Which of the following would be considered a derived unit? A) length B mass C) density D) temperature​

Answer: a. 1.11 atm, 0.43 mol

Explanation:

Relative and average atomic mass both describe properties of an element related to its different isotopes. Out of these two Relative atomic mas is more accurate. The average atomic mass is 303g.

Mass defines the quantity of a substance. It is measured in gram or kilogram. Average mass is the mass of atoms of an element that are isotopes. It can be calculated by multiplying mass of a isotope to natural abundance of that isotope.

Average atomic mass = (mass of first isotope× percent abundance of first isotope)+(mass of second isotope× percent abundance of second isotope)

Substituting the given values

Average atomic mass=( 302 ×  12.64 %)+(304 × 18.23 %) + (306 × 69.13% )

Average atomic mass=303g

Therefore, the average atomic mass is 303g.

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The correct answer is E) none of these, as the calculated volume of hydrogen gas is larger than any of the options given.

he balanced chemical equation for the reaction of calcium hydride (CaH2) and water (H2O) is:

CaH2 + 2H2O → Ca(OH)2 + 2H2

First, we need to determine which reactant is limiting and which is in excess. To do this, we will convert the given masses to moles:

84.0 g CaH2 × (1 mol CaH2/42.10 g CaH2) = 1.999 mol CaH2

42.0 g H2O × (1 mol H2O/18.02 g H2O) = 2.332 mol H2O

Since the stoichiometric ratio of CaH2 to H2O is 1:2, we can see that H2O is the limiting reactant, and CaH2 is in excess. Therefore, we will use the amount of H2O to calculate the theoretical yield of hydrogen gas:

2.332 mol H2O × (2 mol H2/2 mol H2O) × (22.4 L/mol) = 52.27 L H2

This assumes that the reaction goes to completion and that all of the H2 produced is collected at the given temperature and pressure.

Therefore, the correct answer is E) none of these, as the calculated volume of hydrogen gas is larger than any of the options given.

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Answer:

yes it chemical to electrical to radiant energy

Explanation:

correct

The mineral presented in the image has a metallic luster. It is opaque, which means that it is not clear and light does not pass through it. It also has cleavage, which refers to the tendency of a mineral to break along planes of weakness.

The cleavage is evident in the image, as the mineral appears to have flat, smooth surfaces that intersect at sharp angles when it is broken or fractured.Cleavage is one of the most important properties of a mineral because it provides information about the way in which the mineral will break when subjected to external forces.

A mineral with good cleavage will break into pieces that have a smooth, flat surface, while a mineral with poor cleavage will break into pieces that have an uneven surface. This property is often used by mineralogists to help identify minerals since it is unique to each mineral.

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The mineral’s luster, opacity, and cleavage define its properties. Metallic luster means it reflects light like metal, opacity implies no light passes through it, and cleavage speaks to how it breaks.

In order to determine the characteristics of a mineral, we assess attributes such as the mineral's luster, opacity, and cleavage. The metallic luster refers to how light interacts with the surface of a mineral, metallic luster means the mineral reflects light as a polished metal would.

When a mineral is opaque, it means that light does not pass through it at all - it is not transparent or translucent. Lastly, a mineral's cleavage refers to how it breaks or fractures along distinctive planes. To accurately describe the mineral in the image, these three characteristics would need to be observable.

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Answer:

2

Explanation:

2 atoms of hydrogen each of mass 1 = 2 x 1 = 2 g mol–1

1 atom of sulphur of mass 32 = 1 x 32 = 32 g mol–1

4 atoms of oxygen of mass 16 = 4 x 16 = 64 g mol–1

Plants use carbon to build leaves and stems, which are then digested and used for cellular growth by animals. Carbon is stored in the atmosphere as gases such as carbon dioxide. It is also stored in the oceans, where it is captured by a variety of marine organisms.

A heterotroph is an organism that, unlike an autotroph, cannot fix carbon and instead grows on organic carbon.

Carbon dioxide is pulled from the air by photosynthesis to produce carbon-based food for plant growth. Carbon is transferred from plants to animals.

Carbon from plants moves through food chains to the animals that eat them. Animals that eat other animals absorb carbon from their food as well.

Thus, Organic molecules produced by photosynthesizes are consumed by food chains, and cellular respiration converts the organic carbon back into carbon dioxide gas.

