Help please she need evidence!!!!!!???

Answer:

1.46 mol

Explanation:

Given data:

Moles of bromine gas produced = ?

Mass of potassium bromide = 347.5 g

Solution:

Chemical equation:

2KBr  +  F₂   →  2KF + Br₂

Number of moles of KBr:

Number of moles = mass/ molar mass

Number of moles = 347.5 g/ 119.0 g/mol

Number of moles = 2.92 mol

Now we will compare the moles of KBr and bromine.

                  KBr       :     Br₂

                    2         :      1

                   2.92    :       1/2×2.92 = 1.46 mol

Answer:

e is right ▶️▶️▶️▶️▶️▶️▶️

Answer:

7. 5km/h

8. 10km/h

I just need to add characters so i can post

Answer:

The cell membrane's main trait is its selective permeability, which means that it allows some substances to cross it easily, but not others. Small molecules that are nonpolar (have no charge) can cross the membrane easily through diffusion, but ions (charged molecules) and larger molecules typically cannot. A concentration gradient is a just a region of space over which the concentration of a substance changes, and substances will naturally move down their gradients, from an area of higher to an area of lower concentration.

In cells, some molecules can move down their concentration gradients by crossing the lipid portion of the membrane directly, while others must pass through membrane proteins in a process called facilitated diffusion.

Explanation:

there are your two reasons molecules cannot pass easily through the cell membrane and what part of the cell membrane helps them get through is concentration gradient

Answer:

2AlF₃ + 3Li₂O —> Al₂O₃ + 6LiF

Explanation:

AlF₃ + Li₂O —> Al₂O₃ + LiF

The above equation can be balanced as follow:

AlF₃ + Li₂O —> Al₂O₃ + LiF

There are 2 atoms of Al on the right side and 1 atom on the left side. It can be balance by writing 2 before AlF₃ as shown below:

2AlF₃ + Li₂O —> Al₂O₃ + LiF

There are 6 atoms of F on the left side and 1 atom on the right side. It can be balance by writing 6 before LiF as shown below:

2AlF₃ + Li₂O —> Al₂O₃ + 6LiF

There are 2 atoms of Li on the left side and 6 atoms on the right side. It can be balance by writing 3 before Li₂O as shown below:

2AlF₃ + 3Li₂O —> Al₂O₃ + 6LiF

Thus, the equation is balanced..!

Answer: [tex]Rb_2S[/tex] < [tex]K_2S[/tex] < [tex]Li_2S[/tex]

Explanation:

Lattice energy is the energy required to dissociate 1 mole of the an ionic compound into its constituent ions.

Thus higher is the lattice energy more energy will be required to melt the compounds.

As [tex]Li_2S[/tex]  has highest melting point,  it will require most energy to melt an hence it will have highest lattice energy. The order of three compounds in order of increasing lattice energy

[tex]Rb_2S[/tex] < [tex]K_2S[/tex] < [tex]Li_2S[/tex]

MgSO₄•8H₂O

Magnesium sulfate octahydrate

Given

7.820 g of Magnesium sulfate (MgSO₄ • xH₂O)

3.547 g of anhydrous magnesium sulfate

Required

The formula

Solution

Mass of H₂O :

= 7.820 g - 3.547 g

= 4.273 g

MW MgSO₄=120 g/mol

MW H₂O = 18 g/mol

Mol ratio MgSO₄ : H₂O

= 3.547/120 g/mol : 4.273/18

= 0.0295 : 0.2374

= 1 : 8

The formula :

MgSO₄•8H₂O

Magnesium sulfate octahydrate

Answer:

im 14 years old.

Explanation:

Answer:

b. heat energy

Explanation:

The domino at the end of the row move should be heat energy.

Heat energy refers to the energy where it leads to the small particles movement. It can be treated as the atoms, molecules, etc. Also, the one object to other object should be shifted in this. Since the student placed one hundred dominoes upright in a row so here the heat energy should be used.

Learn more about energy here; https://brainly.com/question/17172186

Answer:

almonds and sesame oil have the same amount of fat.

Explanation:

Almonds: 14 g

Butter: 12 g

Sesame Oil: 14 g

The molarity of a Sodium carbonate solution : 0.373 M

Given

32.52 g Na₂CO₃

822 ml of solution = 0.822 L

Required

The molarity

Solution

Molarity shows the number of moles of solute in every 1 liter of solution.

[tex]\large{\boxed {\bold {M ~ = ~ \frac {n} {V}}}[/tex]

mol of solute = mol of Na₂CO₃ :

= mass : MW Na₂CO₃

= 32.52 g : 106 g/mol

= 0.307

Molarity :

= n : V

= 0.307 mol : 0.822 L

= 0.373 M

Answer:

The answer is C. A single replacement reaction.

Explanation:

I did quiz.

The reaction is represented by Fe + CuSO4 → Cu + FeSO4 is single-replacement reaction . option C is correct.

A single-replacement reaction sometimes is called single displacement reaction into which a single compound as gets attached to the other compound after the completion of the reaction and we get it as a product.

Examples are Zn + 2HCL will give ZnCl + H2 gas but the condition is that the elements which are replacing must be of same in nature otherwise they will not get replace by any of them.

Therefore, reaction is represented by Fe + CuSO4 → Cu + FeSO4 is single-replacement reaction . option C is correct.

Learn more about single replacement reaction, here:

https://brainly.com/question/8625202

#SPJ2

Answer:

Mass =  44.2 g  

Explanation:

Given data:

Mass of nitrogen reacted = 36.2 g

Mass of ammonia formed =?

Solution:

Chemical equation:

N₂ + 3H₂    →    2NH₃

Number of moles of nitrogen:

Number of moles = mass/molar mass

Number of moles = 36.2 g / 28 g/mol

Number of moles = 1.3 mol

Now we will compare the moles of nitrogen and ammonia from balanced chemical equation to determine how many moles of ammonia re formed.

                        N₂         :         NH₃

                        1            :          2

                       1.3          :         2/1×1.3 = 2.6 mol

Mass of ammonia:

Mass = number of moles × molar mass

Mass = 2.6 mol × 17 g/mol

Mass =  44.2 g  

Answer:

The log will float on the water because its density is lower than the liquid, so it will stay at the top due to Archimedes' principle.

Answer:

B: It will float.

Explanation:

on edge2021! hope this helps!!~ (=^▽^=)

Answer:

2. Periods

Explanation:

The elements are arranged in seven horizontal rows, called periods or series, and 18 vertical columns, called groups. ... Elements in the periodic table are organized according to their properties.

Answer:

B

Explanation: hoped this helped!!!

Answer:

it is c no cap

Explanation: C

For your question about diagram it is definitely A

Answer:

A

Explanation:

Answer:

A solution is consist of solute and solvent and they both together determine the properties of complete solution. It is important to know the properties of both solute and solvent because they both depend on each other to meet a certain need, for example: the intermolecular forces between solutes and solvents determine the solubility of solute in solvent and if solutes must be completely dissolved in the solvent for a homogenous mixture.

The combination of solute and solvent to form a solution is a physical process and not a chemical one because it des not change the chemical properties of solute and solvents.

Answer:

........................................

I'm pretty sure we have the same class (I go to FL), because I have the same problem, and it was assigned the day you posted this, so I can't give a full answer but important things would be conducting electricity, solubility, flexibility, shape, and geometries. Sorry I can't be of more help!

Answer:

Empirical formula is C₃H₄O

Explanation:

Empirical formula:

It is the simplest formula gives the ratio of atoms of different elements in small whole number .

Given data:

Percentage of hydrogen = 7.14%

Percentage of carbon = 64.3%

Percentage of oxygen = 28.6%

Empirical formula = ?

Solution:

Number of gram atoms of H = 7.14 / 1.01 = 7.1

Number of gram atoms of O = 28.6 / 16 = 1.8

Number of gram atoms of C = 64.3 / 12 = 5.4

Atomic ratio:

            C                  :         H            :         O

         5.4/1.8             :      7.1/1.8       :       1.8/1.8

            3                   :        4            :        1

C : H : O = 3 : 4 : 1

Empirical formula is C₃H₄O.

Answer:

The Solar System moves through the galaxy with about a 60° angle between the galactic plane and the planetary orbital plane. The Sun appears to move up-and-down and in-and-out with respect to the rest of the galaxy as it revolves around the Milky Way

Explanation:

Hope you like it

Answer:

+1

The oxidation state of H+ = +1. The Oxidation state of Zn2+ = +2. The oxidation state of H2 = 0. The sum is equal to zero because there are 2 H+ ions.

Explanation:

Fertilizers supplement the soil with macronutrients needed in large amounts: nitrogen, phosphorous and potassium. ... Inorganic fertilizer, also referred to as synthetic fertilizer, is manufactured artificially and contains minerals or synthetic chemicals. so no

Explanation:

D. Atoms form millions of molecules. :)

Answer:

As I guess ans to yr question is D. Atoms from millions of molecules.

Since water does not have charged particles, water is a non-conductor. When some solutes dissolve in water they allow an electric current to flow through the water and the solution conducts electricity. These solutes are called electrolytes. ... Non-electrolytes like sugar dissolve to form molecules in solution.

Answer:

Because according to VSEPR theory lone pair occupies more space than bond pair.

Explanation:

Lone pair of electrons repels from bonded pair of electrons than that between bond pair of electrons itself. Hence, molecules attain a geometry in which the repulsive force is minimum.

The lone pair of electrons are pair of electrons which are not involved in bonding in any occasion but can be donated through coordinate bonds in some compounds.

Oxygen, nitrogen  etc. contains lone pair of electrons. According to VSEPR theory, the lone pair -lone pair repulsion > lone pair -bond pair > bond pair-bond pair repulsion.

Therefore, these electron pairs are aligned around the central atom in such a way that the repulsive force between the electron clouds are minimized.

For example, if consider hybridization of water molecule, it must acquire a tetrahedral  shape, but the lone pairs will align axial  and will assume a bent shape.

Find more on molecular geometry:

https://brainly.com/question/7558603

#SPJ2