Can someone help me please ??

Explanation:

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Explanation: A . upwelling .

Answer:

0.246 moles

Explanation:

Aluminum Sulfate is an ionic equation so we need to write the equation first with proper charges and subscripts:

Now that we know the ionic equation, we need to find the molar mass of Al_2(SO4)_3. There's 2 Aluminum's, each weighing 26.98 g/mol. There are 3 sulfates, each sulfate weighs 96.06 g/mol. We need to multiply the number of elements/compounds by their mass to get the total molar mass and then add them up (remember atomic mass = molar mass in g/mol):

We now know the molar mass of Al_2(SO4)_3 we need to find how many moles of it there are in an 84.2g sample. To do that, we need to do some dimensional analysis:

The grams of Al_2(SO4)_3 cancel so that we're left with moles of Al_2(SO4)_3 on top:

So in an 84.2g sample of Al_2(SO4)_3 (aka aluminum sulfate), there are 0.246 moles. This is correct because in one mole of Al_2(SO4)_3, there are 342.15g and the sample of 84.2 g of Al_2(SO4)_3 is way smaller than that, so our answer should be less than one mole, which it is.

I hope this helped!

Answer:

The metallic oxide is Li₂O

Explanation:

Let the metallic oxide be M₂O

Thus;

M₂O + H₂ = 2M + H₂O

Molar mass of M₂O = (2x + 16)

We assume Molar mass of M to be x.

We are told that 5.00 g of the metallic oxide produces 2.32 g of the metal.

By proportion, we can write the following;

5g of M₂O × (1 mole of M₂O/(2x + 16)) × (2 moles of M/1 mole of M₂O) = 2.32 g of M × 1 mole of M/x g of M

This cancels out to give us;

10/(2x + 16) = 2.32/x

Cross multiply to get;

10x = 2.32(2x + 16)

10x = 4.64x + 37.12

10x - 4.64x = 37.12

5.36x = 37.12

x = 37.12/5.36

x = 6.925 g/mol

The metal with a molar mass closest to this value of x is Lithium which has a molar mass of 6.94 g/mol

Thus the metal is Lithium and as such the metallic oxide is Li₂O

Answer:

68.22656

Explanation:

I think this is the answer.

Hope it's correct!

Answer:

68.22656

Explanation:

Speed

30.500001382

Meter per second

=  

68.22656

Miles per hour

Formula  

multiply the speed value by 2.237

(hope this helps can i plz have brainlist :D hehe)

Answer:

The answer to this problem is C

Explanation: Sodium is a metal with a low electronegativity it will form an ionic bond with a non metal with a high electronegativity.

Both Florine and Sulfur are non metals with high electronegativity.

Neon is a noble gas family VIII A and normally doesn't form any bonds at all.

MARK ME BRAINLIST

Answer:

Petrified wood contains minerals that are only found in fossils.

Explanation:

learned it in school (promise)

B) oxygen is oxidized.

Given

photosynthesis reaction

6CO2 + 6H20 ⇒ C6H12O6 + 602

Required

the oxidation compound

Solution

Oxidation-reduction reactions or abbreviated as Redox are chemical reactions in which there is a change in oxidation number

Oxidation is an increase in oxidation number, whereas Reduction is a decrease in oxidation number.

In the photosynthetic reaction, oxidation and reduction reactions occur in:

CO2 to C6H12O6 : reduction

Oxidation number of C from +4 to 0

H2O to O2 : oxidation

Oxidation number of O from -2 to 0

Answer:

Lithium oxide, Li₂O.  

Explanation:

Hello!  

In this case, according to the given amounts, it is possible to write down the chemical reaction as shown below:

[tex]M_2O+H_2\rightarrow 2M+H_2O[/tex]  

Which means that the metallic oxide has the following formula: M₂O. Next, we can set up the following proportional factors according to the chemical reaction:

Thus, we perform the operations in order to obtain:

[tex]\frac{10X}{(2X+16)}=2.32[/tex]  

So we solve for x as shown below:

[tex]10X=2.32(2X+16)\\\\10X=4.64X+37.12\\\\X=\frac{37.12}{10-4.64}\\\\X= 6.93g/mol[/tex]  

Whose molar mass corresponds to lithium, and therefore, the metallic oxide is lithium oxide, Li₂O.  

Best regards!

Answer:

There are no options provided dude,

But i guess the  answer will be a metal with valency 2 for sure as the subscript given for N in 'M3N2' is 2 so the valency of the metal u need to select will be 2 for sure

It can be magnesium or some other if the provided options in real question has Mg then its the answer

Answer:

There are two atoms in one hydrogen molecule.

Explanation:

Hello!

In this case, when going over chemical reactions, we need to realize about the amount of atoms of each element; thus, according to the given chemical reaction by which water is formed:

[tex]H_2+O_2\rightarrow H_2O[/tex]

It is seen there are two hydrogen atoms in the hydrogen molecule, two in oxygen and two hydrogen atoms and one oxygen atom in water; however, these reactions must be balanced according to the law of conservation of mass:

[tex]2H_2+O_2\rightarrow 2H_2O[/tex]

Which means we have two hydrogen molecules with two atoms each, one oxygen molecule with two atoms and two water molecules with two hydrogen atoms and one oxygen atom each.

Best regards!

Answer:

In plants mitosis takes place throughout life in growing regions called the meristems. Replacements as cells wear out. The cells of the skin and bone marrow are sites of active mitosis replacing skin cells and red blood cells that only have a limited life. Repair.

Explanation:

Answer:

leaf colors and root lengths

Explanation:

The original material has decayed 75%

Given

two half-life

Required

The decayed sample

Solution

General formulas used in decay:  

[tex]\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{t/t\frac{1}{2} }}}[/tex]

t = duration of decay  

t 1/2 = half-life  

N₀ = the number of initial radioactive atoms  

Nt = the number of radioactive atoms left after decaying during T time

t = 2 x t 1/2

Input the value :

[tex]\tt \dfrac{Nt}{No}=\dfrac{1}{2}^2=\dfrac{1}{4}=25\%[/tex]  

The amount of Nt = 25% No

Answer:

D. The cork looked like tiny rectangular rooms

Explanation:

The invention that helped scientists discover the cell is the microscope. Tell why Hooke called the structures he saw in the cork cellular("small rooms"). He called them cellular because the box like cells reminded him of the monks monasteries.

Answer:

and birds can fly without wings es hora de vomer

Answer:

2,47 * [tex]10^{24}[/tex] (molecules)

Explanation:

Avogadro's number is a very important relationship: 1 mole = 6,02 * [tex]10^{23}[/tex] atoms, molecules, protons, etc.

To convert from moles to molecules, multiply the molar amount by Avogadro's number.

4,1 mol * 6,02 * [tex]10^{23}[/tex]  ≈ 24,7 * [tex]10^{23}[/tex] = 2,47 * [tex]10^{24}[/tex] (molecules)

Therefore the third answer is correct

Answer:

The better solvent for separating the mixture of A and B is dichloromethane

Explanation:

Petroleum ether is the mixture of hydrocarbons obtained from the petroleum distillation with a boiling range between 35 and 60°C. Is used as a solvent.

In the other hand, the best solvent for separating a mixture in TLC is the one that has the higher difference between RF's of the compounds.

The difference in RF's in dichloromethane is:

|0.44 - 0.69| = 0.25

In petroleum ether:

|0.29 - 0.45| = 0.16

That means the better solvent for separating the mixture of A and B is dichloromethane

Answer: The isotopic mass of the other isotope is 38.16 amu

Explanation:

Mass of isotope X-37 = 37.24

fractional abundance of isotope X-37  = 0.7721

Mass of isotope X-38 = ?

fractional abundance of isotope X-38 = (1-0.7721)= 0.2279

Formula used for average atomic mass of an element :

[tex]\text{ Average atomic mass of an element}=\sum(\text{atomic mass of an isotopes}\times {{\text { fractional abundance}})[/tex]

[tex]37.45=\sum[(37.24\times 0.7721)+(x\times 0.2279)][/tex]

[tex]x=38.16[/tex]

Therefore, the isotopic mass of the other isotope is 38.16 amu

This question is incomplete, the complete question is;

Consider an experimental setup with two compartments separated by a phospholipid bilayer membrane containing ion channels selectively permeable only to chloride ions. The left compartment (also called inside) contains 1 mM Cl- and the right compartment (also called outside) contains 100 mM Cl-. What will the electrical potential be when the system attains equilibrium? [ assume body temperature; log 100 = 2, log 10 = 1, log 1 = 0, log 0.1 = -1, log 0.01 = -2]

Options;

a) -62 mV

b) -124 mV

c) +62 mV

d) 0 mV

e) +124 mV

Answer:

the electrical potential be when the system attains equilibrium is  –124mV

Option b) –124mV is the correct answer

Explanation:

Given the data in the question;

Two compartments are divided by lipid bilayer;

In inside compartment Cl- ion concentration- 1mM and out side of the cell concentration is 100mM

now we apply the Nernst equilibrium potential equation;

Chlorine ion valency is z = –1

So

[tex]E_{eq}[/tex] = 62/z × log(ion outside/ ion inside) [for Cl‐ ions]

[tex]E_{eq}[/tex] = (62 / –1) x log(  100 / 1 )

 [tex]E_{eq}[/tex] = -62 x 2 =

[tex]E_{eq}[/tex]  = –124mV

Therefore, the electrical potential be when the system attains equilibrium is  –124mV

Option b) –124mV is the correct answer

Answer: b. 322.5 mL

Explanation:assume constant pressure, then

693/(273.15+45) = v/(273.15-125)

v= 693*148.15/318.15 = 322.7

By using Charles law, the volume will be 322.5 mL

What is Charle's law?

The volume of such an ideal gas is proportional to its absolute temperature at constant pressure, according to Charles' law.

According to Charles law.

[tex]T_{1} / T_{2} = V_{1} / V_{2}[/tex]

where, T is temperature and V is volume.

A substance or object's volume refers to the amount of 3D space it takes up.

Calculation of volume.

Given data:

V = 693 mL

[tex]T_{1}[/tex] =-125°C = (273-125) = 148 K

[tex]T_{2}[/tex] = 45° = (273+45) = 318 K

Put the value of given data in Charles law formula.

148 K/  318 K = V / 693 mL

V = 322.5 mL.

Therefore, by using Charles law the volume of a gas will be 322.5 mL.

To know more about Charles law.

https://brainly.com/question/16927784

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Answer:

the pressure is raised and the temperature is lowered

Explanation:

According to the ideal gas law, there is no interaction between the molecules of an ideal gas. This implies that the molecules of an ideal gas are largely separated from each other and move around at great velocities in the vessel.

However, when the pressure is raised, molecules come into closer proximity with each other, similarly, when the temperature is lowered, the average kinetic energy of gas molecules is also lowered and intermolecular interaction become significant under these conditions. Hence, the ideal gas law now become inaccurate.

Answer:

Explanation:

Iron Haber process  = (making ammonia)

Vanadium (V) oxide = Contact process (a stage in making sulfuric acid)

Manganese dioxide = Decomposition of hydrogen peroxide (produces water and oxygen)

Answer:

13.3 h

Explanation:

Step 1: Given data

Time (t): 48,000 seconds

Step 2: Convert "t" from seconds to minutes

We will use the conversion factor 1 min = 60 s.

48,000 s × 1 min/60 s = 800 min

Step 3: Convert "t" from minutes to hours

We will use the conversion factor 1 h = 60 min.

800 min × 1 h/60 min = 13.3 h

To sum up, 48,000 seconds is equal to 13.3 hours.

Answer:

10 Litre

Explanation:

Given that ::

v1 = 25L ; n1 = 1.5 mole ; v2 =? ; n2 = (1.5-0.9) = 0.6 mole

Using the relation :

(n2 * v1) / n1 = (n2 * v2) / n2

v2 = (n2 * v1) / n1

v2 = (0.6 mole * 25 Litre) / 1.5 mole

v2 = 15 / 1.5 litre

v2 = 10 Litre

Answer:

O-H bond

Explanation:

Let us work out the electronegativity difference between the elements in each bond in order to decide which of them is most polar.

For the C-O bond

2.55 - 2.2 =0.35

For the F-F bond

3.98 - 3.98 = 0

For the O-H bond

3.44 - 2.2 = 1.24

For the N-H bond

3.04 - 2.2 = 0.84

The O-H bond has the highest electronegativity difference, hence it is he most polar bond.