The an unknown weak acid with a concentration of 0.070 m has a ph of 1.80. what is the ka of the weak acid?

Explanation:

intrusive rocks.....

.

The direction of the water between the beaker containing a 25% salt solution and the bag inside with pure water would be from beaker to bag with pure water.

If the beaker had pure water and the bag with salt solution, the water would move from bag to beaker with pure water.

The beaker has salt solution (salt (solute) + water (solvent)). The bag has pure water without any solute. The water normally moves from higher concentration to lower concentration.

Water containing solute would have higher concentration than pure water. Thus, water moves from beaker with higher concentration to bag with lower concentration. The process is called osmosis.

Similarly, if we change the components in beaker and bag, the water would move from bag with higher concentration to beaker with pure water of lower concentration.

To know more about Concentration

https://brainly.com/question/10720472

#SPJ1

Answer:

(A) Hair is made of mostly tightly packed living cells.

Explanation:

i just took the exam :) yw

a like would be nice thanks!

Answer:

A

Explanation:

Just did the exam :) Good Luck!

a) To begin precipitation of BaSO₄, a concentration of at least 87 M of sulphate ion is required.

b) When the concentration of sulphate ion reaches 0.015 M, the concentration of Ba₂⁺ remaining in solution is 7.3 x 10⁻⁹ M.

(a) The concentration of sulfate ion required to begin precipitation of BaSO₄ can be calculated using the solubility product constant (Ksp) of BaSO₄. The Ksp expression for BaSO₄ is:

 Ksp = [Ba₂⁺][SO₄²⁻]

At the point of precipitation, the concentration of Ba₂⁺ that reacts with SO₄²⁻ to form a solid BaSO₄ is equal to the concentration of Ba₂⁺ that remains in solution. Therefore, we can assume that the concentration of Ba₂⁺ in solution is equal to the solubility of BaSO₄.

Solving for the concentration of SO₄²⁻:

   Ksp = [Ba₂⁺][SO₄²⁻]

          = (solubility)² [SO₄²⁻]

⇒    0.010 = (solubility)² [SO₄²⁻]

⇒   [SO₄²⁻] = 0.010/(solubility)²

The solubility of BaSO₄ can be found in a reference table or calculated from its Ksp value. For BaSO₄, Ksp = 1.1 x 10⁻¹⁰, so:

⇒      solubility =√(Ksp)

                     =√(1.1 x 10⁻¹⁰)

                    = 1.05 x 10⁻⁵ M

Substituting the solubility into the expression for [SO₄²⁻], we get:

[SO₄²⁻] = 0.010/(1.05 x 10⁻⁵)² = 87 M

Therefore, a concentration of at least 87 M of sulfate ion is required to begin precipitation of BaSO₄.

(b) When the concentration of sulfate ion reaches 0.015 M, the concentration of Ba₂⁺ remaining in solution can be calculated using the Ksp expression and the initial concentration of Ba₂⁺:

⇒               Ksp = [Ba₂⁺][SO₄²⁻]

⇒       1.1 x 10⁻¹⁰ = [Ba₂⁺](0.015)

⇒            [Ba₂⁺] = (1.1 x 10⁻¹⁰)/0.015

                         = 7.3 x 10⁻⁹ M

Therefore, the concentration of Ba₂⁺ remaining in solution is 7.3 x 10⁻⁹ M when the concentration of sulfate ion reaches 0.015 M.

The solubility product constant Ksp can be used to calculate the concentration of ions in solution at the point of precipitation of a sparingly soluble salt like BaSO₄. The concentration of Ba₂⁺ remaining in solution after precipitation begins can be calculated using the initial concentration of Ba₂⁺ and the concentration of sulfate ion in solution.

To know more about the Concentration, here

https://brainly.com/question/14985839

#SPJ4

Answer:

its ez

Explanation:

f=ma

Taking into account the reaction stoichiometry, 355 grams of Na₂SO₄ will be formed if you start with 200 grams of sodium hydroxide and you have an excess of sulfuric acid.

In first place, the balanced reaction is:

H₂SO₄ + 2 NaOH  → Na₂SO₄ + 2 H₂O

By reaction stoichiometry, the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

By reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

It can be applied the following rule of three: if by reaction stoichiometry 80 grams of NaOH form 142 grams of Na₂SO₄, 200 grams of NaOH form how much mass of Na₂SO₄?

mass of Na₂SO₄= (142 grams of Na₂SO₄×200 grams of NaOH) ÷80 grams of NaOH

mass of Na₂SO₄= 355 grams

Finally, 355 grams of Na₂SO₄ are formed.

Learn more about the reaction stoichiometry:

brainly.com/question/24741074

#SPJ1

The label(s) required for the transportation of 12 kg of UN1454 calcium nitrate on a passenger aircraft would include the UN number and the appropriate hazard warning labels.

When transporting hazardous materials on a passenger aircraft, specific labeling requirements must be followed to ensure safety. In the case of 12 kg of UN1454 calcium nitrate, there are certain labels that need to be applied to the packaging.

Firstly, the package should bear the UN number "UN1454," which is the unique identifier for calcium nitrate as designated by the United Nations. This number helps to identify the specific substance being transported.

Secondly, appropriate hazard warning labels should be affixed to the package. These labels typically include symbols and text indicating the hazards associated with the substance. In the case of calcium nitrate, which is considered an oxidizing substance, the appropriate hazard warning label would be the Class 5.1 Oxidizing Agent label.

These labels serve as visual indicators for handlers and transport personnel, highlighting the nature of the substance being transported and ensuring that proper precautions are taken during handling, loading, and unloading of the package on the passenger aircraft.

Learn more about calcium nitrate here

https://brainly.com/question/28188153

#SPJ11

Yes, there were significant changes observed when the Congo red fabric was treated with acid.

Congo red is a pH indicator dye that changes color depending on the acidity or alkalinity of the solution it is in. When the Congo red fabric is treated with an acid, the pH of the solution around the fabric decreases, causing the dye to shift from a reddish color to a blue-green color. This color change indicates a significant change in the pH level of the fabric, which can affect its properties and potential uses.

Thus, the observation of a color change in the fabric after treatment with acid can be considered a significant change.

To know more about acid refer here:

https://brainly.com/question/29796621#

#SPJ11

Answer: 9. decomposition 10. single displacement 11. synthesis 12. double displacement

Explanation: just know I know

The standard enthalpy change for reaction (3) is 117.1 kJ.

The standard enthalpy change for reaction (3) can be calculated by using the enthalpy changes of reactions (1) and (2) and applying Hess's Law.

To do this, we need to manipulate the given equations so that the desired reaction (3) can be obtained.

First, we reverse reaction (1) to get the formation of C2H4(g) from C2H6(g):

C2H4(g)C2H6(g) ΔH° = -52.3 kJ

Next, we multiply reaction (2) by 2 and reverse it to obtain 2 moles of C2H6(g) reacting to form 3 moles of H2(g):

2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

Now, we add the two modified equations together:

C2H4(g)C2H6(g) ΔH° = -52.3 kJ
2C2H6(g)2C(s) + 3H2(g) ΔH° = 169.4 kJ

When adding these equations, the C2H6(g) on the left side cancels out with the C2H6(g) on the right side, leaving us with the desired reaction (3):

C2H4(g) + H2(g)C2H6(g) ΔH° = -52.3 kJ + 169.4 kJ = 117.1 kJ

Learn more about standard enthalpy here :-

https://brainly.com/question/28303513

#SPJ11

Answer:

stars,auroras,a neon sign

Explanation:

just did it

The number of moles of CO2 in a 220 gram sample can be calculated by dividing the mass of the sample by the molar mass of CO2.

