Write balanced equations for each of the following by inserting the correct coefficients in the blanks:
(b) __Ca₃(PO₄)₂(s)+ ___SiO₂(s)+ __C(s) →
__P₄(g) + __CaSiO₃(l) 1 __CO(g)

Answer:

The energy required to completely separate the molecules, moving from liquid to gas, is much greater that if you were just to reduce their separation, solid to liquid. Hence the reason why the latent heat of vaporization is greater that the latent heat of fusion.

Answer:

It takes longer to boil water than to melt ice because of the difference in the amount of heat required to overcome the forces of attraction by keeping the temperature constant during this time. ... This is the reason it takes longer in boiling than in melting.

Answer:

Radiation

Conduction

Convection

Explanation:

Radiation: Transfer of heat by electromagnetic rays (Example: A microwave heating food)

Conduction: Transfer of heat energy from one object to another through direct contact (Example: Getting out of bed and your warm feet touch cold tile, making the tile warm and your feet cold)

Convection: Movement of heat by a fluid such as air or water (Example: A convectional oven works by heating the air inside the oven to evenly cook food)

Hope this helps!

The mass of the compound that we have is 365.54 grams. Option B

The mole (mol) is the SI unit for measuring the amount of a substance in chemistry.

The mole is used to convert between mass, moles, and number of entities, allowing chemists to work with the macroscopic amounts of substances they need to, while still having a convenient way of expressing their composition at the molecular level.

Now we know that;

Molar mass of KCl = 75 g/mol

Mass of the compound = 4.9 moles  * 74.5 g/mol

= 365.54 grams

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Answer:

0.075 kg

750 dg

7.5 dag

Explanation:

1 kg = 1000 g

So, 0.075 kg = (0.075 × 1000)g = 75 g

1 dg = 0.1 g

So, 750 dg = (750 × 0.1) g = 75 g

1 dag = 10 g

So, 7.5 dag = (7.5 × 10) g = 75 g

The bonding is nature's way of lowering the energy of the system to attain stability. The covalent bonds involve the sharing of electrons between atoms; ionic bonds involve the transfer of electrons from one atom to another. The correct option is A.

The attractive force that holds the constituent atoms or ions of a molecular species together is called the bond. An ionic bond is formed by the complete transfer of electrons from one atom to another. This transfer results in the formation of positive and negative ions.

In the formation of a covalent bond, there occurs a sharing of an electron pair between two atoms.

Thus the correct option is A.

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Sampling is the process of choosing the group from from which you'll actually collect data for your study.

Chemistry undergraduate research is independent experimentation carried out under the direction and supervision of something like a mentor or adviser. In an ongoing study project, students look at topics that interest them and their adviser. The chemical sciences cover a wide range of subject areas.

Modern chemistry research may be divided into two categories: pure and applied. Pure chemistry researchers work primarily to improve human knowledge of chemistry. Greater comprehension of the ideas behind how matter changes during chemical reactions is what pure chemistry is all about.

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The energy change for the reaction (per formula unit of CsBr) is approximately -6.22 x 10^14 kJ.

Ionization Energy (I1) of Cs: 0.624 aJ

Electron Affinity (EA1) of Br: -0.540 aJ

Cation (Cs+) Ionic Radius: 167 pm

Anion (Br-) Ionic Radius: 196 pm

1. Calculate the lattice energy using Coulomb's law:

Lattice energy = (k * |Q1 * Q2|) / r

Where k is the electrostatic constant (8.99 x 10^9 N·m^2/C^2), Q1 and Q2 are the charges of the ions, and r is the distance between the ions.

Q1 = +1 (charge of Cs+)

Q2 = -1 (charge of Br-)

r = sum of the ionic radii = 167 pm + 196 pm = 363 pm = 3.63 x 10^-10 m

Lattice energy = (8.99 x 10^9 N·m^2/C^2) * |(1.602 x 10^-19 C * 1) * (1.602 x 10^-19 C * -1)| / (3.63 x 10^-10 m)

Lattice energy = (8.99 x 10^9 N·m^2/C^2) * (2.571 x 10^-38 C^2) / (3.63 x 10^-10 m)

Lattice energy ≈ 6.34 x 10^-19 J

2. Convert the energy change to kilojoules:

Energy change = (0.624 aJ + (-0.540 aJ) - 6.34 x 10^-19 J) * (1 x 10^-3 kJ / 1 J)

Energy change ≈ (0.624 - 0.540 - 6.34 x 10^-19) x 10^-3 kJ

                         ≈ -6.22 x 10^14 kJ.

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Electrophillic addition occurs when the substrate has a double bond and the attacking agent is a electrophile.

The term electrophillic addition refers to a type of addition that occurs when the substrate has a double bond and the attacking agent is a electrophile.

The mechanism of the electrophillic attack on methyl propene as shown indicates that the attacking agent is an electrophile(Br^+).

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Answer: A The Triangle Fire was a tragedy that could have been prevented.

Explanation:

The Triangle Fire was a tragedy that happened in the factory of Shirtwaist Company in New York City where there was.a.fore outbreak and about 145 employees of the company were killed.

