a certain weak base has a b of 7.10×10−7. what concentration of this base will produce a ph of 10.20?

Flammability is a chemical property that refers to the ability of a material to ignite or catch fire and burn.

This property is of particular concern when dealing with hazardous materials, as a flammable material can easily cause a fire, leading to injury and damage.

The flammability of a material is usually indicated on the product’s label. The most common warning sign is the flame symbol, which is a triangle with a flame inside. Other signs include a flame over a crossed-out circle, a flame over a bar, or words such as "flammable" or "combustible".

The flammability of a material is determined by its chemical structure, as well as its physical properties.

Materials with low flashpoints, such as highly volatile liquids and solids, are more easily ignited and therefore considered more flammable. Moreover, the presence of oxygen, or a heat source, will increase the likelihood of a material catching fire.

It is important to note that the flammability of a material can vary depending on its environment. For example, some materials may be flammable in the presence of an ignition source, such as a spark, but not in the absence of one.

Furthermore, some materials may be more flammable in certain temperatures or when exposed to certain chemicals. Therefore, it is important to be aware of the specific conditions in which a material is flammable in order to avoid potential hazards.

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Answer: I think d

Explanation:

Answer:

An outlier on a scatter plot represents something that doesn't fit.

The outlier on this scatter plot is D.(105, 320) might represent a newborn shark

(a) The number of He++ nuclei per second can be calculated using the formula:

number of nuclei = beam current / (charge per nucleus)

where the charge per nucleus of He++ is 1.60 x 10^-19 C.

number of nuclei = 0.250 mA / (1.60 x 10^-19 C)

number of nuclei = 1.56 x 10^17 nuclei/second

(b) The time for 1.00 C to strike the target can be calculated as:

time = 1.00 C / (beam current)

time = 1.00 C / (0.250 mA)

time = 4.00 s

(c) The time for 1.00 mol of He++ nuclei to strike the target can be calculated as:

time = 1.00 mol / (number of nuclei per second)

time = 1.00 mol / (1.56 x 10^17 nuclei/second)

time = 6.41 x 10^-18 s

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The pH of solution is 11. Option b is correct.

The way to measure of how acidic/basic water is pH. The range goes from 0 - 14, with 7 being neutral. pH of less than 7 indicate acidity, whereas a pH of greater than 7 indicates a base. pH is really a measure of the relative amount of free hydrogen and hydroxyl ions in the water.

The full form of pH is “Potential of Hydrogen”. pH is known as the negative logarithm of H+ ion concentration.

pH = -log(H+)

Here, H+ = \(1 \times 10^{-11}\)

pH = \(-\log{10^{-11}}\)

pH = 11

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The volume of the sugar solution in the beaker is 0.5 liters.

The question at hand involves finding the volume of a sugar solution that has a concentration of 4 grams per liter when the total amount of sugar in the beaker is 2 grams.

Here is the solution:Let V be the volume of the sugar solution in the beaker. The concentration of sugar is 4 grams/liter. Thus, the total amount of sugar in V liters of the sugar solution is 4V grams of sugar. The problem states that the total amount of sugar in the beaker is 2 grams.

Therefore:4V = 2V = 2/4 = 0.5 liters. Therefore, the volume of the sugar solution in the beaker is 0.5 liters.

:The volume of the sugar solution in the beaker is 0.5 liters.

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Answer:

Magnesium

Iron

Copper

Lead

Silver

Explanation:

Changing the amount of carbon dioxide in the atmosphere has a significant impact on the Earth's temperature and the presence of life.

Carbon dioxide plays a crucial role in the greenhouse effect, which regulates the planet's temperature. Without carbon dioxide and other greenhouse gases, the Earth would be significantly cooler.

The presence of carbon dioxide in the atmosphere is essential for supporting life on Earth. Carbon dioxide, along with other greenhouse gases, acts as a blanket that traps heat and prevents it from escaping into space. This phenomenon is known as the greenhouse effect.

When sunlight reaches the Earth's surface, some of the energy is absorbed, while the rest is reflected back into space. The absorbed energy warms the Earth. However, a portion of this reflected energy is trapped by greenhouse gases, including carbon dioxide, in the atmosphere. These gases reemit the energy in all directions, including back to the Earth's surface, thus further contributing to the warming effect.

By increasing the concentration of carbon dioxide in the atmosphere, the greenhouse effect intensifies. This leads to an increase in the Earth's temperature, often referred to as global warming or climate change. The additional carbon dioxide enhances the heat-trapping ability of the atmosphere, causing a rise in average global temperatures.

Conversely, reducing the amount of carbon dioxide in the atmosphere would have a cooling effect. The absence of carbon dioxide and other greenhouse gases would result in a significant decrease in the Earth's temperature. In fact, without these gases, the Earth would be approximately 59°F (33°C) cooler, making it inhospitable for many forms of life as we know it.

Therefore, altering the amount of carbon dioxide in the atmosphere directly impacts the Earth's temperature and climate, influencing the conditions necessary for the existence of life on our planet.