The molar mass of CO2 (carbon dioxide) is calculated by adding the atomic masses of carbon (C) and oxygen (O) in one mole of CO2. The atomic mass of carbon is approximately 12.01 grams/mol, and the atomic mass of oxygen is approximately 16.00 grams/mol (rounded values).

Therefore, the molar mass of CO2 is approximately 12.01 + (16.00 x 2) = 44.01 grams/mol. To determine the number of moles of CO2 in a 220 gram sample, divide the mass of the sample (220 grams) by the molar mass of CO2 (44.01 grams/mol). The result will be the number of moles of CO2 in the given sample.

To learn more about molar mass click here :

brainly.com/question/30640134

#SPJ11

Two mean unpaired is the type of hypothesis test you should use. If the caloric contents were normally distributed, and that a level of significance of 1% be used you should use two mean unpaired hypothesis test. Option B is correct.

13: Since you have two independent groups (1.5 moles per liter and 2.0 moles per liter), and you want to compare the means of these two groups, you would use a Two mean unpaired hypothesis test. This test compares the means of two independent groups to determine if there is a significant difference between them.

Therefore, Option B is correct.

15: Since you have two independent groups (Type A milk and Type B milk) you would also use a Two mean unpaired hypothesis test.

Therefore, Option B is correct.

Learn more about hypothesis -

brainly.com/question/12416923

#SPJ11

If the car now accelerates from 0 m/s to 30. 0 m/s in 5. 00 s. If the wheels have a radius of 24. 1 cm, then their angular acceleration is 24.9 rad/s².

To calculate the angular acceleration of the car's wheels, we need to first find their angular velocity. We know that the car accelerates from 0 m/s to 30.0 m/s in 5.00 s, so we can calculate the average acceleration:

a = (vf - vi)/t = (30.0 m/s - 0 m/s)/5.00 s = 6.00 m/s²

Next, we can use the formula for linear acceleration in terms of angular acceleration and radius:

a = αr

where α is the angular acceleration and r is the radius of the wheels. Solving for α, we get:

α = a/r = 6.00 m/s² / 0.241 m = 24.9 rad/s²

Therefore, the angular acceleration of the car's wheels is 24.9 rad/s².

To know more about the angular acceleration refer here :

https://brainly.com/question/30238727#

#SPJ11

Answer:

The alkali metals (Li, Na, K, Rb, Cs, and Fr) are the most reactive metals in the periodic table – they all react vigorously or even explosively with cold water, resulting in the displacement of hydrogen.

Explanation:

The metal that reacted most vigorously when placed in the acid is sodium, as it is an alkali metal.

At standard temperature and pressure, all of the bright, soft, extremely reactive alkali metals rapidly shed their outermost electron to create cations with charge +1.

One of the most reactive metals is the alkali metal. They have greater atomic radii and low ionization energies, which contribute to this. They have an oxidation state of 1, and they frequently give electrons during reactions. These metals stand out for their supple texture and silvery hue.

The alkali metals (Li, Na, K, Rb, Cs, and Fr) are the most reactive metals in the periodic table – they all react vigorously or even explosively with cold water, resulting in the displacement of hydrogen.

Therefore, the correct option is d. sodium.

To learn more about alkali metals, refer to the link:

https://brainly.com/question/18153051

#SPJ2

The question is incomplete. Your most probably complete question is given below:

Oxygen

magnesium

iron

sodium

The velocity of the reaction under the given condition is 40% of Vmax. So the answer is 40%

Given: The reaction A → B is catalyzed by an enzyme that follows Michaelis-Menton kinetics.

If the initial rate of the reaction is measured under conditions where [A] = 2/3Km, at

We are supposed to determine the percentage of Vmax for the reaction which is catalyzed by an enzyme that follows Michaelis-Menton kinetics.

Let us first write down the equation for Michaelis-Menton Kinetics: V = Vmax * [S]/([S] + Km )Initial velocity of the reaction can be calculated using the Michaelis-Menton equation.

