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4 years ago

This is science what about this one? According to modern atomic theory, _____ can't move from one energy

1 answer:

5 0

According to modern atomic theory, electrons can't move from one energy
level to another. It is not that it cannot really move but electrons tend to stay at a level with the lowest energy possible. Hope this answers the question. Have a nice day.

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does a reaction occur when an aqueous solution of calcium iodide and sodium sulfate are combined. If a reaction does occur write

lara [203]

Answer:

Yes. Ca²⁺(aq) + SO₄²⁻(aq) ⟶ CaSO₄(s)

Step-by-step explanation:

The possible reaction is

CaI₂ + Na₂SO₄ ⟶ CaSO₄ + 2NaI

To predict a reaction, you must know the solubility rules.

The important ones for this question are

Salts containing Na⁺ are soluble. Thus, NaI is soluble.
Most sulfates are soluble, but CaSO₄ is not. Thus, CaSO₄ is a precipitate, and a reaction occurs.

Molecular equation

CaI₂(aq) + Na₂SO₄(aq) ⟶ CaSO₄(s) + 2NaI(aq)

Ionic equation

Ca²⁺(aq) + 2I⁻(aq) + 2Na²⁺(aq) + SO₄²⁻(aq) ⟶ CaSO₄(s) + 2Na⁺(aq) + 2I⁻(aq)

Net ionic equation

Cancel all ions that appear on both sides of the reaction arrow (underlined).

Ca²⁺(aq) + 2I⁻(aq) + 2Na²⁺(aq) + SO₄²⁻(aq) ⟶ CaSO₄(s) + 2Na⁺(aq) + 2I⁻(aq)

The net ionic equation is

Ca²⁺(aq) + SO₄²⁻(aq) ⟶ CaSO₄(s)

5 0

3 years ago

QUESTION 6 Consider the following reaction between the diatomic and monatomic forms of iodine: I2 (g) <-> 2I (g) When 0.09

aalyn [17]

Answer: The equilibrium constant is $3.3\times 10^{-4}$

Explanation:

Initial concentration of $I_2$ = 0.095 M

The given balanced equilibrium reaction is,

$I_2(g)\rightleftharpoons 2I(g)$

Initial conc. 0.095 M 0 M

At eqm. conc. (0.095-x) M (2x) M

Given : 2x = 0.0055

x = 0.00275

The expression for equilibrium constant for this reaction will be,

$K_c=\frac{[l]^2}{[I_2]}$

Now put all the given values in this expression, we get :

$K_c=\frac{(0.0055)^2}{(0.095-0.00275)}$

$K_c=\frac{(0.0055)^2}{0.09225}=0.00033$

Thus the equilibrium constant is $3.3\times 10^{-4}$

3 0

3 years ago

Describe how magnetic forces and electric forces are similar and different from each other

PtichkaEL [24]

ANSWER:

Objects that have the same charge, both positive or both negative, repel each other, and those with opposite charges attract each other. ... Similar to electric charges, opposite poles attract, and like poles repel. The stronger the magnets and the closer together they are, the stronger the magnetic force between them.

4 0

3 years ago

The lung capacity of the blue whale is 4900 L . Convert this volume into gallons

adell [148]

1 liter = 2.11 pints
8 pints = 1 gallon

4900 L * (2.11 pints/1 L) * (1 gallon/8 pints) = 1292.375 gallons

4900 has 2 significant figures, so our final answer should have two. Your final answer is 1300 gallons.

8 0

4 years ago

Read 2 more answers

A certain half-reaction has a standard reduction potential +0.80 V . An engineer proposes using this half-reaction at the anode

Strike441 [17]

Answer:

a. Minimum 1.70 V

b. There is no maximum.

Explanation:

We can solve this question by remembering that the cell potential is given by the formula

ε⁰ cell = ε⁰ reduction - ε⁰ oxidation

Now the problem states the cell must provide at least 0.9 V and that the reduction potential of the oxidized species 0.80 V, thus

ε⁰ reduction - ε⁰ oxidation ≥ ε⁰ cell

Since ε⁰ oxidation is by definition the negative of ε⁰ reduction , we have

ε⁰ reduction - ( 0.80 V ) ≥ 0.90 V

⇒ ε⁰ reduction ≥ 1.70 V

Therefore,

(a) The minimum standard reduction potential is 1.70 V

(b) There is no maximum standard reduction potential since it is stated in the question that we want to have a cell that provides at leat 0.9 V

8 0

3 years ago