2) (3 pts) Convert 85 oF to oC.

The force applied to the rocket by its engines remains constant as it moves up, while its mass decreases, resulting in an increase in acceleration.

Newton's laws of motion provide an explanation for the acceleration of a rocket as it moves away from the ground. According to Newton's second law, the force exerted on an object is directly proportional to its acceleration, and the force required to move an object increases as its mass increases.

In the case of a rocket, its mass decreases as it consumes fuel, which means that less force is required to move it as it climbs higher into the atmosphere.

As the rocket moves up, its acceleration increases while the force exerted on it remains constant. Newton's second law of motion explains that the acceleration of an object is directly proportional to the force applied to it. According to the second law of motion, an object's acceleration is equal to the force exerted on it divided by its mass.

This means that as the rocket climbs higher and its mass decreases due to the consumption of fuel, less force is required to accelerate it, and so its acceleration increases. In other words, the rocket's acceleration is increasing because the force required to move it is decreasing due to the decreasing mass of the rocket.

This phenomenon is also related to Newton's third law of motion, which states that every action has an equal and opposite reaction. The force exerted by the rocket's engines is balanced by an equal and opposite force exerted on the rocket by the exhaust gases, according to this law.

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The equilibrium concentrations of the reactants were found to be [Br₂] = 3.6 × 10⁻³ M and [Cl₂] = 5.1 × 10⁻³ M the equilibrium constant is Kc = 7.1 then the value of [BrCl] is 2.5×10⁻⁶M

Reactants are raw materials that react with one another and form products

Here given reaction is

Br2(g) + Cl2(g) ⇌ 2BrCl(g)

Equilibrium concentrations of the reactants were found to be

[Br₂] = 3.6 × 10⁻³ M and [Cl₂] = 5.1 × 10⁻³ M and the equilibrium constant is Kc = 7.1.

We have to calculate value of [BrCl] = ?

Then for to calculation of [BrCl] then the formula is

Kc = [BrCl]/[Br₂]×[Cl₂]

Rearranging the equation,

[BrCl] = [Br₂]×[Cl₂]/Kc

[BrCl] = 3.6 × 10⁻³ M×5.1 × 10⁻³ M/7.1

[BrCl] = 2.5×10⁻⁶M

The value of [BrCl] is 2.5×10⁻⁶M

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Answer:

A

Explanation:

Answer:

pressure of the gas P2=0.4bar

Explanation:

According to Boyles law which states that the pressure of a given mass of an ideal gas is inversely proportional to its volume at a constant temperature.

Boyle's Law gives the relationship between the Pressure and Volume of a gas.

It can be expressed as;

P1V1 = P2V2

P1V1 = P2V2

Where

P1 = Initial Pressure

V1 = Initial Volume

P2 = Final Pressure

V2 = Final Volume

Given:

V1= 2m^3

V2= 5m^3

P1= 1bar

P2=?

P1V1=P2V2

P2=P1V1/V2

Then let us substitute,we have

P2= (1*2)/5

Therefore, pressure of the gas P2=0.4bar

Mass of the pure silver deposited on a metal object made into the cathode of the cell is calculated to be 0.0217 gm.

The process of using electrodeposition to coat an object in a layer of metal is called electroplating .

As we know that, Q = I * t

=0.270 * 72

= 19.44 C

Here Q is quantity of electricity , I is current in amperes = 0.270 A (given)

t is time in seconds (72.0 sec)

As 96500 Coulomb of electricity electrolyzes 1 mole of Ag

then,19.44 C of electricity deposits,

=1/96500 * 19.44

= 0.000201 moles of Ag

Mass of Ag is = number of moles * molar mass

= 0.000201 * 108

= 0.0217 gm

Thus, mass of pure silver deposited on a metal object made into the cathode of the cell is  0.0217 gm.

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The terms that best describe the isomeric relationship between staggered and eclipsed ethane are B: "conformational, achiral, diastereomers."

An isomeric relationship refers to the relationship between two or more chemical compounds having the same molecular formula but differing in the arrangement of their atoms. Isomers can be classified into different types such as structural isomers, stereoisomers, and conformational isomers based on the differences in their molecular structure.

In the context of this question the isomeric relationship between staggered and eclipsed ethane is described as "conformational, achiral, diastereomers.

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The molecule that is drawn in a conformation that has a proton and a leaving group anti-periplanar is H₂C, Br.

The A, B, C, and D bond angles of a molecule are referred to as anti-periplanar, or antiperiplanar, in organic chemistry. The dihedral angles of the A–B and C–D bonds in this conformer are larger than +150° or less than 150°. In textbooks, the term "anti-periplanar" is frequently used to refer to a strictly anti-coplanar structure with a 180° AB CD dihedral angle. The anti-periplanar functional groups will be 180° apart from one another and in a staggered configuration in a Newman projection of the molecule.  

Conformation is an essential factor in predicting reactivity in organic molecules. The anti-periplanar conformation of a molecule is one that occurs when two atoms in a molecule are in the same plane and are separated by 180 degrees. In this case, the proton and leaving group are placed in a perpendicular plane to the atoms directly in between them. This is the most stable conformer of the molecule. A significant factor in predicting reactivity in organic molecules is conformation. In this case, the molecule H₂C, Br is drawn in a conformation that has a proton and a leaving group anti-periplanar.

Therefore, the correct option is H₂C, Br.

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There are 2.64 × 1022 molecules of sucrose present in this serving of fruit dessert containing 15.0 g of sugar.

To determine the number of molecules of sugar present in the serving, we need to calculate the number of moles of sugar and then convert it to the number of molecules.

Given:

Mass of sugar (sucrose) = 15.0 g

Molar mass of sucrose (C12H22O11) = 342 g/mol

First, calculate the number of moles of sugar using the formula:

Number of moles = Mass of substance / Molar mass

Number of moles of sugar = 15.0 g / 342 g/mol ≈ 0.0439 mol

Next, we use Avogadro's number, which states that there are approximately 6.022 × 10^23 molecules in one mole of a substance. Therefore, to find the number of molecules of sugar:

Number of molecules = Number of moles × Avogadro's number

Number of molecules of sugar = 0.0439 mol × 6.022 × 10^23 molecules/mol ≈ 2.64 × 10^22 molecules

Therefore, there are approximately 2.64 × 10^22 molecules of sugar present in this serving.

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Accοrding tο the equatiοn 0.4006 mοl οf PF₃ will be required tο prοduce 27.5 grams οf PF₃.

Mοl is a unit οf measurement fοr the amοunt οf a substance. It is used tο measure the amοunt οf a particular element οr cοmpοund in a sample. Mοl is equal tο the number οf atοms, mοlecules, οr οther units in a sample. The size οf a mοl is determined by Avοgadrο's number, which is 6.022 x 10²³.

We first need tο calculate the mοlecular weight οf PF₃. This is dοne by adding up the atοmic masses οf the three atοms in the mοlecule.

                        P: 30.97 g/mοl

                            F: 18.99 g/mοl

Therefοre, PF₃ has a mοlecular weight οf:

                        30.97 + 18.99 + 18.99

                              = 68.95 g/mοl

Tο calculate the mοles οf PF₃ required tο prοduce 27.5 grams οf PF₃, we divide the mass οf PF₃ (27.5 g) by the mοlecular weight οf PF₃ (68.95 g/mοl):

                          27.5 g / 68.95 g/mοl

                        = 0.4006 mοl οf PF₃

Therefοre, 0.4006 mοl οf PF₃ will be required tο prοduce 27.5 grams οf PF₃,

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Chlorofluorocarbons (CFCs) are man-made chemicals containing chlorine and fluorine that cause ozone molecules to break down. Thus, option B is the answer.

Chlorofluorocarbons are non-toxic, synthetic compounds that contain atoms of Chlorine, Fluorine and Carbon. They are commonly used in the manufacture of aerosol sprays and are also used as solvents and refrigerants. CFCs were first introduced in 1928 by General Motors Company for its refrigerators.

While CFCs are very safe to use in most applications and are stable in the lower atmosphere, these chemicals when released to the upper atmosphere can cause significant reactions. CFCs when released into the upper atmosphere can lead to the destruction of the ozone molecules followed by the release of the UV radiation into the atmosphere.

Thus, CFCs are man-made chemicals which cause ozone molecules to break down.

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A balanced equation may be used to describe this reaction:

HC=C(aq) + H2O(l) ⇌ H3C+C-(aq) + OH-(aq)

The Brnsted-Lowry hypothesis is an acid-base reaction theory that was separately proposed in 1923 by Johannes Nicolaus Brnsted and Thomas Martin Lowry. In a chemistry, a Brnsted-Lowry base is a molecule or ion that accepts a hydrogen ion. Because a hydrogen ion is often referred to as a proton, acids and bases are proton donors and acceptors, according to the Brnsted-Lowry definition.

Here,

The acetylide ion (HC=C) acts as a Brønsted-Lowry base in water, accepting a proton from water to form an acetylene cation (H3C+C-):

HC=C + H2O ⇌ H3C+C- + OH-

This reaction can be written as a balanced equation:

HC=C(aq) + H2O(l) ⇌ H3C+C-(aq) + OH-(aq)

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The mass of the unknown element cobalt is obtained as 40 g. This can be seen from the calculation that we have in the solution.

If you have a compound that contains an unknown element, you can use the molar mass of the compound to find the relative atomic mass of the unknown element

We can see that the question has already given us the mass of the sample as we have and the percentage of the cobalt that we have in the sample.

50 = x/80 × 100

x = 50/100 × 80

= 40 g

Thus we would have a total of about 40 g of cobalt in the sample.

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Missing parts;

A sample of the compound weighs 80 grams.  If the mass percent of cobalt is 50%, How many grams of cobalt are in the sample?

Total mass of carbon must be decreasing in different step of carbon cycle because matter is conserved in the processes and reactions of carbon cycle. Carbon is a matter and it is the major constituent of living organisms.

Carbon cycle refers to processes where carbon move from the atmosphere to the biosphere and Earth and then back to the atmosphere.

It involves processes of using and reusing carbon again and again and it's conservation.

Carbon is an organic matter found in living organisms and total mass of carbon reduces because it is a matter that is conserved.

Carbon is released from that atmosphere, use for photosynthesis, plants and animals consume the plants. They defecate , respirate and carbondioxide is released during respiration.

Therefore,Total mass of carbon must be decreasing in different step of carbon cycle because because matter is conserved in the processes and reactions of carbon cycle. Carbon is a matter and it is the major constituent of living organisms.

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Distance 11.143 ft or thereabouts is Distance roughly how far the tree extends from its tip to its base.

Distance is the sum of an object's movements, regardless of direction. Distance can be defined as the amount of space an object has covered, regardless of its starting and ending position.

We obtain a quadratic equation by simplifying and expanding the left side:

2y^2 - 288y + 144 = 0

The quadratic formula is used to solve for y, and the result is: y = [288 (2882 - 4(2)(144)]

/(2(2))

y = [288 ± √58368]

y = 0.857 ft or /4 y = 84 foot

The only viable answer is: y 0.857 ft since y cannot be higher than 12 ft (the whole height of the tree).

The result of changing this number for y in the equation x + y = 12 ft is: x + 0.857 ft = 12 ft x 11.143 ft

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Answer:

B. OR C.

Explanation:

So, 1 mol of ethanol, C2H5OH contains 1 mol of atoms of O; 1 mol of formic acid, HCO2H contains 2 moles of atoms of O; and 1 mol of water, H2O contains 1 mol of atoms of O.

Answer: So, of the three compounds given, formic acid, HCO2H, contains the greatest number of moles of oxygen atoms.

The result of the computation when you follow the steps is 1.699.

A logarithm is a mathematical function that represents the exponent or power to which a specific base must be raised to obtain a given number. In simpler terms, it answers the question: "To what power must we raise a base number to obtain a certain value?"

What you should do is that on your calculator, you could press the logarithm key and then put in the value that has been shown and then the result would be displayed on your calculator.

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People refuse to answer questions from authorized Stats SA officials because they don't want to reveal confidential information.

An official Stats is an official who has the function of asking citizens for different information in order to establish general statistics for all citizens.

Some people refuse to answer questions out of mistrust, because they don't want to share personal information.

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Answer:

The high concentration of the iron ion ensures that the reaction is favored to go to the right

Explanation:

According to Le Chateliers principle, when a constraint such as a change in concentration, pressure or volume is imposed on a chemical system in equilibrium, the system will readjust itself in order to annul the constraint. This is done by shifting the position of equilibrium, either to the left hand side or the right hand side depending on the requirement of the system based on the imposed constraint. Equilibrium his now reestablished in the system as a result of this readjustment.

Since there is a high(excess) concentration of iron in the system, it can be safely assumed that the equilibrium concentration of the FeNCS2+ is equal to the initial concentration of SCN- ion present. This implies that the equilibrium position moves towards the right hand side according to Le Chateliers principle.

Answer:

\(C_3H_6\)

Explanation:

Hello!

In this case, since the empirical formula is the smallest representation of the molecular formula, it is known that the times in which the empirical formula is into the molecular formula is a whole number and is computed by dividing the molar mass of the molecular formula by that of the empirical formula as shown below:

\(\frac{42.08g/mol}{12.01+1.01x2}= \frac{42.08g/mol}{14.03g/mol}=3\)

Thus, the molecular formula times the empirical formula by 3 to obtain:

\(C_3H_6\)

Regards!

Answer:

\(1190\ \text{mL}\)

Explanation:

\(M_1\) = Initial Concentration of KCl = 2.7 M

\(V_1\) = Volume of KCl = 1 M

\(M_2\) = Final concentration of KCl = 1 M

\(V_2\) = Amount of water

We have the relation

\(M_1V_1=M_2V_2\\\Rightarrow V_2=\dfrac{M_1V_1}{M_2}\\\Rightarrow V_2=\dfrac{2.7\times 700}{1}\\\Rightarrow V_2=1890\ \text{mL}\)

The amount of water that is to be added is \(1890-700=1190\ \text{mL}\).

Answer:

Explanation:

A calorimeter is an instrument used for measuring the heat of reactions and heat capacity. A calorimeter should contain an insulating cover, a thermometer, styrofoam cups (you could have that both on the inside and the outside in the case of a styrofoam calorimeter) and you could also have a conductivity probe (in the form of ignition wires and bulb).

A calorimeter is the analytical device used to measure the heat of the reaction. The construction of calorimeter requires cover, paper cup, thermometer, styrofoam cup, and conductivity probe.

In a chemical reaction, the amount of heat released or absorbed by the reaction helps in the analysis of various parameters. The calorimeter measures the heat of the reaction.

The construction of a calorimeter requires:

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Answer:

Gas D

Explanation:

liters at 30 °C

Answer:

Explanation:

a piano white

The best instrument used to magnify small objects up to 20 times is a  compound microscope. Therefore, option B is correct.

The optical microscope, also known as a light microscope, creates enlarged pictures of tiny objects by using visible light and a set of lenses.

Viewing tiny samples that are invisible to the human eye is done with compound microscopes. Normally, a slide with these samples on it is used in a microscope. When utilizing a stereo microscope, bigger items like rocks or flowers may fit beneath the microscope with greater room, and slides are not necessary.

Because it has two different types of lenses that work together to magnify an item, the conventional light microscope used in laboratories is referred to as a compound microscope.

Thus, option B is correct.

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The glowing splint in the reaction of hydrogen gas and oxygen gas to form water provides the activation energy for the reaction.

A chemical reaction involves the combination of two or more substances to yield a new substance which is different from the starting materials. It may also involve the break up a substance.

Since energy is required for a chemical reaction to take place, the glowing splint in the reaction of hydrogen gas and oxygen gas to form water provides the activation energy for the reaction.

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The piece of evidence that best identifies the type of reaction as nuclear or chemical is: Chemical, because a new substance is formed. Option 4

In this scenario, the observation that a new substance is formed is a key characteristic of a chemical reaction. Chemical reactions involve the rearrangement of atoms to form different substances with distinct properties. The formation of a new substance indicates a chemical change has occurred.

The other pieces of evidence listed do not necessarily point to a nuclear reaction:

Chemical, because energy is released during the reaction: Energy can be released in both nuclear and chemical reactions, so this observation alone is not sufficient to determine the type of reaction.

Nuclear, because energy is released during the reaction: While energy can be released in nuclear reactions, it is not exclusive to them. Chemical reactions can also release energy, such as in exothermic reactions.

Nuclear, because the mass decreased after the reaction: This observation suggests a change in mass, which could be indicative of a nuclear reaction. However, it is important to consider that chemical reactions can also involve changes in mass, such as the formation of gases or dissolution of a solid.

Overall, the most conclusive evidence to identify the type of reaction is the formation of a new substance, which aligns with a chemical reaction.

Option 4

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Answer:

is easy to poiling

Explanation:

also is dificult to melting

The concentration of the NaCl solution after evaporation is 0.792 M.

To solve this problem, we can use the formula:

C1V1 = C2V2

Where C1 and V1 are the initial concentration and volume, and C2 and V2 are the final concentration and volume.

Given:

C1 = 0.556 M

V1 = 0.150 L

V2 = 0.105 L

We can rearrange the formula to solve for C2:

C2 = (C1V1)/V2

Substituting the given values, we get:

C2 = (0.556 M x 0.150 L) / 0.105 L

C2 = 0.792 M

Therefore, the concentration of the NaCl solution after evaporation is 0.792 M.

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Answer:

It has 17 protons, 17 electrons, and 18 neutrons/ 35 protons, 35 electrons, and 17 neutrons. 21. Phosphorus-33 (atomic number 15) contains 18 neutrons/ 18 protons