Answer:
2Fe+3H20=Fe203+3H2
Explanation:
How to keep chocolate covered strawberries from sweating?.
Answer: by putting them in the freezer
Explanation:
The burning of magnesium is a highly exothermic reaction. How many kilojoules of heat are released when 0. 75 mol of Mg burn in an excess of O2?
2Mg(s) + O2(g) → 2MgO(s) + 1204 kJ
Taking into account the definition of enthalpy of a chemical reaction, the quantity of heat released when 0.75 moles of Mg are burned is 451.5 kJ.
Enthalpy of a chemical reactionThe enthalpy of a chemical reaction is known as the heat absorbed or released in a chemical reaction when it occurs at constant pressure. That is, the heat of reaction is the energy that is released or absorbed when chemicals are transformed into a chemical reaction.
The enthalpy is an extensive property, that is, it depends on the amount of matter present.
Heat released in this caseIn this case, the balanced reaction is:
2 Mg(s) + O₂ (g) → 2 MgO(s) + 1204 kJ
This equation indicates that when 2 moles of Mg reacts with 1 mole of O₂, 1204 kJ of heat is released.
When 0.75 moles of Mg are burned, then you can apply the following rule of three: if 2 moles of Mg releases 1204 kJ of heat, 0.75 moles of Mg releases how much heat?
[tex]heat=\frac{0.75 moles of Mgx1204 kJ}{2 moles of Mg}[/tex]
heat= 451.5 kJ
Finally, the quantity of heat released when 0.75 moles of Mg are burned is 451.5 kJ.
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A welding torch produces a flame by burning acetylene fuel in the presence of oxygen. the energy released from the acetylene fuel is then used to melt a metal. which energy transformation happens during this process? chemical energy turns into thermal energy. kinetic energy turns into potential energy. thermal energy turns into electromagnetic energy. potential energy turns into chemical energy.
A welding torch produces a flame by burning of acetylene fuel then energy released from the acetylene fuel is then used to melt a metal, so transformation of chemical energy into thermal energy takes place.
What is transfer of energy?Energy neither can be produced nor destroyed but it only transfers from one form to other form.
In the question it is given that, burning of acetylene produces energy and this produced energy is a type of chemical energy and then this is used as a thermal energy for the melting of metal.
So conversion of kinetic energy to potential energy, thermal energy to electromagnetic energy and potential energy to chemical is wrong.
Hence transformation of chemical energy into thermal energy takes place.
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Answer:
A welding torch produces a flame by burning of acetylene fuel then energy released from the acetylene fuel is then used to melt a metal, so transformation of chemical energy into thermal energy takes place.
What is transfer of energy?
Energy neither can be produced nor destroyed but it only transfers from one form to other form.
In the question it is given that, burning of acetylene produces energy and this produced energy is a type of chemical energy and then this is used as a thermal energy for the melting of metal.
So conversion of kinetic energy to potential energy, thermal energy to electromagnetic energy and potential energy to chemical is wrong.
ANSWER IS (D)
Explanation:
When calcium carbonate is heated, it breaks down into calcium oxide and carbon dioxide.
CaCO3(s) →CaO(s) + CO2(g)
You heat 2.0 moles CaCO3.
How many moles of carbon dioxide(CO2) will you make?
A) 4 moles CO2
B) 2 moles CO2
C) 1 mole CO2
D) 0.50 moles CO2
The radioactive element francium undergoes a series of nuclear decays, eventually forming a stable isotope of lead. One part of the process involves
francium-221 undergoing two alpha decays, followed by a beta decay.
The element formed after this portion of the decay series is
213,84Po. This is further explained below.
What is the element formed after this portion of the decay series?Generally, when the radioactive element francium undergoes a series of nuclear decays the sum of the mass number, the atomic number, and decay particles are equal.
In conclusion, francium-221 decays to to its first beta decay to give 213,84Po
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CQ
The radioactive element francium undergoes a series of nuclear decays, eventually forming a stable isotope of lead. One part of the process involves francium-221 undergoing two alpha decays, followed by a beta decay. What is the element formed after this portion of the decay series? (In the box below, type in the symbol using the isotope tool. An example for carbon-12 is provided.)
Explain the various factors that impact the solubility of substances in water.
Answer:
There are two direct factors that affect solubility: temperature and pressure.
Explanation:
Temperature affects the solubility of both solids and gases.
Pressure only affects the solubility of gases
If the pressure is low enough, the boiling point and the melting point of water can be equal. What is this point called? Do you think this point can exist for substances other than water? Explain your reasoning.
Answer:
This is called "evaporation" when a liquid is boiling hot, it starts to evaporate. That is how clouds form! Every liquid is able to evaporate because when it's heated up, it turns into gas. That gas is vapor.
Explanation:
common sense
What behavioral adaptation helps zebras protect themselves against predators?
a group of zebras in a plain
Having a tail
Having thick fur
Looking like each other
Traveling in herds
Behavioral changes of individuals of a species that allow for better survival. (Acquired traits)
Incorrect Chlorophyll?
Natural selection is the process that selects the organism that can survive and reproduce in an altered environment. These behavioral changes are adapted.
What is adaptation?Adaptation is the part of natural selection and a trait that allows the improved organism to survive and reproduce in environmental conditions.
The adapted organism can survive and reproduce in the changed environmental conditions by the process of natural selection.
Therefore, adaptation allows for better survival through behavioral changes in individuals.
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A mixture of two gases with a total pressure of 8.00 atm contains 0.60 atm of Gas A. What is the partial pressure of Gas B
Answer:
Pt = Total pressure, Pa = Gas A and Pb = Gas B
Pt = Pa + Pb
Pt - Pa = Pb
Explanation:
Pb = Pt - Pa
Pb = 8.00 atm - 0.60 atm
Pb = 7.4 atm
The total pressure of a gaseous mixture is the sum of pressure of its component gases. Thus the partial pressure of gas B in the mixture of total pressure 8 atm containing 0.60 atm A is 7.4 atm.
What is partial pressure ?Partial pressure of a component gas in a mixture of gases is the contribution of that gas to the overall pressure or total pressure of the mixture.
Let the a mixture contains n number of gases and each with a pressure of P1, P2 etc.Then the total pressure be written as follows:
[tex]\rm P_{total} = \sum P_{i} = \sum P_{1} + P_{2}+ P_{3} .....[/tex]
Here the mixture containing gas A and B with partial pressure Pa and Pb. The total pressure of the gas is given 8 atm and Pa is given 0.60 atm . Thus,
[tex]\rm P_{total} = P_{a} + P_{b}[/tex]
8 atm = 0.60 + Pb
Pb = 8 - 0.6 = 7.4 atm.
Hence, the partial pressure of gas B os 7.4 atm.
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How much energy is given off by the following reaction, if 162.5 g of oxygen reacts with excess ammonia (NH3)? 4 NH3 + 5 O2 + 4 NO + 6 H2O AH = -1225.6 kJ
From the enthalpy values, 1244.8 kJ of heat is given off when 162.5 g of oxygen reacts with excess ammonia.
What is the amount of heat given off in a reaction?The amount of heat given off in a reaction is known as enthalpy change.
Heat is given off in an exothermic reaction.
From the enthalpy value of the given reaction, 1225
6 kJ of heat is given off when 5×32 g or 160 g of oxygen reacts with ammonia.
Amount of heat given off when 162.5 g of oxygen reacts with excess ammonia is;
Heat given off = 1225.6 kJ × 162.5/160 = 1244.8 kJ
Therefore, 1244.8 kJ of heat is given off when 162.5 g of oxygen reacts with excess ammonia.
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Determine the volume of 0.107 M NaOH required to reach halfway to the stoichiometric point of the titration.
Answer:
Need more information to solve! What is the analyte? Its concentration?
Explanation:
Which ion was formed by providing the second ionization energy to remove an electron? ca2 n3– fe3 s2–
Ca²⁺
________________
ca2! Have a nice day!
Which best represents the reaction of calcium and zinc carbonate (znco3) to form calcium carbonate (caco3) and zinc? ca → znco3 caco3 → zn ca znco3 → caco3 zn caco3 zn → ca znco3 caco3 zn ca → znco3
The equation which best describes the reaction of calcium and zinc carbonate to form calcium carbonate and zinc is Ca+ZnCO₃→CaCO₃+Zn.
