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Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

[tex]n = \frac{N}{L} \\ [/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

[tex]n = \frac{7.15 \times {10}^{24} }{6.02 \times {10}^{23} } \\ = 11.87707641...[/tex]

We have the final answer as

Hope this helps you

Answer:

potassium bromide can only conduct electricity when in an aqueous solution due to the electrostatic force between the ionic bonds

The potassium bromide can conduct electricity when melted or dissolved in water. Therefore, option (B) is correct.

The crystalline solids which are formed by closely packed ions of opposite charge are called ionic compounds. In ionic compounds, the ions are connected with each other by ionic bonds in solis state.

The elements which can gain or lose electrons to attain their nearest noble gas configuration participate in the formation of ionic compounds. The solid ionic compound cannot able to conduct electricity.

In the melted state, the ions of K⁺ and Br⁻ can move from their fixed positions. Therefore, the KBr can conduct electricity when melted or dissolved in water.

The ionic compounds are able to conduct electricity in melted or dissolved in water. Because only in these states the ins can move freely while in the crystalline state the ions cannot move freely to conduct electricity.

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Answer:

7.208 g

Explanation:

0.4mol x [tex]\frac{2(1.01) + 16.00 g}{1 mol}[/tex]

= 7.208 g

You are using molar mass of H20 to find the mass. Moles of 0.4 and 1 mol cancel out leaving you with just grams. You get the values in the numerator from the periodic table and the 2(1.01) is because you have 2 of the H in H20

Answer: One change of state happens when you add energy to the substance. This change of state is called melting. By adding energy to the molecules in a solid the molecules begin to move quicker and can break away from the other molecules.

Explanation: I hoped that helped!

Answer:

The ocean holds about 97 percent of the Earth's water; the remaining three percent is found in glaciers and ice, below the ground, in rivers and lakes. Of the world's total water supply of about 332 million cubic miles of water, about 97 percent is found in the ocean.

wait..if you asking about the country it's Brazil✌️

Answer:

It would decrease

Explanation:

In an ecosystem, organisms feed on one another for survival due to the fact that energy needed for metabolic activities in individual organisms can only be obtained via food. This question depicts that certain bird population feeds on barley plant in an ecosystem.

However, If a disease attacks the plants in such a way that it destroys the barley plants in the field, this would cause the barley-eating bird population to DECREASE because their food source has been affected.

Answer:

the barley-eating bird population in the field would decrease.

Explanation:

if I am correct I think its I'm am not 100 percent sure but I think this should be the answer

The gravitational force of attraction between them is 3.56 * 10⁻⁴ N

Using the formula of gravitational attraction

F = G*M1M2/d²

where G = 6.67 * 10⁻¹¹ Nm²Kg⁻²

M1 = 8000Kg

M2 = 1500 Kg

F =  6.67 * 10⁻¹¹ * 8000 * 1500 / (1.5)²

F = 3.56 * 10⁻⁴ N

The gravitational force of attraction between them is 3.56 * 10⁻⁴ N

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Volume of Argon = 59.972 L

In general, the gas equation can be written  

[tex]\large {\boxed {\bold {PV = nRT}}}[/tex]

where  

P = pressure, atm  

V = volume, liter  

n = number of moles  

R = gas constant = 0.08206 L.atm / mol K  

T = temperature, Kelvin  

At STP(0 C, 1 atm), 1 mol gas= 22.4 L

so for 20 L

[tex]\tt \dfrac{20}{22.4}=0.893[/tex]

For Argon

P = 1 atm

T = 273 K x 3 =819 K (tripled)

n = 0.893 (the same number of moles)

R = 0.082 L/atm.mol K

[tex]\tt V=\dfrac{nRT}{P}=\dfrac{0.893\times 0.082\times 819}{1}=59.972~L[/tex]

Answer is B-  He can arrange the beads into various formations using different colors and sizes multiple times

Explanation: I hope the helped!

Peter can arrange the beads into various formations using different colors and sizes multiple times.

The periodic table, also known as the periodic table of the elements, is a tabular display of the chemical elements. It is widely used in chemistry, physics, and other sciences, and is generally seen as an icon of chemistry.

