4. Magnesium and oxygen undergo a chemical reaction to
produce magnesium oxide.
2Mg + O2 + 2MgO
If 24.4 grams of magnesium react with oxygen gas to produce
40.5 grams of magnesium oxide, what is the mass in grams of
the oxygen gas in the chemical change?

Answer:

Which term best describes this reaction?

         CH₃  H         ┌ CH₃   H ┐

           │     │         │  │       │  │

       n C ═ C  ➝    ├ C ── C ┤

          │      │         │  │       │  │

          H     H         └  H      H ┘

❌ A) condensation polymerization

❌ C) hydrohalogenation

❌ D) hydration

I Took Question Test And Have Nice Day.

Answer:

The best answer out of the 4 Would be A. Addition

Explanation:

I took the Test.

From the enthalpy values, 1244.8 kJ of heat is given off when 162.5 g of oxygen reacts with excess ammonia.

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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Answer: by putting them in the freezer

Explanation:

Answer:

I would write "terrestrial/lives on land during all life stages" between the frog and pigeon branches

Explanation:

Jaw evolution has started with fish, so i'd place that before the perch, evolution of four limbs is next and I would plate it between the perch and the frog. Evolution of an egg has ensured that organisms remain terrestrial during all stages of life and don't need to rely on water to lay their eggs. So I would place that between the frog and the pigeon. True mammary glands and true hair, as we know it formed on mammals so i'd place that between the pigeon and the rats (although synapsids evolved similar structures long before birds even existed). And lastly, I would place "walking on two legs" between rats and human branches. Because our ancestors evolved bipedalism relatively late.

 Ca²⁺

________________

ca2! Have a nice day!

Answer:

Your answer would be:
B.) 1.0 × 10–5M

Explanation:

Have a great rest of your day
#TheWizzer

Answer:

The answer is B.

Explanation:

pretty quite, when everyones acc gets deleted SMH -;-

The question relates to Blood Splatter Analysis and relates to both law and Forensic science.

The three key dates in Blood Splatter History and what those dates mean to evidence today are:

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74 mph (64 KT)

Explanation:

when the wind exceeds 74 mph (64 KT), the storm is considered to be a hurricane.

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.

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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Iotopes of elements are atoms of the same element which differ in their mass numbers due to differences in neutron number in the nucleus.

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:

Natural selection is the process that selects the organism that can survive and reproduce in an altered environment. These behavioral changes are adapted.

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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Answer:

C.

Explanation:

The equation which best describes the reaction of calcium and zinc carbonate to form calcium carbonate and zinc is Ca+ZnCO₃→CaCO₃+Zn.

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:

Answer:

B, C, D, and E

Explanation:

Aconitate hydratase is the enzyme which performs an isomerization reaction carried out by dehydration and hydration steps.

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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Answer:

The Heat of a reaction is given as the heat content/heat of formation/enthalpies of the products minus the heat content/heat of formation/enthalpies of the reactants. If the potential energy diagram has the product(s) having a higher potential energy than the reactant(s), then the reaction is an endothermic reaction (this is why the reaction absorbs heat from the surroundings to try to make up for the lack of potential energy of the reactants) and the sign on the enthalpy change is visibly positive since H(products) > H(reactants) If the potential energy diagram has the reactant(s) having a higher potential energy than the product(s), then the reaction is an exothermic reaction (this is why the reaction releases heat to the surroundings to try to take care of the higher potential energy of the reactants) and the sign on the enthalpy change is visibly negative since H(reactants) > H(products).

Explanation:

hope it helps:)

Answer:

A. body muscles

The pressure needed to pump blood back to the heart is produced by the body muscles .

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.

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

Answer:

1 grams Hydrogen is equal to 0.992122546977 mole.

Explanation:

Hydrogen is equal to 0.992122546977 mole.

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.

The element formed after this portion of the decay series is

213,84Po. This is further explained below.

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.)

2.62J of energy will be required to warm a silver metal from a temperature of 25°C to 27.5°C.

The energy required in a calorimetry can be calculated using the following formula:

Q = m × c × ∆T

Where;

According to this question, 4.37 g of silver should be heated from 25°C to 27.5°C. The heat required is as follows:

Q = 4.37 × 0.24 × (27.5 - 25)

Q = 1.0488 × 2.5

Q = 2.62J

Therefore, 2.62J of energy will be required to warm a silver metal from a temperature of 25°C to 27.5°C.

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Answer:

4.9 kPa

Explanation:

Dalton's law of partial pressures states that the total pressure of a mixture of gases is the sum of the partial pressures of the individual gases.

In other words:
[tex]\displaystyle P_T = P_\text{O$_2$} + P_\text{N$_2$} + P_\text{He}[/tex]

The total pressure is 101.1 kPa. The partial pressure of He is 80.1 kPa. The partial pressure of N₂ is 16.2 kPa. Substitute and solve for O₂:

[tex]\displaystyle \begin{aligned} (101.2\text{ kPa}) & = P_\text{O$_2$} + (16.2\text{ kPa}) + (80.1\text{ kPa}) \\ \\ P_\text{O$_2$} & = 4.9\text{ kPa}\end{aligned}[/tex]

In conclusion, the partial pressure of oxygen in the balloon is 4.9 kPa.

It is true that decomposers such as bacteria recycle dead tissue into reusable chemicals for other producers, which are then eaten by consumers.

Nutrient recycling is the process by which essential elements in the ecosystem are in transition between abiotic and biotic factors.

In an ecosystem, the following groups of organisms exists:

Decomposers are responsible for breaking down dead tissues of living organisms leading to the release of nutrients to the soil. These nutrients are used by producers, which are then eaten by consumers.

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Answer:

Rain,Hail,Snow,sleet. Hope this helped you out!

A chemist is using a solution of HNO₃ that has a pH of 3.75. what is [H⁺] for the solution is 1.7 × 10⁻⁴M.

Concentration of H⁺ ion will be calculated by using the below equation of pH as:

pH = -log[H⁺]

or [H⁺] = [tex]10^{-pH}[/tex]

Given that, pH = 3.75

So concentration of H⁺ ion will be calculated as:

[H⁺] = [tex]10^{-3.75}[/tex]

[H⁺] = 1.7 × 10⁻⁴M

Hence concentration of H⁺ ion is 1.7 × 10⁻⁴M.

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The characteristic of a strong base is that it removes H⁺ ions from solution.

Strong bases are those substance which have a pH range in between the value of 7.1 to 14.

So, strong bases removes H⁺ ion from the solution.

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Answer:

It removes H+ ions from solution.

Explanation:

i got it right

Answer:

The volume of the system will change and maybe the shape of the system boundary

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.

The 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.

In 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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