Can somebody help me pls pls pls pls pls

Answer:

b?

Explanation:

Chemicals after the reaction ends during chemical equation. Therefore, the correct option is option B among all the given options.

In chemistry, you will frequently come across a chemical equation. It is a textual depiction of the procedure that takes place throughout a chemical reaction using numbers and symbols.

The reactants are placed on the left side of such an arrow in a chemical equation, while the reaction's products are placed on the right. Though certain equations may imply equilibrium with the reaction occurring in both directions simultaneously, the tip of the arrow normally heads toward the right or product side of the equation. Chemicals after the reaction ends during chemical equation.

Therefore, the correct option is option B.

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Answer: maybe you need to do very dilute solution?

Explanation: you should have an pH meter instead of indicator.

Phosphoric acid H3PO4 have three ekvivalent points.

Another way could be using a conductivity meter.

Answer: The empirical formula is [tex]P_2O_5[/tex]

Explanation:

Mass of O = 5.717 g

Mass of P= (10.150-5.717) g = 4.433 g  

Step 1 : convert given masses into moles.

Moles of O =[tex]\frac{\text{ given mass of O}}{\text{ molar mass of O}}= \frac{5.717g}{16g/mole}=0.357moles[/tex]

Moles of P=[tex]\frac{\text{ given mass of P}}{\text{ molar mass of P}}= \frac{4.433g}{31g/mole}=0.143moles[/tex]  

Step 2 : For the mole ratio, divide each value of moles by the smallest number of moles calculated.

For O = [tex]\frac{0.357}{0.143}=2.5[/tex]  

For P =[tex]\frac{0.143}{0.143}=1[/tex]

The ratio is to be converted to whole number

Thus whole number ratio of O : P = [tex]2.5\times 2:1\times 2=5: 2[/tex]

Hence the empirical formula is [tex]P_2O_5[/tex]

Answer:

its made up of both but I would probably say kinetic

Explanation:

Answer:

8.8g of ammonium chloride would be undissolved.

Explanation:

The solubility of ammonium chloride at 80°C is: 65.6g / 100mL

As the solubility is 65.6g / 100mL, in 200g = 200mL the solubility will be:

65.6g * 2 =

131.2g / 200g

That means the water at this temperature will dissolve 131.2g of ammonium chloride. As were placed 140g, the mass that will be undissolved is:

140g - 131.2g =

Answer:

A mole ratio is a conversion factor that relates the amounts in moles of any two substances in a chemical reaction

Explanation:

Answer:

A. 650 moles of sulphur.

B. 30 g of FeS₂

Explanation:

The balanced equation for the reaction is given below:

Fe + 2S —> FeS₂

From the balanced equation above,

1 mole of Fe reacted with 2 moles of S to produce 1 mole of FeS₂.

A. Determination of the mole of sulphur needed for the reaction.

From the balanced equation above,

2 moles of S reacted to produce 1 mole of FeS₂.

Therefore, Xmol of S will react to produce 325 moles of FeS₂ i.e

Xmol of S = 2 × 325

Xmol of S = 650 moles

Thus, 650 moles of sulphur are needed for the reaction.

B. Determination of the mass of FeS₂ produced by the reaction of 0.5 mole of sulphur.

From the balanced equation above,

2 moles of S reacted to produce 1 mole of FeS₂.

Therefore, 0.5 mole of S will react to produce = (0.5 × 1)/2 = 0.25 mole of FeS₂.

Finally, we shall determine the mass of 0.25 mole of FeS₂. This can be obtained as follow:

Mole of FeS₂ = 0.25 mole

Molar mass of FeS₂ = 56 + (32×2)

= 56 + 64

= 120 g/mol

Mass of FeS₂ =?

Mass = mole × molar mass

Mass of FeS₂ = 0.25 × 120

Mass of FeS₂ = 30 g

Thus, 30 g of FeS₂ were obtained from the reaction.

The amount of volume will be (1) 23.10 L and ( 2) 22.4 L by using gas law.

What is gas law?

Gas law gave the relation between pressure, volume and temperature.

It can be expressed as:

PV = nRT.

where, P is pressure, R is gas constant and T is temperature.

Calculation of volume by using gas law.

1) Given data:

n = 1 mol

T = 25 degree C = 25 + 273 =

P = 100 kpa

Volume can be determined by the gas law.

PV = nRT

V = nRT/P

V = 1 × 8.31 × 278 / 100

V = 23.10 L

2) It is known that at STP 1 mol of any gas volume will be 22.4 L.

Therefore, the correct answer will be option (c).

