In which orbitals would the valence electrons for selenium be placed ?

Answer:

HF is the limiting reactant

Explanation:

The balanced equation for the reaction is given below:

SiO₂ + 4HF —> SiF₄ + 2H₂O

From the balanced equation above,

1 mole of SiO₂ reacted with 4 moles of HF.

Finally, we shall determine the limiting reactant. This can be obtained as illustrated below:

From the balanced equation above,

1 mole of SiO₂ reacted with 4 moles of HF.

Therefore, 7.5 moles of SiO₂ will react with = 7.5 × 4 = 30 moles of HF.

From the calculation made above, we can see clearly that it will take a higher amount (i.e 30 moles) of HF than what was given from the question (i.e 5 moles) to react completely with 7.5 moles of SiO₂.

Therefore, HF is the limiting reactant and SiO₂ is the excess reactant.

Answer:

v = 15/2

Decimal Form:

v = 7.5

Mixed Number Form:

v = 7  1/2

Explanation:

Hope this helps!

Answer:

Liquids and gases flow easily because their particles can move or slide past one another.

Explanation:

Hope this helped Mark BRAINLEST!!

Answer:

D. Both atoms share their electrons.

Explanation:

Answer:

POT B

Explanation:

Because Pot B contains lesser amount of water, it is going to have the hottest water compared to pot A.

Since the amount of heat is constant, in pot B less water molecules would share the heat, compared to pot A where a larger amount of water would have to share the heat.

How does the water help a fossil form?

The answer is 1

Answer:

[tex]\boxed {\boxed {\sf 60 \%}}[/tex]

Explanation:

Percent yield is a ratio of the actual yield to the theoretical yield. It is found using this formula:

[tex]\% \ yield= \frac {actual \ yield}{theoretical \ yield} *100[/tex]

The actual yield is 12 liters, because that was actually produced in the lab.

The theoretical yield is 20 liters, because that was the expected yield.

[tex]\% \ yield= \frac {12 \ L}{20\ L} *100[/tex]

[tex]\% \ yield= 0.6*100[/tex]

[tex]\% \ yield= 60[/tex]

For this reaction, the percent yield is 60%.

Neutralization reaction

Hello, in the following reaction HBr is strong acid when reacts with Amphoteric Aluminium hydroxide gives water & AlBr3 as salt.

We know that in neutralization reaction

acid & bases reacts to give salt and water. Hence following reaction is neutralization reaction.

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Answer:

Maybe you could do something with nuclear power plants and how we use those to create electrical energy for our phones, houses etc?

Answer:

Explanation:

ndicator species (IS) are animals, plants, or microorganism used to monitor changes in our environment. For example, they can tell us about the impact of pollution on an ecosystem, or how well an impaired environment is being managed or restored.

Answer:

Mass ratio:

a. Approximately [tex]51.2\%[/tex].

b. Approximately [tex]35.3\%[/tex].

c. Approximately [tex]43.2\%[/tex].

Explanation:

Look up the relative atomic mass of each element on a modern periodic table:

For example, the relative atomic mass of [tex]\rm Al[/tex] is [tex]26.982[/tex]. Hence, the mass of one mole of [tex]\rm Al\![/tex] atoms would be (approximately) [tex]26.982\; \rm g[/tex].

Calculate the formula mass of [tex]\rm H_2O[/tex]:

[tex]\begin{aligned} & M({\rm H_2O}) \\ &= 2 \times 1.008 + 15.999 \\ &= 18.015\; \rm g \cdot mol^{-1}\end{aligned}[/tex].

Calculate the formula mass for each of the hydrates:

[tex]\begin{aligned}& M({\rm MgSO_4 \cdot {7\, H_2O}}) \\ &= 24.305 + 32.06 + 4 \times 15.999 \\ & \quad\quad + 7 \times (2 \times 1.008 + 15.999) \\ &= 246.466\; \rm g \cdot mol^{-1}\end{aligned}[/tex].

[tex]\begin{aligned}& M({\rm LiC_2H_3O_2 \cdot {2\, H_2O}}) \\ &= 6.94 + 2 \times 12.011 + 3 \times 1.008 + 2 \times 15.999 \\ & \quad\quad + 2 \times (2 \times 1.008 + 15.999) \\ &= 102.014\; \rm g \cdot mol^{-1}\end{aligned}[/tex].

[tex]\begin{aligned}& M({\rm Al(NO_3)_3 \cdot {9\, H_2O}}) \\ &= 26.982 + 3 \times (14.007 + 3 \time 15.999) \\ &\quad \quad + 9 \times (2 \times 1.008 + 15.999) \\ &= 375.129\; \rm g \cdot mol^{-1}\end{aligned}[/tex].

The mass of [tex]1\; \rm mol[/tex] of [tex]{\rm MgSO_4 \cdot {7\, H_2O}}[/tex] formula units is [tex]246.466\; \rm g[/tex].

There are seven mole of [tex]\rm H_2O[/tex] formula units in that many [tex]{\rm MgSO_4 \cdot {7\, H_2O}}[/tex] formula units. The mass of that [tex]7\; \rm mol[/tex] of [tex]\rm H_2O\![/tex] formula units would be [tex]7 \; \rm mol \times 18.015\; \rm g \cdot mol^{-1} = 127.105\; \rm g[/tex].

Hence, the percentage mass of [tex]\rm H_2O[/tex] in [tex]{\rm MgSO_4 \cdot {7\, H_2O}}[/tex] would be:

[tex]\begin{aligned}\frac{127.015\; \rm g}{246.466\; \rm g} \approx 51.2\%\end{aligned}[/tex].

Similarly:

Answer:

V = 39.38 L

Explanation:

Given that,

No. of moles of H₂, n = 2

Temperature, T = 300 K

Pressure, P = 1.25 atm

We need to find the volume occupied by the gas. We can use the ideal gas law to find it such that,

[tex]PV=nRT[/tex]

Where

R is gas constant, R = 0.08205 L-atm/mol-K

V is volume of the gas

Rearranging the above formula for V. So,

[tex]V=\dfrac{nRT}{P}\\\\V=\dfrac{2\times 0.08205\times 300}{1.25}\\\\V=39.38\ L[/tex]

So, the volume occupied by the gas is 39.38 L.

The set of explanations that has the correct representation for the chemical equation are aq and g. Thus the correct options are 3 and 4.

The chemical equation has been written with the symbols of the product and the reactant. The chemical equation has the moles of an element that has been reacted. The moles have written prior to the compound as the coefficient.

The compounds state has also been present in the chemical equation. The compounds in the reaction can be present as:

The symbol has been added to the compound to depict the state of the compound in the chemical reaction. The symbols used for the following states are:

The set of explanations that has the correct representation for the chemical equation are aq and g. Thus the correct options are 3 and 4.

For more information about the chemical equations, refer to the link:

https://brainly.com/question/21049751

Answer: 1.5 moles/L

Explanation:

Molarity = moles/ Liters

to find the molarity of BaO: 3moles/2L = 1.5 moles/L

Answer:

84% yield

42/50 = 0.84 = 84%

Answer: around 137.33

Explanation:

Answer:

10.54 M

Explanation:

First you multiply 154.9 by 262 to get the mols and then you divide that number by 3850.45540796906 L and you get 10.54 M.

Answer:

The term "phenotype" refers to the observable physical properties of an organism; these include the organism's appearance, development, and behavior

An organism's phenotype describe appearance, development, behavior, maybe even levels of hormones or blood cells.

Answer:

Explanation:

Answer:

A WAVE CARRIED THROUGH A ROPE

Explanation:

I chose a wave on water and got it WRONG

Answer:

Beryllium.

Silicon.

Explanation:

Beryllium has 2 electrons in their outermost shell and has highly reactive than boron because Boron needs 3 electrons to lose whereas, beryllium needs to lose only 2 electrons to get stability. Silicon has 4 electrons in its outermost shell and is less reactive than aluminum because aluminum has to lose 3 electrons to get stability as compared to silicon which needs 4 electrons to lose to be stable and non-reactive.

Answer:

Physical change

Explanation:

Cutting and freezing are both examples of physical changes that do not alter the chemical composition or properties of the object/substance.

Answer:

physical change

Explanation:

carrot lost its original shape

Answer:

39.6 g

Explanation:

The equation of the reaction is;

2Mg(s) + O2(g) --------> 2MgO(s)

To obtain the limiting reactant;

Number of moles in 26.4 g of Mg = 26.4g/24 g/mol = 1.1 moles

If 2 moles of Mg yields 2 moles of MgO

1.1 moles of Mg yields 1.1 * 2/2 = 1.1 moles of MgO

Number of moles in 26.4 g of O2 = 26.4 g/32g/mol = 0.825 moles

If 1 mole of O2 yields 2 moles of MgO

0.825 moles of O2 yields 0.825 moles * 2/1 = 1.65 moles of MgO

Hence Mg is the limiting reactant.

Theoretical yield of MgO = 1.1 moles of MgO * 40 g/mol = 44 g

Percent yield = 90%

Percent yield = actual yield/theoretical yield * 100

Actual yield = Percent yield * theoretical yield/100

Actual yield = 90 * 44/100

Actual yield = 39.6 g

Answer:

Temporal lobes

Explanation: They are right above the ears...And they help us process sounds...They are also important for learning and memory, as well as the understanding of language

Answer: Your answer is J

Explanation: This can occur when moon is closest to earth.

So the moon in between earth and sun.

Also factually the moon can effect human behavior, because humans are made up of some percent of water.

Answer:

Temperature is a measure of "average kinetic energy" of the particles in an object

Answer:

The electronic configuration of iron is: Ar3d64s2. the two electrons in the 4s orbital are paired, and two of the electrons in the 3d orbitals are paired leaving four unpaired electrons. In general when you are populating the p, d, f, etc

Explanation:

hope dis help

Answer:

Particles in a: gas are well separated with no regular arrangement. liquid are close together with no regular arrangement. solid are tightly packed, usually in a regular pattern.

Explanation: