Which techniques would be best for separating a colloid mixture but would not work well with solutions? Check all that apply.
A) distillation
B) centrifugation
C) boiling/heating
D) chromatography
E) crystallization
F) long standing

Answer:

Example 1

palladium(II) nitrate,

Example 2

Metal catalysts such as Fe, Ni, Mo, and Co are routinely used in the manufacture of CNMs.

Explanation

The three metals used in catalytic converters — rhodium, platinum and palladium — are part of a category known as platinum group metals, or PGMs, which are known for their catalytic properties.

Answer:

14.9 mol

Explanation:

To find the number of moles in a given mass of a sample of sodium chloride (NaCl), we can multiply the number of grams in the sample by the molar mass of sodium chloride, which is 58.44 g/mol.

871 g × (1 mol / 58.44 g)

= 871/58.44 mol

≈ 14.9 mol

Note that we rounded to 3 significant figures in the final answer because that is how many significant figures were given in the mass measurement of the sodium chloride sample.

Answer: making sure the liquid inside the thermometer is at eye level when taking the temperature.

making sure the bulb of the thermometer does not touch the bottom of the beaker or the ice when taking the temperature

Explanation:

A thermometer is a device that's used to know the temperature of individuals. In order to ensure the accuracy of the readings in a thermometer, it is vital to making sure the liquid inside the thermometer is at eye level when taking the temperature.

Also, one should make sure the bulb of the thermometer does not touch the bottom of the beaker or the ice when taking the temperature.

The thermometer should not be used as a stirring rod. One should not shake it or play with it. Also, using either Celcius or Fahrenheit doesn't really matter.

Not every practice is accepted in temperature reading and these are the practices that apply are

Generally, The essential precautions that need to be taken when the using of thermometer encompass the following:

Do not use a thermometer as a stirring instrument,

Make positive that the liquid interior the thermometer is at eye stage when taking the temperature reading

Do not swing or shake down a thermometer reading

Therefore,the ways that apply are

Making sure the liquid inside the thermometer is at eye level when taking the temperature.

Making sure the bulb of the thermometer does not touch the bottom of the beaker or the ice when taking the temperature.

Option C and D are correct

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Answer:

can't read that language of the title man maybe next time man

Explanation:

what's the bolded stuff as the title that is supposed to be english so that you would now what formula you are solving for

Answer:

Explanation:

Since the pH has been given, the pOH can be found by using the formula

pH + pOH = 14

pOH = 14 - pH

From the question we have

pOH = 14 - 1.9

We have the final answer as

Hope this helps you

Answer:

12.10

Explanation:

Answer:

HOPE IT HELPS

The unit commonly used to measure pressure is the Pascal (Pa), which is equivalent to a force of 1 Newton per square meter: [Pressure] = 1 [kg/s²·m] = 1 Pa

Pressure is defined as the force per unit area. It can be represented using dimensional analysis by considering the fundamental units of force and area. Force is represented by the fundamental unit of mass (kg) multiplied by the fundamental unit of acceleration (m/s²). Therefore, the dimension of force is [kg·m/s²]. Area is represented by the fundamental unit of length (m) squared. Therefore, the dimension of area is [m²]. To determine the dimension of pressure, we divide the dimension of force by the dimension of area: [Pressure] = [Force] / [Area] = [kg·m/s²] / [m²]

Simplifying the expression, we can cancel out the common unit of length:

[Pressure] = [kg/s²·m] The unit commonly used to measure pressure is the Pascal (Pa), which is equivalent to a force of 1 Newton per square meter: [Pressure] = 1 [kg/s²·m] = 1 Pa Therefore, the dimension of pressure is [kg/s²·m] and its unit is the Pascal (Pa).

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The heat capacity for the metals are;

Aluminum -  0.89

Copper - 0.11

Iron - 0.44

Lead - 0.12

The specific heat of a substance is denoted by the symbol "C" and is typically measured in units of J/g·°C (joules per gram per degree Celsius) or cal/g·°C (calories per gram per degree Celsius).

The specific h

We have that;

For Aluminum;

c = 4.184 * 39.85 * 4.7/11.98 * 72.9

= 783.6/873.3

= 0.89

For Copper;

c =  4.184 * 12.14 * 1.9/12.14 * 75.4

= 96.5/915.3

= 0.11

For Iron

c =  4.184 * 40.24 * 2.4/12.31 * 75.1

= 404.1/924.5

= 0.44

For Lead

c = 4.184 * 39.65 * 0.7/12.46 * 76.7

c = 116.1/955.68

= 0.12

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Answer:

The current mass fraction of \(^{14}_{6} C\) should be approximately 68.8 percent.

Explanation:

\(^{14}_{6} C\) is a radioactive isotope with a halflife of 5568 years. The decay of any radioisotope is modelled after the following ordinary differential equation:

\(\frac{dm}{dt} = -\frac{m}{\tau}\)

Where:

\(m\) - Current mass of the isotope, measured in grams.

\(\tau\) - Time constant, measured in years.

The solution of this equation is of the form:

\(m(t) = m_{o}\cdot e^{-\frac{t}{\tau} }\)

Where:

\(t\) - Time, measured in years.

\(m_{o}\) - Initial mass of the isotope, measured in grams.

The time constant can be found as a function of halflife (\(t_{1/2}\)):

\(\tau = \frac{t_{1/2}}{\ln 2}\)

If \(t_{1/2} = 5568\,yrs\) and \(t = 3000\,yrs\), the mass fraction of \(^{14}_{6} C\) is:

\(\tau = \frac{5568\,yrs}{\ln 2}\)

\(\tau \approx 8032.926\,yrs\)

\(\frac{m(3000\,yrs)}{m_{o}} = e^{-\frac{3000\,yrs}{8032.926\,yrs} }\)

\(\frac{m(3000\,yrs)}{m_{o}} \approx 0.688\)

The current mass fraction of \(^{14}_{6} C\) should be approximately 68.8 percent.

Answer:

Wave

Explanation:

Wave refers to any disturbance that carries energy from one place to another.

Wave refers to disturbance or variation that occur in a body travelling or in motion which travels from one medium to another by transmitting energy from one location which is the origin to another location without transporting matter.

Therefore, Wave refers to any disturbance that carries energy from one place to another

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Answer:

c.CH4 < NH3 because the NH bond is more polar than the CH bond.

Explanation:

Some of the essential features of computers:

1. Processing Power

2. Storage Capacity

3. Memory

4. Input and Output

5. Connectivity

6. Software

7. Multitasking

8. Scalability

9. Reliability and Durability

10. User Interface

Computers are complex machines that have become an integral part of our daily lives. They possess several key features that enable them to perform a wide range of tasks efficiently. Here are some of the essential features of computers:

1. Processing Power: Computers are capable of executing complex calculations and tasks at incredible speed. They contain powerful processors that can perform billions of operations per second, enabling them to handle various applications and processes.

2. Storage Capacity: Computers have the ability to store and retrieve vast amounts of data. They come equipped with different types of storage devices such as hard drives, solid-state drives (SSDs), and cloud storage, providing ample space for storing files, programs, and operating systems.

3. Memory: Computers have two primary types of memory: RAM (Random Access Memory) and ROM (Read-Only Memory). RAM provides temporary storage for data and instructions that the computer is actively using, while ROM contains firmware and permanent instructions that are essential for booting up the computer.

4. Input and Output: Computers allow users to interact with them through various input and output devices. Input devices include keyboards, mice, touchscreens, and microphones, while output devices include monitors, printers, speakers, and headphones. These devices enable users to input commands and receive feedback from the computer.

5. Connectivity: Computers can connect to networks and other devices, enabling communication and data transfer. They have built-in network adapters and support for various connectivity options such as Ethernet, Wi-Fi, Bluetooth, and USB, allowing users to access the internet, share files, and connect to peripherals.

6. Software: Computers run on software, including operating systems, applications, and utilities. The software provides the instructions and programs that allow users to perform tasks, manipulate data, and manage hardware resources.

7. Multitasking: Computers are designed to handle multiple tasks simultaneously. They can execute multiple programs concurrently, switch between tasks rapidly, and allocate system resources efficiently, providing users with the ability to multitask and enhance productivity.

8. Scalability: Computers offer scalability, allowing users to upgrade hardware components and expand storage capacity as needed. This feature ensures that computers can adapt to evolving technological demands and accommodate future growth.

9. Reliability and Durability: Computers are designed to be reliable and durable. They undergo rigorous testing and are built with high-quality components to ensure stable performance and withstand daily use.

10. User Interface: Computers provide graphical user interfaces (GUIs) that enable users to interact with the system easily. GUIs utilize visual elements such as icons, windows, and menus, making it intuitive for users to navigate and access various functions.

These features collectively make computers versatile, powerful, and indispensable tools in our modern world, enabling us to accomplish a wide range of tasks efficiently and effectively.

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Answer:

N2O(g) + 3 H2O(l) ---------------> 2 NH3(g) + 2 O2(g)

Explanation:

If we look at the reaction stated in the question, we will notice that the option chosen in the answer is the reverse of that reaction.

One thing is clear, if a reaction is possible, then its reverse reaction is equally possible. The equilibrium position may shift towards the forward or reverse reaction based on the conditions of the reaction.

Hence if the reaction, 2NH3(g) + 2O2(g) → N2O(g) + 3H2O(l) is possible, then the reaction, N2O(g) + 3 H2O(l) ---------------> 2 NH3(g) + 2 O2(g) is also possible.

24.6 mol Cu

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

[Given] 1.48 × 10²⁵ atoms Cu

[Solve] moles Cu

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

24.5766 mol Cu ≈ 24.6 mol Cu

The volume of a metal with mass of 24.6 g and a density of 4.0 g/mL is 6.15mL.

The density of a substance is a measure of the mass of matter contained by a unit volume. It is measured in grams/litres.

The density can be calculated by dividing the mass by its volume as follows:

Density = mass ÷ volume

According to this question, a metal has a mass of 24.6 g and a density of 4.0 g/mL. The volume can be calculated as follows:

Volume = 24.6g ÷ 4g/mL

Volume = 6.15mL

Therefore, the volume of a metal with mass of 24.6 g and a density of 4.0 g/mL is 6.15mL.

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Answer:

To prepare 250 ml of 0.15 M KNO3 solution, you will need to follow these steps:

Calculate the amount of KNO3 needed:

Molarity (M) = moles of solute/liters of solution

Rearranging the formula, moles of solute = M x liters of solution

Moles of KNO3 needed = 0.15 M x 0.25 L = 0.0375 moles

Calculate the mass of KNO3 needed:

Mass = moles x molar mass

The molar mass of KNO3 is 101.1 g/mol

Mass of KNO3 needed = 0.0375 moles x 101.1 g/mol = 3.79 g

Dissolve the calculated amount of KNO3 in distilled water:

Weigh out 3.79 g of KNO3 using a digital balance

Add the KNO3 to a clean and dry 250 ml volumetric flask

Add distilled water to the flask until the volume reaches the 250 ml mark

Cap the flask and shake it well to ensure the KNO3 is completely dissolved

Verify the concentration of the solution:

Use a calibrated pH meter or a spectrophotometer to measure the concentration of the solution

Adjust the volume of distilled water or the mass of KNO3 as needed to achieve the desired concentration

It is important to note that KNO3 is a salt that can be hazardous if ingested or inhaled in large quantities. Therefore, it is recommended to handle it with care and wear appropriate personal protective equipment.

