the percent copper in an unknown copper compound is 26.30 %. what is the formula weight of the unknown compound? you may assume that one mole of the compound contains one mole of copper. enter your answer in units of amu.

Answer:

Crushing large stones into smaller stones would be a physical change because you are merily crushing its physical size, while the chemical composition for the stone stayes the same.

So, in the 0.310 mol sample, there would be approximately 1.859 x 10^23 ammonium ions and 1.859 x 10^23 sulfate ions.

In a 0.310 mol sample of NH42SO4, there are equal numbers of ammonium ions (NH4+) and sulfate ions (SO42-).

This is because the formula NH42SO4 indicates that there are two ammonium ions and one sulfate ion in the compound.

Therefore, in a 0.310 mol sample, there would be 0.310 moles of both ammonium ions and sulfate ions.

To convert this to the number of ions, you can use Avogadro's number, which is approximately 6.022 x 10^23 particles per mole.

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The pH of a solution is 1.60.

Chemical dissotiation of hydrochloric acid:

HCl(aq) → H⁺(aq) + Cl⁻(aq)

c₁(HCl) = 0.10 M; original concentration of the solution of hydrochloric acid (HCl) before it gets diluted

V₁(HCL) = 25.0 ml; the volume of HCl to be diluted

V₂(HCl) = 100.0 ml; final volume of HCl after dilution.

c₂(HCl) = ?; final concentration of the solution of HCl, after dilution

c₁ · V₁ = c₂ · V₂; formula to calculate concentration of a solution

c₂(HCl) = c₁ · V₁ ÷ V₂.

c₂(HCl) = 0.10 M · 25.0 ml ÷ 100 ml

c₂(HCl) = 0.025 M

From chemical reactio: c₂(HCl) = c(H⁺)

c(H⁺) = 0.025 M; concentration of hydrogen ions

pH = -logc(H⁺)

pH = 1.60

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Answer:

A) 1 meters

Explanation:

i hope that's right

The main answer is that the element likely belongs to Group 2 of the periodic table, also known as the alkaline earth metals.

The element's ionization energy values suggest that it is likely an alkaline earth metal and belongs to Group 2 of the periodic table.
The explanation for this is that elements in Group 2 have relatively low first ionization energies, which is reflected in the value of 0.7 mj/mol21 given in the problem.

As you move down Group 2, the second, third, and fourth ionization energies generally increase, which matches the trend seen in the given values of 1.5, 7.7, and 10.5 mj/mol21.

In summary, the element's ionization energy values suggest that it is likely an alkaline earth metal and belongs to Group 2 of the periodic table.

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Answer:

i know right answer

Explanation:

let me explain

Answer:

The correct answer -

a. Cd and Pb(NO3)2

b. Redox reactions

c. Pb and Cd(NO3)2

Explanation:

This is the reaction known as the redox or reduction-oxidation reaction of metals. In this particular reaction, there are two reactants Cadmium (III) in solid-state and lead (II) nitrate in the aqueous state. At the end of this reaction, the products that we get are lead (II) in solid-state and Cadmium (III) nitrate in the aqueous state.

cadmium (s)+ lead nitrate (aq) = lead (s) + cadmium nitrate (aq)

Cd (s) + Pb2+(aq) → Pb(s) + Cd2+(aq)

Here, Oxidizing agent is Pb2+ and the reducing agent is Cd.

Answer: D

Explanation:

A control group is the variable that remains constant throughout the whole experiment

The statement which is true about a control group is that it is a test group where the variable is not changed or applied. Thus, the correct option for this question is D.

A control group may be defined as a group that is significantly separated from the rest of the experiment, where the independent variable is being tested. This group reflects the difference between dependent and independent variables.

According to the context of this question, during the course of the experiment, the control groups remains constant throughout the process. Researchers compare the results of a treatment group to the control group in order to determine the effect size, also known as the treatment effect.

Therefore, the correct option for this question is D.

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Answer: It will be C. neutron.

Explanation:

1.432 x 10^6 g of Fluoride contains 2.90 x 10^25 atoms.

Every element is made up of atoms, and its chemical and physical properties are determined by the number and arrangement of these atoms. The mass of an atom is usually measured in atomic mass units (amu). One atomic mass unit is equal to 1.66 x 10^-24 grams.

In order to determine the number of atoms in a given mass, we must first convert the mass to atomic mass units. We can then use Avogadro's number, which is 6.022 x 10^23 particles per mole, to calculate the number of atoms.

In this case, 1.432 x 10^6 grams of Fluoride would convert to 8.668 x 10^23 atomic mass units. Using Avogadro's number, we can calculate that this mass of Fluoride contains 2.90 x 10^25 atoms.

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Given data:H2O vapor content: 13 gramsH2O vapor capacity: 52 grams at 25 degrees Celsius 13 grams at 10∘C52 grams at 30∘CFormula used to find the dew point:$$\dfrac{13}{52}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$\frac{1}{4}=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$

Where A is the constantDew Point:It is the temperature at which air becomes saturated with water vapor when the temperature drops to a point where dew, frost or ice forms. To solve this question, substitute the given data into the formula.$$13/52=\dfrac{(A*3\pi)/(ln100)}{(17.27-A)}$$$$13(17.27-A)=3\pi A(ln100)$$By simplifying the above expression, we get$$A^2-17.27A+64.78=0$$Using the quadratic formula, we get$$A=9.9,7.4$$

The dew point is 7.4 since it is less than 10°C.More than 100:The term "More than 100" has not been used in the question provided.

