13
Which one is heavier? 1 mole of Pbd,, 1 mole
of H, and 1 mole of Pb(NO3)2
A. Pbd
В. Н,
C. С None of them
D. Pb(NO3)2​

This polynomial is in standard form because the powers of x are in descending order and there are no like terms that can be combined.

A fourth-degree polynomial with two terms in standard form can be written as:

\(ax^4 + bx^2\)

where "a" and "b" are constants and "x" is the variable raised to powers of 4 and 2.

This polynomial is in standard form because the terms are arranged in descending order of degree and the coefficients of each term are written in front of the corresponding power of x. Additionally, there are no like terms that can be combined further.

To create such a polynomial, we can choose any values for "a" and "b". For example, let's say a = 2 and b = -3. Then, the polynomial can be written as:

\(2x^4 - 3x^2\)

This polynomial is in standard form because the powers of x are in descending order and there are no like terms that can be combined.

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In order to determine the pH in the given scenarios, several calculations and considerations need to be taken into account.Firstly, the Henderson-Hasselbalch equation can be used, which relates the pH of a solution to the pKa of the acid and the ratio of its conjugate base to the acid. This equation is pH = pKa + log([A-]/[HA]), where [A-] is the concentration of the conjugate base and [HA] is the concentration of the acid.

The first problem asks for the pH of a solution made by mixing 0.20 mol of acid HA with 0.30 mol of its conjugate base NaA. The pH can be calculated using the Henderson-Hasselbalch equation, pH = pKa + log([A-]/[HA]). Given that the pKa is 6, we can plug in the values and solve for the pH.

The second problem asks for the pH after adding 0.05 mol of NaOH to the previous solution. Since NaOH is a strong base, it will react with the acid HA and form water.

The amount of NaOH added is small compared to the amount of acid, so we can assume that the acid will be fully neutralized. We can calculate the resulting concentration of the acid and its conjugate base and use the Henderson-Hasselbalch equation to find the new pH.

The third problem involves mixing 200 mL of 0.20 M HA with 300 mL of 0.30 M NaA. We need to calculate the concentrations of the acid and its conjugate base after mixing, and then use the Henderson-Hasselbalch equation to find the pH.

The fourth problem asks for the pH after adding 10 mL of 0.50 M HCl to the previous solution. Since HCl is a strong acid, it will completely dissociate and increase the concentration of the acid HA.

We need to calculate the new concentrations of the acid and its conjugate base and use the Henderson-Hasselbalch equation to find the new pH.

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Answer:

C

water has undergone a phase change and the composition of a substance was not changed

The Heisenberg uncertainty principle is true at the atomic level because  we cannot simultaneously determine the accuracy of both velocity and the position of a particle.

Heisenberg's Uncertainty Principle states that there is inherent uncertainty in the act of measuring a variable of a particle.

The Heisenberg uncertainty principle was found to be contrary to classical Newtonian physics which stipulates that all variables of particles to be measurable to an arbitrary uncertainty given standard equipment.

The Heisenberg uncertainty principle is true at the atomic level because  we cannot simultaneously determine the accuracy of both velocity and the position of a particle.

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Answer:

Mass of oxygen required = 19.5 moles × 16 g/mol = 312 g.

Explanation:

Answer:

1. 4 km

2. 40 minutes

3. 5 minutes for each km

rlly hope this helps:)

The heat flow in this chemical reaction is 1379.4 Joules.

To calculate the heat flow in this chemical reaction, we can use the equation:

Heat flow = mass × specific heat capacity × change in temperature

Given:

Mass of water = 50.0 g

Specific heat capacity of water = 4.18 J/g·°C

Initial temperature = 20.0°C

Final temperature = 26.6°C

First, we need to calculate the change in temperature:

Change in temperature = Final temperature - Initial temperature

Change in temperature = 26.6°C - 20.0°C

Change in temperature = 6.6°C

Next, we can substitute the values into the heat flow equation:

Heat flow = 50.0 g × 4.18 J/g·°C × 6.6°C

Calculating the heat flow:

Heat flow = 1379.4 J

Therefore, the heat flow in this chemical reaction is 1379.4 Joules.

The heat flow represents the amount of energy transferred as heat in a chemical reaction or process. In this case, we are calculating the heat flow in water. By multiplying the mass of water (50.0 g) by the specific heat capacity of water (4.18 J/g·°C) and the change in temperature (6.6°C), we obtain the heat flow in Joules.

It's important to note that the specific heat capacity of water is approximately 4.18 J/g·°C, but this value can vary slightly with temperature. This calculation assumes that the specific heat capacity remains constant over the given temperature range.

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Answer: A

Explanation: Based on the Law of conservation of mass the total mass of the reactants will equal to the total mass of the products. This happens as matter is not destroyed.

Answer:

+ 2 degrees Fahrenheit

Explanation:

Answer:

your answer is option c

Explanation:

you see by principles first fill low energy I.e. 2s and then fill p orbital with hunds rule so you first give each orbital one electron and come to first as there are 4 electrons for oxygen it is option c and not d

Answer:

A heat engine is a type of engine, (like the motor in a car) that produces ... Heat engines do just the opposite; they take the energy from being warm ... using a flame to heat water into steam, then using the steam to turn a turbine. ... is the percentage of energy input that the engine can convert to useful work.

Explanation:

hope this helps

and i hope its right

Answer:

The answer is D

The last one

Answer:

Polymerisation is the chemical process of monomers joining together to form polymers, often it takes many thousands of monomers to make a single polymer.

Explanation:

Answer:

13.25 M

Explanation:

Molarity is moles over liters so simply plug your values in as such:

5.30 mol ÷ 0.400 L = 13.25 M

ionic radius of magnesium anions is much larger than the radius of neutral magnesium  atoms.

