Question 25.36 - Level 2 HomeworkUnanswered Which compound will react with phosgene to produce the following polycarbonate? Select an answer and submit. For keyboard navigation, use the up/down arrow keys to select an answer. a 1,2-Propanediol b 1,3-Propanediol c 1,2-Ethanediol d 1,2-Diaminoethane

Answer:

Hydrophobic molecules and surfaces repel water. Hydrophobic liquids, such as oil, will separate from water. Hydrophobic molecules are usually nonpolar, meaning the atoms that make the molecule do not produce a static electric field.

Answer:

force had thrown the object with more

Answer:

If an object is in motion and more force is applied to it, the object will begin moving faster

Explanation:

don't have any (sorry:[ )

The question requires us to calculate the mass necessary to prepare a lead(II) nitrate (Pb(NO3)2) solution, given the volume of the solution and its molar concentration.

The following information was provided by the question:

salt used = Pb(NO3)2

volume of solution = V = 750.0 mL = 0.7500 L

molar concentration of solution = C = 0.20 mol/L

To solve this problem, we'll use two important definitions and their equations: the molar concentration and number of moles.

The molar concentration (C, given in mol/l) is defined as the number of moles of a compound (n, given in moles) divided by the volume of the solution (V, given in liters):

On the other hand, the number of moles of a substance (n, given in moles) can be calculated by dividing the mass of this substance (m, given in grams) by its molar mass (M, given in g/mol):

If we replace n as given by the second equation in the first equation, we'll have:

And, rearranging this last equation, we find an expression to calculate the mass of a substance from the molar concentration of a solution, its volume and the molar mass of the substance:

(where m is the mass, in g, C is the molar concentration, in mol/L, M is the molar mass, in g/mol, and V is the volume, in L).

Since the question provided the values for C and V, we'll only need the molar mass of Pb(NO3)2.

The atomic masses of Pb, N and O are 207.2 u, 14.01 u and 15.99 u, respectively. Thus, the molar mass of Pb(NO3)2 can be calculated as:

molar mass Pb(NO3)2 = (1 * 207.2) + (2 * 14.01) + (6 * 15.99) = 331.2 g/mol

Next, we apply the values of to the equation to calculate the mass of Pb(NO3)2:

Therefore, the mass of Pb(NO3)2 required to prepare 750.0 mL of a 0.20 M solution is 49.68 g.

One mole of H₂S gas contains 6.022 × 10²³ H₂S molecules. Hence, 2.50 mol of H₂S contains 1.50 × 10²⁴ molecules. Thus, option A is correct.

Any substance containing 6.022 × 10²³ number of atoms is called one mole of that substance. This number is called Avogadro number. Thus, one mole every elements contains Avogadro number of atoms.

Similarly a compound is made of molecules. One mole of a compound contains 6.022 × 10²³ number of molecules. The mass of a compound with Avogadro number of molecules is called its molar mass.

As any other compound, one mole of H₂S contains 6.022 × 10²³ molecules. Therefore, the number of molecules in 2.50 moles of H₂S is :

2.50 moles × 6.022 × 10²³ molecules/mol =  1.50 × 10²⁴molecules

Hence, the number of molecules present in 2.50 moles of H₂S is  1.50 × 10²⁴.

To find more on Avogadro number, refer here:

https://brainly.com/question/11907018

#SPJ6

The empirical formula for barium azide is BaN6 as it is a barium salt of hydrazoic acid.

The empirical formula of a chemical compound in chemistry is the simplest whole number ratio of atoms present in the compound.

Barium azide, with the formula Ba(N3)2, is an inorganic azide. It is a hydrazoic acid barium salt. It is explosive, as are most azides.

Thus, it can be implicated that the empirical formula for barium azide will be BaN6.

For more details regarding empirical formula, visit:

https://brainly.com/question/14044066

#SPJ1

Answer:

A

Explanation:

because the charge of Li ion is +1 well I don't know the explanation yet but I'm sure about the answer

The reaction between 2-bromo-2-methylpropane (commonly known as tert-butyl bromide) and CH3-CH2-OH (ethanol) results in the formation of two products: tert-butyl ethyl ether and hydrogen bromide. The reaction mechanism involved is nucleophilic substitution.

