of solute (HCl) and the liters of solution

To solve this question we must find the molarity of the H₃O⁺ knowing: [HCl] = [H₃O⁺]

[HCl]:

0.0084moles / 1.500L

= 0.0056M = [HCl] = [H₃O⁺]

pH = -log [H₃O⁺] = -log [0.0056M]

A solution prepared by dissolving 0.0084 moles of HCl in 1500 mL of solution has a molar concentration of HCl of 5.6 × 10⁻³ M, a molar concentration of H₃O⁺ of 5.6 × 10⁻³ M and a pH of 2.3.

A solution is prepared by dissolving 0.0084 moles of HCl in 1500 mL of solution. The molarity of HCl is:

[tex][HCl] = \frac{0.0084mol}{1.5L} = 5.6 \times 10^{-3} M[/tex]

HCl is a strong acid according to the following equation.

HCl(aq) + H₂O(l) ⇒ Cl⁻(aq) + H₃O⁺(aq)

Thus, the concentration of H₃O⁺ will be equal to the initial concentration of HCl, 5.6 × 10⁻³ M.

Finally, we will calculate the pH of the solution using its definition.

[tex]pH = -log [H_3O^{+} ] = -log (5.6 \times 10^{-3} ) = 2.3[/tex]

A solution prepared by dissolving 0.0084 moles of HCl in 1500 mL of solution has a molar concentration of HCl of 5.6 × 10⁻³ M, a molar concentration of H₃O⁺ of 5.6 × 10⁻³ M and a pH of 2.3.

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Answer: As the temperature of a molecular system increases, the kinetic energy of molecules also increase. Also as the temperature of a molecular system decreases, the kinetic energy of the molecules will also decrease.

Explanation:

James Clerk Maxwell developed the kinetic-molecular theory (KMT) of gases. In this theoey, five assumptions concerning an ideal gas was made. One of the them was that," the average kinetic energy of the gas molecules is proportional to the temperature of the gas". This simply means that a s the temperature of a molecular system increases, the kinetic energy of molecules also increase. Also as the temperature of a molecular system decreases, the kinetic energy of the molecules will also decrease.

Also another scientist known as Rudolf Clausius incorporated energy into the kinetic theory. He proposed that heat is a form of energy that affects the temperature of matter by changing the motion of molecules in matter.

Heat is defined as the flow of energy which is caused by difference in temperature.

In conclusion, when the temperature of a system is increased, the collision of the molecules with one another and the walls of their container increases as more molecules gain more heat energy at higher temperature. While as the temperature of the system decreases, the collision of the molecules will also decrease as molecules lose heat energy at lower temperature.

Answer:

Temperature increases the average kinetic energy of the atoms as well as molecules increases because when the temperature increases the collision between the atom and molecules increases and particles may collide with one another.

because it may associate with the thermal energy when thermal energy increases because of the motion of the gas particle and may initiate the kinetic energy of the gas.

when the temperature goes increasing the movement of the particle is at a very high rate, especially in gas and then solids, and especially this must be increased when the endothermic reaction is involved this must proceed such a reaction that the temperature results in to increase in the average kinetic energy.

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Answer:

78.14% Pb²⁺ and 21.86% of Cd²⁺

Explanation:

The first titration involves the reaction of both Pb²⁺ and Cd²⁺

In the second titration, as the buffer is HCN/NaCN, the Cd²⁺ precipitates as Cd(CN)₂ and the only ion that reacts is Pb²⁺

In the first titration:

Moles EDTA = Moles Pb²⁺ and Cd²⁺:

28.89mL = 0.02889L * (0.06950moles / L) = 2.008x10⁻³ moles in the aliquot. In the sample:

2.008x10⁻³ moles * (250.0mL / 50.0mL) =

0.01004 moles = Pb²⁺ + Cd²⁺ (1)

In the second titration:

19.07mL = 0.01907L * (0.06950mol / L) = 1.325x10⁻³ moles Pb²⁺ in the aliquot. In the sample:

1.325x10⁻³ moles Pb²⁺ * (250.0mL / 50.0mL) =

6.626x10⁻³ moles Pb²⁺

That means the moles of Cd²⁺ are:

0.01004 moles = Cd²⁺ + 6.626x10⁻³ moles Cd²⁺

3.413x10⁻³ moles Cd²⁺

The mass of each ion is:

Cd²⁺ -Molar mass: 112.411g/mol-:

3.413x10⁻³ moles Cd²⁺ * (112.411g / mol) =

0.384g of Cd²⁺

Pb²⁺ -Molar mass: 207.2g/mol-:

6.626x10⁻³ moles Pb²⁺ * (207.2g / mol) =

1.373g of Pb²⁺

The percent mass of each ion is:

1.373g Pb²⁺ / 1.757g = 78.14% Pb²⁺

And:

0.384g of Cd²⁺ / 1.757g * 100 = 21.86% of Cd²⁺

Answer:

-.30

Explanation:

H2SO4/sulfuric acid/dihydrogen sulfate is a strong acid, meaning that it easily releases an H+. You have to be careful with this problem, however, as H2SO4 is really only a strong acid for one of its hydrogens. In other words, after it becomes HSO4- upon releasing an H+, it is no longer a strong acid and therefore should not be factored into our calculation.

Now, moving onto the calculation, there are two key things we need to carry it out. First is the pH equation. pH = -log [H+]. And second is the concentration of H2SO4, which is equivalent to the concentration of that H+ released: 2.0 M.  Simply plug in your values.

pH = -log [2.0].

pH = -.30

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Answer: True

I hope this helped!

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Answer:

true

Explanation:

Answer:

The food chain starts as prey to a preditor and then when the preditor dies the prey eat the preditor

Explanation:

Just that

True. 1.) Gravity cause all objects to fall at the same rate of speed as there is no air

resistance.

In fact, gravity works independently of mass. This means that all objects should fall at the same rate.

If there is no air resistance, or the same amount of air resistance, then objects of the same mass will fall at the same rate.

Explanation:

I think it is the first option

Answer:

1) They expand to completely fill their container.   :)

Explanation: