You are task to make sandwiches for your class of 15 students, you are given a sliced bread with 46 slices, and a pack of slice cheese with 16 slice. How many sandwiches can you make?

Answer: Johannes Kepler

Answer:

i believe the answer us kepler

Explanation:

Answer:

D.

Explanation:

To find the concentration of sulfide ion when hydroxide ion begins to precipitate, we need to determine the point at which the reaction between sodium sulfide and iron(III) nitrate produces a precipitate.

This reaction can be represented by the following balanced equation: Na2S(aq) + Fe(NO3)3(aq) → FeS(s) + 2NaNO3(aq) First, let's write the balanced equation for the reaction between potassium hydroxide and iron(III) nitrate:

3KOH(aq) + Fe(NO3)3(aq) → Fe(OH)3(s) + 3KNO3(aq)

From the balanced equation, we can see that for every 3 moles of potassium hydroxide (KOH), we get 1 mole of Fe(OH)3(s) precipitate.

Therefore, when hydroxide ion begins to precipitate, the concentration of sulfide ion will be equal to the concentration of potassium hydroxide. Given that the concentration of sodium sulfide is 1.27×10^(-2) M and the concentration of potassium hydroxide is 1.35×10^(-2) M, the concentration of sulfide ion [S^2-] at the point of precipitation is also 1.35×10^(-2) M. Therefore, the concentration of sulfide ion when hydroxide ion begins to precipitate is 1.35×10^(-2) M.

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When a current of 4.67 A is passed through a Cu(NO₃)₂ solution for 1.70 hours, approximately 0.303 grams of copper is plated out of the solution, following Faraday's law of electrolysis.

To calculate the amount of copper plated out, we need to use Faraday's law of electrolysis, which states that the amount of substance deposited on an electrode is directly proportional to the quantity of electricity passed through the electrolyte. The formula to calculate the mass of a substance plated out is:

Mass = (Current × Time × Atomic mass) / (Charge per mole of electrons)

First, let's calculate the charge per mole of electrons for Cu²⁺ ions. Since Cu(NO₃)₂ dissociates into Cu²⁺ and 2NO₃⁻ ions, the charge per mole of electrons is 2.

Next, let's convert the current from amperes to coulombs using the formula:

Charge = Current × Time

Plugging in the values, we have:

Charge = 4.67 A × 1.70 hours × 3600 seconds/hour = 28,574 C

Now, we can calculate the mass of copper using the formula:

Mass = (Current × Time × Atomic mass) / (Charge per mole of electrons)

The atomic mass of copper is approximately 63.55 g/mol.

Mass = (4.67 A × 1.70 hours × 3600 s/hour × 63.55 g/mol) / 2

Simplifying the equation gives us:

Mass ≈ 0.303 grams

Therefore, after passing a current of 4.67 A through a Cu(NO₃)₂ solution for 1.70 hours, approximately 0.303 grams of copper is plated out, as determined by Faraday's law of electrolysis.

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Answer:

Explanation:

Im sorry all i know is that #3 is for sure combustion

1)  0.0089 moles of hydrogen is produced

2)  0.00445 moles of oxygen is produced

3) 2.7 * 10^21 molecules of oxygen is produced

We can see form the question that the reaction equation is;

2H20 ---->  2H2 + O2

The number of moles of water can be obtained from;

1 mole of water would have a volume of 22400 mL

x moles of water would have a volume of 200 mL

x = 200 * 1/22400

x = 0.0089 moles

If 2 moles of H2 produced 2 moles of H2 from the equation then the moles of H2 produced is 0.0089 moles.

If 2 mole of water produced 1 mole of oxygen

0.0089 moles of water produced x moles of oxygen

x = 0.00445 moles

The number of the molecules of oxygen produced is obtained from;

1 mole of oxygen contains 6.02 * 10^23 molecules

0.00445 moles contains  0.00445 moles *  6.02 * 10^23 molecules/1 mole

= 2.7 * 10^21 molecules

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Answer: C

Explanation: because Pangaea broke apart and made smaller continents.

If the half-life of a reaction is constant, the reaction follows first-order kinetics, meaning that the rate of the reaction is proportional to the concentration of the reactant raised to the power of one.

What is Half Life?

Half-life is the time required for half of the amount of a substance undergoing decay or transformation to react or decay. It is a characteristic property of a given radioactive or chemical substance, and it is defined as the time it takes for half of the initial amount of the substance to decay or react.

Chemical reactions can have different orders, depending on how the rate of the reaction changes with respect to the concentration of the reactants. The reaction order describes how the rate of the reaction depends on the concentration of the reactants.

Therefore, the reaction order that best fits the observations is first-order.

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Answer: They are are simular because when the wax cools down its not hot  or it cools down it is the same with hot water it cools after along while.

Explanation:

The ways to  make a skit are:

In skit making, one can start by coming up with humorous concepts for your skit. Write out your scenario, practice it, and then perform it in front of an audience or record it. Then Continue to create fresh drafts.

Note that one can ask someone you trust's opinion should see your sketch. Then make a note of what people found amusing and not amusing.

Therefore, skit  is seen as short comedy show that can be performed by second graders.

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The triple point can be seen from the graph that has been attached here.

The triple point is a special combination of temperature and pressure where the equilibrium of a substance's three phases—solid, liquid, and gas—occurs. The transition between phases happens with no discernible net change in the substance because the solid, liquid, and gas phases are in perfect equilibrium at the triple point.

A crucial reference point in thermodynamics, the triple point is frequently used to specify temperature scales and calibrate thermometers. Each substance has a specified value for temperature and pressure.

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[Kr]5s²4d10⁵p² represents iodine element. The fundamental components of matter are thought to be the elements.

A material is considered an element if it cannot be divided into two or even more simpler compounds by any kind of chemical process, including the use of light or warmth. For instance, when melting the chunk of gold, it nevertheless melts but remains as the precious metal element. 

The fundamental components of matter are thought to be the elements. There are currently 118 known elements, 94 of which are found in nature while the remaining 24 are created artificially. [Kr]5s²4d10⁵p² represents iodine element.

Therefore,  [Kr]5s²4d10⁵p² represents iodine element.

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The compound that reacts most rapidly with HNO3/H2SO4 is nitrobenzene (C).

Nitrobenzene has a relatively low boiling point of 210°C and is highly soluble in organic solvents, making it particularly reactive with HNO3/H2SO4. The nitro group of the nitrobenzene molecule is highly reactive, and when it comes into contact with a strong acid, it undergoes an SN2 reaction.

This reaction involves the replacement of the nitro group with an anion, resulting in a product of nitrobenzoic acid and a hydrogen ion.

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Answer:   Y  21.38 % , Al  32.44 % and O 46.16 %

Explanation: Molar mass of YAl5O12 is 88.91 + 5·26.98+12·16

= 415.81 g/mol

  m-% ( Y) = 88.91 / 415.81 = 21.38 % ,     m-% (Al) = 5·26.98 / 415.81 =

  32.44 %  , rest is Oxygen

While cirrocumulus clouds may have some minor impact on the Earth's energy balance by reflecting sunlight, their role in the greenhouse effect is negligible compared to the greenhouse gases themselves.

Cirrocumulus clouds do not directly play a significant role in the greenhouse effect. The greenhouse effect refers to the process by which certain gases in the Earth's atmosphere trap heat from the sun, leading to an increase in the planet's temperature. The primary greenhouse gases responsible for this effect are carbon dioxide, methane, and water vapor.Cirrocumulus clouds, also known as high-level clouds, are composed of ice crystals and form at altitudes above 20,000 feet. They are thin, white, and often appear as small, rounded puffs or ripples in the sky. While these clouds can reflect some sunlight back into space, their overall impact on the greenhouse effect is minimal.In contrast, low-level clouds such as stratus or cumulus clouds can have a more significant influence on the greenhouse effect. These clouds have a higher potential to reflect incoming solar radiation and cool the Earth's surface, thus partially counteracting the warming effect caused by greenhouse gases.

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During the cell cycle, compounds called cyclins increase and decrease in a regular pattern. They regulate the stages of cell division and growth.