When [S] = Km, V=Vmax/2When [S] = 2Km, V=Vmax(2/3)Vmax is the maximum velocity attained by the reaction.

Therefore the percentage of Vmax for the reaction under the given conditions

where [A] = 2/3Km can be calculated as follows:[A] = 2/3Km  => [S] = 2/3Km

Substituting the values in the Michaelis-Menton equation: V = Vmax * [S]/([S] + Km )

V = Vmax * (2/3Km) / [(2/3Km) + Km]

V = Vmax * (2/3) / (5/3) = 2/5

Vmax, Therefore, the velocity of the reaction under the given condition is 40% of Vmax. So the answer is 40%.

to know more about Michaelis-Menton kinetics here:

brainly.com/question/31561517

#SPJ11

Answer:

1 would be a. sequence

2 would be b. compare and contrast

3 would be a. cause and effect

a)The concentration of NaOH in g/dm³ is approximately 18.18 g/dm³, and b)The concentration in mol/dm³ is approximately 0.4545 mol/dm³.

a)To calculate the concentration of NaOH in g/dm³ (grams per cubic decimeter) and mol/dm³ (moles per cubic decimeter), we need to know the amount of NaOH used in the reaction and the volume of the NaOH solution.

From the given information, we have:

Volume of NaOH solution = 27.5 cm³

Volume of HCl solution = 25.0 cm³

Molarity of HCl solution = 0.5 M

Since the reaction between NaOH and HCl is a 1:1 stoichiometric ratio, the moles of NaOH used can be determined from the moles of HCl used:

Moles of HCl = Molarity × Volume = 0.5 M × 25.0 cm³ = 12.5 mmol (millimoles)

Since the moles of NaOH used is also equal to the moles of HCl, we have:

Moles of NaOH = 12.5 mmol

b)To calculate the concentration of NaOH in g/dm³, we need to convert moles to grams using the molar mass of NaOH, which is approximately 40 g/mol:

Mass of NaOH = Moles × Molar mass = 12.5 mmol × 40 g/mol = 500 g

Now, we can calculate the concentration in g/dm³:

Concentration of NaOH (g/dm³) = Mass of NaOH / Volume of NaOH solution

= 500 g / 27.5 cm³

≈ 18.18 g/dm³

To calculate the concentration of NaOH in mol/dm³, we can use the same approach:

Concentration of NaOH (mol/dm³) = Moles of NaOH / Volume of NaOH solution

= 12.5 mmol / 27.5 cm³

≈ 0.4545 mol/dm³

Therefore, the concentration of NaOH in g/dm³ is approximately 18.18 g/dm³, and the concentration in mol/dm³ is approximately 0.4545 mol/dm³.

Know more about    concentration  here:

https://brainly.com/question/28464162

#SPJ8

The substance in the image above would be classified as a mixture of elements (option E).

A compound is a substance formed by chemical bonding of two or more elements in definite proportions by weight.

On the other hand, a mixture is made when two or more substances are combined, but they are not combined chemically.

According to this question, an image is shown with two different substances or elements as distinguished by coloration (white and purple). These elements are combined but not chemically bonded, hence, is a mixture.

Learn more about mixture at: https://brainly.com/question/12160179

#SPJ1

In a new social setting, strangers usually. experience very few situations as potentially problematic lack the natives' knowledge of shared realities are not aware of things unnoticed by the natives are typically treated as equals with natives

Based on the given answer choices, the most appropriate answer is a. Strangers experience very few situations as potentially problematic. In a new social setting, strangers typically encounter unfamiliar situations and interactions.

They may not have prior knowledge or shared realities of the environment or the people they are interacting with. However, it doesn't necessarily mean that every situation is perceived as potentially problematic.

