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What is the hydronium (H3O+) concentration of a solution with a pH of 3.60? A. 2.5 × 10-4 M
B. 3.0 × 10-4 M
C. 4.0 × 10-11 M
D. 4.5 × 10-11 M

Answers

Answer 1

Answer:

Answer:

A. 2.5 × 10⁻⁴ mol·L⁻¹

Explanation:

pH = -log[H₃O⁺]

$[\text{H}_(3)\text{O}^(+)] = 10^{- \text{pH}} \text{ mol/L}$

pH = 3.60

$[\text{H}_(3)\text{O}^(+)] =10^(-3.60)\text{ mol/L}$

$[\text{H}_(3)\text{O}^(+)] = 2.5 * 10^(-4)\text{ mol/L}$

Answer 2

Answer:

The hydronium concentration of a solution with a pH of 3.60 is $2.5 * 10^-^4 M$ . The correct option is A.

What is pH?

PH is a scale for the measurement of the acidic and basic solutions. The pH of less than 7 are acids and more than 7 are bases.

$\rm pH = -log[H_3O^+]\n\nH_3O^+ = 10^-^p^H\; mol/l$

pH = 3.60

$\rm H_3O^+ = 10^-^3^.^6^0\n\nH_3O^+ = 2.5 * 10^-^4 M$

Thus, the correct option is A.

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HELP Which type of light is stored energy?A. Kinetic B. Potential C. Thermal D. Field

A range of organic molecules can undergo combustion. If pyridine

Answers

Answer:

A range of organic molecules can undergo combustion. Pyridine (C5H5 combustion in the unbalanced reaction shown below wtar o 4 CsH5N + O2 +H2O + CO2 + NO a) Write the balanced equation. (2 points) # 41 CH N +170 70 the flow, t- b) Find the percent yield for the reaction if 10.0 g of pyridine dioxide. (2 points)

Explanation:

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Nf3 Rotate the molecule until you have a feeling for its three-dimensional shape. How many atoms are bonded to the central atom?

Answers

Answer:

Three atoms are attached to the central atom in NF3.

Explanation:

The central atom is always regarded as the atom having the least electronegativity in a molecule or ion. We can decide on what atom should be the central atom by comparing the relative electro negativities of the atoms in the molecule or ion.

If we consider NF3, we can easily see that nitrogen is less electronegative than fluorine, hence nitrogen is the central atom in the molecule. We can also observe from the molecular model that three atoms of fluorine were attached to the central atom. Hence there are three atoms attached to the central atom in the molecule NF3.

Balance the following redox reaction if it occurs in acidic solution. What are the coefficients in front of Ni and H+ in the balanced reaction? Ni2+(aq) + NH4+(aq) → Ni(s) + NO3-(aq)

Answers

In this case, the problem is asking for the balance of a redox reaction in acidic media, in which nickel is reduced to a metallic way and nitrogen oxidized to an ionic way.

Thus, according to the given information, it turns out possible for us to balance this equation in acidic solution by firstly setting up the half reactions:

$Ni^(2+)+2e^-\rightarrow Ni^0\n\nN^(3-)H_4^++3H_2O\rightarrow N^(5+)O_3^-+8e^-+10H^+$

Next, we cross multiply each half-reaction by the other's carried electrons:

$8Ni^(2+)+16e^-\rightarrow 8Ni^0\n\n2N^(3-)H_4^++6H_2O\rightarrow 2N^(5+)O_3^-+16e^-+20H^+$

Finally, we add them together to obtain:

$8Ni^(2+)+2N^(3-)H_4^++6H_2O\rightarrow 8Ni^0+2N^(5+)O_3^-+20H^+$

Which can be all simplified by a factor of 2 to obtain:

$4Ni^(2+)+N^(3-)H_4^++3H_2O\rightarrow 4Ni^0+N^(5+)O_3^-+10H^+\n\n4Ni^(2+)(aq)+NH_4^+(aq)+3H_2O(l)\rightarrow 4Ni(s)+NO_3^-(aq)+10H^+(aq)$

Hence, the coefficients in front of Ni and H⁺ are 4 and 10 respectively.

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When you convert feet to inches, how do you decide which portion of the conversion factor should be in the numerator and which in the denominator?

Answers

Answer : The conversion used is, $1\text{ feet}=12\text{ inches}$

Explanation :

The conversion used :

$1\text{ feet}=12\text{ inches}$

For example : To convert 10 feet into inches.

$1\text{ feet}=12\text{ inches}$

$10\text{ feet}=10\text{ feet}* \frac{12\text{ inches}}{1\text{ feet}}$

$=120\text{ inches}$

From this we conclude that, the conversion factor used in the numerator and denominator for 1 feet should be, $\frac{12\text{ inches}}{1\text{ feet}}$

Final answer:

When converting from feet to inches, use the conversion factor 12 inches/1 foot. This way, the unit 'foot' cancels out and leaves 'inches', performing the conversion. An example is converting 5 feet to inches is 5 times 12, which equals to 60 inches.

Explanation:

When you're converting units, such as feet to inches, the main guideline is to set up your conversion factor in a way that cancels out the unit you want to convert from and leaves you with the unit you want to convert to. In this case, since you're converting from feet to inches, you'll be using the fact that there are 12 inches in 1 foot as your conversion factor. Therefore, when converting, the conversion factor should be set up as 12 inches/1 foot. This in essence means you're multiplying by the number 1, which doesn't change the value, just the units.

For instance, if you have 5 feet and you want to convert this to inches, you'll set your conversion factor up as 12 inches/1 foot, with inches in the numerator and feet in the denominator, to cancel out feet. Multiply 5 feet by the conversion factor (12 inches/1 foot), the result would be 60 inches. Here, the 'feet' units cancel leaving the answer in inches, completing the conversion.

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Which of the following describes the element Mg. Choose all that apply. is very reactive as a metal forms a basic solution in water is found in nature only combined with other elements reacts vigorously with alkali metals to form salts consists of diatomic molecules in elemental form is one of the group of the least reactive elements

Answers

Answer:

The statements that describe Mg are:

1. is very reactive as a metal

2. forms a basic solution in water

3. is found in nature only combined with other elements

Explanation:

Magnesium is a s-block chemical element that belongs to group 2 and period 3 of the periodic table. It is a reactive alkaline earth metal that exists in nature only in the combined state with elements such as carbon, calcium and oxygen.

Magnesium reacts with water at room temperature, to give strongly basic metal oxide of the formula, MgO, which forms a basic solution in water.

It also reacts vigorously with halogens such as chlorine and bromine, to form salts.

Final answer:

Magnesium is a highly reactive alkaline earth metal that forms a basic solution in water and can react vigorously with alkali metals to form salts. It consists of diatomic molecules in its elemental form.

Explanation:

Magnesium is one of the alkaline earth metals, which are found in Group 2 of the periodic table. It is a highly reactive metal that forms a basic solution in water and can react vigorously with alkali metals to form salts. Magnesium also consists of diatomic molecules in its elemental form. However, it is not one of the least reactive elements; rather, it is one of the more reactive elements in Group 2.

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Four beakers containing potassium nitrate dissolved in water are allowed to evaporate to dryness. Beakers 1 through 4 contain 2.3, 1.91, 5.985, and 0.52 g of dry potassium nitrate respectively. How many moles of potassium nitrate were recovered after the water evaporated?