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Answer:

14.5 moles of CH4

Explanation:

There is 14.5 moles of carbon in the product CO2....there has to be 14.5 moles of carbon in the reactant CH4

   14.5 moles

**The Micropipet** does not have a suggested use in typical titrimetric experiments conducted so far.

In titrimetric experiments, various laboratory tools and equipment are used to measure and transfer precise volumes of solutions. The Erlenmeyer flask is a common vessel used to hold solutions during titrations. The Mohr pipet is employed for accurate delivery of measured volumes of solutions. The Scoopula, on the other hand, is a spatula-like tool used for transferring solid reagents.

However, the **Micropipet** is not commonly used in typical titrimetric experiments. Micropipets are more frequently utilized in analytical techniques such as spectrophotometry or molecular biology experiments, where small volumes in the microliter range need to be dispensed accurately. In titrimetry, the volumes involved are typically larger, making other tools like Mohr pipets or burettes more suitable for the task.

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To determine the equilibrium ratio of [A-]/[HA] in a buffer, we need to consider the acid dissociation equilibrium constant, Ka, of the acid (HA).

The equilibrium expression for the dissociation of an acid is:

HA ⇌ H+ + A-

The equilibrium constant, Ka, is defined as [H+][A-]/[HA]. Rearranging the equation,we get [A-]/[HA] = [H+]/Ka

In a buffer solution, the concentration of [H+] is determined by the pH of the solution. The pH is related to [H+] by the equation pH = -log[H+]. Let's assume the pH of the buffer solution is pH_buffer.

So, [H+] = 10^(-pH_ buffer) Substituting this into the equilibrium ratio equation, we have:

[A-]/[HA] = 10^(-pH_ buffer)/Ka

Therefore, the equilibrium ratio of [A-]/[HA] in the buffer is 10^(-pH_ buffer)/Ka. This ratio depends on the pH of the buffer solution and the acid dissociation constant (Ka) of the acid used in the buffer.

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Answer:

Cl2 (aq) + 2H2 O HOCl(aq) + Cl-(aq) + H2O Equation 1 The hypochlorous acid dissociates almost immediately into hydrogen and hypochlorite ions (OCl-).

Explanation:

The balanced chemical equation for the reaction between iron oxide and carbon dioxide can be given by: Fe2O3 + 3CO2 → 2FeCO3. The above equation indicates that for every 3 moles of carbon dioxide, 1 mole of Fe2O3 is consumed in the reaction.

Hence, to produce 12 moles of carbon dioxide, we can set up a proportion that relates to the number of moles of Fe2O3 required for the reaction.

The proportion can be given as:3 moles CO2 / 1 mole Fe2O3 = 12 moles CO2 / x moles Fe2O3.

Cross-multiplying the above equation, we get:3 moles CO2 × x moles Fe2O3 = 12 moles CO2 × 1 mole Fe2O3.

Simplifying further, we get:x moles Fe2O3 = (12/3) moles CO2 = 4 moles CO2.

Hence, 4 moles of iron oxide would be required to produce 12 moles of carbon dioxide.

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The product of an acid-base reaction that is most likely to be an ionic compound is a salt. Option D).

In an acid-base reaction, the product that is most likely to be an ionic compound is a salt. A salt is formed when an acid reacts with a base, resulting in the transfer of ions between the two reactants. Acids typically release hydrogen ions (H+) when dissolved in water, while bases release hydroxide ions (OH-). When these ions combine, they form water (H2O), which is a neutral molecule.

However, in addition to water, the reaction between an acid and a base also produces a salt. A salt is an ionic compound composed of positive and negative ions. The positive ion usually comes from the base, while the negative ion comes from the acid. The combination of these ions results in the formation of an ionic compound, which is commonly referred to as a salt.

Therefore, the product of an acid-base reaction that is most likely to be an ionic compound is a salt. Hence option D) is correct.

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Answer:

Below

Explanation:

Your answer should have the same number of S.D. as the element with the least number of S.D. ....in this case  3.88  has  THREE S.D. so your answer should be rounded to three S.D.

15.222 - 3.88 = 11.342   = ~ 11.3  to three sig dig

Answer

F) The pressure of a gas exerted on the walls of its container is inversely proportional to the volume of the gas when the temperature of the gas remains constant.