Explanation:

A battery is a device that converts chemical energy into electrical energy, and it does that by using electrodes and solutions. Usually, we will have two electrodes connected by an external circuit, usually, a wire, and the flow of electrons from one solution to another will be converted to electrical energy, which is basically the definition of electricity, the flow of electrons.

In this picture we can see the solutions of Zinc (s) and Copper (s), the Zinc will lose electrons and these electrons will flow through an external circuit, a wire, and reach the Copper, which will receive the electrons.

Answer:

one mole of water contains 6.02 x 1023 MOLECULES of water.

But each molecule of water contains 2 H and 1 O atom = 3 atoms, so there are approximately 1.8 x 1024 atoms in a mole of water.

Explanation:

hope it helps you paigegeorge

Answer:

i think its P6O15

Explanation:

Answer:

ok, here is your answer

Explanation:

AI-generated answer

To find the mass of oxygen that reacted, we need to use the Law of Conservation of Mass, which states that in a chemical reaction, the mass of the reactants equals the mass of the products.

First, we need to find the number of moles of hydrogen that reacted:

Molar mass of hydrogen (H₂) = 2.016 g/mol

Number of moles of H₂ = mass/molar mass = 46.2 g/2.016 g/mol = 22.92 mol

Next, we need to use the balanced chemical equation to find the number of moles of water produced:

hydrogen + oxygen → water

2H₂ + O₂ → 2H₂O

From the equation, we can see that for every 2 moles of H₂, 1 mole of O₂ is required to produce 2 moles of H₂O. Therefore, the number of moles of O₂ required to produce 22.92 moles of H₂O is:

Number of moles of O₂ = 1/2 x 22.92 mol = 11.46 mol

Finally, we can find the mass of oxygen that reacted by using its molar mass:

Molar mass of oxygen (O₂) = 32.00 g/mol

Mass of oxygen = number of moles x molar mass = 11.46 mol x 32.00 g/mol = 366.72 g

Therefore, the mass of oxygen that reacted is 366.72 g.

Answer:

chemical change because a different solid substance is formed.

Answer:

B) Chemical Change

Explanation:

Combining the two clear colorless liquids is a chemical change because a different solid substance is formed. A precipitate is an insoluble solid that forms when two solutions are combined and react chemically. Insoluble means that the solid will not dissolve.

Answer:

C is the correct answer

Explanation:

The moon cycle is last 29.5 days

Answer:

answer is d

Explanation:

it takes the moon 29.5 days to make one revolution around earth

The salt solution has served as a buffer system, preventing pH changes caused by the addition of acid or base to the solution.

Since the hydrogen ion is a component of the acid, it reacts with the base to produce salt, which prevents the pH from changing too much.

The buffer solution's acid addition has been specified as:

\(HCl +NH_{3} > > > NH_{4} Cl\)

To prevent the pH from changing, the base addition to the buffer combines with the acid component to create salts.

Following are the instructions for adding the base, NaOH, to the buffer solution:

\(NaOH + NH_{4} ^{+} > > > > > Na^{+}+ NH_{3}+ H_{2}O\)

A buffer solution is an aqueous mixture of a weak acid and either its conjugate base or the base itself. When a modest amount of a strong acid or base is applied to it, the pH hardly changes at all.

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(a) For zero-order reactions, the unit of the rate constant (k) is mol/L*s. or

mol L⁻¹ s⁻¹

(b) For first-order reactions, the unit of the rate constant (k) is 1/s.

(c) For second-order reactions, the unit of the rate constant (k) is L/mol*s. or  mol⁻¹ L s⁻¹.

For Zero Order Reaction

The concentration of the reactants does not change over time, and the concentration rates are constant in zero order processes.

A → Product

The units of k for a zero order reaction are what?

The letter k stands for the reaction's rate constant.

The rate constant of a zero-order reaction is written as concentration/time, or M/s, where M is the molarity and s is one second.