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Answer:

the 2nd one (It changes food into energy that the organism can use)

Answer:

sorting/classifying

Explanation:

.

Answer: During a chemical change, the composition of matter always changes

Explanation:

Because the conducting zone structures have no gas exchange function, they are called anatomical dead space. The respiratory system can be divided into two main zones: the conducting zone and the respiratory zone.

The conducting zone refers to the series of airways that transport air into and out of the lungs. It includes structures such as the nasal cavity, pharynx, larynx, trachea, bronchi, and bronchioles.

The purpose of the conducting zone is to facilitate the movement of air, providing a pathway for the inhaled and exhaled air to travel through. However, this zone does not participate in the actual exchange of gases, such as oxygen and carbon dioxide, between the respiratory system and the bloodstream.

Due to the absence of gas exchange in the conducting zone structures, it is referred to as anatomical dead space. The term "dead space" indicates that these regions do not contribute to the exchange of gases and are solely involved in the transportation of air.

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The oxidation number of the monatomic ions of the following elements are a. Cs (cesium): +1, b. Ba (barium): +2, c. As (arsenic): -3, d. Sr (strontium): +2, e. Rb (rubidium): +1.

The oxidation number of the monatomic ions of cesium, barium, arsenic, strontium, and rubidium are +1, +2, -3, +2, and +1, respectively. Below is an explanation of how the oxidation number of each element was obtained.

Oxidation state refers to the oxidation number of an atom, which indicates its state of oxidation or reduction in a chemical reaction. The oxidation state can be determined by adding up the valence electrons of an atom in its neutral state and subtracting the valence electrons that it has either gained or lost in a compound.Cesium has one valence electron, which it gives up to form an ion with a charge of +1. Therefore, the oxidation number of Cs is +1.Barium has two valence electrons, which it gives up to form an ion with a charge of +2. Therefore, the oxidation number of Ba is +2.

Arsenic has five valence electrons, but it prefers to gain three electrons to complete its outer shell of eight electrons, resulting in a charge of -3. Therefore, the oxidation number of As is -3.Strontium has two valence electrons, which it gives up to form an ion with a charge of +2. Therefore, the oxidation number of Sr is +2.Rubidium has one valence electron, which it gives up to form an ion with a charge of +1. Therefore, the oxidation number of Rb is +1. So, the oxidation number of the monatomic ions of cesium, barium, arsenic, strontium, and rubidium are +1, +2, -3, +2, and +1, respectively. Below is an explanation of how the oxidation number of each element was obtained.

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Answer:

B

Explanation:

Step 1

a. Please look at the next drawing:

First compound: C2H4

H = enthalphy = energy

H(C2H4) = H(C=C) + 4 x H(C-H) = 358 + 4 x 413 = 2010

------

Second compound: F2

H(F-F) = 154

------

Third compound: C2H4F2

H(C2H4F2) = 2 x H(C-F) + 4 x H(C-H) + H(C-C) = 2 x 485 + 4 x 413 + 495 = 3117

Therefore, ΔH = H products - H reactants = 3117 - (2010 + 154) = 953

Answer: ΔH = 953

The balanced equation is SnO₂ + 5/2 H₂ → Sn + 3/2 H₂O.

To balance the equation: SnO₂ + H₂ → Sn + H₂O, we need to ensure that the number of atoms on both sides of the equation is equal.

Start by balancing the atoms of elements that appear in only one compound on each side. In this case, we have tin (Sn) and oxygen (O). We have one Sn on the right side, so we need to balance it with a coefficient of 1 on the left side.

Next, balance the oxygen atoms. We have two O atoms in SnO₂ and one O atom in H₂O, giving us a total of three O atoms on the left side. To balance this, we place a coefficient of 3/2 in front of H₂O, resulting in 3/2 H₂O.

Now, balance the hydrogen (H) atoms. We have four H atoms in H₂ and one H atom in 3/2 H₂O, giving us a total of 5/2 H atoms on the left side. To balance this, we place a coefficient of 5/2 in front of H₂, resulting in 5/2 H₂.

The balanced equation is: SnO₂ + 5/2 H₂ → Sn + 3/2 H₂O.

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True, the side chain of an amino acid differentiates one amino acid from another.

Amino acids are the building blocks of protein, which is a macronutrient essential for the growth and repair of body tissues, among other things.

The side chain of an amino acid distinguishes it from other amino acids. Amino acids are organic compounds that have two functional groups: an amino group (-NH2) and a carboxyl group (-COOH). They can be divided into two categories: non-essential amino acids, which are made by the body, and essential amino acids, which must be obtained from food.

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Answer:

77460 g

Explanation:

To solve this problem first we convert molecules into moles, using Avogadro's number:

3.47x10²⁶ molecules ÷ 6.023x10²³ molecules/mol = 576.12 moles

Then we convert 576.12 CuCl₂ moles into grams, using its molar mass:

576.12 mol * 134.45 g/mol = 77460 g

So the answer is 77460 g, or 77.46 kg.