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Answer:

144.12873

Explanation:

Hope this helps you

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回答：

144.12873

説明：

これがお役に立てば幸いです

Answer:

96gm/mole

Explanation:

(NH 4)2CO 3 =2×18+12+3×16=96gm/mole

Answer:The empirical formula is KCO2

Explanation:

Answer:

free points!!!!!!!!!!!!!!

Answer:

Cu(IO3)2 + K2CO3 → 2KIO3 + CuCO3

Answer:

It forms a barrier that prevents corrosive substances from reaching the underlying steel or iron. The zinc serves as a sacrificial anode so that even if the coating is scratched, the exposed steel will still be protected by the remaining zinc. The zinc protects its base metal by corroding before iron.

Explanation:

Answer:

It protects it from corrosion.

Explanation:

Zinc protects iron and steel from the relentless forces of corrosion. Galvanizing iron and steel by dipping them in molten zinc creates an alloy that can, in the right environmental conditions, protect the iron or steel beneath it for 100 years or more.

If a sound wave refracts,It changes its speed and wavelength when it bounces off of a solid surface,It changes its speed and wavelength when it passes through an opening, and It changes direction when it passes from one medium to another. Therefore, option A, C and D are correct.

An important case in which sound waves change form or spread out is called refraction. This phenomenon affects the bending of a sound wave owing to changes in the wave's speed.

Refraction is the reason ocean waves near a shore parallel to the beach and why glass lenses can be used to focus light waves.

If the air above the earth is warmed than that at the surface, sound will be change shape back downward toward the surface by refraction. Sound propagates in all directions from a point source.

Thus, option A, C and D are correct.

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Answers is - 198 kilo joules

Answer:

well, I think the answer is C

The difference between RNA and DNA are:

A. DNA and RNA use different sets of nitrogen bases.

C. DNA contains deoxyribose sugar and RNA contains ribose sugar.

DNA and RNA, both are genetic materials, but DNA is double-stranded and RNA is single-stranded.

DNA is present in all animals and plants, and RNA is present in viruses and bacteria.

Both are made up of nitrogenous bases and sugar.

Thus, the correct options are A and C.

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Answer:

4665.97

Explanation:

Answer:

A i think

Explanation:

The solution that could best help to restore or increase microorganisms and soil biodiversity is adding manure or compost to the soil.

A microorganism, or microbe, is an organism of microscopic size, which may exist in its single-celled form or as a colony of cells. The possible existence of unseen microbial life was suspected from ancient times, such as in Jain scriptures from sixth century BC India.

“Microorganisms are minute organisms that are invisible to the normal eye.” Microorganisms are so small that they can only be seen under a microscope. These include a huge range of organisms such as bacteria, viruses, fungi, algae, protozoa, etc.

Given options are-

A. adding manure or compost to the soil

B. spraying chemical weed-killers and fertilizers on the soil

C. removing all ground-covering plants from the soil

D. adding sewage containing synthetic materials to the soil

Therefore, The solution that could best help to restore or increase microorganisms and soil biodiversity is adding manure or compost to the soil.

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sorry I don't know 4one

i HOPE IT'S HELP

Answer: They are are simular because when the wax cools down its not hot  or it cools down it is the same with hot water it cools after along while.

Explanation:

Answer:

c: low melting point

Explanation:

melting point is dependent on intermolecular forces. in covalent compounds, electrons are shared more equally. this means there is less separation of positive and negative charges within the molecules.

Answer:

Explanation:

Go to a craft store and buy so me material that are biodegradable

Answer:

20.(45)L or about 20.4545L

Explanation:

PV = nRT

Where:

P - pressure

V - volume

n - number of particle moles

R - a constant

T - temperature in K

We can assume the P and n (and definitely R) stay the same, so we infer that

[tex]V_1 = \frac{nRT_1}{P} = 15L\\V_2 = \frac{nRT_2}{P}\\V_1 / V_2 = \frac{nRT_1}{P} / \frac{nRT_2}{P} = \frac{T_1}{T_2}\\\\15L / V_2 = \frac{330K}{450K} = \frac{11}{15}\\\\V_2 = 15L \cdot \frac{15}{11} = 20.(45)L[/tex]

Answer:

It's trueeeeeee:))))))

Answer:

TRUE

Explanation:

Answer:

1/4 of the offspeing will have the red flowers

Answer:

Explanation:

Gravity cannot be a source of centripetal force. Gravity is the force of attraction from between all masses in the universe; especially the attraction of the earth’s mass for bodies near its surface; “gravitation cannot be held responsible for people falling in love” with Albert Einstein.

It manner that is serious and solemn. A solemn and dignified feeling.

Therefore, the correct answer is d. gravity.

Answer:

b

Explanation:

he drove 5x faster than the time was when he was on the last hour (maybe caught in traffic or wasn't in a rush)