Is it possible for a rock to be shaped by forces in the Earth. This picture could be described as a/an

Answer:  Chemistry, like physics and biology, is a natural science. In fact, there is considerable overlap between chemistry and these other disciplines. Chemistry is a science that studies matter. This includes atoms, compounds, chemical reactions, and chemical bonds.

Explanation:  Chemistry is the scientific study of the properties and behavior of matter. It is a natural science that covers the elements that make up matter to the compounds made of atoms, molecules, and ions: their composition, structure, properties, behavior, and the changes they undergo during a reaction with other substances.

Mass of Oxygen : 18.8 g

Reaction(balanced) :

4Fe + 3O₂ → 2Fe₂O₃

mass Fe = 43.7 g

mol Fe(MW= 55,845 g/mol) :

\(\tt mol=\dfrac{mass}{MW}\\\\mol=\dfrac{43.7}{55.845}\\\\mol=0.783\)

mol O₂ : mol Fe = 3 : 4, so mol O₂ :

\(\tt \dfrac{3}{4}\times 0.783=0.5873\)

Mass O₂(MW=32 g/mol) :

\(\tt mass=mol\times MW\\\\mass=0.5873\times 32\\\\mass=18.7936~g\approx 18.8\)

Or simply you can Conservation of mass, where the masses before and after the reaction are the same

mass reactants=mass products

mass iron+mass oxygen=mass  iron (III) oxide

43.7 g + mass oxygen=62.5 g

mass oxygen = 62.5 - 43.7 = 18.8 g

When the precipitate formed by the reaction between hydrochloric acid (HCl) and solid zinc (Zn) is washed, the soluble species that is typically removed is chloride ions (Cl^-).

In the reaction between HCl and Zn, zinc reacts with hydrochloric acid to produce zinc chloride (ZnCl₂) and hydrogen gas (H₂):

Zn(s) + 2HCl(aq) → ZnCl₂(aq) + H₂(g)

The zinc chloride formed in the reaction is soluble in water. However, after the reaction, there may still be excess HCl and other impurities present in the precipitate. Washing the solid precipitate with water helps remove these impurities, including any remaining HCl.

As water is added and the precipitate is washed, it dissolves the soluble species, including the chloride ions (Cl^-), leaving behind the purified solid. The water washes away the soluble chloride ions along with other water-soluble impurities, resulting in a cleaner solid product.

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Answer:

Maintain constant velocity

Answer: maintain a constant velocity until acted on by another force

Explanation: i took the test

To obtain accurate results, it is crucial to check for black precipitate in the bottom of the container during an H2S test.

During an H2S test, it is essential to look for black precipitate (FeS) in the bottom rather than on the surface. This is because FeS is denser than water and tends to sink to the bottom due to gravity. The H2S test involves adding a solution containing lead acetate to the sample, and if H2S is present, it reacts with the lead acetate to form a black precipitate of FeS.
f the FeS forms on the surface, it may not be a true reflection of the H2S levels in the sample as it could be due to other factors such as air bubbles or agitation. Therefore, it is crucial to check the bottom of the test tube or container for the presence of black precipitate, which indicates the amount of H2S present in the sample.
Also, it is important to note that the color of the precipitate may vary depending on the concentration of H2S in the sample. Higher concentrations of H2S can result in a thicker and darker black precipitate. In summary, to obtain accurate results, it is crucial to check for black precipitate in the bottom of the container during an H2S test.

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Answer:

p4

Explanation:

Answer:

132g

Explanation:

CH4= 12+4=16  

moles= m/Mr    moles=48/16=3 mol

CO2= Mr=44

there are the same number of moles as methane:

Mass= Mrxmoles

44x3=132g

The mass of the carbon dioxide produced by the combustion of the 48 g of methane is equal to 132 g.

Combustion reaction involves the complete oxidation of the hydrocarbon such reactions generally release only carbon dioxide and water as products.

A hydrocarbon undergoes combustion to produce carbon dioxide and water as the product. No other side products are formed in the combustion reaction.

The given combustion reaction of the methane can be written as follows:

CH₄   + 2 O₂ →  CO₂  +  2H₂O

Given the amount of methane for combustion = 48 g

The molar mass of methane = 16g/mol

The molar mass of the carbon dioxide, CO₂ = 44g/mol

16 grams of methane produce carbon dioxide = 44g

The  48 grams of methane will produce CO₂ = (44/16) ×48 = 132 g

Therefore, the mass of 132 g of carbon dioxide is produced by the combustion of 48g of methane.

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Answer:

The heat absorbed by the water is 228,948.48 J

Explanation:

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

In this way, between heat and temperature there is a direct proportional relationship (Two magnitudes are directly proportional when there is a constant so that when one of the magnitudes increases, the other also decreases; and the same happens when either of the two decreases .). The constant of proportionality depends on the substance that constitutes the body and its mass, and is the product of the specific heat and the mass of the body. So, the equation that allows to calculate heat exchanges is:

Q = c * m * ΔT

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

In this case:

Replacing:

Q= 4.184 \(\frac{J}{g*C}\) *855 g* 64 C

Solving:

Q= 228,948.48 J

The heat absorbed by the water is 228,948.48 J

Answer:

C

Explanation:

plum- pudding atomic model is an atom that had a positively charged medium, or space, with negatively charged electrons inside the medium.

The correct answer is (A) A description of atoms being balls of positive charge with electrons scattered outside.

Option (A) is correct because the atom was a sphere of positive charge with negatively charged electrons scattered around the atom like plums in a pudding.

So , Rest  options that are B , C and D are incorrect.

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The expected change in flow rate associated with a 1in. increase in pressure drop can be calculated as follows. The expected change in flow rate is the slope of the regression line of the equation y = bx + a. The change in flow rate, or y, is on the y-axis and the change in pressure drop, or x, is on the x-axis.

A regression line was fitted to the data by the method of least squares using Excel. The slope of the regression line is -0.0155. Therefore, for every 1in. increase in pressure drop, the flow rate is expected to decrease by 0.0155 m3/min. This is equivalent to a 1.55% decrease in flow rate for every 1in. increase in pressure drop.

The change in flow rate that can be expected when the pressure drop decreases by 5 in. is calculated as follows. The expected change in flow rate is still the slope of the regression line, which is -0.0155. Therefore, for a decrease of 5 in. in pressure drop, the expected change in flow rate is 0.0775 m3/min or 7.75% decrease in flow rate.

The expected flow rate for a pressure drop of 10 in. can be calculated as follows. Using the equation y = bx + a, where x = 10 and b = -0.0155, we get y = (-0.0155)(10) + a = -0.155 + a.

To find a, we use the point (6.92, 10.8), which is the mean of the data. Therefore, a = 6.92(0.0155) + 0.840 = 0.949. Hence, the expected flow rate for a pressure drop of 10 in. is y = (-0.0155)(10) + 0.949 = 0.794 m3/min.

The expected flow rate for a pressure drop of 12 in. can be calculated using the same equation, y = (-0.0155)(12) + 0.949 = 0.763 m3/min.

Given that P(Y > 0.835) = 0.8 and P(Y > 0.840) = 0.6, we can conclude that the probability of Y being greater than 0.835 and less than 0.840 is 0.2. This is because P(Y > 0.840) - P(Y > 0.835) = 0.6 - 0.8 = -0.2, which is the complement of the probability we are interested in. Therefore, P(0.835 < Y < 0.840) = 0.2.

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Answer:

Cr(NO3)3 (aq) +K3PO4 (s)

Explanation:

Answer:

26.2kPa is the partial pressure of nitrogen

Explanation:

Assuming the partial pressure of Carbon dioxide is 0.070atm

The total pressure of a mixture of 3 gases (CO2, O2 and N2) is:

Total pressure = Partial pressure CO2 + Partial pressure O2 + Partial pressure N2

0.070atm CO2 are:

0.070atm * (760mmHg / 1atm) 53.2mmHg

Replacing:

930mmHg = 53.2mmHg + 680mmHg + Partial pressure N2

Partial Pressure N2 = 196.8mmHg

In kPa -101.325kPa = 760mmHg-

196.8mmHg * (101.325kPa / 760mmHg) =

Answer:

Al(OH)3 + HNO3 = Al(NO3)3 + H2O - Chemical Equation Balancer.

Explanation:

Answer:

False for the first, true for second.

Explanation:

ATP is cellular energy and it needs to be recharged after it is used. That half dead is called adp.

The statement energy is released from ATP when it reacts with water to produce ADP is False, while the statement the information that cells need to direct their metabolic process is stored in RNA is True.

ATP is the energy source of cells generated by cellular respiration and anaerobic processes, while  RNA is a molecule obtain by the transcription process which is used to generate proteins during metabolic activities such as differentiation.

Therefore, with this data, we can see that ATP is the energy coin of cells, while cells generate RNA during transcription.

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Answer:

ide

Explanation:

the metal keeps its name in an ionic compound, the suffix of the nonmetal is changed to "ide" (ie sodium chloride, NaCl)

Answer:

O The core

Explanation:

Subatomic particles include electrons, the negatively charged, almost massless particles that nevertheless account for most of the size of the atom, and they include the heavier building blocks of the small but very dense nucleus of the atom, the positively charged protons and the electrically neutral neutrons. Which therefore means that the core is NOT a subatomic particle.

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Answer: The component that is missing from the process of photosynthesis is glucose. The correct option is B.