In order to show how compounds form in nature, the beads will be assigned to the different elements on the periodic table according to the following arrangements;

With the above arrangements, it will be possible to show the affinity and proportion of the elements in the compound formed in nature.

Therefore, Peter can arrange the beads into various formations using different colors and sizes multiple times.

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Answer:

Electrons - 20

protons - 22

neutrons - 26

Explanation:

Titanium has an atomic number of 22 indicating that the neutral atom has 22 protons.

Ti 2+ has lost two electrons and contains only 20 electrons, 22 protons.

The mass number of titanium is 48. Hence;

Mass number = atomic number + number of neutrons

Since the atomic number is 22 and the mass number is 48

number of neutrons = 48 - 22 = 26 neutrons

Answer:0,25 g/cm3 creo

Explanation:densidad es masa entre volumen

Answer:

0.25 g/cm³

Step-by-step explanation:

As we know

The density is given by

Density = Mass / Volume

Putting the values

Density = 5g / 20 cm³

Density = 0.25 g/cm³

Sorry if wrong I'm not great at math!

Answer:

P₂ = 0.99 atm

Explanation:

Given data:

Initial pressure = 1.02 atm

Initial temperature = 11.2°C

Final pressure = ?

Final temperature = 4.00°C

Solution:

Initial temperature = 11.2°C (11.2+273 = 284.2 K)

Final temperature = 4.00°C (4.00+273 = 277 K)

According to Gay-Lussac Law,

The pressure of given amount of a gas is directly proportional to its temperature at constant volume and number of moles.

Mathematical relationship:

P₁/T₁ = P₂/T₂

Now we will put the values in formula:

1.02 atm / 284.2 K = P₂/277 K

P₂ = 1.02 atm × 277 K / 284.2 K

P₂ = 282.54 atm. K /293 K

P₂ = 0.99 atm

Answer:

230,294.9 I think it's fine just try your past or ask teacher help

Answer:

18 mol NH₃

General Formulas and Concepts:

Chemistry - Stoichiometry

Explanation:

Step 1: Define

RxN:   N₂ (g) + 3H₂ (g) → 2NH₃ (g)

Given:   27 moles H₂

Step 2: Stoichiometry

[tex]27 \ mol \ H_2(\frac{2 \ mol \ NH_3}{3 \ mol \ H_2} )[/tex] = 18 mol NH₃

Step 3: Check

We are given 2 sig figs.

Since our final answer is in 2 sig figs, we do not need to round.

Answer:

yes, because evidence from scientifically research studies, is important because it lets us make decisions based on what works with studies of science we can know if this is right or not  

Explanation:

Hope i helped~  

Answer:

2.67 moles of cesium carbonate (Cs2CO3).

Explanation:

We'll begin by writing the equation for the reaction. This is illustrated below:

Cs + Fe2(CO3)3 —> Cs2CO3 + Fe

The above equation can be balance as follow:

There are 2 atoms of Fe on the left side and 1 atom on the right side. It can be balance by putting 2 in front of Fe as shown below:

Cs + Fe2(CO3)3 —> Cs2CO3 + 2Fe

There are 3 atoms of C on the left side and 1 atom on the right side. It can be balance by 3 in front of Cs2CO3 as shown below:

Cs + Fe2(CO3)3 —> 3Cs2CO3 + 2Fe

There are 6 atoms of Cs on the right side and 1 atom on the left. It can be balance by putting 6 in front of Cs as shown below:

6Cs + Fe2(CO3)3 —> 3Cs2CO3 + 2Fe

Thus, the equation is balanced.

From the balanced equation above,

6 moles of Cs reacted with 1 mole of Fe2(CO3)3 to produce 3 moles of Cs2CO3.

Finally, we shall determine the moles of cesium carbonate (Cs2CO3) produced by the reaction of 5.34 moles of cesium (Cs). This can be obtained as follow:

From the balanced equation above,

6 moles of Cs reacted to produce 3 moles of Cs2CO3.