Answer:

The correct answers are C. Ammonium nitrate - NH4ClO and D. Ammonium phosphate - NH4(PO4)3

Explanation:

Answer:

D. Condensation

Explanation:

a. The magnitude of electric field is found to be E = 5.14 x 10¹¹ N/C ,

b. The direction of the electric field that the electron produces at the location of the nucleus is radial

c. the magnitude of the magnetic field is 2.63 x 10⁻⁷ T

a. To find the magnitude of the electric field that the electron produces at the location of the nucleus, we can use Coulomb's law, which states that the electric force between two point charges is proportional to the product of their charges and inversely proportional to the square of the distance between them. In this case, the electron has a charge of -1.6 x 10⁻¹⁹ C, and the nucleus has a charge of +1.6 x 10⁻¹⁹ C (since the hydrogen atom is neutral, the nucleus must have a positive charge). The distance between the electron and the nucleus is the radius of the electron's orbit, which is 5.3 x 10⁻¹¹ m.

Therefore, the magnitude of the electric field is:

E = (k * q₁ * q₂) / r²

E = (9 x 10⁹ N m²/C²) * (1.6 x 10⁻¹⁹ C) * (-1.6 x 10⁻¹⁹C) / (5.3 x 10⁻¹¹ m)²

E = 5.14 x 10¹¹ N/C

where k is Coulomb's constant.

b. The direction of the electric field that the electron produces at the location of the nucleus is radial, pointing directly from the electron toward the nucleus. This is because the electric force between two point charges always points along the line connecting them, and in this case, the electron and the nucleus are both point charges. Therefore, the electric field points inward, toward the nucleus.

c. The magnetic field produced by the electron is given by the formula:

B = (μ0/4π) * (q * v * sinθ) / r²

where μ0 is the permeability of free space (4π x 10⁻⁷ T m/A), q is the charge of the electron, v is its speed, θ is the angle between the velocity vector and the line connecting the electron and the nucleus, and r is the distance between them. Since the electron is moving in a circular orbit, its velocity vector is perpendicular to the line connecting it to the nucleus, so θ is 90 degrees and sinθ is 1. Therefore, the magnitude of the magnetic field is:

B = (μ0/4π) * (q * v) / r²

B = (4π x 10⁻⁷ T m/A) * (-1.6 x 10⁻¹⁹ C) * (2.2 x 10⁶ m/s) / (5.3 x 10⁻¹¹ m)²

B = 2.63 x 10⁻⁷ T

where T is the unit of magnetic field called the Tesla.

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When hydrochloric acid (HCl) reacts with a metal, it will produce hydrogen gas (H₂) and a salt of the metal. The reaction is commonly referred to as a metal-acid reaction or a single displacement reaction.

The general chemical equation for the reaction between hydrochloric acid and a metal (M) is:

2HCl + M → MCl₂ + H₂

In this equation, two molecules of hydrochloric acid (2HCl) react with one atom of the metal (M), resulting in the formation of one molecule of metal chloride (MCl₂) and one molecule of hydrogen gas (H₂).

The specific metal chloride formed will depend on the identity of the metal involved in the reaction.

For example, if zinc (Zn) is the metal reacting with hydrochloric acid, the equation would be:

2HCl + Zn → ZnCl₂ + H₂

Similarly, if magnesium (Mg) reacts with hydrochloric acid, the equation would be:

2HCl + Mg → MgCl₂ + H₂

This reaction is commonly observed in chemistry experiments and is used to generate hydrogen gas or to study the reactivity of metals with acids.

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heres your answer mate...

Answer: approximately 18.75 mL of 3.0 M HNO₂ solution can be completely neutralized by 75 mL of 1.5 M Mg(OH)₂ solution.

Explanation:

To determine the volume of 3.0 M HNO₂ solution that can be neutralized by 75 mL of 1.5 M Mg(OH)₂ solution, we can set up an equation based on the stoichiometry of the balanced chemical equation.

The balanced chemical equation for the neutralization reaction between HNO₂ and Mg(OH)₂ is:

2 HNO₂ + Mg(OH)₂ → Mg(NO₂)₂ + 2 H₂O

From the equation, we can see that it takes two moles of HNO₂ to react with one mole of Mg(OH)₂.

First, let's calculate the number of moles of Mg(OH)₂ present in 75 mL of 1.5 M solution:

Number of moles of Mg(OH)₂ = Volume (in L) × Concentration (in mol/L)

= 75 mL × (1 L / 1000 mL) × 1.5 mol/L

= 0.1125 mol

Since the stoichiometry ratio is 2:1 (HNO₂:Mg(OH)₂), we can conclude that 0.1125 moles of Mg(OH)₂ can neutralize 0.1125/2 = 0.05625 moles of HNO₂.

Now, let's determine the volume of 3.0 M HNO₂ required to contain 0.05625 moles:

Volume (in L) = Number of moles / Concentration (in mol/L)

= 0.05625 mol / 3.0 mol/L

≈ 0.01875 L

Finally, we convert the volume from liters to milliliters:

Volume (in mL) = Volume (in L) × 1000

≈ 0.01875 L × 1000

≈ 18.75 mL

Explanation:

it is the one you have selected because it is the only solid one