How many oxygen atoms are there in the product: 6Ca+4PO4→2Ca3(PO4)2? A. 16 B. 2 C. 4 D. 8

We take in account the following formula tot determine the relative atomic mass:

Relative atomic mass = atomic mass of isotope (1) × abundance of isotope (1) +

atomic mass of isotope (2) × abundance of isotope (2) + ... and so on

For element Y we have:

Relative atomic mass of Y = 20 × 0.15 + 22 × 0.5 + 24 × 0.35 = 22.4

Answer:

C, 3g

Explanation:

4Fe + 3O2 = 3g

Since the number of atoms are same on the both sides of equation same amount of rust will be produced. Therefore 3g of Fe2O3 will be produced.

Answer:

the answer is 3 grams

The scientist is E. Thomson .

In the late nineteenth century, physicist J.J. Thomson started trying different things with cathode beam tubes. Cathode beam cylinders are fixed glass tubes from which the greater part of the air has been emptied. A high voltage is applied crosswise over two terminals toward one side of the cylinder, which makes a light emission stream from the cathode (the contrarily charged anode) to the anode (the emphatically charged cathode).

The cylinders are called cathode beam tubes on the grounds that the molecule bars or “cathode beam” begins at the cathode. The beam can be distinguished by painting a material known as phosphors onto the most distant finish of the cylinder past the anode. The phosphors sparkles, or produces light, when affected by the cathode beam.

Answer:

44.01 g/mol.

Explanation:

where, P is the pressure of the gas in atm (P = 35.0 kPa/101.325 = 0.345 atm).

V is the volume of the gas in L (V = 9.0 L).

n is the no. of moles of the gas in mol (n = ??? mol).

R  is the general gas constant (R = 0.0821 L.atm/mol.K),

T is the temperature of the gas in K (T = 32.0°C + 273 = 305.0 K).

∴ n = PV/RT = (0.345 atm)(9.0 L)/(0.0821 L.atm/mol.K)(305.0 K) = 0.124 mol.

∴ n = mass/molar mass

∴ mass = (n)(molar mass) = (0.124 mol)(44.01 g/mol) = 5.457 g.

Answer:

12560 J.

Explanation:

The amount of heat absorbed by water = Q = m.c.ΔT.

where, m is the mass of water (m = 1.5 kg = 1500.0 g).

c is the specific heat capacity of water = 4.186 J/g°C.

ΔT is the temperature difference = (final T - initial T = 27°C - 25°C = 2°C).

∴ The amount of heat absorbed by water = Q = m.c.ΔT = (1500.0 g)(4.186 J/g°C)(2°C) = 12560 J.

Answer:

The atomic mass is 14, which is the combined mass of protons and neutrons. The atomic number is the number of protons. SO if we have a total mass of 14 and we know 7 of that is protons, 14-7=7

the nitrogen has 7 neutrons

Answer:

The elections circle ITS B TRUST ME I JUST DID IT

Explanation:

Apex

The electrons circle the nucleus in specific orbits in Bohr's atomic atom.

Hence, Option (B) is correct answer.

According to the Bohr's Atomic model the electrons orbit the nucleus at fixed energy levels. This model was proposed by Neil Bohr in 1915.

The electrons which move around in predictable path is known as orbit.

Thus from the above conclusion we can say that The electrons circle the nucleus in specific orbits in Bohr's atomic atom.

Hence, Option (B) is correct answer.

Learn more about the Bohr's Atomic Model here: https://brainly.com/question/18002213

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Explanation:

At a given temperature, the pressure exerted by the vapors on its condensed phases in a closed system is known as vapor pressure.

Therefore, when an uncovered pot of water lies out in the sun then heat caused due to radiation of sun will heat the water. As a result, vapors start to form after a certain interval.

So, when heat inside the system increases then there will be increase in vapor pressure of the system.

Thus, we can conclude that the following statements correctly describe what happens at the surface of the liquid water:

Answer: it would be c. Protons are made of two Up and one Down quark. The neutron is made of two Down and one Up quark

Protons and neutrons are made up from quarks and in protons two up quarks & in neutron two down quarks are present.

Quarks are the fundamental or elementary particle of any matter present in the system, and quarks are combined together for the formation of a hadron.

Protons and neutrons are the examples of hadrons which are also made up of quarks.

Hence protons and neutrons are formed by the quarks.

To know more about quarks, visit the below link:

https://brainly.com/question/10253303

Answer:

0.21 M. (2 sig. fig.)

Explanation:

The molarity of a solution is the number of moles of the solute in each liter of the solution. The unit for molarity is M. One M equals to one mole per liter.

How many moles of NaOH in the original solution?

[tex]n = c \cdot V[/tex],

where

[tex]n = c\cdot V = 0.25\;\text{mol}\cdot\textbf{L}^{-1} \times 0.135\;\textbf{L} = 0.03375\;\text{mol}[/tex].

What's the concentration of the diluted solution?

[tex]\displaystyle c = \frac{n}{V}[/tex].

Concentration of the diluted solution:

[tex]\displaystyle c = \frac{n}{V} = \frac{0.03375\;\text{mol}}{0.160\;\textbf{L}} = 0.021\;\text{mol}\cdot\textbf{L}^{-1} = 0.021\;\text{M}[/tex].

The least significant number in the question comes with 2 sig. fig. Keep more sig. fig. than that in calculations but round the final result to 2 sig. fig. Hence the result: 0.021 M.

Answeri think 0.21 M

Explanation:

Answer:

Lewis concept

Explanation:

edg

Lewis concept  could be used to define SO[tex]_2[/tex] as a base. Inorganic chemical sulfur dioxide (SO[tex]_2[/tex]) is a heavy, colorless gas.

Inorganic chemical sulfur dioxide (SO2) is a heavy, colorless gas that is very toxic. It is created in enormous amounts during the transitional stages of the production of sulfuric acid. The stench of sulfur dioxide is as strong and unpleasant as that of a freshly struck match.

Sulfur dioxide, which naturally occurs as volcanic gases and also in solution inside the waters of certain warm springs, is often made industrially by burning sulfur or other sulfur-containing compounds like iron pyrite and copper pyrite in air or oxygen. Lewis concept  could be used to define SO[tex]_2[/tex] as a base.

Therefore, lewis concept  could be used to define SO[tex]_2[/tex] as a base.

To learn more about sulfur dioxide, here:

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Answer:

7.97 x 10⁻² mol.

Explanation:

where, P is the pressure of the gas in atm (P = 98.8 kPa = 0.975 atm).

V is the volume of the gas in L (V = 2.0 L).

n is the no. of moles of the gas in mol (??? mol).

R is the general gas constant (R = 0.0821 L.atm/mol.K).

T is the temperature of the gas in K (T = 25°C + 273 = 298 K).

∴ n = PV/RT = (0.975 atm)(2.0 L)/(0.0821 L.atm/mol.K)(298 K) = 7.97 x 10⁻² mol.

Answer: malleable

Explanation:

Chemical property is defined as the property of a substance which is observed during a reaction where the chemical composition identity of the substance gets changed.

Physical property is defined as the property which can be measured and whose value describes the state of physical system. For Example: State, density etc.

Malleable is a physical property as it is the ability to be beaten into sheets which means only shape changes.

Easy to digest is a chemical property as it requires oxidation of food.

Does not burn easily is a chemical property as it requires oxidation .

Becomes moldy quickly is a physical property as it requires oxidation .

Answer:

malleable

Explanation:

i did the test and got it correct

Final answer:

To find the final concentration of KI after adding 5 drops of 0.15 M KI to 40 drops of Na2S2O3, assuming each drop is equal in volume, the total volume is calculated and used to compute the final concentration, which is approximately 0.0167 M.

Explanation:

The question asks for the final concentration of KI (potassium iodide) after 5 drops of 0.15 M KI solution are added to 40 drops of Na₂S₂O₃ solution. To find the final concentration, we need to consider the total volume and the initial amount of KI. Assuming each drop has the same volume, the initial volume of KI solution is 5 drops and the final volume after mixing is 45 drops.

Initial moles of KI = Concentration × Volume = 0.15 M × 5 drops

Assuming 1 drop = 0.05 mL for calculation purposes, then 5 drops = 0.25 mL (converted to liters = 0.00025 L)

Initial moles of KI = 0.15 M × 0.00025 L = 0.0000375 mol

To find the concentration of KI in the final solution:

Final concentration = initial moles ÷ final volume = 0.0000375 mol ÷ (5 drops + 40 drops)

Assuming the volume per drop is constant, the final volume = 45 × 0.05 mL = 2.25 mL = 0.00225 L

Final concentration = 0.0000375 mol ÷ 0.00225 L = 0.0167 M

Therefore, the final concentration of KI in the mixture is approximately 0.0167 M.

Answer:

The second choice, or flammability.

Explanation:

The flammability of something is how easy it is for it to burn or ignite.

Answer:

The Answer in flammability

Explanation:

Both fire and the fire starter are chemicals therefore its B.

Answer:8.35

Explanation:first subtract 0.002 by 1.00 witch is 1.002 then divid by 12,00 witch is 8.35

Answer: covalent bond

Explanation: Tetracarbon Hexahyride is built using covalent bonds

Hope this helps please mark brainlist it would be greatly appreiciated :)

Answer:

Ba.

Explanation:

Atomic radius decreases across the period and increases across the group.

Atomic radius of Be = 153 pm.

Atomic radius of F = 147 pm.

Atomic radius of Ga = 187 pm.

Atomic radius of Ba = 268 pm.

∴ The element that has the largest atomic radius is Ba.

Answer:

Yes.

Explanation:

All of the heterozygous pairs are either really close or the same as the homozygous.

Carbon has 6 protons.

Hope that helped you!

I think the answers is D.12

a process where the scientists performing the research influence the results, in order to show a certain result

Answer:

Explanation:

An experimental bias can be define as the type of variable which is selectively chosen so as to obtain a desired result. It can also be said that a bias can be any kind of manipulation which is done by the experimenter so as to obtain a desired outcome or findings of the experiment.  An experimenter can also take the advantage of choosing the desired samples  from the collection of samples.

To avoid bias, a blinded study can be used in which the random variables as well as no bias while collecting the samples for study takes place.

Answer:

CuO with (1: 1) mole ratio.

Explanation:

Answer:

Gamma Rays are the most powerful kind of rays :p

Gamma rays are the most powerful type of solar radiation! If you need to know more on how harmful they are and what they can do let me know!

Answer:

D.) changes in the populations of the community

Explanation:

Any disruption of any ecosystem always leads to some changes, some minor ones, some dramatic ones. All of the organisms living in a particular ecosystem are adapted to live in the conditions that it provides, so when a change occurs it causes a big stress on the populations. Depending on the change that has occurred, it can cause changes in the populations, or it can even cause extinction to some populations.

Answer:

17,140 g = 17.14 kg.

Explanation:

Q = m.c.ΔT,

where, Q is the amount of heat absorbed by ice (Q = 3600 x 10³ J).

m is the mass of the ice (m = ??? g).

c is the specific heat of the ice (c of ice = 2.1 J/g.°C).

ΔT is the difference between the initial and final temperature (ΔT = final T - initial T = 100.0°C - 0.0°C = 100.0°C).

∵ Q = m.c.ΔT

∴ (3600 x 10³ J) = m.(2.1 J/g.°C).(100.0°C)

∴ m = (3600 x 10³ J)/(2.1 J/g.°C).(100.0°C) = 17,140 g = 17.14 kg.

Answer:

The reaction is exothermic.

Explanation:

When the temperature changes in a balanced system, it ceases to be in equilibrium because the value of the equilibrium constant is modified. Thus, at a temperature T1 the constant is K1, and at a temperature T2, the constant is K2. The relationship between these magnitudes is given in the so-called Van't Hoff equation.

