Of the reactions below, which one is not a combination reaction? A) 2Mg + O2 -->2MgO B) 2CH4 + 4O2-->2CO2+ 4H2O C+O2-->CO2 D) CaO +H2O --> Ca(OH)2 E) 2N2 + 3H2-->2NH3

Answer:  1. 0.120 mol NaCl

Explanation: 1. Solution: n = 0.300 L soln × (0.400 mol NaCl/1 L soln) = 0.120 mol NaCl

False

According to Newton's Second Law of Motion, the net force on an object is equal to the product of its mass

(M) and acceleration (A)

.

That is: F(net)= M×A

If the net force on the object is zero, the acceleration of the object is also zero.

However, this does not mean that the object is in rest. It means that the object will continue to maintain its state of rest or uniform motion, according to Newton's first law of motion. If the object was moving, it will continue to move with a constant velocity.

Hence, the statement is false.

Answer:

Ni⁻

Explanation:

To check which atom or ion does not have filled d orbital we will write the electronic configuration of given atoms and ions.

Ni⁻₂₈ = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s² 3d⁹

One more electron is added into the 3d but still d is not filled.

In⁺₄₉ = [Kr]4d¹⁰ 5s² 5p⁰

One electron lose from 5p and form cation. In⁺ have filled d subshell.

Ag₄₇ = [Kr] 4d¹⁰ 5s¹

Ag have filled d subshell.

Pd₄₆ = [Kr] 4d¹⁰

Palladium also have filled d orbital.

Answer:

2.29 × 10²⁴ atoms Na

Explanation:

Step 1: Define

Avagadro's Number: 6.02 × 10²³ atoms, molecules, formula units, etc.

Step 2: Stoichiometry

\(3.80 \hspace{3} mol \hspace{3} Na(\frac{6.02(10)^{23} \hspace{3} atoms \hspace{3} Na}{1 \hspace{3} mol \hspace{3} Na} )\) = 2.2876 × 10²⁴ atoms Na

Step 3: Simplify

We have 3 sig figs.

2.2876 × 10²⁴ atoms Na ≈ 2.29 × 10²⁴ atoms Na

If two actuating cylinders which have the same cross sectional area but different lengths of stroke are connected to the same source of hydraulic pressure, they will exert equal amounts of force and will not move at the same rate of speed.

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Part C the answer is Δ[S8]/Δt = 0.0026 M/s

Parte D the answer is v = 0.0026 M/s

Answer:

7.8286e+23

Explanation:

Use Avogadro's number

It forms magnesium oxide by reacting with oxygen

The balanced equation is provided by

\(\\ \rm\hookrightarrow 2Mg+O_2=2MgO\)

On both sides

Hence balanced

The statement true about the environment of most of the earth is that it usually in equilibrium but easy to change on a small scale.

Therefore, Option 3 is correct statement

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The amount of Faradays and moles of electrons are required to produce by electrolysis are calculated thus.

(a) The molar mass of Al is 26.98 g/mol, which means that one mole of Al will require 3 moles of electrons to be produced. To find out the number of Faradays needed to produce 2.70 g of Al, calculate the number of moles of Al:

moles of Al = mass of Al / molar mass of Al

moles of Al = 2.70 g / 26.98 g/mol

moles of Al = 0.100 mol

Faraday's law of electrolysis to calculate the number of Faradays needed:

Faradays = moles of substance / n

n = number of electrons per mole of substance

n for Al is 3, so:

Faradays = 0.100 mol / 3

Faradays = 0.0333 F

Therefore, 0.0333 Faradays are needed to produce 2.70 g of Al.

(b) The molar mass of Mg is 24.31 g/mol, which means that one mole of Mg will require 2 moles of electrons to be produced. To find out the number of Faradays needed to produce 6.0 g of Mg, calculate the number of moles of Mg:

moles of Mg = mass of Mg / molar mass of Mg

moles of Mg = 6.0 g / 24.31 g/mol

moles of Mg = 0.247 mol

Use Faraday's law of electrolysis to calculate the number of Faradays needed:

Faradays = moles of substance / n

n = number of electrons per mole of substance

n for Mg is 2, so:

Faradays = 0.247 mol / 2

Faradays = 0.1235 F

Therefore, 0.1235 Faradays are needed to produce 6.0 g of Mg.

(c) The molar mass of H₂ is 2.02 g/mol, which means that one mole of H₂ will require 2 moles of electrons to be produced. To find out the number of Faradays needed to produce 10 g of H₂, calculate the number of moles of H₂:

moles of H₂ = mass of H₂ / molar mass of H₂

moles of H₂ = 10 g / 2.02 g/mol

moles of H₂ = 4.95 mol

Now use Faraday's law of electrolysis to calculate the number of Faradays needed:

Faradays = moles of substance / n

n = number of electrons per mole of substance

n for H₂ is 2, so:

Faradays = 4.95 mol / 2

Faradays = 2.475 F

Therefore, 2.475 Faradays are needed to produce 10 g of H₂.

(d) The molar mass of Cl₂ is 70.91 g/mol, which means that one mole of Cl₂ will require 2 moles of electrons to be produced. To find out the number of Faradays needed to produce 71 g of Cl₂, calculate the number of moles of Cl₂:

moles of Cl₂ = mass of Cl₂ / molar mass of Cl₂

moles of Cl₂ = 71 g / 70.91 g/mol

2 (a) To produce 27g of Al by electrolysis, calculate the number of moles of Al and then use the equation:

1 mole of Al + 3 moles of e⁻ → 1 mole of Al³⁺

Molar mass of Al = 27 g/mol

Number of moles of Al = 27 g / 27 g/mol = 1 mole

Therefore, 3 moles of electrons are required to produce 1 mole of Al.

To produce 27g of Al:

3 moles of e⁻ / 1 mole of Al × 1 mole of Al = 3 moles of e⁻

So, 3 moles of electrons are required to produce 27g of Al by electrolysis.

(b) To produce 8g of O₂ by electrolysis, calculate the number of moles of O₂ and then use the equation:

2 moles of H₂O + electricity → 2 moles of H₂ + 1 mole of O₂

Molar mass of O₂ = 32 g/mol

Number of moles of O₂ = 8 g / 32 g/mol = 0.25 mole

Therefore, 0.5 moles of electrons are required to produce 0.25 mole of O₂.

To produce 0.25 mole of O₂:

0.5 moles of e⁻ / 1 mole of O₂ × 0.25 mole of O₂ = 0.125 moles of e⁻

So, 0.125 moles of electrons are required to produce 8g of O₂ by electrolysis.

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The gas which behaves most ideally at a given temperature and pressure is He (helium). Ideal gas behavior is described by the Ideal Gas Law, which states that the behavior of a gas is a function of its temperature, pressure, and volume. Gases behave more ideally when they have low intermolecular forces and small molecular sizes. The correct option is D.

The behavior of a gas can be described by its compressibility factor (Z). An ideal gas would have a compressibility factor of 1 at all temperatures and pressures. However, most gases deviate from ideal behavior at high pressures and/or low temperatures.

The degree to which a gas deviates from ideal behavior can be described by the Van der Waals equation, which takes into account the volume of the gas particles and the attractive forces between them. The equation is: (P + a/V²)(V - b) = RT, where P is pressure, V is volume, T is temperature, R is the gas constant, a and b are constants specific to each gas.

He (helium) has a very small atomic size and almost no intermolecular forces, which makes it the gas that most closely follows ideal gas behavior. Therefore, it is expected to behave most ideally at a given temperature and pressure. On the other hand, gases like NH3 (ammonia) and H2O (water vapor) have much larger molecular sizes and significant intermolecular forces, leading to a greater deviation from ideal gas behavior.

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Show the bolded items and the boxes.

mass = triple beam balance; volume = l X w X h

Explanation:

Measure the solid to determine its length, width, and height. Multiply all three to get its volume. Weigh the solid to determine its weight. Divide weight by volume to get density. Convert as needed to the appropriate units.

C = m V . The unit of concentration is typically given as g/mL because the solute mass is frequently given in grammes and the volume is frequently given in milliliters. However, there are a tone of other mass and volume unit combinations that are possible.

Given that a solution consists of both a solute and a solvent, its total volume is equal to the sum of the volumes of both the solute and the solvent it contains.

A solution's concentration is an indicator of how much solute has dissolved in a specific volume of solvent or solution. When there is a significant amount of dissolved solute in a solution, it is said to be concentrated. When a dissolved solute is present in a solution, it is said to be diluted.

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Answer:

0.010195916576195

Explanation:

Answer:

2 : 2

Explanation:

The balanced chemical equation is given as:

            2K   +     Cl₂   →    2KCl

From the balanced reaction equation, we can conclude that;

Therefore, the mole ratio is 2:2 or 1:1 in the simplest form.

Answer:

Mass number

Explanation:

We don't have to find the volume .We have to write the formula to find

\(\\ \bull\tt\longmapsto PV=nRT\)

\(\\ \bull\tt\longmapsto V=\dfrac{nRT}{P}\)

Answer:

0.03262841

I tried, hope this helps :)

Answer:

0.032 lbs

Explanation:

Divide the mass value by 454.

1) Because ΔH is positive, the reaction is endothermic.

2) Yes, absorbed, because in endothermic reaction heat is absorbed.

3) Heat will be released 26.9 KJ

Enthalpy depends only on the system's composition, temperature, and pressure; it is unaffected by the system's history. It is a quality or state function that resembles energy and has energy-like properties (and is thus measured in units of joules or ergs).

Given reaction is

2HgO(s) → 2Hg(l) + O₂(g)  ΔH = 182KJ

1) Because ΔH is positive, the reaction is endothermic.

2) Yes, because heat is absorbed during endothermic reactions.

3)  Heat will be released 26.9 KJ

According to the reaction,

2 moles HgO of release =  182 KJ heat

2×216.59 HgO release =  182 KJ heat

64 g HgO release =  182×64/2×216.59 KJ heat

64 g HgO release = 26.9 KJ.

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Complete question is attached below

In radioactive decay, with each successive half-life, half the remaining sample decays to form another element.

In most cases, a new element is created from the destroyed nuclei with each new half-life.

The same element is created during the decay of an isotope since the daughter nucleus has the same amount of protons (same atomic number).

A new element is created when a daughter nucleus has the same number of neutrons as the parent nucleus, or an isotone (new atomic number)

Isobar: daughter nucleus has identical mass number; this might be an example of beta decay; the decayed nucleus retains its mass number but adds a proton in place of a lost electron, resulting in the formation of a new element with an increased atomic number by one.

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When the coordination number of a complex is 4, the common geometries that can be adopted by the complex are tetrahedral and square planar.

A tetrahedral complex has four ligands that are arranged symmetrically around the central metal atom to form a tetrahedron.

The bond angles between the ligands are 109.5 degrees, and the geometry is often seen in complexes of transition metals with ligands that have lone pairs of electrons.

On the other hand, a square planar complex has four ligands that are arranged in a plane around the central metal atom, with bond angles of 90 degrees.

This geometry is often seen in complexes of transition metals with ligands that are strong-field and can form pi bonds with the metal atom.

Trigonal bipyramidal and see-saw geometries are not common for complexes with a coordination number of 4, as they require a coordination number of 5.

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Answer: 15.999 grams.

Explanation: The molar mass of an element is the mass of one mole of that element. You can also solve this with a little bit of math.

\(15.999gO*\frac{1molO}{15.999gO} =1molO\)

I hope this helps! Pls mark brainliest!! :)

Answer:

Color. I thinkkk.

Phyiscal properties are defined as properties that can be measured or observed without changing the chemical nature of the substance.

Some examples of phsyical properties are:

- Color

- Density

- Volume

- Mass

- Boiling or Melting Points

The effect of low [s] is that the rate of the reaction will decrease and the effect of high [s] is that the rate of the reaction will increase. When Vo is one-half of Vmax, the effect is that the reaction has reached its half-maximum velocity, or that the reaction has reached its maximum efficiency.

The rate of the reaction will decrease in the case of low [s] as the substrate concentration is too low to support the reaction. On the other hand, the rate of reaction will increase in the case of high [s] as there is a greater amount of substrate to drive the reaction.

To understand these effects in a better way, we can use the Michaelis-Menten equation to calculate the rate of reaction at various substrate concentrations (Vo and Vmax) and also the reaction's maximum velocity (Vmax):-

V = Vmax[S]/(Km + [S])

Where Vmax is the maximum velocity of the reaction, Km is the Michaelis constant, and [S] is the concentration of the substrate.

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The correct reaction that illustrates AH°f for Mg(NO2)2 is:
Mg(s) + 2 NO2(g) + 1/2 O2(g) → Mg(NO2)2(s)

This reaction shows the formation of one mole of solid Mg(NO2)2 from its constituent elements in their standard states, with all reactants and products in their standard states at 25°C and 1 atm pressure. This is the definition of AH°f or the standard enthalpy of formation.

The other reactions listed involve either the decomposition of Mg(NO2)2 or the dissolution of its ions in water, which do not directly measure AH°f.
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Answer:

The substance is acidic.

Explanation:

When a substance is able to dissolve in water, it means that it is ionic. This just means that the polarity of the water and the polarity of the substance will attract each other to their positive and negative ends respectively. (Positive attracts negative and negative attracts positive).

Litmus paper that is blue and then turns red when introduced to a substance, is known to be acidic.

The opposite can be said when red litmus paper turns blue when introduced to a substance; this means the substance is basic.

Also, if it is sour, then that means it is acidic! Some examples of sour things that are acidic are soft drinks, apples and lemons/limes.

Answer:

5.08x10⁻¹⁹ Joules

Explanation:

We are given the frequency (7.66x10¹⁴)

The equation that we use to find Energy is the following:

E=hf, where h is Planck's constant and f is the frequency.

We plug those numbers in the equation:

\(E= (6.6261 x10^-^3^4J) (7.66x10^1^4 Hz) = 5.08x10^-^1^9 J\)