What is chemical reactions?Chemical reactions are those reactions in which one or more reactants combine with each other for the formation of new product.
In the question it is mention that calcium reacts with zinc carbonate for the formation of calcium carbonate and zinc in the following manner:
Ca + ZnCO₃ → CaCO₃ + Zn
All reactions rather than the above reaction is incorerct as in that proper combination of molecules are not given.
Hence required chemical reaction is Ca + ZnCO₃ → CaCO₃ + Zn.
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Answer:
to keep it short it’s B;)
Explanation:
Predict which one of the following halogen has the lowest electronegativity?
A. Iodine ⃝ B. Bromine ⃝
C. Chlorine ⃝ D. Fluorine ⃝
Answer:
A. lodine
Explanation:
In moving down to the halogen group E.N. decreases hence Iodine has lowest electronegativity.
Answer:
A. Iodine
Electronegativity decreases down the group as the size of the atom increases .
How many Hydrogen moles needed to get the energy to equal 1 mol of gasoline?
Answer:
1 grams Hydrogen is equal to 0.992122546977 mole.
Explanation:
Hydrogen is equal to 0.992122546977 mole.
Practice: Isotope Calculations #2 worksheet
Iotopes of elements are atoms of the same element which differ in their mass numbers due to differences in neutron number in the nucleus.
What are isotopes?Isotopes are atoms of an element which have the same atomic number but different mass numbers.
The difference in mass number is due to difference in number of neutrons in the nucleus of the atom.
The data of the given isotopes of elements are as follows:
[tex]^{24}Na, Na-24, 11, 24, 11, 12, 11[/tex]
[tex]^{32}O, O-32, 16, 32, 16, 16, 16[/tex]
[tex]^{44}Ca, Ca-44, 20, 44, 20, 24, 20[/tex]
[tex]^{24}Mg, Mg-24, 12, 24, 12, 12, 12[/tex]
[tex]^{64}Zn, Zn-64, 30, 64, 30, 34, 30[/tex]
[tex]^{207}Pb, Pb-207, 82, 207, 82, 125, 82[/tex]
[tex]^{238}U, U-238, 92, 238, 92, 146, 92[/tex]
[tex]^{129}Te, Te-129, 52, 129, 52, 77, 52[/tex]
[tex]^{19}F, F-19, 9, 19, 9, 10, 9[/tex]
Therefore, isotopes of elements differ in their mass numbers.
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Answer:
2,4, 7, Ng, N, P 6,9
Explanation:
NEED HELP PLSS:(
Values for the molar mass of nitrogen, oxygen, and nitrogen dioxide
molecules are given in the table below. What mass of nitrogen dioxide
molecules is formed when 1 mole of nitrogen reacts with 2 moles of oxygen
and forms nitrogen dioxide?
Molecule
Molar mass (g/mol)
N2
32 .00
NO2
46.01
O A. 92.02 g
O B. 23.00 g
O C. 2.00 g
O D. 46.01 g
Answer:
A: 92.02 g
Explanation:
Equation of the reaction;
N2 (g)+ 2O2(g)------> 2NO2(g)
Note that the balanced reaction equation is the first step in solving any problem on stoichiometry. Once the reaction equation is correct, the question can be easily solved...
What is the residue when the reaction mixture is filtered
Answer:
Filtration can be used to separate an insoluble solid from a liquid, or a precipitate from the reaction mixture in which it formed. The solid which collects in the filter paper is called the residue. The clear liquid which passes through the filter paper is called the filtrate.
Explanation:
i had this question before
What are the components of one formula unit of caf2.
Answer:
A calcium fluoride ([tex]{\rm CaF_{2}[/tex]) formula unit includes one calcium ion and two fluoride ions.
Explanation:
The content of one formula unit of an ionic compound is exactly the same as what its empirical formula would suggest. (The empirical formula shows the atoms that form this compound, in the smallest whole number ratio.)
For example, [tex]{\rm CaF_{2}}[/tex] is the empirical formula of the ionic compound calcium fluoride. One formula unit of this compound would thus include:
a calcium atom, and two fluoride ions.However, since [tex]{\rm CaF_{2}}\![/tex] is an ionic compound, all these atoms would take the form of ions:
[tex]{\rm Ca^{2+}}[/tex] (calcium ion) for calcium, and [tex]{\rm F^{-}}[/tex] (fluoride ion) for fluorine.Thus, one formula unit of [tex]{\rm CaF_{2}}[/tex] would include [tex]1[/tex] calcium ion and [tex]2[/tex] fluoride ions.
Why does benzocaine precipitate during neutralization?.
Explain why benzocaine precipitates during the neutralization.
With the addition of an acid, the amine group on the benzocaine will become protonated. The protonation creates a positive charge on the benzocaine molecule. Because of this, benzocaine will become soluble in a polar solvent. However, when the solution is returned to a more basic pH level, the amine will no longer be protonated. Thus, the benzocaine will no longer be soluble and will precipitate during neutralization.
Studies have found that lab coats are typically washed every 1 to 2 weeks. These lab coats often contain harmful germs that can be transmitted to patients during routine examinations. If this happens, the infection would be considered
congenital.
iatrogenic.
morbid.
nosocomial.
asymptomatic.
zoonotic.
Answer:
The answer is nosocomical.
Explanation:
It was transmitted from a hospitial.
What enzyme performs an isomerization reaction carried out by dehydration and hydration steps and contains a 4Fe-4S cluster that is involved in substrate binding
Aconitate hydratase is the enzyme which performs an isomerization reaction carried out by dehydration and hydration steps.
What is an Enzyme?These are proteins which serves as biological catalyst thereby accelerating the rate of chemical reaction.
This enzyme catalyses the stereo-specific isomerization of citrate to isocitrate and contains a 4Fe-4S cluster that is involved in substrate binding.
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How are polypeptides and proteins similar?
Answer:
C.
Explanation:
a
a
4. Suppose the temperature inside a sealed container increases. How do you
expect this change to affect the partial pressure of each gas in a mixture of
gases inside the container? How does it affect the total pressure?
Answer:
The volume of the system will change and maybe the shape of the system boundary
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16:31:41
What is the name of the hydrocarbon CH3(CH2)6CH3?
butane
decane
octane
propane
Answer:
octane is the answer have a good day
which word indicates that the energy in a system is negive
Answer:
Exergonic or Exothermic (see explanation)
Explanation:
If you're talking about heat energy specifically, then the term is exothermic, meaning that the system loses heat. If referring to overall energy of a system, the term is exergonic, meaning that the system does work on the surroundings and is thus losing energy.
25 Points! A flashlight uses the chemical energy stored in a battery. This chemical energy is eventually converted into which two forms of energy?
A.) Mechanical and nuclear
B.) Radiant and thermal
C.) Thermal and mechanical
D.) Nuclear and electrical
Answer:A.) Mechanical and nuclear
Explanation:
iv,e got nuthing sorry im only a kid i have to leared that yet
answer:
B) Radiant and Thermal
explanation:
"In a flashlight, chemical energy in the batteries is converted to electrical energy when the circuit including the batteries, switch and light bulb is completed. The electrical energy is converted to light (electromagnetic / radiant energy) and some heat (thermal energy) by the light bulb." -https://www.crosbyisd.org/cms/lib6/TX02216626/Centricity/Domain/392/6_9C-EnergyFormsConversions.pdf
Which geometry or geometries are common for complexes with a coordination number of 6?.
Answer: Heyo Kenji Here! Here's your answer- Octahedral complexes have a coordination number of six, and the six donor atoms are arranged at the corners of an octahedron around the central metal ion.
Explanation: Hope this helps!
Have a nice day!
- Kenji ^^
When is the small size of gas particles taken into account?
No bots!
Answer:
At high pressures and low temperatures.
Explanation:
That's when the volume of the gas is quite small.
The volume of the gas particles can then be a significant proportion of the total volume.
Answer:
At high pressure and low temperature.
Explanation:
Remember how ideal gases behave under high temperatures and low pressure.
So the opposite would be when gas particles are taken into account.