Explanation

Boyle's law states that the volume of a given mass of gas varies inversely with the pressure when the temperature is kept constant. An inverse relationship is described in this way. As one variable increases in value, the other variable decreases. He discovered that doubling the pressure of an enclosed sample of gas, while keeping its temperature constant, caused the volume of the gas to be reduced by half.

Answer:

It would be this below.

Explanation:

I am not 100% sure this is write but I did my best this is still kinda hard for me. I just did this a few years ago and i struggled with it but I have been doing better since then.

Hope this helps :))

Answer:

B has highest stability

Explanation:

as its octet is complete

plz mark brainliest if it helps

Answer:

Ecstasy,LSD, Rohypnol

All atoms in a piece of pure copper have the same atomic number and the same number of electrons which is option A.

Copper is an element that consists of only one type of atom, which is the copper atom. The copper atom has 29 protons in its nucleus, which gives it an atomic number of 29. This means that in a neutral copper atom, there are also 29 electrons that surround the nucleus in electron shells.

In a piece of pure copper, all of the atoms are identical and have the same number of protons, neutrons, and electrons. This is because the copper atoms are all of the same isotope, meaning they have the same number of neutrons as well as protons. Isotopes are atoms of the same element that have different numbers of neutrons, but in the case of copper, there is only one stable isotope, which means all copper atoms have the same number of neutrons.

Pure copper is composed of only one type of atom, which is copper. Copper has a well-defined atomic number (29) that specifies the number of protons present in the nucleus of each copper atom. Since atoms are electrically neutral, the number of electrons present in the copper atoms is also equal to the atomic number, 29.

Therefore, all atoms in a piece of pure copper have the same atomic number and the same number of electrons.

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The statement that is not true is that; The IE of Mg Is lower than that of sodium. Option A

We know that the ionization energy has to do with the energy that is required in order for an electron to be able to leave the outermost shell of an atom.

In this case, we know that the ionization energy decreases down the group but it does increase across the period. We now have to look at the options. It is clear that sodium would have a lower ionization energy than magnesium.

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Answer:

Atoms are electrically neutral because the number of protons, which carry a 1+ charge, in the nucleus of an atom is equal to the number of electrons, which carry a 1- charge, in the atom. The result is that the total positive charge of the protons cancels out the total negative charge of the electrons so that the net charge of the atom is zero. Most atoms, however, can either gain or lose electrons; when they do so, the number of electrons becomes different from the number of protons in the nucleus. The resulting charged species is called an ion.

Cations and anions

When a neutral atom loses one or more electrons, the total number of electrons decreases while the number of protons in the nucleus remains the same. The result is that the atom becomes a cation—an ion with a net positive charge.

The opposite process can also occur. When a neutral atom gains one or more electrons, the number of electrons increases while the number of protons in the nucleus remains the same. The result is that the atom becomes an anion—an ion with a net negative charge. We can illustrate this by examining some very simple cations and anions, those formed when a single hydrogen atom loses or gains an electron.

Note: Hydrogen is actually somewhat unusual in that it readily forms both cations and anions. Most elements much prefer to form only one or the other. In terms of its electron configuration, can you explain why hydrogen can form both cations and anions? Feel free to post in the comments at the end of the article!

A hydrogen cation, a hydrogen atom, and a hydrogen anion.

A hydrogen cation, a hydrogen atom, and a hydrogen anion.

Classification cation neutral atom anion

No. of protons 111 111 111

No. of electrons 000 111 222

Net charge 111++plus 000 111-−minus

If a neutral hydrogen atom ( \text{H}Hstart text, H, end text, center) loses an electron, it becomes a hydrogen cation ( \text{H}^+H  

+

start text, H, end text, start superscript, plus, end superscript, left). Conversely, if the neutral \text{H}Hstart text, H, end text atom gains an electron, it becomes a hydrogen anion ( \text{H}^-H  

−

start text, H, end text, start superscript, minus, end superscript, right), also known as a hydride ion. Image credit: adapted from Boundless Learning, CC BY-SA 4.0.

In the center column, we have a diagram of a single, neutral hydrogen atom. It contains one proton and one electron; thus, its net charge is zero. If hydrogen loses its electron, it forms the cation \text{H}^+H  

+

start text, H, end text, start superscript, plus, end superscript (left column). The \text{H}^+H  

+

start text, H, end text, start superscript, plus, end superscript cation has a net charge of 1+ from the one proton in the nucleus since there are no electrons to cancel out the positive charge. If neutral hydrogen gains an electron, it forms the anion \text{H}^-H  

−

start text, H, end text, start superscript, minus, end superscript (right column). The \text{H}^-H  

−

start text, H, end text, start superscript, minus, end superscript anion has a net charge of 1- because it has one extra electron compared to the total number of protons.

Explanation: Hopes this gives a better explanation on them!

Answer:

300 meters for 30 seconds

Explanation:

10*30= 300 therefore giving you your answer.

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1. C

2. D (I’m not entirely sure)

3.energy can neither be created nor destroyed, only change forms.

4. C

5. A

6. C

I’ve researched and tried to answer these questions correctly.

Answer:

1.c

2.a

3.created or destroyed

4.c

5.a

6.c

Explanation:

thanks me later

Answer:

Best regards.

Explanation:

Hello,

In this case, we relate the heat, mass, heat capacity and temperature when a thermal change is carried out as shown below:

\(Q=mCp(T_{final}-T_{initial})\)

Now, for the given data, we compute the absorbed heat (due to the temperature increase) as follows:

\(Q=15.0g*0.900\frac{J}{g^oC}*(350^oC-25^oC) \\\\Q=4.39x10^3J=4.39kJ\)

Best regards.

Answer:

4,387.5 J was absorbed

Explanation:

Calorimetry is the part of physics that is responsible for measuring the amount of heat generated or lost in certain physical or chemical processes.

In this way, there is a direct proportional relationship between heat and temperature. Thus, the amount of heat received or transferred by a body when it undergoes a temperature variation (Δt) without there being a change of physical state (solid, liquid or gaseous) is calculated using the following expression:

Q = c * m * ΔT

Where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

In this case:

Replacing:

Q= 0.900 \(\frac{J}{g*C}\) *15 g * 325 °C

Q=4,387.5 J

4,387.5 J was absorbed

Answer: Entropy

Explanation: Entropy. A measure of the level of disorder of a system is entropy, represented by S

Hoped this helped!!!!

The boiling point of a substance is also called the saturation temperature. It is the temperature at which a substance shows transition from liquid to gaseous state.

The boiling point of a liquid is defined as the temperature at which its vapour pressure becomes equal to the atmospheric pressure. It is at this temperature a liquid starts to boil.

The boiling point is highly dependent on the intermolecular forces of a compound. The compounds with stronger intermolecular forces, higher masses and less branching have high boiling points.

Thus the boiling point of a compound is affected by many factors.

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Answer

7.53% 97% if you divide it you can get the answer

Explanation:

Frochrabonloroluces is an incorrectly spelled term. I believe you might be referring to "chlorofluorocarbons" (CFCs), which are chemical compounds that have been known to pollute the atmosphere.

CFCs are a class of compounds that contain chlorine, fluorine, and carbon atoms. They are known for their ozone-depleting properties and have been widely used in refrigeration, air conditioning, foam manufacturing, and aerosol propellants. When released into the atmosphere, CFCs break down and release chlorine atoms, which can then react with ozone molecules, causing the depletion of the ozone layer. This ozone layer depletion has detrimental effects on the environment and human health, including an increase in harmful ultraviolet (UV) radiation reaching the Earth's surface.
Due to these harmful effects, the use of CFCs has been significantly reduced, and they have been replaced by less harmful alternatives, such as hydrofluorocarbons (HFCs) and hydrochlorofluorocarbons (HCFCs). The global efforts to phase out CFCs are primarily guided by the Montreal Protocol, an international treaty designed to protect the ozone layer.
In conclusion, CFCs are chemical compounds that have been known to pollute the atmosphere and contribute to the depletion of the ozone layer. This has led to increased efforts to phase out their use and find more environmentally friendly alternatives.

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The combine mass of the sled and the rider, given that each dog pulled with a force of 30 N is 200 Kg

We know that force is related to mass and acceleration according to the following formula:

Force (F) = mass (m) × acceleration (a)

F = ma

With the above formula, we can determine the combined mass of the sled and rider. Details below.

From the question given above, the following data were obtained:

The combined mass can be obtained as follow:

Force = mass × acceleration

240 = mass × 1.2

Divide both sides by 1.2

Mass = 240 / 1.2

Mass = 200 Kg

Thus, the combine mass is 200 Kg

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