Explanation:

Why is photosynthesis?

Additionally, almost all the oxygen in the atmosphere is due to the process of photosynthesis. If photosynthesis ceased, there would soon be little food or other organic matter on Earth, most organisms would disappear, and Earth's atmosphere would eventually become nearly devoid of gaseous oxygen.

Photosynthesis is the process by which plants and other things make food. It is an endothermic (takes in heat) chemical process that uses sunlight to turn carbon dioxide into sugars that the cell can use as energy. As well as plants, many kinds of algae, protists and bacteria use it to get food

The main purpose of photosynthesis is to transform solar energy into chemical energy, which is then stored for later use. This mechanism primarily provides energy to the planet's life systems.

Therefore, the correct option is B, Glucose.

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If you started with 1.5 moles of H2 at STP, you would have approximately 33.6 liters of volume of hydrogen (H₂) gas.

To determine the number of liters of H2 you have, we need to consider the conditions under which the gas is being held (i.e. temperature and pressure), as well as the molar volume of H2 at those conditions.

At standard temperature and pressure (STP), which is 0°C (273.15 K) and 1 atm (101.325 kPa), the molar volume of any ideal gas is approximately 22.4 L/mol.

Therefore, at STP, 1.5 moles of H₂ would occupy approximately:

V = n x Vm = 1.5 mol x 22.4 L/mol = 33.6 L

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The complete question is below:

HOW MANY LITERS OF H2 DO YOU HAVE IF YOU START WITH 1.5 MOLES OF H2? (assume STP condition)

The electron in the energy level of 10 can absorb the photon with energy 5 and transition to the energy level of 15 (10 + 5), which is higher than the original energy level. This process is known as an excitation process.

Alternatively, the photon can also be emitted by the electron, leading to a decrease in the electron's energy level to 5 (10 - 5), which is a lower energy level than the original level. Consequently, the electron will not jump to a new energy level and will likely emit the photon soon after, returning to its initial energy level of 10. This process is known as an emission process.

The specific process that occurs will depend on various factors such as the energy and direction of the photon, and the energy levels and positions of the electrons in the atom. However, in general, the atom will undergo a change in energy level due to the interaction with the photon.

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Answer: The one direction where energy as heat will be initially transferred between the blocks is from block D to block A.

Explanation:

A substance like metal box that has high temperature will have more kinetic energy between its molecules due to which there will be more number of collisions between them.

Hence, it is able to transfer its heat energy more  readily ac compared to a substance with low heat energy.

As a result, in the given diagram as temperature is increasing from block A to block B so heat energy will be transferred from block D to block A.

Thus, we can conclude that one direction where energy as heat will be initially transferred between the blocks is from block D to block A.

Answer:

Chemoreceptors in the carotid bodies and aortic arch are sensitive to modifications in arterial carbon dioxide, oxygen, and pH. The carotid our bodies are generally extra important in mediating this response and supply the primary mechanism by using which mammals sense lowered levels of oxygen.

The sensory receptors are sensitive to changes in O₂ levels in the blood, located in carotid bodies.

An internal or external physical stimulation can cause a sensory receptor, a structure, to respond. It is a sensory nerve terminal that processes information after receiving it and sends nerve impulses to the brain for interpretation and perception.

Sensory neurons, central interneurons, and motor neurons make up a basic reflex arc. Receptors are used to sense the corresponding stimuli, and sensory neurons from receptors send this information to the spinal cord.

Motor neurons receive the signal after the spinal cord's interneurons have processed the incoming data. The spinal cord sends a signal to the effector organs, which are mostly muscles and glands, through the motor neuron.

Therefore, the sensory receptors, which are found in the carotid bodies, are sensitive to variations in blood oxygen levels.

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To make 500.0 mL of a 1.5M KNO3 solution, you would need 111.75 grams of KNO3.

To calculate the amount of KNO3 needed, we can use the formula:

Amount of KNO3 (in moles) = Molarity (in moles per liter) x Volume (in liters)

First, we convert the given volume from milliliters to liters:

500.0 mL = 500.0 mL / 1000 = 0.5 liters

Next, we can use the formula above to calculate the moles of KNO3 needed:

Amount of KNO3 (in moles) = 1.5 mol/L x 0.5 L = 0.75 moles

Finally, we can convert the moles of KNO3 to grams using its molar mass:

Molar mass of KNO3 = 39.10 g/mol (potassium) + 14.01 g/mol (nitrogen) + (3 x 16.00 g/mol) (oxygen) = 101.10 g/mol

Amount of KNO3 (in grams) = 0.75 moles x 101.10 g/mol = 75.825 grams

Rounding to the appropriate significant figures, the amount of KNO3 needed is approximately 111.75 grams.

