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Answer:

the answer is A

Explanation:

Hopefully u get the answer right

Answer:

A

Explanation:

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Answer:

Now, the molar solubility of lead(II) phosphate in water is said to be equal to 6.2⋅10−12mol L−1 . This means that in one liter of water, presumably at room temperature, you can only hope to dissolve 6.2⋅10−12 moles of lead(II) phosphate.

Explanation:

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Answer: CH4 + 1,5 O2 ⇒ CO + 2 H2O, then multiply numbers by 2

Explanation:

Answer:

1.25 mL/s

Explanation:

Your are told that 25.0 mL of H2 was produced 20 seconds. This is equal to rate 25/20 = 1.25 mL/s

When a reaction progresses, the reactant concentration gradually decreases and the product concentration gradually increases. Here the rate of the reaction is 1.25 mL/s.

The rate of a chemical reaction is defined as the rate of decrease of concentration of a reactant or the rate of increase of concentration of a product. The rate of the reaction is usually expressed in units mol L⁻¹s⁻¹. The rate of the reaction are affected by several factors like concentration of the reactants, temperature, etc.

An equation which expresses the experimentally observed rate of a reaction in terms of the molar concentration of the reactants which determine the rate of the reaction is called rate equation.

Here it is seen that 25.0 mL of H2 was produced 20 seconds. So the rate is given as:

Rate = 25/20 = 1.25 mL/s

Thus the rate of the reaction is 1.25 mL/s.

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Answer:

This is polar

Explanation:

If the arrows are of different lengths, and if they do not balance each other, the molecule is polar.

If the arrangement is asymmetrical, the molecule is polar.

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Answer:

[tex][Sr^{2+}]=5.66x10^{-4}M[/tex]

Explanation:

Hello there!

In this case, given the solubility equilibrium of strontium sulfate:

[tex]SrSO_4(s)\rightleftharpoons Sr^{2+}(aq)+SO_4^{2-}(aq)[/tex]

Whose equilibrium expression is:

[tex]Ksp=[Sr^{2+}][SO_4^{2-}][/tex]

In such a way, we can introduce the molar solubility, s, in the equation to obtain:

[tex]Ksp=s*s=s^2\\\\3.2x10^{-7}=s^2[/tex]

Then, we apply the square root to obtain:

[tex]s=\sqrt{3.2x10^{-7}}\\\\s=5.66x10^{-4}M[/tex]

Which is also the concentration of strontium ions:

[tex][Sr^{2+}]=5.66x10^{-4}M[/tex]

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Answer:

I'm pretty sure a lot of them are melting because of global warming

Answer:

4305

Explanation:

please mark this answer as brianliest

Answer: X is an Esther

Explanation: alcohol and carboxylate acid forms esters

When a carboxylic acid and alcohol react then-new substance is produced from esterification and hence is called an ester. Thus, option 2 is correct.

Esterification is the process to make esters from carboxylic acids and alcohol in the presence of an acid catalyst (dry sulphuric acid). The -COOH group of the carboxylic acids contributes to the formation of the esters.

The esterification reactions are reversible reactions and occur at a slower pace. The reaction between an acid and alcohol is shown as:

Butanoic acid + 1-pentanol (catalyst) →  water + ester

Therefore, option 2. ester is produced.

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Answer:

B

Explanation:

Answer:

Diazanium sulfate is the correct answer.

Explanation:

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Answer Liquid water

Explanation: I'm sure its that answer

Answer:

7.The answer is 2.13 because if u add 3.23 and 4.51 and the answer is 7.74 and u add 2.13 to get 9.87. 3.23 + 4.51 + 2.13 is 9.87

Explanation:

Answer:

the answer is "a" took the test

Explanation:

"Desert biome?" that's a funny way to put it. Well, the answer is most likely Mexico, United Stated, and Saudi arabia,

Mexico, Saudi Arabia and United States are countries which have a desert biome.

This is a barren area of landscape which is characterized by little precipitation and isn't best suited for plant or animal life.

Mexico, Saudi Arabia and United States all have the presence of desert biomes in some of its states.

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Answer: D is right

Explanation: One mole contains 6.0225 ·10^23 molecules

Despite of the substance

Answer:

Phosphorus

Explanation:

If you add up all the electrons (the exponents) it equals 15 which is the atomic number of phosphorus. And since stable atoms have the same number of protons and electrons it'll be phosphorus

Answer:

Due its storing and holding ability.

Explanation:

It matter that the material from which the vat is made is metal because this vat is used for storing and holding liquids. Vat is a large container or tank that is used for storing or holding liquids in industrial sector. This vat is made of metal which increases its strength and durability. If the vat is made of wood or plastic so it can't hold huge amount of liquid or chemical due to its weak material so that's why it matters that the substance from which the vat is made is metal or not.

Answer:

Crude oil is separated by fractional distillation. Crude oil is heated to vaporize the different hydrocarbons in a tank which is cool at the top and hot at the bottom. The vapours then rise and the different hydrocarbons condense at their specific boiling points, allowing them to be separated.

A possible solution for maximizing the percentage of hydrogen in discarded wood is to design a machine that can collect more effectively all the gases and separate hydrogen from other gases.

Discarded wood and other products can still produce important elements nitrogen, methane, and hydrogen. This is possible through combustion that releases these elements in a gas.

This is a new method and it is still not completely developed. Due to this, the equipment is not as efficient as one would like, for example, all gases are initially collected together but this is a problem if only one gas is needed.

Based on this, a potential solution would be to create a machine that is more efficient in collecting and separating the gases.

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Answer: A heat energy of 50160 joules are required to heat 15 grams of ice from [tex]-200^{o}C[/tex] to [tex]1400^{o}C[/tex].

Explanation:

Given : mass of ice = 15 g

Convert grams into kg as follows,

[tex]1 g = 0.001 kg\\15 g = 15 g \times \frac{0.001 kg}{1 g}\\= 0.015 kg[/tex]

Initial temperature = [tex]-200^{o}C[/tex]

Final temperature = [tex]1400^{o}C[/tex]

Formula used to calculate the amount of heat energy is as follows.

[tex]q = m \times C \times (T_{2} - T_{1})[/tex]

where,

q = heat energy

m = mass of substance

C = specific heat of substance (ice here has C = [tex]2090 J/kg ^{o}C[/tex])

[tex]T_{1}[/tex] = initial temperature

[tex]T_{2}[/tex] = final temperature

Substitute the values into above formula as follows.

[tex]q = m \times C \times (T_{2} - T_{1})\\= 0.015 kg \times 2090 J/kg^{o}C \times [1400 - (-200)]^{o}C\\= 50160 J[/tex]

Thus, we can conclude that 50160 joules are required to heat 15 grams of ice from [tex]-200^{o}C[/tex] to [tex]1400^{o}C[/tex].

Answer:

carbon electrode: delocalised electrons

molten mixture....: aluminium oxide ions

metal wire: Metal atoms

The free moving charged particles in the following substances are as follows;

Graphite, an allotrope of carbon has Delocalized (free-moving) electrons and these electrons serve to enable conductivity.

Although, cryolite is a bad conductor of electricity, when Molten Aluminium oxide and cryolite is used, the free moving Aluminium ions enable conductivity.

In metal wires, conductivity is solely the responsibility of metal ions.

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Answer:

There is no picture but the one that is in motion in the picture has kinetic energy.

Explanation:

Kinetic energy is the energy of motion.

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Answer:

The capacity for doing work. It may exist in potential, kinetic, thermal, electrical, chemical, nuclear, etc.

Answer:

55mL

Explanation:

44g / 0.8g/mL = 55mL