The Wan't Hoff equation is:

[tex]\frac{lnK1}{lnK2}=-\frac{H}{R} (\frac{1}{T1}-\frac{1}{T2})[/tex]

Where:

ΔH: standard enthalpy of the reaction

R: constant of ideal gases

K1: equilibrium constant at temperature T1

K2: equilibrium constant at temperature T2

The Van't Hoff equation allows us to study how the chemical equilibrium shifts with temperature depending on whether we have an endothermic or exothermic reaction. So if the reaction is exothermic, ΔH <0, increasing the temperature decreases the equilibrium constant and the reaction moves to the left, while if the temperature decreases, the equilibrium constant increases and the equilibrium moves to the right.

Therefore, given the values ​​of the equilibrium constant at different temperatures and observing that it decreases when the temperature rises, the reaction is exothermic.

Answer:

Natural gas, emitting fewer harmful chemicals into the atmosphere than other fossil fuels, can help to mitigate some of these environmental issues. These issues include: Greenhouse Gas Emissions. Smog, Air Quality and Acid Rain

Explanation:

Final answer:

Coal combustion, part of the fossil fuels category, contributes the most to greenhouse gas emissions during energy production, particularly carbon dioxide (CO2). However, renewable energy alternatives like solar and wind power present viable solutions to reduce these emissions.

Explanation:

The energy source that contributes to the greatest emissions of gases in the environment during the energy production process is the burning of fossil fuels, notably coal, oil, and natural gas. This is primarily due to their capacity to release significant amounts of carbon dioxide (CO2) when combusted. Coal is the most carbon-intensive of these fuels, especially when used for electricity generation, leading to the highest CO2 emissions per unit of energy produced.

Coal combustion not only releases more greenhouse gas carbon dioxide per unit of energy output than any other energy-yielding process but also produces pollutants like fly ash and sulfur dioxide. However, innovations in renewable energy sources such as solar and wind power are emerging as viable alternatives to reduce reliance on fossil fuels and mitigate greenhouse gas emissions.

Given the significant environmental impact of burning fossil fuels, transitioning to renewable energy sources, enhancing energy efficiency, and investing in green technology research and development are critical steps toward combating climate change and reducing global greenhouse gas emissions.

Final answer:

MnO2 is a catalyst that increases the decomposition rate of H2O2 into H2O and O2 by lowering the reaction's activation energy and is not consumed in the process.

Explanation:

MnO2, manganese dioxide, serves as a catalyst in the decomposition of H2O2 into H2O and O2. A catalyst is a substance that increases the rate of a chemical reaction by lowering the activation energy needed for the reaction to proceed, without being consumed in the process. After the reaction, the catalyst returns to its initial state and can be used repeatedly. Therefore, the correct answer to the question concerning the role of MnO2 is (d) a catalyst.

D. Red and Violet are reflected, Green is absorbed

Leaves of plants are green because chlorophyll pigments absorb red and blue light and reflect green light. The correct answer is B - red and blue are absorbed, and green is reflected.

The color absorbed and reflected by the leaves of most plants can be understood by examining the pigments chlorophyll a and chlorophyll b, which absorb light for photosynthesis. Chlorophyll a absorbs light primarily in the blue-violet and red regions, and chlorophyll b absorbs red-blue light. Both pigments reflect green light, which is why leaves appear green to us. Addition to this, there are carotenoids that absorb light in the blue-green and violet region and reflect longer yellow, red, and orange wavelengths.

The correct answer to the question is B. Red and blue are absorbed; green is reflected. This is because chlorophyll a and b absorb light at blue and red wavelengths, which are essential for photosynthesis, and reflect the green wavelengths that they do not absorb.

Answer:

Independent: The types of fertilizer. (Independent I Change)

Dependent: The plants height. (Dependent is Dependent on the Independent)

Control: The Type of plants (What isn't being changed throughout the experiment.)