To make 500.0 mL of a 1.5M KNO3 solution, you would need approximately 111.75 grams of KNO3.

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Answer:

3.3167 moles Of AlCl3

Explanation:

We'll begin by writing the balanced equation for the reaction. This is illustrated below:

3Ca + 2AlCl3 —> 3CaCl2 + 2Al

From the balanced equation above,

2 moles of AlCl3 reacted to produce 2 moles of Al.

Finally, we shall obtained the number of moles of AlCl3 that reacted to produce 3.3167 moles of Al as follow:

From the balanced equation above,

2 moles of AlCl3 reacted to produce 2 moles of Al.

Therefore, 3.3167 moles Of AlCl3 will also react to produce 3.3167 moles of Al.

Thus, 3.3167 moles Of AlCl3 is needed for the reaction.

The limiting reactant in this reaction is hydrogen gas.2 g of hydrogen  gas will produce about 254 of HI. Then, 13.4 g will produce 1702 g of HI.

A limiting reactant in a reaction is the reactant which is fewer in amount or consume early without complete reaction with other reactants. Hence, as soon as this reactant is consume, the reaction stops.

The given reaction of the formation of HI can be written as follows:

H₂ + I₂ → 2HI

Atomic mass of H= 1 g/mol

molecular mass of H₂ = 2g/mol

As per the balanced chemical equation of the reaction, one mole or 2 g of hydrogen gas produce 2 moles of hydrogen iodide.

molar mass of HI = 127 g/mol

mass of 2 moles = 127 × 2 = 254 g.

2 of hydrogen produces 254 g HI. Then , 13.4 g of H₂ produces :

(254 × 13.4) /2 = 1702 g of HI

Therefore, 13.4 g of H₂ produce 1702 g of HI.

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Assuming all orbitals are in the same energy level, the orbital with the lowest energy is the s orbital.

In the context of the electronic structure of atoms, orbitals are grouped into different energy levels, with each energy level containing one or more sublevels. The energy levels are labeled using the principal quantum number (n), with higher values of n corresponding to higher energy levels.

Within a given energy level, the s orbital is always the orbital with the lowest energy. This is because the s orbital has a spherical shape and is located at the center of the atom. It is shielded from the nuclear charge by the other electrons in the atom, resulting in a lower energy compared to other orbitals within the same energy level.

The p orbitals, on the other hand, have slightly higher energy than the s orbital within the same energy level. The p orbitals are dum bbell-shaped and are oriented along the x, y, and z axes. They have a higher energy due to their orientation and their closer proximity to the nucleus.

Similarly, the d and f orbitals, which exist in higher energy levels, have even higher energies compared to the s and p orbitals within their respective energy levels.

Therefore, if all the orbitals are in the same energy level, the s orbital will have the lowest energy among them.

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The compound that will readily react with the solution of bromine resulting from the mixture of hydrobromic acid and hydrogen peroxide is option (a) Cyclohexene.

A solution is a specific kind of homogenous mixture made up of two or more components that is used in chemistry. A solute is a substance that has been dissolved in a solvent, which is the other substance in the mixture.

Free bromine (Br2), a potent electrophilic and oxidizing agent, can be produced in situ by mixing hydrobromic acid (HBr) and hydrogen peroxide (H2O2). So, we must choose a substance that Br2 can easily react with in these circumstances.

Cyclohexene, one of the provided compounds, is an unsaturated double-bonded molecule that can go through electrophilic addition processes. With alkenes like cyclohexene, bromine easily engages in an electrophilic addition process to generate a dibromoalkane.

Hence, option (a) cyclohexene is the substance that will most rapidly react with the bromine solution produced by the mixture of hydrobromic acid and hydrogen peroxide.

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Plotting the graph of activity against time for a radioactive sample with an initial activity of 4.20 kBq and a half-life of 32 minutes, with measurements taken every 5 minutes for one hour, shows a decreasing exponential curve.

The activity of a radioactive sample decreases exponentially over time according to the formula A(t) = A0 * (1/2)^(t / T), where A(t) is the activity at time t, A0 is the initial activity, t is the time elapsed, and T is the half-life.

In this case, the initial activity A0 is 4.20 kBq and the half-life T is 32 minutes. Measurements are taken every 5 minutes for one hour, which corresponds to 12 measurements in total.

To plot the graph, we calculate the activity at each time point using the given formula and plot the points on a graph. The x-axis represents the time in minutes, and the y-axis represents the activity in kBq.

Starting with t = 0 minutes, the activity is 4.20 kBq. For each subsequent measurement at intervals of 5 minutes, we calculate the activity using the formula. The resulting data points can be plotted on a graph, connecting them with a decreasing exponential curve.

Note: Since the prompt doesn't specify the unit for time, we assume minutes for consistency with the half-life given in minutes.

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