CHEMISTRY HIGH SCHOOL

The pH of a solution decreases by 2.0. How does the hydronium ion concentration of the solution change? increases to 2 times the original concentration
increases to 100 times the original concentration
decreases to 1/100 of the original concentration
decreases to 1/2 of the original concentration

Answers

Answer 1

Answer:

Answer: The correct answer is 'increases to 100 times the original concentration'.

Explanation:

let the initial pH be x

The original concentration of $[H^+]$ initially present be y

$x=-log[y]$ ...(1)

Final concentration of $[H^+]$ when pH reduced by 2 be z

$x-2=-log[z]$ ...(2)

Putting the value of 'x' from (1) into (2) we get :

$-log[y]-2=-log[z]$

$z=10^2y=100y$

When pH of a solution decreases by 2.0, hydronium ion concentration of the solution increases to 100 times the original concentration

Answer 2

Answer:

Answer:

B, is the answer

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A sample of hydrogen gas, has a volume of 8.56 L at a temperature 0oC and pressure of 1.5 atm. Calculate the number of moles of hydrogen present in this gas sample ( Assume that the gas behave ideally)

Answers

According to ideal gas law, there are 0.00565 number of moles of hydrogen present in the gas sample .

What is ideal gas law?

The ideal gas law is a equation which is applicable in a hypothetical state of an ideal gas.It is a combination of Boyle's law, Charle's law,Avogadro's law and Gay-Lussac's law . It is given as, PV=nRT where R= gas constant whose value is 8.314.The law has several limitations.Ideal gas law was proposed by Benoit Paul Emile Clapeyron in year 1834.It is a thermodynamic equation which has wide applications.

Gases which obey ideal gas law are difficult to exist.

Substituting the values as, P=1.5 atmospheres, V=8.56 L, R=8.314 ,T=0°C=273 K that is , n=PV/RT=1.5×8.56/8.314×273=0.00565 moles.

Thus, there are 0.00565 moles of hydrogen present in the gas sample .

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p = 1.5atm ≈ 1519.88hPa
V = 8.56L
R = 83.1 [hPa*L] / [mol*K]
T = 0°C =273K

pV = nRT |:RT

n = pV / RT

n = [1519.88hPa*8.56L] / [83.1 [hPa*L] / [mol*K] * 273K]
n ≈ 0.57mol

Explain the connection between Earth's magnetic field and iron.

Answers

The Earth's magnetic field is somewhat caused by the composition of the earth's core which is rich in iron minerals. There is a solid inner core that is made of iron which makes up to 2/3 of the moon's size. The charged metal of the iron produces electric currents, consequently resulting to Earth's magnetic field.

Answer:

The Earth's magnetic field is caused by how the earth's core is made. The earth's core is full of iron, especially in the inner core. That inner core is charged metal that produces electric currents that causes Earth's magnetic field. So because the core has iron, we have a magnetic field.

The decomposition of ammonia gas (a process that occurs at high temps) is 2KH3(g) --> N2(g) 3H2(g). If a balloon was filled with 3.5L of ammonia gas and all of the gas decomposed, what would be the total volume of gas in the container? Assume the pressure and temp remains constant.

Answers

Ammonia gas is $\text{NH}_3$ .

Since the ammonia gas took up 3.5 L at first, using Avogadro's Law, we know that 2 mols of a gas took up 3.5 L at first, but now there are 4 mols of gas in total after the decomposition. Therefore, we can conclude that now the volume in total is 7 L.

Answer : The total volume of gas in the container will be, 7 liters

Explanation :

The given balanced chemical reaction is,

$2NH_3(g)\rightarrow N_2(g)+3H_2(g)$

From the balanced chemical reaction we conclude that

2 mole of ammonia gas decomposes to give 1 mole of nitrogen gas and 3 moles of hydrogen gas.

According to the Avogadro's Law, the volume of the gas is directly proportional to the number of moles of the gas at constant pressure and temperature.

$V\propto n$

or,

$(V_1)/(V_2)=(n_1)/(n_2)$

where,

$V_1$ = initial volume of ammonia gas = 3.5 L

$V_2$ = total volume of gas in the container = ?

$n_1$ = initial moles of ammonia gas = 2 mole

$n_2$ = final moles of all gas (nitrogen + hydrogen) = (1 + 3) = 4 moles

Now put all the given values in the above formula, we get the total volume of gas in the container.

$(3.5L)/(V_2)=(2mole)/(4mole)$

$V_2=7L$

Therefore, the total volume of gas in the container will be, 7 liters

Suppose you wanted to dissolve 106 g of Na2CO3 in enough H2O to make 6.00 L of solution.(1) What is the molar mass of Na2CO3? (2) What is the molarity of this solution?

Answers

The molarity of the solution is the ratio of moles of solute to the volume of the solution in L. The molar mass of sodium carbonate is 106 g/mol and molarity is 0.167 M.

What is molar mass?

Molar mass is the mass of the compound that is given by the addition of the atomic mass of the individual atom present in the compound with respect to their stoichiometry coefficients.

The molar mass (M) of sodium carbonate can be given as,

$\rm M(Na_(2)CO_(3)) = 2M(Na)+M(C)+3M(O)$

Here mass of sodium = 23, carbon = 12 and oxygen = 16

Substituting values of the atomic mass we get:

$\begin{aligned} &=2(23)+12+3(16)\n\n&=46+12+48\n\n&=106 \;\rm g/mol\end{aligned}$

Hence, the molar mass of sodium carbonate is 106 g/mol.

Now molarity of sodium carbonate can be estimated as:

$\begin{aligned}\rm Molarity &= \rm (mass)/(\rm molar \; mass * Volume)\n\n&= (106)/(106 * 6)\n\n&= 0.16 \;\rm M\end{aligned}$

Therefore, 106 g/mol is the molar mass and 0.16 M is the molarity of sodium carbonate.

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M(Na2CO3)=2M(Na)+M(C)+3M(O)
=2(23)+12+3(16)
=46+12+48
=106 g/mol
the molar mass of Na2CO3 is 106 g/mol
m=106g M=106 g/mol n=m/M
n=m/M n=106/106 n=1mol

The number of white blood cells decreases when fighting infection.
True
False

Answers

TRUE

Does the white blood cell count decrease when fighting an infection?

This is because your body releases more of these cells to fight the infection. However, if you have certain illnesses such as HIV or cancer, your white blood cell count can drop to very low levels. Taking medicines that weaken your immune system may reduce your WBC.

it produces antibodies to fight bacteria, viruses, and other potentially harmful invaders. Neutrophils. They kill and digest bacteria and fungi. They are the most type of white blood cells and are the first line of defense in the event of an infection.

Adults have a low white blood cell count of less than 4,000 cells per microliter of blood. Low white blood cell counts can be an indicator of certain medical conditions, including lupus, rheumatoid arthritis, vitamin deficiency, or side effects of cancer treatment.

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false
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What do sound waves, light waves, and ocean waves all have in common?A.
They all transfer energy.

B.
They are all electromagnetic waves.

C.
They all require a medium to travel.

D.
They are all mechanical waves.