2. What is peat?
the aromatic compounds that are part of coal
O a soft, spongy material that may be changed into coal
O a mixture of methane, ethane, and other gaseous hydrocarbons
a very hard, dense form of coal

Answer:

Electrical resistivity is a property of a material that tells you how much it resists the flow of electric current, while conductivity quantifies how easily current flows.

Answer:

It is better to do chemistry

Explanation:

So that you will learn more of chemicals

Answer:

The pressure is equal to 0.775 atm.

Explanation:

Given that,

The atmospheric pressure on Stevens pass was measure to be 589mmHg.

We need to find the pressure in atm.

We know that,

1 standard atmosphere = 760 mm Hg

1 mm Hg = (1/760) standard atmosphere

589 mm Hg = (1/760)× 589 standard atmosphere

= 0.775 standard atmosphere

Hence, the pressure is equal to 0.775 atm.

Answer:

.025 ml 02

Explanation:

I made a pdf and pasted it in and etc

Given-

Mass of CH4 - 45.6 grams

Molar mass of CH4 - 16.04 g/mol

volume - 275mL

Temperature- 55°C

Solution,

moles of methane (CH4) n = 45.6/16.04

= 2.84 moles

Using Formula,

Pv = nRT

P*275 = 2.84*8.314*55

P = 1298.64/275

P = 4.72 Atm.

Answer - The pressure inside the container in atm is 4.72.

45.6 grams of CH4 is placed into a 275 mL container at 55.00 C. The pressure is 4.72 atm.

The pressure that one of the gases in a mixture would exert if it were in the same volume on its own.

Given the mass is 45.6 grams

The volume is 275 L

Temperature is 55.00 C.

Calculate the moles

[tex]\rm Number\;of \;moles= \dfrac{mass}{molar\;mass}\\\\\rm Number\;of \;moles= \dfrac{45.6}{16.04} = 2.84 moles[/tex]

Now, calculating the pressure

PV = nRT

[tex]P\times 275 = 2.84\times 8.314\times 55 = 4.72 atm.[/tex]

Thus, the pressure inside the container in is 4.72 atm.

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Answer:

1. 0.0500 moles K, 0.0250 moles Cr and 0.1000 moles O.

2. 9.00 moles ammonium ions are present.

Explanation:

1. In 1mol of K2CrO4 there are 2 moles of K, 1 mole of Cr and 4 moles of O.

The moles in 0.0250 moles K2CrO4 are:

0.0250mol * 2 = 0.0500 moles K

0.0250mol * 1 = 0.0250 moles Cr

0.0250mol * 4 = 0.1000 moles O

2. In 1 mole of (NH4)2CO3 there are 2 moles of ammonium ions, NH₄⁺.

In 4,50 moles are:

4.50 moles * 2 = 9.00 moles ammonium ions are present

Answer:

im really sorry but i dont no☹

Answer:

(I) [tex] m_{ZnCl_{2}} = 34.07 g [/tex]  

(II) [tex] \% y = 176.4 \% [/tex]

(III) The presence of impurities in the 32.70 g of zinc will support the student's percentage yield.

Explanation:

The reaction is:

Zn + 2HCl → ZnCl₂ + H₂

(I) To find the number of moles of ZnCl₂ we need to calculate the number of moles of the reactants.

[tex] n_{Zn} = \frac{m}{A} [/tex]

Where:

m: is the mass

A: is the standard atomic weight  

[tex] n_{Zn} = \frac{32.70 g}{65.38 g/mol} = 0.50 moles [/tex]

[tex] n_{HCl} = \frac{18.23 g}{36.458 g/mol} = 0.50 moles [/tex]

If 1 mol of Zn reacts with 2 moles of HCl, the number of moles of Zn needed to react with 0.50 moles of HCl is:              

[tex] n_{Zn} = \frac{1 mol Zn}{2 moles HCl}*0.50 moles HCl = 0.25 moles [/tex]  

Then, the limiting reactant is HCl. Now, we can find the number of moles of ZnCl₂ by knowing that 2 moles of HCl produce 1 mol of ZnCl₂.

[tex] n_{ZnCl_{2}} = \frac{1 mol ZnCl_{2}}{2 moles HCl}*0.50 moles = 0.25 moles [/tex]    

Finally, the mass of ZnCl₂ that he has produced is:            

[tex] m_{ZnCl_{2}} = n_{ZnCl_{2}}*M = 0.25 moles*136.286 g/mol = 34.07 g [/tex]  

(II) The percentage yield can be found with the following equation:

[tex] \% y = \frac{m_{e}}{m_{t}} \times 100 [/tex]

Where:      

[tex] m_{e}[/tex]: is the experimental mass = 60.1 g

[tex] m_{t}[/tex]: is the theoretical mass = 34.07 g

Hence, the percentage yield is:  

[tex] \% y = \frac{60.1 g}{34.07 g} \times 100 = 176.4 \% [/tex]

(III) The presence of impurities in zinc will explain why the percentage yield is greater than 100% because the mass of the impurities will make the mass of zinc bigger than its mass without impurities. If there were no impurities in the zinc, its mass would be smaller and thus the percent yield.

I hope it helps you!                  

Answer:

Failure to conserve water during irrigation can lead to an increase in pollution that results from runoff. Natural filters are diminished by the overuse of water resources, which leads to an increase in water contamination that would have been filtered by these natural sources.