1. Nucleophilic Substitution: Ethanol (CH3-CH2-OH) acts as a nucleophile and replaces the bromine atom in tert-butyl bromide (2-bromo-2-methylpropane) through a nucleophilic substitution reaction.

2. Product 1: The condensed structural formula for tert-butyl ethyl ether (also known as ethoxy-tert-butane) is (CH3)3COCH2CH3. This compound is formed when the ethoxy group (CH3-CH2-O-) of ethanol replaces the bromine atom in tert-butyl bromide.

3. Product 2: Hydrogen bromide (HBr) is formed as a byproduct of the reaction. Its condensed structural formula is HBr.

Therefore, the products of the reaction between 2-bromo-2-methylpropane and CH3-CH2-OH are tert-butyl ethyl ether [(CH3)3COCH2CH3] and hydrogen bromide (HBr). The reaction mechanism involved is nucleophilic substitution.

Learn more about nucleophilic substitution from the given link: https://brainly.com/question/30633020

#SPJ11

Answer:

Concept of chemi-fluorescence

Explanation:

A glow stick usually consists of two chemicals in a larger plastic tube: , a base catalyst (mostly sodium salicylate), and a suitable dye (sensitizer, or fluorophor). This creates an exergonic reaction when mixed together.

When a glow stick is bent, the flurophor which is a chemical that easily re-emits light upon excitation in smaller capsules is released into the other substance, there by causing it to emit radiation/light in the uv-visible region. The brightness and longevity of the glow stick is determined by varying the concentration of these chemicals.

I hope this explanation clarifies things.

Answer:

a compound different from a molecule?

Molecule is a substance with two or more atoms bonded together such as the oxygen humans breathe (O2). Elements are pure substances made up of all the same atoms such as gold (Au), hydrogen (H), and oxygen (O). ... Compounds are two or more elements bonded together such as table salt (NaCl).

Explanation:

hope this helps

Answer:

they are diffrent by the way that atoms bind togther

Explanation:

if the atom is a diffrent structure thier diffrnt componds

Answer:

Properties: The melting point of phosphorus (white) is 44.1°C, boiling point (white) is 280°C, specific gravity (white) is 1.82, (red) 2.20, (black) 2.25-2.69, with a valence of 3 or 5. There are four allotropic forms of phosphorus: two forms of white (or yellow), red, and black (or violet).Oct 7, 2019

Atomic Number: 15

Atomic Weight: 30.973762

Explanation:

: )

Answer:

Properties: The melting point of phosphorus

Atomic Number: 15

Atomic Weight: 30.973762

Discovery: Hennig Brand, 1669 (Germany)

The species that will react strongly with one another are the acid HA and the base NaA. The pH of the final solution can be calculated by considering the Henderson-Hasselbalch equation.

a) The acid HA and the base NaA will react strongly with one another. HA will donate a proton (H+) to NaA, forming the corresponding conjugate base A- and releasing water. This reaction occurs because HA is a weak acid and NaA is its corresponding conjugate base.

b. To calculate the pH of the final solution, we need to consider the Henderson-Hasselbalch equation, which is pH = pKa + log([A-]/[HA]). Given that the pKa of HA is 4.82 and the initial concentrations of HA and A- are 0.10 M and 0.20 M, respectively, we can plug these values into the equation.

pH = 4.82 + log(0.20/0.10) = 4.82 + log(2) = 4.82 + 0.30 = 5.12

Therefore, the pH of the final solution will be approximately 5.12.

To know more about protons click here: brainly.com/question/30895149

#SPJ11

Answer: False

Explanation: The moon travels at 1.42 mph around the Earth.

Answer:

false

Explanation:

Answer: C

Explanation:

A. color.

B. boiling point.

C. flammability.

D. taste.

E. density. is this the whole question

The optimum pH range for blood is approximately 7.35 to 7.45. Deviations from this range can have serious consequences on physiological processes. The body employs three mechanisms to control pH: buffers, respiratory regulation, and renal regulation. Blood plays a crucial role in maintaining pH homeostasis by utilizing these mechanisms.