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A pseudoscience, different of actual science, does not use the scientific method:

The problem with pseudoscience comes at the point 4, as you can't perform experiments to test your hypothesis.

1) Another discipline that could be considered a pseudoscience is, for example, numerology or tarot.

Where both try to explain in some way something, but in neither we can actually perform an experiment to test how true these are.

2) The peer-review is important, as humans are social animals. The opinion of our peers are really important for us, and this also applies for science. As you can see in the last point, you eventually need to present what you found to the scientific community, so eventually, your peers will see and review what you found.

3) A question that can be answered by science is anything that can be studied with an experiment, like:

How much time do you need to boil a cup of water to vaporize it completely?

While a question that can be answered by philosophy would be something that can be studied with a survey, like:

What is the meaning of friendship?

4) Astronomers actually use giant labs, that is called observatories, these are usually located in places with a low population (particularly because these need to have low luminous contamination, so the best ubications are far away from cities). Being in places away from large human populations is really important to recycle in order to not contaminate nor affect the near biodiversity. Safety is more trivial, it is always important, think that astronomers work with really heavy things and are often really far away from the nearest hospital, so having an accident while at work can be really problematic, so they need to take all the safety precautions they can.

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Answer:

1.  Another example of pseudoscience could be numerology. You are unable to test or create an experiment based on your hypothesis and still receive factual results.

2. Some investigations have similar or the same outcomes, this is a result of the reproducibility an experiment can prove. When scientists perform an experiment it is important that the experiment is able to be replicated. This is one of the main factors that are important to the scientific method because it proves that your first answer wasn’t a fluke.

3.  The peer-review process is quite important to the community because we often heavily rely on the opinions of others to sway our decisions and final outcomes. For science this is incredibly important, you can have your fellow scientists read over your evaluation for an experiment and make sure that it was performed correctly. Using your summary of the experiment they can also perform it again so that they are sure it was testable.

4.  For something to be answered by science it has to be testable, an example of that would be; “How many days does it take a blue, red, and white rose to die out of the earth?” A philosophical question would be answered in more of a survey; “What is the meaning of life?”

5. Astronomers have their labs far out away from cities so that the light they use is as clean as possible with little human interference. They also recycle frequently to keep the biodiversity in the area they work in continuously moving, with as little effect on the environment as possible. The risk that comes with this is they often use large heavy machinery and work with various substances so if there were to be an accident the nearest hospital would be a great distance.

Explanation:

Hope this helps have a great day!

Answer:

When the teeth chews the food. Food moves down the esophagus by the process of peristalsis .The stomach churns the food which breaks it into smaller pieces and mixes it with the gastric juices to produce a liquid called chyme. In the small intestine a process called segmentation the chyme sloshes back and forth between the segments of the small intestine.

Explanation:

The amount in grams of Na₂SO₄ that can be produced from 10.0 grams of NaOH is 4.46 grams.

To calculate the number of grams of Na₂SO₄ produced from 10.0 grams of NaOH, we need to use stoichiometry. Here is the balanced chemical equation:

4NaOH + 2H₂SO₄ → 2Na₂SO₄ + 4H₂O

Firstly, let's calculate the number of moles of NaOH present in 10.0 grams. We need the molar mass of NaOH to do that. The molar mass of NaOH is 23.0 + 16.0 + 1.0 = 40.0 g/mol.

Moles of NaOH = Mass of NaOH/Molar mass of NaOH = 10.0/40.0 = 0.25 mol

Now, we can use stoichiometry to determine the number of moles of Na₂SO₄ produced. From the balanced equation, 4 moles of NaOH react with 2 moles of H₂SO₄ to produce 2 moles of Na₂SO₄. This means that 1 mole of NaOH reacts with 1/2 mole of H₂SO₄ to produce 1/2 mole of Na₂SO₄.

Moles of Na₂SO₄ = Moles of NaOH × (1/2)× (2/4)= 0.25× 1/2× 1/2 = 0.03125 mol

Finally, we can convert the number of moles of Na₂SO₄ to grams using the molar mass of Na₂SO₄. The molar mass of Na₂SO₄ is 23.0 × 2 + 32.1 + 16.0 × 4 = 142.1 g/mol.

Number of grams of Na₂SO₄ = Moles of Na₂SO₄ × Molar mass of Na₂SO₄ = 0.03125 × 142.1 = 4.46 g

Therefore, 4.46 grams of Na₂SO₄ are produced from 10.0 grams of NaOH.

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By analyzing the charges of all ionizable groups in this peptide (shown in the attached table), we can conclude that the net charge of the molecule at pH 3 will be +3, at pH 8 it will be +1, and at pH 11 it will be 0.

To answer this question, we must look at the pKa values of all the groups that can be ionized in this peptide.

Glu is glutamic acid, and because it is located on the N-terminus of this peptide, we need to consider its amino group (pKa = 9.67) and its side-chain carboxylic group (pKa = 4.25). For histidine (His) the only relevant group is the one in its side-chain (pKa = 6.00). Tryptophan (Trp), serine (Ser), one of the glycines (Gly), leucine (Leu), and proline (Pro) do not have side chains that can be ionized and their amino and carboxylic groups are engaged in the peptide bonds, so we do not have to consider them for this. However, we have to consider arginine's (Arg) side chain (pKa = 12.48) and C-terminus glycine's carboxylic group (pKa = 2.34).

Based on this, we can construct a table (attached below) that shows what charge (if any) the listed groups will bear at the given pH values, and sum them up to calculate the net charge.

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Answer:D

Explanation:

The Terrestrial Planets. From top: Mercury, Venus, Earth and Mars. The planets Mercury, Venus, Earth, and Mars, are called terrestrial because they have a compact, rocky surface like Earth's terra firma. The terrestrial planets are the four innermost planets in the solar system.

The Earth then emits this energy as heat in the form of longwave infrared radiation.

What is heat?

According to thermodynamics, heat is a type of energy that crosses a thermodynamic system's border due to a temperature differential across the barrier. In a thermodynamic system, heat is not present. But the phrase is also frequently used to refer to the thermal energy that makes up a system's internal energy and is reflected in the system's temperature. Heat is a type of energy in both senses of the word. Heat is energy that is transferred into or out of a thermodynamic system via a mechanism involving either the corresponding macroscopic characteristics or microscopic atomic modes of motion. The transmission of energy through thermodynamic work or mass transfer is not included in this descriptive description.

Today, the Earth's surface and atmosphere absorb around 71% of the sunlight that enters the planet. The temperature of an object or surface that has absorbed sunlight is raised by the quicker vibration of the molecules. The Earth then emits this energy as heat in the form of longwave infrared radiation. A surface warms up and releases more energy as heat the more sunshine it receives. The greenhouse effect warms the atmosphere as a result of greenhouse gases and clouds absorbing and reradiating this heat.

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Answer:

Respiration happens in the cells of plants, animals and humans, mainly inside mitochondria, which are located in a cell's cytoplasm. The energy released during respiration is used by plants to make amino acids, and by animals and humans to contract their muscles to let them move.

Explanation:

Answer:

Particles exchange energy through elastic collisions.  

All particles are in constant random motion.

Except during collisions, interactions between particles are negligible.

Temperature depends only on the average kinetic energy of the particles.

Explanation:

Answer:

A,B,D,E egd

Explanation:

The information we can obtain for an element from periodic table is its atomic number and chemical symbol. Thus option A and B are correct.

Atomic number of an element is the number of protons of the element. For a neutral atom the number of electrons is equal to the number of protons.

There are 118 elements in the modern periodic table and they are classified into different group and periods. Elements of same number of valence electrons and similar physical and chemical properties are classified into one group.

There are 18 groups and 7 period in  the periodic table. Each classification is based on their atomic number. Chemical symbols are used to represent the elements and they can be easily identified by the symbols.

For example, hydrogen have the chemical symbol H and oxygen with O and carbon with C. etc. Similarly we can get mass number of elements from periodic table. Thus option A and B are correct.

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Answer: Copper is purified by electrolysis . Electricity is passed through solutions containing copper compounds, such as copper(II) sulfate. The anode (positive electrode ) is made from impure copper and the cathode (negative electrode) is made from pure copper. Pure copper forms on the cathode.

Answer:

1- Natural sources are renewable with time

2- To refrain from over usage of products on unnecessary things

3- An example of poor soil management is using the soil with the most minerals to put houses on instead of farming with

Answer:

London dispersion forces

Explanation:

The London dispersion force is a temporary attractive force that results when the electrons in two adjacent atoms occupy positions that make the atoms form temporary dipoles.

Answer:

anode: magnesium

cathode: nickel

Explanation:

edg. 2021

Answer:

protons and neutrons

Explanation:

Answer:

All answers stated below:

Explanation:

1. Plate Tectonics

2. lithosphere

3. asthenosphere

4. divergent boundary

5. (not sure)

6. convergent

7. transform

8. convection

The diagrams show the arrangements of carbon atoms in diamond and in graphite. The diamond is sp³ hybridized and have tetrahedral shape while graphite is sp² hybridized and is hexagonal ring shaped structure.

Diamond containing carbon atoms are strongly bonded chemically with other four carbons. The carbon atoms are sp³ hybridized and make percept tetrahedral shape. Diamond used in jewelry makin g. they are used by surgeons in the cataract surgery. diamond is hard, used for cutting or drilling rock.

Graphite containing carbon atom are form the weak bond with weak forces. the carbon are sp² hybridized and make a hexagonal ring shape structure. The force in graphite in weak that makes it useful material.  it is used as lubricant. it is used in pencil. used in making electrodes.

The diagrams show the arrangements of carbon atoms in diamond and in graphite. The diamond is sp³ hybridized and have tetrahedral shape while graphite is sp² hybridized and is hexagonal ring shaped structure.

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