Which of the following is a radioactive element?Sodium, Fluorine,Oxygen
francium

Answer:

Explanation:

bblblblbllbllbllb1234w

Answer: Jupiter is made up predominantly of hydrogen. Jupiter's Moon, Europa, might be able to support life. Jupiter has 3 skinny rings. Usually around -234 degrees Fahrenheit.

The solubility of lead chromate : s= 5.29 x 10⁻⁷ mol/L

Given

Ksp  for PbCl,=2.8x10*-13 mole/dmº

PbCrO4

Required

The solubility

Solution

P b C r O ₄ ( s ) ⇌ P b²⁺( a q) +C r O ₄ ⁻²( a q )

s                     s               s

s= solubility

Ksp P b C r O ₄  = s²

K s p  = [ P b ²⁺] [C r O ₄ ⁻² ]= 2.8x10⁻¹³

s = √2.8x10⁻¹³

s= 5.29 x 10⁻⁷ mol/L

Answer:

When an electric charge moves, heat is dissipated due to the drift velocity hence current is induced

Answer:

a. True

b. True

c. False

d. True

Explanation:

a). A a very low substrate concentration , [tex]$S<< Km$[/tex]. Thus according to the Machaelis-Menten equation becomes

[tex]$V_0 = \frac{V_{max} \times [S]}{Km}$[/tex]

Here since the [tex]$V_0$[/tex] varies directly to the substrate concentration [S], the initial velocity is lower than the maximal velocity. Thus option  (a) is true.

b). The Michaelis -Menten kinetics equation states that :

   [tex]$V_0 = \frac{V_{max} \times [S]}{Km+[S]}$[/tex]

  Here the initial velocity changes directly with the substrate concentration as [tex]$V_0$[/tex] is directly proportional to [S]. But [tex]$V_{max}$[/tex] is same for any particular concentration of the enzymes. Thus, option (b) is true.

c). As the substrate concentration increases, the initial velocity also increases. Thus option (c) is false.

d). Option (d) explains the procedures to estimate the initial velocity which is correct. Thus, option (d) is true.

Answer:

Energy produced deep inside Earth heats rock in the mantle. ... As it becomes less dense, the heated rock rises toward Earth's surface. The cooler, denser rock surrounding the heated rock sinks, as Figure 5 shows. In this way, heat inside Earth moves toward the cooler crust.

Explanation:

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Energy from Earth’s interior affect surface changes due to:

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Answer: yes they can

Explanation: Mixtures can be physically separated by using methods that use differences in physical properties to separate the components of the mixture, such as evaporation, distillation, filtration and chromatography.

Answer: A mixture is composed of two or more types of matter that can be present in varying amounts and can be physically separated by using methods that use physical properties to separate the components of the mixture, such as evaporation, distillation, filtration and chromatography.

Explanation:

Yes

Answer:

B. Indicator

Explanation:

An indicator is used to determine whether an acid or alkali has been added to a solution.

An acid or alkali changes the hydrogen ion concentration in solution. This is indicated by the pH of the solution after which the acid or alkali has been added.

By definition, the correct answer is option 5. A barium atom (Ba) would form its most stable ion by the loss of two electrons.

An ionic bond is produced between metallic and non-metallic atoms, where electrons are completely transferred from one atom to another. During this process, one atom loses electrons and another one gains them, forming ions. Usually, the metal gives up its electrons forming a cation to the nonmetal element, which forms an anion.

In other words, anions are negatively charged ions and are formed when metals gain electrons. Cations are positively charged ions and are formed when a metal loses electrons.

The electrostatic attraction between positives and negatives attracts the particles to each other and creates an ionic compound.

A barium (Ba) atom is a metal, so it loses 2 electrons to comply with the octet rule, which states that the atoms of the elements bond together in an attempt to complete their valence shell, leaving the atom stable with 8 electrons in its last shell and thus be stable.

Finally, the correct answer is option 5. A barium atom (Ba) would form its most stable ion by the loss of two electrons.

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Answer:

6.208 mol

Explanation:

Mass of Bromine Liquid = 496g

Number of moles = ?

Relationship between number of moles and mass is given as;

Number of moles = Mass / Molar mass

Molar mass of Bromine = 79.9g

Number of moles = 496 / 79.9 = 6.208 mol

Answer:

Reflection

Explanation:

The light from Earth's surface, reflected back towards the Moon, can illuminate it all the same. This is why, when the Moon is in a crescent phase, you can still see features on the dark portion of the Moon: we call this reflected, illuminating light the phenomenon of Earthshine.