Cell cycle development is regulated in element by way of the sequential pastime of various cyclins. The cyclins are regulatory subunits that bind, prompt and provide substrate specificity for their catalytic companion serine-threonine kinases, collectively called cyclin-established kinases.

Cyclins are a family of proteins that don't have any enzymatic interest of their personal however spark off CDKs through binding to them.

S cyclins are involved inside the induction of DNA replication and early stages of mitosis. Their stages upward push at the beginning of S phase and fall in early mitosis.

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Answer:

they are funny and unite.

Thank You

Air is mixture.

But pure air compound .

Explanation:

So the answer is Compound.

Please Mark As Brain list

Answer:

the left one

Explanation:

heavier means it goes faster

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

mass = Density × volume

From the question we have

volume = 55 mL

density = 1.26 g/mL

mass = 1.26 × 55 = 69.3 g

We have the final answer as

Hope this helps you

Answer:

A

Explanation:

hope this helps you have a good day

The mass, in grams, of H₂O is produced in the decomposition of ammonium nitrate is 72.06 grams.

Mass of any substance will be calculated by using their moles as:

n = W/M, where

W = required mass

M = molar mass

Given chemical reaction is:

NH₄NO₃ → N₂O + 2H₂O

Moles of 160.1 g of NH₄NO₃ = 160.1g / 80.03g/mol = 2moles

From the stoichiometry of the reaction, it is clear that:

1 moles of NH₄NO₃ = produce 2 moles of H₂O

2 moles of NH₄NO₃ = produce 2×2=4 moles of H₂O

Mass of H₂O will be calculated as:

W = (4mol)(18.01 g/mol) = 72.04 grams (72.06 approx)

Hence, option (4) is correct.

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Answer:

A change of state when a substance changes physical form but not in molecule make up. The molecules do not change into something different they just gain or lose energy and movement. Ice, liquid water, and steam are all the same substance—water or H2O.

Explanation:

Answer:

0.694 cents per second

Explanation:

25x100=2500 cents per hour, 2500/60 = 41.67 per minute and 41.67/60=0.694 cents per second

Answer:

A.

It contains three times as many hydrogen atoms as carbon atoms.

B.

It consists of 75% hydrogen by mass.

C.

Each molecule contains exactly four atoms.

D.

Each carbon atom is bonded to three hydrogen atoms.

Explanation:

it has 75% Hydrogen by mass

If we assume CH3 as 100% which is 4 parts.

Then 3 parts corresponds to Hydrogen which is 75% and remains is carbon,25 %

Answer:

pH = 11.37

Explanation:

To find the pH of a solution, we can use the formula:

pH = -log[H+]

Let's plug in what we know.

pH = -log(4.3 x \(10^{-12}\))

Evaluate the log.

pH = 11.37

Hope this helps!

The given statement Cis- and trans-cycloalkanes have the same molecular formula but different spatial arrangement of their atoms is true.

Cis- and trans-cycloalkanes are two types of geometric isomers that exhibit different arrangements of substituent groups around a cyclic structure. They have the same molecular formula, meaning they contain the same number of atoms of each element, but their connectivity differs.

In cis-cycloalkanes, the substituent groups are on the same side of the cyclic structure, while in trans-cycloalkanes, the substituent groups are on opposite sides. This spatial arrangement affects the physical and chemical properties of these isomers.

For example, cis-cycloalkanes generally have higher boiling points and melting points compared to their trans counterparts due to increased intermolecular forces resulting from the proximity of the substituent groups. Additionally, the different spatial arrangements can lead to different reactivities in chemical reactions.

Therefore, cis- and trans-cycloalkanes possess the same molecular formula but exhibit distinct connectivity and spatial arrangements.

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Answer:

The north atlantic contains the warmest and saltiest water of the major oceans, the southern ocean is the coldest, the north pacific has the lowest average salinity. This density signature is locked into the water parcel when it sinks

Explanation:

i think

Answer:

a solid has definite volume and shape, a liquid has definite volume but no definite shape, and a gas has neither a definite volume nor shape the change from solid to liquid usually does not significantly change the volume of a substance