The optimum pH range for blood is tightly regulated between 7.35 and 7.45. If the blood pH deviates from this range, it can disrupt normal physiological processes. For example, if the blood becomes too acidic (pH below 7.35), a condition called acidosis occurs.

Acidosis can lead to impaired enzyme function, decreased oxygen delivery to tissues, and disruption of the central nervous system. On the other hand, if the blood becomes too alkaline (pH above 7.45), a condition called alkalosis occurs. Alkalosis can result in muscle twitching, confusion, and even seizures.

To maintain the pH within the optimal range, the body employs three primary mechanisms: buffers, respiratory regulation, and renal regulation. Buffers are chemical substances that can accept or donate hydrogen ions to resist changes in pH. They can bind excess hydrogen ions when blood becomes acidic or release hydrogen ions when blood becomes alkaline.

The respiratory system regulates pH by adjusting the levels of carbon dioxide (\(CO_{2}\)) in the blood through changes in breathing rate and depth. By altering the amount of \(CO_{2}\), the body can regulate the concentration of carbonic acid (\(H_{2}\)\(CO_{3}\)) and thus control pH. The kidneys play a crucial role in long-term pH regulation by selectively reabsorbing or excreting bicarbonate ions (\(HCO_{3}\)-) and hydrogen ions (H+) in the urine.

Hence, the optimum pH range for blood is approximately 7.35 to 7.45. Deviations from this range can lead to acidosis or alkalosis, disrupting physiological processes. The body controls pH through buffers, respiratory regulation, and renal regulation. Buffers resist pH changes, the respiratory system regulates \(CO_{2}\) levels to control carbonic acid concentration, and the kidneys selectively reabsorb or excrete bicarbonate and hydrogen ions to maintain pH homeostasis.

Learn more about pH

https://brainly.com/question/12609985

#SPJ11

Answer:

Principle of Original Horizontality

One of the most frequent methods of exposure to beryllium is through e. workers' inhalation of beryllium in metal processing industries. Beryllium is commonly used in various industrial processes, such as metal machining, foundry work, and alloy production.

During these activities, fine particles or fumes containing beryllium can be generated and released into the air.

Inhalation of airborne beryllium particles is considered the primary route of exposure in occupational settings. Workers who are involved in tasks that generate beryllium-containing dust or fumes may inhale these particles, which can enter the respiratory system and potentially reach the lungs. Once inhaled, beryllium can pose a health risk and may lead to the development of lung diseases, such as chronic beryllium disease (CBD).

While other routes of exposure to beryllium, such as direct skin contact or ingestion, are possible, they are generally less frequent compared to inhalation in occupational settings. Direct skin contact or ingestion of beryllium may occur in certain situations, such as handling beryllium-containing materials without proper protective measures or accidental ingestion of contaminated substances. However, the primary concern for exposure to beryllium remains through inhalation in metal processing industries where beryllium is utilized.

To know more about Beryllium

brainly.com/question/20669804

#SPJ11

Answer:

If a Maritime Tropical Air mass begins in the Southern United States and keeps traveling North directly over the central USA, it will turn into a polar air mass.

Explanation:

because Northern USA is colder than the South :)

Answer:

C

Explanation:

First of all KE is an energy that measures velocity, so the object has to be moving.

That lets out both A and D.  When the car is at it's highest it must stop so it can change direction. In both A and D, the car is getting ready to fall.  

B has some KE because the car is moving but it is not the answer.

The answer is C.  The car has turned all the PE it had at point A into KE

The answer then is C

Question B

The car is at a minimum when it is not moving. The velocity is 0. So that's at A and D. Both places have a velocity of 0.

Answer:

copper

Explanation:

so for this you can work out the mass for both and compare

so mass = moles × mr

so mass of sodium = 1 × 23= 23 g

and mass of copper = 1 × 63.5= 63.5 g

so copper have more mass :)

Answer:

The outermost shell of helium for example is filled with only two electrons. Hydrogen and lithium become stable by acquiring the electronic configuration of the nearest inert gas, which is helium. This is the duplet (or duet) rule.

Explanation:

Answer:

RBCs are disc-shaped with a flatter, concave center. This biconcave shape allows the cells to flow smoothly through the narrowest blood vessels. ... Many RBCs are wider than capillaries, but their shape provides the needed flexibility to squeeze through

Answer:

The activation energy for the forward reaction is the amount of free energy that must be added to go from the energy level of the reactants to the energy level of the transition state. ... Once a reactant molecule absorbs enough energy to reach the transition state, it can proceed through the remainder of the reaction.

Explanation:

Answer: Activation energy is how much energy it takes for a reaction to occur.

Explanation:

The standard entropy change for the reaction \(2Mg(s)+O_2(g)\rightarrow 2MgO(s)\) is -405.6 J/(K⋅mol).

Entropy is a measure of the randomness or disorder in a system. It is a thermodynamic property that can be used to measure the amount of energy that is unavailable for work in a thermodynamic process. Entropy is closely related to the second law of thermodynamics and can be used to assess the direction of a thermodynamic process. Entropy is also a measure of the amount of information contained in a system. High entropy systems have more randomness and disorder, while low entropy systems have less.

The entropy change for the reaction \(2Mg(s)+O_2(g) \rightarrow 2MgO(s)\) is calculated using the following equation: \(\Delta S^\circ = \Sigma S^\circ products -\Sigma S^\circ reactants\)

Substituting the values from the table:

\(\Delta S^\circ = (2 \times 27.00 J/(Kmol)) - (32.70 J/(Kmol) + 205.0 J/(Kmol))\\\Delta S^\circ = -405.6 J/(Kmol) .\)

To learn more about entropy

https://brainly.com/question/419265

#SPJ4

Explanation:

4.1 The Chemical Equation

LEARNING OBJECTIVES

Define chemical equation.

Identify the parts of a chemical equation.

A chemical reaction expresses a chemical change. For example, one chemical property of hydrogen is that it will react with oxygen to make water. We can write that as follows:

hydrogen reacts with oxygen to make water

We can represent this chemical change more succinctly as

hydrogen + oxygen → water

where the + sign means that the two substances interact chemically with each other and the → symbol implies that a chemical reaction takes place. But substances can also be represented by chemical formulas. Remembering that hydrogen and oxygen both exist as diatomic molecules, we can rewrite our chemical change as

H2 + O2 → H2O

This is an example of a chemical equation, which is a concise way of representing a chemical reaction. The initial substances are called reactants, and the final substances are called products.

Unfortunately, it is also an incomplete chemical equation. The law of conservation of matter says that matter cannot be created or destroyed. In chemical equations, the number of atoms of each element in the reactants must be the same as the number of atoms of each element in the products. If we count the number of hydrogen atoms in the reactants and products, we find two hydrogen atoms. But if we count the number of oxygen atoms in the reactants and products, we find that there are two oxygen atoms in the reactants but only one oxygen atom in the products.

What can we do? Can we change the subscripts in the formula for water so that it has two oxygen atoms in it? No; you cannot change the formulas of individual substances because the chemical formula for a given substance is characteristic of that substance. What you can do, however, is to change the number of molecules that react or are produced. We do this one element at a time, going from one side of the reaction to the other, changing the number of molecules of a substance until all elements have the same number of atoms on each side.

To accommodate the two oxygen atoms as reactants, let us assume that we have two water molecules as products:

H2 + O2 → 2H2O

The 2 in front of the formula for water is called a coefficient. Now there is the same number of oxygen atoms in the reactants as there are in the product. But in satisfying the need for the same number of oxygen atoms on both sides of the reaction, we have also changed the number of hydrogen atoms on the product side, so the number of hydrogen atoms is no longer equal. No problem—simply go back to the reactant side of the equation and add a coefficient in front of the H2. The coefficient that works is 2:

2H2 + O2 → 2H2O

There are now four hydrogen atoms in the reactants and also four atoms of hydrogen in the product. There are two oxygen atoms in the reactants and two atoms of oxygen in the product. The law of conservation of matter has been satisfied. When the reactants and products of a chemical equation have the same number of atoms of all elements present, we say that an equation is balanced. All proper chemical equations are balanced. If a substance does not have a coefficient written in front of it, it is assumed to be 1. Also, the convention is to use all whole numbers when balancing chemical equations. This sometimes makes us do a bit more “back and forth” work when balancing a chemical equation.