The rate constant is measured in units of k = mol L-1 s-1.

For First-order reactions

The concentration of one of the reactants has a direct correlation with the reaction rate in a first-order reaction. A products are a common general form of first-order reactions. A → Product

The first-order reaction's differential rate is as follows:

rate=−Δ[A]/Δt   = k[A]

When the concentration of A doubles, the response rate also doubles; similarly, when the concentration of A is multiplied by ten, the reaction rate multiplies by ten; and so on. First-order rate constants are measured in reciprocal seconds (s1) since the reaction rate is always measured in moles per litre per second.

For Second-order reactions

A second-order reaction is classified as being simple if its rate is proportional to the square of the concentration of a single component. These often have products in form 2A. The rate of a second type of second-order reaction is inversely correlated with the product of the concentrations of the two reactants. These reactions typically result in compounds of the form A + B. A dimerization reaction is an illustration of the former, in which two smaller molecules, each referred to as a monomer, combine to create a larger molecule (a dimer).

The following is the differential rate law for the simplest second-order reaction with 2A products:

rate=−Δ[A] / 2 Δt=k[A]²

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Answer:

Explanation:

a

Answer:

The answer is D - Keq = [H2]^2 × [O2]

[2]^2

Explanation:

The equilibrium constant (Keq), is a quantitative measure of the position of equilibrium in a chemical reaction. It is defined by the ratio of the concentrations (or partial pressures) of the products to the concentrations (or partial pressures) of the reactants.

For a general chemical reaction:

aA+bB + CC+dD

Explanation: The equilibrium constant expression is given by:

Keq = [C]^c x [D]^d

[A]^a x [B]^b

Where [A], [B], [C], and [D] represent the molar concentrations of the species A, B, C, and D, respectively. The coefficients a, b, c, and d represent the stoichiometric coefficients of the balanced equation.

The given reaction is 2H2O(g) ↔ 2H2(g) + O2(g)

The equilibrium constant expression for the given system can be expressed as follows:

Keq = [H2]^2 × [O2]

[2]^2

Where:

[H2] represents the molar concentration of hydrogen gas (H2).

[O2] represents the molar concentration of oxygen gas (O2).

[H2O] represents the molar concentration of water vapor (H2O).

The equilibrium constant expression for the given system can be expressed as follows: Keq = [H2]^2 × [O2]

[2]^2

Answer:

solid

Explanation:

If you were to leave the gallium in the interior of the car at those temperatures the gallium would still be in a solid physical state when you return. This is because the temperature in Fahrenheit when you return is 85.08F which converted to Celsius would equal 29.488C. This is close to Gallium's melting of 29.768C point but does not exceed it, meaning that it is close to melting but has not yet done so and is, therefore, still a solid.

Answer:

oxygen-16 is a stable isotope of oxygen, having 8 neutrons and 8 protons in its nucleus. It has a mass of 15. u

Answer:

The Northern Hemisphere is tilted away from the sun.

Explanation:

Kevin travels from the United States to Australia for the winter, but when he gets there it feels more like summer. Which statement explains this? The Northern Hemisphere is tilted away from the sun. When it is winter, the United States receives the least direct solar energy, as compared with the rest of the year.

The answer is B) The Southern Hemisphere is experiencing an equinox.

The two days of the year on which neither hemisphere is tilted toward or away from the sun.

This means that if he goes to the Northern Hemisphere it will be warm. And if he goes to the Southern, he will be warm too.

The Southern Hemisphere is experiencing an equinox.

Kevin travels from the United States to Australia for the winter, but when he gets there it feels more like summer. Which statement explains this? The Northern Hemisphere is experiencing an equinox. The Southern Hemisphere is experiencing an equinox. The Southern Hemisphere is tilted toward the sun, so it is summer in Australia.

Therefore, your answer is B) The Southern Hemisphere is experiencing an equinox.

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