An atom with a positive or negative electric charge is known as an ion. An atom on the periodic table becomes a cation when one of its electrons is lost. In contrast, an atom in the periodic table becomes an anion when it obtains an electron. The ionic radius, which is the radius an element's neutral atom has, can easily be slightly lower or bigger than the atomic radius.

On the periodic table, cations are formed by the majority of metals. For instance, all of the metals in group 1A (Alkali Metals) have a +1 charge, which indicates that they are eager to throw one electron away. The non-metals frequently develop into anions.

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Trans-cinnamic acid has one chirality center, which is the carbon atom that is directly attached to the carboxylic acid group (-COOH). This carbon atom is sp² hybridized and has three different groups attached to it: a hydrogen atom, a double bond with an adjacent carbon, and a carboxylic acid group.

Due to this, two stereoisomers are possible for trans-cinnamic acid: (E)-cinnamic acid and (Z)-cinnamic acid. The (E)-isomer has the two highest priority groups (i.e., the double bond and the carboxylic acid group) on opposite sides of the double bond, whereas the (Z)-isomer has them on the same side of the double bond.

Both isomers have the same chirality center, but they differ in their geometric arrangement around the double bond. Therefore, cinnamic acid exists in two stereoisomeric forms, (E)-cinnamic acid and (Z)-cinnamic acid.

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The symbol for the element represented by M in the metal oxide with the formula M₂O is where M is Cu.

Metal oxides are chemical compounds composed of metals and oxygen. Metal oxides are abundant in nature, and many of them are widely utilized in different fields.

Moles O = 11.18 / 15.9994 g/mol =0.6988

Mass M = 100 - 11.18 = 88.82 g

because the formula is M₂O

moles M = 2 x 0.6988 = 1.40

atomic weight M = 88.82 g/ 1.40 = 63.4 g/mol

M is copper and the formula is Cu₂O

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#1: A covalent bond

#2 False

#3True

The endocrine system is a complex system of glands and hormones that regulate many bodily functions and maintain homeostasis. Homeostasis refers to the body's ability to maintain a stable internal environment despite changes in the external environment. One example of the endocrine system maintaining homeostasis is the regulation of blood sugar levels by the pancreas.

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Answer:

By not playing with sharp objects.

By not running on a slippery floor.

By not jumping on the desks and benches.

Explanation:

Hang safety posters in common areas such as the lunchroom, and office, near the restrooms and in the front hallway. Implement safety training for all students. Ask teachers to conduct classroom safety training based on the rules.

Answer:

I don't know how to do right now

Answer:

B. +5

Explanation:

Answer: 0on

Explanation:

Jose needs six hours to get there. The object's average speed is the total distance it travels in a predetermined amount of time. A scalar value is used to represent the normal speed. It is characterized by the magnitude and lacks direction.

Given

D(distance)=RT

D=40T

T FOR JOSE IS D/40.

D FOR ROB = 48*5.

From the White House to the recycling facility, it is D miles.

240=40T

T=240/40

Jose's travel time is T=6 Hours.

Calculating the ratio of the body's total distance travelled to the time needed to complete that distance yields the average speed formula. The average speed of an item travelling at a variable speed is calculated using equation.

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A) All of the following enforce municipal securities industry rules EXCEPT Office of the Comptroller of the Currency.

The Office of the Comptroller of the Currency (OCC) primarily regulates and supervises national banks and federal savings associations. While it plays a crucial role in overseeing the banking system, it is not directly responsible for enforcing municipal securities industry rules. On the other hand, the other options listed—MSRB (Municipal Securities Rulemaking Board), FINRA (Financial Industry Regulatory Authority), and SEC (Securities and Exchange Commission)—are all involved in regulating and enforcing rules related to municipal securities.  The MSRB is a self-regulatory organization that creates rules and regulations for broker-dealers and banks engaged in the municipal securities market. FINRA is another self-regulatory organization that oversees brokerage firms and their registered representatives, including those involved in municipal securities transactions. The SEC, as the primary regulatory body for the securities industry, has the authority to enforce rules and regulations related to municipal securities to protect investors and ensure fair and transparent markets.

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Answer:

1

Explanation:

Any digit that is not 0 is always significant

Answer:

jhykkjjhyefghhyuyy. iig jkhg k

Oxygen and silicon are the two most abundant elements in the Earth's crust, making up approximately 75% of the crust by weight.

The Earth's crust is composed of various elements, but two of the most abundant ones are oxygen and silicon. Oxygen is the most abundant element on Earth, and it makes up about 47% of the Earth's crust by weight. It is found in minerals like quartz, feldspar, and mica, and is an essential component of the Earth's atmosphere and biosphere.

Silicon is the second most abundant element in the Earth's crust and accounts for about 28% of its weight. It is found in minerals such as quartz, feldspar, and mica, and is also a key component in many human-made products, including computer chips and solar panels.

Together, oxygen and silicon make up approximately 75% of the Earth's crust by weight. Other significant elements include aluminum, iron, calcium, sodium, and potassium, while trace elements such as copper, zinc, and gold are present in small amounts. Understanding the composition of the Earth's crust is important for fields such as geology, mineralogy, and environmental science.

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The heat causes the sugar's atoms to combine with the oxygen in the air, forming new groups of atoms. Energy is released in this chemical reaction in the form of smoke and black soot.         hope this helps

Sugar is made of carbon, hydrogen, and oxygen atoms. When heated over a candle, these elements react with the fire to turn into a liquid. The heat causes the sugar's atoms to combine with the oxygen in the air, forming new groups of atoms. Energy is released in this chemical reaction in the form of smoke and black soot.