When waves travel from one medium to another, they interact. When waves hit a new medium, they may bend or spread out instead of bouncing back like an echo. These three interactions of waves with matter are known as reflection, refraction, and diffraction.

Interactions include reflection, refraction, and diffraction. An example of wave reflection is an echo. Refraction occurs when waves bend at an angle as they enter a new medium. When waves spread out as they travel through an opening in an obstacle, this is referred to as diffraction.

When two or more waves collide, they interact with one another. Wave interference is the interaction of waves with other waves. When two waves traveling in opposite directions collide, wave interference occurs.

Thus, the interactions of waves with matter are known as reflection, refraction, and diffraction.

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Answer:

pOH = 8.41

Explanation:

From the question given above, we obtained the following information:

Concentration of Hydrogen ion [H⁺] = 2.6×10¯⁶ M

pOH =?

Next, we shall determine the pH of the solution. This can be obtained as follow:

Concentration of Hydrogen ion [H⁺] = 2.6×10¯⁶ M

pH =?

pH = – Log [H⁺]

pH = – Log (2.6×10¯⁶)

pH = 5.59

Finally, we shall determine the pOH of the solution. This can be obtained as follow:

pH = 5.59

pOH =?

pH + pOH = 14

5.59 + pOH = 14

Collect like terms

pOH = 14 – 5.59

pOH = 8.41

Therefore, the pOH of the solution is 8.41

Answer:

8.41

Explanation:

Answer:

D. All living things provides heat and light on Earth.

Explanation:

its the sun that does that

Answer:

option d.

Explanation:

all living things provides heat and light on Earth.

Answer:

Here is your answer......

Answer:

The molar mass and molecular weight of C3H6O is 58.0791.

Explanation:

Answer:

The ricks were degraded over time by wind and water and were crushed down into tiny, smaller rocks, which is sand.

Explanation:

This is my first answer sorry im not that smart

Answer:

there's just a lot of drama around grumpy trumpy's StOlEN eLecTiOn which are all just fake claims. all his hardcore followers are brainwashed into believing anything he says, so people (especially people who are inside the capitol) fear that trump's followers might incite violence AGAIN even after they broke into the Capitol on the 6th.

That's why they have the National Guard and thousands of people to keep the building secure during Biden's Inauguration.

hope this helps!

Answer:

becous thear are two products

Explanation:

The statement is "Because there is only on reactant."

Reactant are raw materials that react with one another and form products.

What is decomposition reaction?

A decomposition reaction can be defined as a chemical reaction in which one reactant breaks into two or more product.

Hence the correct explanation about the reaction is "because there is only one reactant"

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Answer:

Neutrons

Explanation:

Subatomic particles are components atoms, and they include protons, electrons and neutrons. In different isotopes of an atom, the number of neutrons that the atom contains is what changes.

I hope this helps!

Answer:

im pretty sure its the last one

Explanation:

if plants dont have sun light they will die because the sunlight gives them the nutrients to survive

Answer:

two electrons.... oxygen needs two electrons to attain stability

Answer:

_ NH4NO3 -> _ N2O + 2 H2O

Explanation:

By having 2 water molecules, we reach the 4 H atoms and 3 O atoms that are present on the left side. We don't add any other coefficients because we already have enough N atoms and we don't have to manipulate the left side at all.

Answer:

All ions must a overall charge

Explanation:

Answer:

i belive its B

Explanation:

0.042 moles of Hydrogen evolved

Given

I = 1.5 A

t = 1.5 hr = 5400 s

Required

Number of Hydrogen evolved

Solution

Electrolysis of water ⇒ decomposition reaction of water into Oxygen and Hydrogen gas.

Cathode(reduction-negative pole) : 2H₂O(l)+2e⁻ ⇒ H₂(g)+2OH⁻(aq)

Anode(oxidation-positive pole) : 2H₂O(l)⇒O₂(g)+4H⁻(aq)+4e⁻

Total reaction : 2H₂O(l)⇒2H₂(g)+O₂(g)

So at the cathode H₂ gas is produced

Faraday : 1 mole of electrons (e⁻) contains a charge of 96,500 C

[tex]\tt mol~e^-=\dfrac{Q}{96500}[/tex]

Q = i.t

Q = 1.5 x 5400

Q = 8100 C

mol e⁻ = 8100 : 96500 = 0.084

From equation at cathode , mol ratio e⁻ : H₂ = 2 : 1, so mol H₂ = 0.042

Answer: The answer is 2 and 4

Answer: B

Explanation: Some types of waves are able to travel through space. Some can even travel through solids and liquids.