Therefore,

5.34 moles of Cs will react to produce = (5.34 × 3)/6 = 2.67 moles of Cs2CO3.

Thus, 2.67 moles of cesium carbonate (Cs2CO3) were produced from the reaction.

1. Q=112.8 kJ

2. Q=5.01 kJ

The heat required for phase change :

Q = mLf

Lf=latent heat of fusion

Q = mLv

Lv=latent heat of vaporization

1.

m=50 g=0.05 kg

Lv (water) = 2256 kJ/kg

[tex]\tt Q=0.05\times 2256=112.8~kJ[/tex]

2.

m=15 g=0.015 kg

Lf for water = 334 kj/kg

[tex]\tt Q=0.015\times 334=5.01~kJ[/tex]

Explanation:

electrons move arround nucleus in the orbit such as sun in suria system..

The car acceleration form 0 to 1 will be 20 mph/s.

The rate at which an object's velocity changes with respect to time is called acceleration. Accelerations are measured in terms of vectors. The orientation of the force is acting on an item determines the orientation of its acceleration. Acceleration can be calculated by using this formula:

a = v-u/ΔT.

where, a = acceleration, v = final velocity, u = initial velocity and T is temperature.

Calculation of acceleration.

It is given that v = 20 , u = 0,

ΔT can be calculated as,

[tex]=T_{2} - T_{1} \\= 2-1\\ = 1[/tex]

Now , put the values given data in acceleration formula

a = 20-0/ 1

= 20 mph/ s.

Therefore, acceleration of car will be 20 mph/s.

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Electronegativity across a period: increases.

Electronegativity down a group: decreases.

Explanation:

Just did on Edge 2021

Electronegativity across a period increases and Electronegativity down a group decreases.

Electronegativity, symbolized as χ, is the tendency for an atom of a given chemical element to attract shared electrons when forming a chemical bond.

An atom's electronegativity is affected by both its atomic number and the distance at which its valence electrons reside from the charged nucleus.

On the periodic table, electronegativity generally increases as we move from left to right across a period and decreases as you move down a group.

As a result, the most electronegative elements are found on the top right of the periodic table, while the least electronegative elements are found on the bottom left.

Hence, Electronegativity across a period increases and Electronegativity down a group decreases.

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Answer:

up down up down thats the pattern

Explanation:

Answer:

10 g

Explanation:

The heating of copper can be represented by the following equation:

Cu + 1/2O2 ----> CuO

The new substance is copper oxide, CuO.

From the law of conservation of matter which says that matter can neither be created nor destroyed but be converted from one form to another, it means that barring any loss during heating, all the Cu should be converted to CuO. Hence, the amount of copper in the new substance should remain 10 g.

Answer:

;l ok

Explanation:

Answer:

car is in the driveway

water is flowing in the river

a man is. walking in the road

a bird is flying in the sky

a tiger is running in the jungle

a tiger is running to eat a breakfast

Answer:

4.9

Explanation:

Given data:

Mass of object = 67.4 ounce

Volume = 13.8 cup

Density = ?

Solution:

d = m/v

d = 67.4 ounce/13.8 cup

d = 4.9 oz/cup

Thus, density of object is  4.9 oz/cup.

Answer:

P₂ = 1000 atm

Explanation:

Given data:

Initial volume of air = 200 L

Initial pressure = 100 atm

Final volume = 20.0 L

Final pressure required = ?

Solution:

The given problem will be solved through the Boly's law,

Mathematical expression:

P₁V₁ = P₂V₂

P₁ = Initial pressure

V₁ = initial volume

P₂ = final pressure

V₂ = final volume  

Now we will put the values in formula,

P₁V₁ = P₂V₂

100 atm × 200 L= P₂  × 20.0 L

P₂ = 20,000 atm. L/ 20.0 L

P₂ = 1000 atm

Answer:

by Judith Curry On what we can learn from Goldilocks and The Three Bears ... In planetary science, the 'Goldilocks zone' is terminology for the the band ... We all know the fairy tale story of “Goldilocks and the three bears”, where GL ... as the discovery that the Earth was not the center of the solar system.

Explanation: