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3 years ago

Magnesium bromide is a binary ionic compound. From its formula, MgBr2, how do you know that

Chemistry

2 answers:

Scilla [17]3 years ago

8 0

You that Mg is the metal if in the periodic table it lands between group 1-12. So yeas Mg is a metal because it lands in group 2.

andrew-mc [135]3 years ago

8 0

Answer: Magnesium loses electrons to form $Mg^{2+}$

Explanation:

An ionic bond is formed when an element completely transfers its valence electron to another element. Metals donate the electron and forms a positively charged ion called as cation. Non metals accept the electrons and forms a negatively charged ion called as anion.

Electronic configuration of magnesium:

$[Mg]:12: 1s^22s^22p^63s^2$

Magnesium atom will loose one electron to gain noble gas configuration and form magnesium cation with +2 charge.

$[Mg^{2+}]:10:1s^22s^22p^63s^0$

Electronic configuration of bromine

$[Br]:35:1s^22s^22p^63s^23p^64s^23d^{10}4p^5$

Bromine atom will gain one electron to gain noble gas configuration and form bromide ion with -1 charge.

$[Br^-]=1s^22s^22p^63s^23p^64s^23d^{10}4p^6$

Thus as magnesium forms a cation , it is the metal.

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If you have 85g of sulfur dioxide at STP, how many moles do you have?

Step2247 [10]

Answer: 1.32

Explanation:

Given

85 gm of sulfur dioxide is present at STP

The molar mass of sulfur dioxide is $32+2\times 16=64\ g/mol$

The number of moles of sulfur dioxide is

$\Rightarrow n=\dfrac{85}{64}\\\\\Rightarrow n=1.32\ \text{mol}$

3 0

3 years ago

What processes in the water cycle takes water from oceans and land masses?

krek1111 [17]

Answer:

Water Cycle

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This cycling of water is intimately linked with energy exchanges among the atmosphere, ocean, and land that determine the Earth's climate and cause much of natural climate variability.
The impacts of climate change and variability on the quality of human life occur primarily through changes in the water cycle. As stated in the National Research Council's report on Research Pathways for the Next Decade (NRC, 1999): "Water is at the heart of both the causes and effects of climate change."

<h2>Importance of the ocean in the water cycle</h2>

The ocean plays a key role in this vital cycle of water.
The ocean holds 97% of the total water on the planet; 78% of global precipitation occurs over the ocean, and it is the source of 86% of global evaporation.
Besides affecting the amount of atmospheric water vapor and hence rainfall, evaporation from the sea surface is important in the movement of heat in the climate system.
Water evaporates from the surface of the ocean, mostly in warm, cloud-free subtropical seas.
This cools the surface of the ocean, and the large amount of heat absorbed the ocean partially buffers the greenhouse effect from increasing carbon dioxide and other gases.
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This latent heat release is an important part of the Earth’s heat balance, and it couples the planet’s energy and water cycles.

The major physical components of the global water cycle include the evaporation from the ocean and land surfaces, the transport of water vapor by the atmosphere, precipitation onto the ocean and land surfaces, the net atmospheric transport of water from land areas to ocean, and the return flow of fresh water from the land back into the ocean.
. The additional components of oceanic water transport are few, including the mixing of fresh water through the oceanic boundary layer, transport by ocean currents, and sea ice processes.
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Illustration of the water cycle showing the ocean, land, mountains, and rivers returning to the ocean.
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6 0

2 years ago

7) A block of wood

melamori03 [73]

Answer:

Explanation:

7) A block of wood

has a length of 10.2

cm, a width of 6 cm

and a height of 4.1

cm. The wood has

a total mass of 179

grams. What is the

volume of the

wood and what is

the density of the

wood?

volume = L XW XH=10.2 X 6 X4.1 =250.92cm^3

DENSITY = M/V = 179gm/250.92 cm^3

=0.713 gm/cm^3

5 0

2 years ago

Scintillatium has a halflife of 16 minutes. if a sample has 800 grams, find a formula for its mass after t minutes.

hichkok12 [17]

<span>Halflife is the time needed for a radioactive molecule to decay half of its current mass. If t is the time elapsed, the formula for the halflife would be:
final mass= original mass * </span> $\frac{1}{2} ^{\frac{t}{halflife}$
<span>
If you put the information of the problem into the formula, the equation will be:
</span>final mass= original mass * $\frac{1}{2} ^{\frac{t}{halflife}$
final mass= 800g * $\frac{1}{2} ^{\frac{t}{16 min}$

8 0

3 years ago

4) Balance the following redox reaction in an acidic solution. What are the coefficients in front of H⁺ and Fe3+ in the balanced

Kryger [21]

Answer:

- The coefficients in front of H⁺ and Fe³⁺ are 8 and 5

- There are transferred 5 moles of e-

Explanation:

This is the reaction:

Fe²⁺(aq) + MnO₄⁻(aq) → Fe³⁺(aq) + Mn²⁺(aq)

Let's think the oxidation numbers:

Fe2+ changed to Fe3+

It has increased the oxidation number → OXIDATION

Mn in MnO₄⁻ acts with +7 and it changed to Mn²⁺

It has decreased the oxidation number → REDUCTION

Let's make the half reactions:

Fe²⁺ → Fe³⁺ + 1e⁻ (it has lost 1 mol of e⁻)

MnO₄⁻ + 5e⁻ → Mn²⁺ (it has gained 5 mol of e⁻)

Now we have to ballance the O. In acidic medium we complete with water as many oxygens we have, in the opposite side. We have 4 O in reactant side, so we fill up with 4 H2O in products side.

MnO₄⁻ + 5e⁻ → Mn²⁺ + 4H₂O

Now we have to ballance the H, so as we have 8 H in products side, we complete with 8H⁺ in reactants, this is the complete half reaction:

8H⁺ + MnO₄⁻ + 5e⁻ → Mn²⁺ + 4H₂O

Notice that have 1e⁻ in oxidation and 5e⁻ in reduction. We must multiply (x5) the half reaction of oxidation, so the electrons can be cancelled.

(Fe²⁺ → Fe³⁺ + 1e⁻ ) .5

5Fe²⁺ → 5Fe³⁺ + 5e⁻

8H⁺ + MnO₄⁻ + 5e⁻ → Mn²⁺ + 4H₂O

We sum both half reactions:

5Fe²⁺ + 8H⁺ + MnO₄⁻ + 5e⁻ → 5Fe³⁺ + 5e⁻ + Mn²⁺ + 4H₂O

The electrons are cancelled, so the ballanced reaction is this:

5Fe²⁺ + 8H⁺ + MnO₄⁻ → 5Fe³⁺ + Mn²⁺ + 4H₂O

3 0

3 years ago