The deaths could have been prevented because the company neglected safety measures such as having a good and reliable pump system, having readily available fire extinguishers. Also, what resulted in the lethal nature of the incident was because the doors within the building of the factory were locked.

The tragedy generated lots of attention and series of laws were been out in place in order to ensure that workers are safe at their workplace.

Answer:

The answer is C. Plasma

Answer:

metric........................................ system..................................

Answer:

Solar technologies convert sunlight into electrical energy either through photovoltaic (PV) panels or through mirrors that concentrate solar radiation. This energy can be used to generate electricity or be stored in batteries or thermal storage.

Explanation:

Answer:

2

Explanation:

good vibes

Answer:

You will need to have a red flower in the top left, a pink flower in the top right and bottom left, and a white flower in the bottom right.

Explanation:

This flower appears to express color through codominance, which means that both genes express themselves. "R" is the dominant gene for red, and "r" is the recessive gene for white. When a flower has RR genotype, the phenotype will be a red flower. When a flower has an Rr genotype, the red and white genes will both be expressed and the phenotype will be pink. When a flower has an rr genotype, it lacks the red gene and will therefore be only white.

Answer:

how can I solve this ?4Al+3O2 produce 2Al2O3 find a) oxygen atoms needed to react with 5.4 g of aluminium b) grams of oxygen needed to react with 0.6 mol of aluminium?

(A) n=m/M,

n(Al)=5.4/27=0.2 moles

n(O2)=n(Al)*3/4=0.2*3/4=0.15 moles

Number of oxygen atoms= n(O2)*Avogadro's number

=0.15*6.02*10^23=9.03*10^22 oxgyen atoms

(B)

n=m/M

n(Al)=0.6/27=0.02222 moles

n(O2)=n(Al)*3/4=0.016666 moles

m=n*M

m(O2)=0.0166666*32=0.53333 grams

The drying agent will stick to the sides of the container is the visual indicator that enough of a drying agent, such as anhydrous \(\rm MgSO_4\) or \(\rm CaCl_2\), has been added to properly dry an organic solution.

Water can interfere with a variety of organic reactions and change the properties of organic solvents, thus drying agents are used to get rid of it. The fact that anhydrous \(\rm MgSO_4\)and \(\rm CaCl_2\) have a significant affinity for water and may efficiently remove water molecules from the organic solution makes them popular drying agents.

The drying agent will initially interact with any water in the organic solution and generate hydrated salts when it is introduced. The solution may contain clumps or tiny particles of these hydrated salts, giving the impression that it is murky or hazy. However, the cloudiness should progressively go away as the drying agent keeps drying the solution by reacting with the water.

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When a substance called hydrogen sulfide (H₂S) is exposed to flames, it can break down and form a poisonous gas.

Hydrogen sulfide (H₂S) is a colorless, flammable gas with a distinct odor of rotten eggs. When H₂S comes into contact with flames, it can undergo a chemical reaction known as combustion. Combustion is a process in which a substance reacts with oxygen to produce heat, light, and often new chemical compounds.

In the presence of flames, hydrogen sulfide (H₂S) can react with oxygen (O₂) from the air. The reaction results in the formation of sulfur dioxide (SO₂) and water (H₂O). Sulfur dioxide is a poisonous gas that can cause respiratory issues and other health problems when inhaled.

The reaction can be represented by the following equation:

2H₂S + 3O₂ → 2SO₂ + 2H₂O

It's important to note that the combustion of hydrogen sulfide should be avoided, as it can release toxic gases into the environment and pose a risk to human health.

Therefore, Exposure of hydrogen sulfide (H₂S) to flames can result in its decomposition and the production of a toxic gas.

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False. Both saturated and unsaturated fatty acids can be found in food.

For instance, sources of both saturated and unsaturated fatty acids include foods derived from animals, such as meat and dairy.

Parallel to this, both kinds of fatty acids are present in vegetable oils like olive oil and canola oil.

Most fats and oils have varying amounts of saturated and unsaturated fats.

You should aim to reduce your intake of foods and beverages that are high in saturated and trans fats and replace some of them with unsaturated fats as part of a balanced diet.

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Answer:

c .

Explanation:

Answer:

c

Explanation:

Answer:

Lead phosphate

Explanation:

Pb3(po4)2 has the compounded name of lead(II) phosphate.

It is a white, crystalline solid that is insoluble in water. Lead(II) phosphate is used in some paints and plastics, and it is also used as a pigment.

The name of the compound is based on the oxidation state of the lead atom. Lead can have two oxidation states, +2 and +4. In Pb3(PO4)2, the lead atom has an oxidation state of +2, so the compound is named lead(II) phosphate.

The phosphate ion has an oxidation state of -3, so there are two phosphate ions in the compound to balance the +6 charge of the three lead atoms.

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The required volume flow rate of liquid ethyl alcohol to supply at a rate of 2000 kJ/s is approximately 164.9 L/min.

To determine the required volume flow rate of liquid ethyl alcohol, we need to calculate the fuel flow rate first. Then, we can convert it to volume flow rate.

Given:

Rate of energy release (Q) = 2000 kJ/s

Excess air = 40% (or 0.4)

First, let's calculate the fuel flow rate (m f):

Q = m f × Lower Heating Value (LHV)

The Lower Heating Value (LHV) for ethyl alcohol can be calculated using the enthalpy of vaporization:

LHV = enthalpy of vaporization / molecular weight of fuel

LHV = 42,340 kJ/k mol / 46.07 kg/k mol = 920.11 kJ/kg

Now, we can calculate the fuel flow rate:

m f = Q / LHV

m f = 2000 kJ/s / 920.11 kJ/kg ≈ 2.173 kg/s

Next, let's convert the fuel flow rate to volume flow rate:

Volume flow rate (V f) = m f / density

V f = 2.173 kg/s / 790 kg/m³ = 0.002749 m³/s

Finally, we can convert the volume flow rate to L/min:

V f = 0.002749 m³/s × (1000 L/1 m³) × (60 s/1 min) ≈ 164.9 L/min

Therefore, the required volume flow rate of liquid ethyl alcohol to supply at a rate of 2000 kJ/s is approximately 164.9 L/min.

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Since 1:1:3 is the smallest ratio that can be used to balance the chemical equation using whole number coefficients, you can thus say that the oxygen molecule has a coefficient of 3 in the balanced chemical equation that describes the decomposition of magnesium chlorate.

Answer:

\(The \: metric \: system \: uses \: one \: unit \: for \: each \: \\ category \: of \: measurement. \)

Concentration refers to the amount of solute present in a given volume of solvent. The concentration of a gas, on the other hand, can be measured in terms of the number of molecules in a particular volume of air. The concentration of CO2 in air is therefore 0.002%.

In order to calculate the concentration of CO2 in air, you would need to know the total number of molecules present and the number of CO2 molecules present. If there are 0.002 molecules of CO2 per 100 molecules of air, the concentration of CO2 in air can be expressed as 0.002%. This means that for every 100 molecules of air, there are two molecules of CO2 present. Concentration refers to the amount of solute present in a given volume of solvent. The concentration of a gas, on the other hand, can be measured in terms of the number of molecules in a particular volume of air. In order to calculate the concentration of CO2 in air, you would need to know the total number of molecules present and the number of CO2 molecules present. To calculate the concentration, you would use the following formula:
Concentration = (Number of CO2 molecules / Total number of molecules) x 100%
In this case, the number of CO2 molecules is 0.002 and the total number of molecules is 100. Therefore, the concentration of CO2 can be calculated as:
Concentration = (0.002 / 100) x 100% = 0.002%
This means that for every 100 molecules of air, there are two molecules of CO2 present. The concentration of CO2 in air is therefore 0.002%.

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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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The substance would begin to boil when its temperature reaches its boiling point.

The boiling point of a substance is the temperature at which its vapor pressure equals the atmospheric pressure, and boiling occurs when the vapor pressure exceeds the atmospheric pressure. At normal standard pressure, which is one atmosphere, the boiling point of water, for example, is 100°C.

So, if the substance in question is water, it would begin to boil at 100°C. However, if it is a different substance, its boiling point may be higher or lower than 100°C, and it would begin to boil when its temperature reaches its specific boiling point.

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Chemicals released by a neuron onto a target with an excitatory or inhibitory effect are called neurotransmitters. Therefore, the correct answer is option C: neurotransmitters.

Neurotransmitters are chemical messengers that transmit signals between neurons and their target cells, which can be other neurons, muscle cells, or gland cells. They are synthesized and stored within the neuron's synaptic vesicles. When an action potential reaches the presynaptic neuron's terminal, it triggers the release of neurotransmitters into the synapse, the small gap between the presynaptic neuron and the postsynaptic target cell.

Neurotransmitters can have excitatory or inhibitory effects on the postsynaptic cell. Excitatory neurotransmitters promote the generation of an action potential in the postsynaptic cell, while inhibitory neurotransmitters decrease the likelihood of an action potential being generated. This excitatory or inhibitory effect is determined by the specific receptors on the postsynaptic cell that bind to the neurotransmitters.

Examples of neurotransmitters include acetylcholine, dopamine, serotonin, gamma-aminobutyric acid (GABA), and glutamate. They play crucial roles in regulating various physiological and cognitive processes, including mood, memory, muscle contraction, and pain sensation.

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The molecular formula of the compound which has a molecular weight of 112.124 atomic mass units is C₆H₈O₂.

Molecular formula of any compound tells about the composition and numbers of each entities present in that molecule.

Steps involved in the prediction of molecular formula:

      Molar mass of C₃H₄O = 3(12) + 4(1) + 16 = 56

        112.124/56 = 2

        Molecular formula = (C₃H₄O)₂ = C₆H₈O₂

Hence correct option is (E).

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Answer:250 grams

Explanation:  Density x Volume = Mass

(10.00 g/mL)*(25.00 mL) = 250 grams