Explanation:

Answer:

a. Overirrigating fields causes an increase in pollution that results from runoff.

b. Natural water filters are depleted by the overuse of water.

c. Sewage systems are more likely to fail due to greater demand, causing higher chances of water contamination.

Answer:

E, answer 5, A positively charged atom has more protons than electrons.

Explanation:

Answer:

false

Explanation:

you have bromine , its a non metal and liquid in room temperature

Answer:

both bonding electrons come from the oxygen atom

Explanation:

A coordinate covalent bond is said to be formed when an electron pair is donated into a empty orbital of an atom from a filled orbital of another atom.

In this type of covalent bond, the shared electron pair is furnished by only one of the bonding species.

The bonding between H^+ and H2O to form H3O^+ involves donation of a lone pair of electrons on oxygen into the empty 1s orbital of  H^+ hence the two bonding electrons come from oxygen. This is why the bond is called a coordinate covalent bond.

Answer:

A

Explanation:

If its going at a constant speed it will not accelarate wich means to speed up.

Answer:

C

Explanation:

The nucleus is very dense

Answer: water

Explanation: those elements all react to water , so the answer would be water . :)

Answer:

Explanation:

Step 1: Calculate the amount of sodium hydroxide in moles

Volume of sodium hydroxide solution = 25.0 ÷ 1,000 = 0.0250 dm3

Rearrange:

Concentration in mol/dm3 =

Amount of solutein mol = concentration in mol/dm3 × volume in dm3

Amount of sodium hydroxide = 0.100 × 0.0250

= 0.00250 mol

Step 2: Find the amount of hydrochloric acid in moles

The balanced equation is: NaOH(aq) + HCl(aq) → NaCl(aq) + H2O(l)

So the mole ratio NaOH:HCl is 1:1

Therefore 0.00250 mol of NaOH reacts with 0.00250 mol of HCl

Step 3: Calculate the concentration of hydrochloric acid in mol/dm3

Volume of hydrochloric acid = 20.00 ÷ 1000 = 0.0200 dm3

Concentration in mol/dm3 =

Concentration in mol/dm3 =

= 0.125 mol/dm3

Step 4: Calculate the concentration of hydrochloric acid in g/dm3

Relative formula mass of HCl = 1 + 35.5 = 36.5

Mass = relative formula mass × amount

Mass of HCl = 36.5 × 0.125

= 4.56 g

So concentration = 4.56 g/dm3

Answer:

Ca^2+

Explanation:

As we know, more energy is required to remove an electron from a positively charged ion than is required to remove an electron from a neutral atom. Hence, the second ionization energy of calcium is greater than its first ionization energy.

However, the third and fourth ionization energies of calcium are much higher than the second ionization energy because they involve removal of electrons from an inner filed shell. This process requires a lot of energy and is often not feasible.

Hence, the most common ion of calcium must be Ca^2+ where only two electrons are removed from calcium.

Explanation:

Normally, fusion involves two heavy hydrogen nuclides but since we have 4 light hydrogen nuclides, two of which underwent positron emission, thus changing two protons into neutrons plus 2 positrons and 2 neutrinos. The resulting nucleus from this fusion reaction is an He-4 nucleus.

Answer:

Plssssssssd can you translate to English???

Answer:

R = 40 ohms

Explanation:

Given that,

The voltage of outlet, V = 120 V

Current flowing through the device, I = 3 A

We need to find the Resistance rating of  the power cord. Let the resistance is R. We know that,

Ohm's law, V = IR

Put all the values,

[tex]R=\dfrac{V}{I}\\\\R=\dfrac{120}{3}\\\\R=40\ \Omega[/tex]

So, the resistance rating of the power cord is equal to 40 ohms.

Answer:

D.

Explanation:

Answer

0°C

Explanation:

substance be formed in it's solid state

Answer:

BBBBBBBBBBBBBBBBBBBBBBBBBBBBBBBB

The activity of four unknown metals based on their chemical changes is option B.

Chemical changes are defined as changes which occur when a substance combines with another substance to form a new substance.Alternatively, when a substance breaks down or decomposes to give new substances it is also considered to be a chemical change.

There are several characteristics of chemical changes like change in color, change in state , change in odor and change in composition . During chemical change there is also formation of precipitate an insoluble mass of substance or even evolution of gases.

There are three types of chemical changes:

1) inorganic changes

2)organic changes

3) biochemical changes

During chemical changes atoms are rearranged and changes are accompanied by an energy change as new substances are formed.

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Yes, potassium metal can be used to react with an acid to prepare a soluble salt.

Acids react with metals to yield the corresponding metal salt and hydrogen gas.

One of the properties of metals is their ability to react with dilute acids to yield  a soluble salt and hydrogen gas. This is a common reaction for all metals that are above hydrogen in the activity series.

Potassium can react with a hypothetical acid HB as follows;

2K(s) + 2HB(aq) ------> 2KB(aq) + H2(g)

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Answer:

A base is weak when only a little of it is dissolved in water

Explanation:

Answer: B.) A base is weak when only a little of it is dissolved in water

Hope this helps :)

Answer:

17.6kg

Explanation:

mass = Volume × Density

mass = 5000cm^3 × 3.52g/cm^3

mass = 17600g = 17.6kg

Answer:

B. 2.2

Explanation:

Carbon dioxide is released when limestone is heated during the production of [tex]\sf\purple{cement}[/tex]. ✔

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