Answer

A

Explanation

letter a kase tama

Answer: A. The sun's gravity is stronger.

Explanation: Gravity has to do with 2 factors, the mass of the object and the distance between the 2 objects.

The Sun's mass is immensely larger than the Earth's mass, so the sun's gravity would be stronger.

Answer:

nu

Explanation:

It has five naturally occurring stable isotopes. The most common stable isotope of zinc is Zn-64. Zn-64 has such a long half-life that it radioactive properties are virtually non-existant. ... Zinc is a hard metal, but becomes very malleable above 100 degrees Celsius.

Answer:

160 grams is equal to 160,000 milligrams.

Explanation:

Please like and mark brainliest!

Hope it helps!

Answer:

1g=1000mg

160g=160000

The correct options are:1.

Conditional probability that the selected compound actually has an impurity is 0.74.2.

Conditional probability that the selected compound is actually free of an impurity is 0.0185.3.

Conditional probability that the selected roll is from Process I given that it is defective is 0.64.

Here, we need to find out the probability that a selected compound has an impurity given that the test indicates an impurity is present.

P(A) = probability that a compound has impurity = 0.15

P(B) = probability that the test indicates an impurity is present

= 0.15 x 0.9 + 0.85 x 0.05

= 0.14 + 0.0425

= 0.1825P

(B|A) = probability that the test indicates an impurity is present given that the compound has impurity = 0.9

Therefore, by Bayes' Theorem,

P(A|B) = P(B|A) * P(A) / P(B)

         = 0.9 * 0.15 / 0.1825

         = 0.7370

         ≈ 0.74

Conditional probability that the selected compound actually has an impurity is 0.74.10.

Here, we need to find out the probability that a selected compound is actually free of an impurity given that the test indicates an impurity is not present.

P(A) = probability that a compound has impurity = 0.15

P(B) = probability that the test indicates an impurity is not present = 0.85 x 0.95 + 0.15 x 0.1 = 0.8075

P(B|A) = probability that the test indicates an impurity is not present given that the compound has impurity

          = 0.1

Therefore, by Bayes' Theorem,

P(A|B) = P(B|A) * P(A) / P(B)

          = 0.1 * 0.15 / 0.8075

          = 0.0185

Conditional probability that the selected compound is actually free of an impurity is 0.0185.11.

Here, we need to find out the probability that the selected roll is from Process I given that it is defective.

Let A denote the event that a roll is from Process I and B denote the event that a roll is defective.

Then, we need to find out P(A|B).

P(A) = probability that a roll is from Process I = 0.6

P(B|A) = probability that a roll is defective given that it is from Process I = 0.03

P(B|A') = probability that a roll is defective given that it is from Process II = 0.01

P(A'|B) = probability that a roll is from Process II given that it is defective

Therefore, by Bayes' Theorem,

P(A|B) = P(B|A) * P(A) / [P(B|A) * P(A) + P(B|A') * P(A')]

= 0.03 * 0.6 / (0.03 * 0.6 + 0.01 * 0.4)

= 0.6429

≈ 0.64

Conditional probability that the selected roll is from Process I given that it is defective is 0.64.

Hence, the correct options are:1.

Conditional probability that the selected compound actually has an impurity is 0.74.2.

Conditional probability that the selected compound is actually free of an impurity is 0.0185.3.

Conditional probability that the selected roll is from Process I given that it is defective is 0.64.

Learn more about  impurity from this link:

https://brainly.com/question/14932983

#SPJ11

Explanation:

They are both in shell 5 and subshell s.

Since s only has 1 orbital, they also have the same orbital number.

But they have different magnetic spins.

Hence 3 out of 4 quantum numbers are in common.