While it is true that strangers may lack the natives' knowledge of shared realities and may not be aware of certain things unnoticed by the natives, it does not imply that all situations are problematic. People entering new social settings often exhibit curiosity, adaptability

The behavior of strangers in a new social setting can vary depending on individual personalities, cultural backgrounds, and previous experiences. While some individuals may feel discomfort or hesitation in unfamiliar situations, others may embrace the opportunity to connect with new people and explore different social dynamics

Know more about  social setting here:

https://brainly.com/question/30618835

#SPJ11

Answer:

the material has two different color crystals

Explanation:

There are two types of mixture, one is homogeneous mixture and other is heterogeneous mixture. Therefore, If the material has two different color crystals, then we can see  whether material is a pure substance or a mixture.

When two or more compounds are combined but each ingredient retains its chemical identity, the result is referred to as a mixture. In other words, there is no chemical interaction between the parts of a combination.

According to how consistent they are and how well the components' particle sizes match up, mixtures are categorized. If the material has two different color crystals, then we can see  whether material is a pure substance or a mixture.

Therefore, if the material has two different color crystals, then we can see  whether material is a pure substance or a mixture.

To know more about mixture, here:

https://brainly.com/question/12160179

#SPJ6

Answer: Most likely around the knob area or by the bolts that hold the door up.

Explanation:

If you attempted to pry open a locked window with a screwdriver, the screwdriver would leave a tool mark on the window and windowsill.

The impressions made by a tool when it comes in contact with an object are called as tool marks. These tool marks exhibit a variety of impressions depending upon the type of tool, its shape and its use. They are classified into different types depending upon the force with which they are made.

The study of tool marks is very useful in forensic science which includes information about the analysis of tool marks at the crime scene and in the laboratory, the interpretation and assessment of challenges for examination and interpretation and also the way in which tool mark evidence can be presented in a courtroom.

Learn more about Tool marks, here:

https://brainly.com/question/32257286

#SPJ2

Coal is abundant and cost-effective, providing stable energy.

Coal extraction damages the environment, and burning it releases high levels of CO2 and air pollutants. Oil has high energy density and infrastructure, but its combustion contributes to climate change and spills cause environmental harm.

Natural gas emits less CO2, is versatile, and is abundant, but extraction techniques like fracking can harm ecosystems and water resources. Nuclear power produces large amounts of electricity without CO2 emissions but faces concerns about radioactive waste disposal and safety risks. Biomass is renewable but competes with food production and can release emissions.

Wind, solar, hydro, and geothermal offer renewable sources, but their scalability, intermittency, and land use impacts vary. Per capita, consumption affects the magnitude of their environmental effects.

For more details regarding coal, visit:

https://brainly.com/question/30560160

#SPJ1

Answer:

Phosphorus

Explanation:

Melting point is the exact temperature where it changes from solid to liquid. So if the temp 50°C, it is higher than 44°C meaning that the element already melted and is staying as a liquid.

Boiling point is the exact temperature where it changes from liquid to gas. So if the temp 300°C, it is higher than 28°C meaning that the element already evaporated and is staying as a gas.

Answer:

866000

Explanation:

because one kilometer (km) = 1000000 millimeters (mm)

The amount of chlorine added to water minus its chlorine residual equals: b) The chlorine demand

The difference between the amount of chlorine applied to water or wastewater and the amount of residual chlorine left after a specific contact time is known as chlorine demand. With dosage, time, temperature, pH, and the kind and quantity of contaminants in the water, chlorine demand may alter.

Chlorine Demand = Chlorine Applied - Chlorine Residue

The correct answer is, The amount of chlorine added to water minus its chlorine residual equals: b) The chlorine demand

To know more about chlorine click here:

https://brainly.com/question/30831426

#SPJ11

Answer:

1 mol of atoms = 6.022 ×1023 atoms. 3.5mol × 6.022 × 1023 atoms 1mol = 2.11 × 1024 atoms =.........

Explanation:

2160.64 atoms!