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Answer:

1. Exothermic reaction

2. Is being released

3. The energy comes from the change in energy between reactants and products

Explanation:

The reaction is producing energy. A reaction that produce energy is called a Exothermic reaction.

As the energy is produced, the energy is being released.

As you can see in the image, the energy of the reactants is higher than the energy of the products. This change of energy in the chemicals produce the production of energy as heat.

Answer:

H₂O₂

Explanation:

The molecular formula gives the exact number of atoms within a chemical compound.

In this problem:

Mass of O  = 32g

Mass of H = 2g

  Let us follow this methodical approach to solve the problem:

Elements                                  O                                       H

Mass                                         32                                      2

Molar mass                               16                                       1

Number of moles                  32/16                                     2/1        

                                                  2                                         2

The molecular formula of the compound is H₂O₂                

Explanation:

Juno's primary goal is to reveal the story of Jupiter's formation and evolution. Using long-proven technologies on a spinning spacecraft placed in an elliptical polar orbit, Juno will observe Jupiter's gravity and magnetic fields, atmospheric dynamics and composition, and evolution.

Answer:

Jupiter.

Explanation:

One mole of carbon atoms has a mass of exactly 12 g. Because magnesium atoms each have twice the mass of carbon atoms (24Mg compared with 12C), one mole of magnesium has a mass of 24 g. In fact, one mole of any element has a mass in grams that is equal to its relative atomic mass. One mole of iron has a mass of 56 g

64 g O₂

Math

Pre-Algebra

Order of Operations: BPEMDAS

Chemistry

Atomic Structure

Stoichiometry

Step 1: Define

[RxN - Balanced]   CH₄ + 2O₂ → CO₂ + 2H₂O

[Given]   36 g H₂O

[Solve]   x g O₂

Step 2: Identify Conversions

[RxN] 2 mol O₂ → 2 mol H₂O

[PT] Molar Mass of O - 16.00 g/mol

[PT] Molar Mas of H - 1.01 g/mol

Molar Mass of O₂ - 2(16.00) = 32.00 g/mol

Molar Mass of H₂O - 2(1.01) + 16.00 = 18.02 g/mol

Step 3: Stoichiometry

Step 4: Check

Follow sig fig rules and round. We are given 2 sig figs.

63.929 g O₂ ≈ 64 g O₂

Mass of O₂ needed = 64 g

Given

Reaction

CH₄ + 2O₂ → CO₂ + 2H₂O

36 grams of H₂O

Required

Mass of O₂ needed

Solution

mol H₂O :

= mass : MW H₂O

= 36 : 18 g/mol

= 2

From the equation, mol ratio of O₂ : H₂O = 2 : 2, so mol O₂=2

Mass O₂ :

= mol x MW O₂

= 2 x 32 g/mol

= 64 g

Answer:

its unbalanced  

have a great day/night

Explanation:

please mark brainlest

Answer:

C. I (iodine)

Explanation:

it would be Iodine because it has 5 energy levels of electrons and has a total of 74 neutrons inside its nucleus!

Hope this helps, have a good day!

Answer:

true?

Explanation:

When a moving ball collides with a stationary ball then the forces act in action and reaction pairs according to Newton's 3rd law. Therefore, the given statement is true.

According to Newton's third law of motion, when two objects interact, they exert force on each other, and these forces are called action and reaction pairs.

Force can be defined as a push or pull acting on a body resulting in its interaction with another body. Force can be defined as a result of an interaction and is classified into two categories: contact force and non-contact force.

Newton’s third law of motion states that when the first object exerts a force on the second object, the first object experiences a force with the same magnitude in the opposite direction of the exerted force.

When a moving ball collides with a stationary ball as the moving ball collides it exerts a force on the stationary ball in reaction the stationary ball exerts an equal force on the moving ball but in opposite direction.

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Answer:

Number of moles = 1.5 mol

Explanation:

Given data:

Number of moles = ?

Mass in gram = 3 g

Solution:

Formula:

Number of moles = mass/molar mass

Molar mass of hydrogen gas = 2.02 g/mol

By putting values,

Number of moles = 3 g / 2.02 g/mol

Number of moles = 1.5 mol

Answer:

Gadolinium (Gd).......

Answer:

Mass = 19.53 g

Explanation:

Given data:

Number of atoms of iron = 2.10 ×10²³ atoms

Mass of iron = ?

Solution:

The number 6.022 ×10²³ is called Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

1 mole contain 6.022 ×10²³ atoms

2.10 × 10²³ atoms ×  1 mol / 6.022 ×10²³ atoms

0.35 mol

Mass of iron atoms:

Mass = Number of moles × molar mass

Mass = 0.35 mol × 55.8 g/mol

Mass = 19.53 g

Answer

Fe2O3+3CO→2Fe+3CO2.

Explanation:

Answer:

Percent yield = 88.23%

Explanation:

Given data:

Percent yield of ammonia = ?

Actual yield = 15 g

Mass of nitrogen = 14 g

Solution:

Chemical equation:

N₂ + 3H₂      →     2NH₃

Number of moles of nitrogen:

Number of moles = mass/molar mass

Number of moles = 14 g/ 28 g/mol

Number of moles = 0.5 mol

Now we will compare the moles of ammonia and nitrogen.

         N₂          :         NH₃

          1            :         2

         0.5        :        2/1×0.5 = 1 mol

Mass of ammonia/Theoretical yield

Mass = number of moles × molar mass

Mass = 1 mol × 17 g/mol

Mass = 17 g

Percent yield:

Percent yield = ( actual yield / theoretical yield )× 100

Percent yield =  (15 g/ 17 g)× 100

Percent yield = 88.23%

Answer:

true

Explanation:

Answer:

True the wind causes waves in the ocean

Explanation:

Answer:

Explanation:

this is what the Lewis electron-dot diagram of a Cl2 molecule looks like

Lewis electron  diagram of a chlorine molecule is attached in the picture below.

Lewis dot structures are also called as electron dot structures and can be drawn if the molecular formula of a compound is known. It provides information regarding the nature of bond and the position of atoms .

They are also capable of exhibiting the lone pair if any present in a molecule or compound.Lewis defined a base to be an electron pair donor and an acid to be an electron pair acceptor.

They are capable of reflecting electronic structure of elements and even the pairing of electrons . In the diagram, each dot represents an electron while a pair of dots represent a bond between the atoms.They are useful in predicting the structure.

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Answer:

C

Explanation:

Answer:

The answer is C

Explanation:

The older elephants are surrounding the calf to protect it and make sure it lives to reproduce.

Answer:

The urinary system's function is to filter blood and create urine as a waste by-product. The organs of the urinary system include the kidneys, renal pelvis, ureters, bladder and urethra.

Explanation:

Answer:

I guess one mole. of mercury

Explanation:

because mercury is denser

The one that has the  greatest mass

To determine which of the given options has the greatest mass, we need to compare the molar masses of the substances.

The molar mass is the mass of one mole of a substance and is expressed in grams per mole (g/mol).

The molar masses of the given substances are:

Gold (Au): 197.0 g/mol

Mercury (Hg): 200.6 g/mol

Barium (Ba): 137.3 g/mol

Comparing the molar masses, we can see that one mole of mercury (Hg) has the greatest mass among the options provided.

Therefore, the correct answer is:

c. One mole of mercury.

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Answer: c)4, 7, 2, 4

Explanation:

According to the law of conservation of mass, mass can neither be created nor be destroyed. Thus the mass of products formed must be equal to the mass of reactants taken.

In order to get the same mass on both sides, the atoms of each element must be balanced on both sides of the chemical equation.

The balanced chemical equation will be :

[tex]4FeS+7O_2\rightarrow 2Fe_2O_3+4SO_2[/tex]

The coefficients when the chemical equation below is balanced are 4, 7, 2, 4

Answer:

mole=wt/M.wt

M.wBaH2→139.34g/mol

4.80=wt/139.34

wt=4.80×139.34

wt=668.8

wt≈669✓

According to mole concept, the mass of 4.80 mole of barium hydride is 669 g.

Mole is defined as the unit of amount of substance . It is the quantity measure of amount of substance of how many elementary particles are present in a given substance.

It is defined as exactly 6.022×10²³ elementary entities. The elementary entity can be a molecule, atom ion depending on the type of substance. Amount of elementary entities in a mole is called as Avogadro's number.

It is widely used in chemistry as a suitable way for expressing amounts of reactants and products.For the practical purposes, mass of one mole of compound in grams is approximately equal to mass of one molecule of compound measured in Daltons. Molar mass has units of gram per mole . In case of molecules, where molar mass  in grams present in one mole  of atoms is its atomic mass.

Number of moles is calculated as, mass/molar mass ,therefore on substitution mass=number of moles×molar mass

mass= 4.80×139.34=668.83 ≈669 g.

Therefore, the mass  of 4.80 mole of barium hydride is 669 g.

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Given that,

Four wooden blocks with masses of 2 kg, 5 kg, 7 kg, and 9 kg are placed on a table.

To find,

The block will have the least inertia.

Solution,

Inertia is the measure of mass of a body. It is directly proportional to the mass of the body.

The body having more mass will have more inertia. Out of four masses 9 kg block will have more inertia and 2 kg block will have least inertia.

Hence, the correct option is (a) " The block with a mass of 2 kg "

The wooden block of mass 2kg will have the least inertia.

The inertia of an object is defined as the property due to which an object continues in the existing state of rest or uniform motion in a straight line unless an external force is applied.

The inertia of an object is directly proportional to the mass of the object. Havier the object, it will be more resistant to any change in its state of motion or rest.

if we consider the same amount of force applied to all the wooden blocks of masses 2kg, 5kg, 7kg, and 9kg, it will be easiest to move the 2kg block and hardest to move the 9 kg block.

So, the block of mass 2kg has the least inertia while the block of mass 9kg has the maximum inertia among the given blocks.

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Answer:

c is correct answer my girl f

Answer:

When bethany walks across a carpet, her socks pick up many electric charges. Later in the day, these charges are no longer present on her socks. What most likely happened to the charges.

A. the charges disappeared.

B. The charges switched signs

C. the charges transferred to another object ✓

D. The charges broke apart into smaller particles

Answer:

164moles

Explanation:

Given parameters:

Number of molecules of CO₂   = 9.86 x 10²⁵molecules

Unknown:

Number of moles  = ?

Solution:

To solve this problem, a mole of any substance contains the Avogadro's number of particles.

In that;

        6.02 x 10²³ molecules makes up 1 mole of a substance

        9.86 x 10²⁵molecules   contains [tex]\frac{9.86 x 10^{25} }{6.02 x 10^{23} }[/tex]   = 1.64 x 10²moles

The number of moles is 164moles

Answer:

bbbbnnnnnnnnnnnnnnn

Explanation:

Answer:

4.1m/s

Explanation:

6.5min=6×60+30=390s

v=1600÷390=4.1m/s

John is running the 1600-meter race at his school's track meet. He runs the full 1600 meters in 6.5 minutes, then his average speed of John would be 4.1 meters per second.

The total distance covered by any object per unit of time is known as speed. It depends only on the magnitude of the moving object.

As given in the problem, John is running the 1600-meter race at his school's track meet. He runs the full 1600 meters in 6.5 minutes,

The distance covered by the John = 1600 meters

The time taken by the John = 6.5 minutes

                                                 =6.5×60

                                                  =390 seconds

The speed of the John = 1600/390

                                      = 4.1 meters per second

Thus,the speed of the John n meters/second rounded to the nearest tenth would be  4.1 meters per second.

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Answer: bases

Explanation:

Answer:

V = 42.6 L

Explanation:

Given data:

Number of moles of Cl₂ = 1.9 mol

Temperature and pressure = standard

Volume occupy = ?

Solution:

The given problem will be solve by using general gas equation,

PV = nRT

P= Pressure

V = volume

n = number of moles

R = general gas constant = 0.0821 atm.L/ mol.K  

T = temperature in kelvin

By putting values,

1 atm ×  V = 1.9 mol ×0.0821 atm.L /mol.K × 273.15 k

V = 42.6  atm.L / 1 atm

V = 42.6 L