Burning hydrogen is an example of a chemical reaction. The reaction is
shown in the diagram. Which of the following sthtements about energy in
this reaction is the most accurate?

The molality of the CaCl₂ solution given that 166.5 g of CaCl₂ dissolves in 3.5 Kg of water is 0.429 M

This is the defines as the mole of solute per unit mass (in Kilogram) of water.

Molality = mole / mass of water (in Kg)

The mole of 166.5 g of CaCl₂ can be obtained as illustrated below:

Mole = mass / molar mass

Mole of CaCl₂ = 166.5 / 111

Mole of CaCl₂ = 1.5 moles

The molality of the CaCl₂ solution can be obtained as illustrated below:

Molality = mole / mass of water (in Kg)

Molality of CaCl₂ = 1.5 / 3.5

Molality of CaCl₂ = 0.429 M

Thus, the molality of the solution is 0.429 M

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An acid-base reaction involves the exchange of one or more hydrogen ions H+ which leads to the production of water and salt.

An acid–base reaction is a type of chemical reaction that involves the exchange of one or more hydrogen ions H+ means proton, between reactive species. For example, the hydrochloric acid (HCl) reacts with sodium hydroxide (NaOH) produces a solution of sodium chloride (NaCl) and water molecules.

The hydroxide ion is a negatively charged molecule that made up when hydrogen atom bonded to oxygen atom at 1:1 form. It acts as a base that forms ionic compounds when bonded to a positively charged ion molecule.

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The moles of CO2 are in the tank is mathematically given as

n=1.431

Question Parameters:

A 10-liter tank of CO2 is at a pressure of 3.5 atm and a temperature of

25°C.

Generally, the equation for the ideal gas  is mathematically given as

PV=nRT

Therefore

n=PV/RT

n=354.638kpa*10/8.314 J/mol·K *298k

n=1.431

In conclusion,  moles of CO2 is in the tank is

n=1.431

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Answer:

what do you need to know to decide whether this statement is correct?

Answer:

V = 9

Explanation:

n = 0.410

T = 47.0C (must be convert to K by + 273.15) = 320.15 K

P = 1.20 atm

R = 0.08205

V = ?

To solve this equation, we must follow the equation below:

PV = nRT

1.20 x V = 0.410 x 0.08205 x 320.15 K

1.20 x V = 10.8

V = 9

So the answer is 9.

The new pressure is 1.08 atm

From the question, we are to determine the new pressure

Using the General gas equation,

[tex]\frac{P_{1}V_{1} }{T_{1}} = \frac{P_{2}V_{2} }{T_{2}}[/tex]

Where

From the given information,

P₁ = 1.5 atm

V₁ = 15 L

T₁ = 105 C = 105 + 273.15 = 378.15 K

V₂ = 25 L

T₂ = 181 C = 181 + 273.15 = 454.15 K

P₂ = ?

Putting the parameters into the equation, we get

[tex]\frac{1.5 \times 15}{378.15} = \frac{P_{2} \times 25 }{454.15}[/tex]

[tex]P_{2}= \frac{1.5 \times 15 \times 454.15}{25 \times 378.15}[/tex]

P₂ = 1.08 atm

Hence, the new pressure is 1.08 atm

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Answer:

Concentration of this solution = 12g/60dm3

Concentration of this solution = 0.2g/dm3

Explanation:

Just use 12 ÷ by 60 as they want the simplify answer

Explanation:

carbon dioxide has a percent composition of 72.7% oxygen, i.e. for every 100 g of carbon dioxide you get 72.7 g of oxygen.

letter B

Explanation:

An entire, intact organism may be

preserved in amber and ice

Answer:

3. the symbol of each element in the substance

Explanation:

Answer:

Magma is not a factor responsible for the formation of sedimentary rock.

Explanation:

Answer:

D

Explanation:

according to newtons 3rd law action is accompanied by an equal reaction that is equal in magnitude but opposite in direction so magnitude of force should be same

If the force generated by the boat to push it forward is 24,000 N, force applied by the current is exactly 24,000 N. Therefore, the correct option is option D.

A force in physics is an effect that changes the velocity of a mass-moving object, causing it to accelerate from rest, for example. It is a vector quantity since it's capable of being a push or a pull and always has magnitude and direction. It is denoted by the letter F and is measured in newtons (N), the SI unit of force.

The net force that an object experiences is equivalent to the pace that its momentum varies over time, according to Newton's second law in its original formulation. This equation suggests that an object's acceleration seems inversely proportional to the total force that it experiences if the item's mass remains constant.  If the force generated by the boat to push it forward is 24,000 N, force applied by the current is exactly 24,000 N.

Therefore, the correct option is option D.

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Answer:

Baseball: PE

Satellite: KE

Sky Diver: KE

Basketball: PE

Arrow: KE

Cliff Diver: PE

Swinging Girl: PE

Grasshopper: PE

Bobsled: KE

Slingshot: PE

Explanation:

  For a thrown object, KE and PE are in a sort of equilibrium. As the object climbs towards its highest point, it slows down as the initial KE that initiated the movement runs out. At the highest point, it is out of kinetic energy and full of potential energy. Gravity then pulls on the object and causes it to accelerate, thus giving it more KE. The PE at the top of the arc is because at that point, the object has the potential to fall to earth. This is the reasoning behind the baseball, swinging girl, and grasshopper.

  This is, in a way, the same reasoning behind the other potential energy cases as well. The basketball, cliff diver, and slingshot are all about to start moving. The first two will be pulled by gravity and the last one will be propelled be the stretchy slingshot material attempting to snap back into place.

  All of the KE examples are due to the object or person actively moving towards or around something. This means that they have kinetic energy--the energy of movement!

Answer:

Baseball: Potential Energy

Satellite: Kinetic Energy

Sky Diver: Kinetic Energy

Basketball: Potential Energy

Arrow: Kinetic Energy

Cliff Diver: Potential Energy

Swinging Girl: Potential Energy

Grasshopper: Potential Energy

Bobsled: Kinetic Energy

Slingshot: Potential Energy

Explanation:

Answer: 22,000 C

Explanation:

Break the numbers apart to make them smaller then multiply and add them back to the big number and there is your answer

Answer:

The hottest known star, WR 102, is one such Wolf-Rayet, sporting a surface temperature more than 35 times hotter than the Sun.

If Liquid 1 has a higher specific heat than Liquid 2, then Liquid 1 will take longer to increase in temperature because the higher specific heat of a liquid needs more thermal energy for heating a liquid.

Specific heat of a substance refers to the quantity of heat that is required to raise the temperature of one gram of a substance by one Celsius degree so we can conclude that  Liquid 1 will take longer to increase in temperature

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Bothe calcium and radium are second group elements in periodic table with two valence electrons. They exhibit similar physical and chemical properties.

All the elements in periodic table are classified into different groups and periods. The horizontal rows in periodic table are called periods. From left to right in a period the atomic number increases.

The vertical columns in the periodic table are called groups. Down a group the number of shells increases thereby the atomic size also. A group contains elements with same number of valence electrons and similar physical and chemical properties.

Calcium and radium are in the second group of periodic table and they are called the alkaline earth metals. Both contains two valence electrons and they will participate in chemical bonding by losing these two electrons and thus are divalent cations.

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Answer: Your answer is, close to the freezing point, the water molecules start to arrange locally into ice-like structures. This creates some "openness" in the liquid water, which tends to decrease its density.

Hope this helps!

Answer:

Explanation:

Using Charles's Law to solve this question: V1/T1 = V2/T2

V1 = 2.24L

T1 = 52C (covert to Kelvin by plus 273.15) = 325.15K

V2 = 1.66L

T2 = ?

V1/T1 = V2/T2 must change to V2×T1/V1 = T2

1.66 x 325.15/2.24 = V2

V2 = 240.96K ≈ 241K

Answer:

there's no images we need pictures

Answer:

a-b and e-f

Explanation:

No change in distance during these periods as there is change in time.

Answer:

[tex]\huge\boxed{\sf\: e \: -\: f \:\: and \:\: a \: -\: b}[/tex]

Explanation:

The car is not moving / is at rest from section(s) e to f & a to b.

Here, from e to f & a to b, we can see in the distance-time graph that the car shows no motion & is present in the same direction even though the time changes. Hence, we can infer that the car is at rest.

If the line goes up then the speed increases, if it's moving down then the speed decreases & if the line is the same then the car is at rest.

[tex]\rule{150}{2}[/tex]

Answer:

C

Explanation:

I picked C because the plant is interacting with the sun which is a nonliving part of the environment.

A, B and D are wrong because seaweed, horses, and trees are living things.

Answer:

C) A plant bending towards the sunlight

Explanation:

A) is incorrect because both the lobster and the seaweed are organisms! Likewise, so are B) and D). D) might seem a little tricky, but ultimately the squirrel is interacting with the tree by living inside it.

A plant bending towards the sunlight, however, is an organism having a response to a factor in its environment.

Faster molecules have fewer collisions than slower molecules is True about molecular speed.

Molecular speed refers to the average distance gases or molecules travelled atca particular time rate.

It is valid in ideal gas, where the molecules do not interact with others.

Average molecular speed = Square root (3 (ideal gas constant) * (Temperature)/m)

Therefore, Faster molecules have fewer collisions than slower molecules is True about molecular speed.

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Answer:

mars is the most dense I believe

Answer:

A the outer planets Jupiter, Saturn, Uranus, Neptune

Explanation:

Answer:

A one mL per minute rate (or slower) is recommended for best results in a fractional distillation; simple can go faster. Slow, gradual distillation essentially allows the best equilibration and heat transfer. If you heat too fast, vapors may not condense as quickly as desired, and may waste some of the column.

Answer:the perpendicular force per unit area

pressure, in the physical sciences, the perpendicular force per unit area, or the stress at a point within a confined fluid.

Explanation:

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The standard cell notation for an Galvanic cell with aluminum and gold electrodes is Au(s)| Au³⁺  ||   Al³⁺| Al (s)

A device in which electrical energy is converted into chemical energy or chemical energy is converted into electric energy is called an Electrolytic cell

The electrolytic cell consists of two metallic electrodes and an electrolyte.

In this cell nomenclature, the electrode to the left of the salt bridge is always assumed to be the anode, and the accompanying half-equation is always stated as an oxidation , while right side is cathode and the half equation is Reduction.

Au(s) → Au³⁺(aq) + 3e⁻  ..........(oxidation)

Au³⁺(aq) + 3e⁻ →Au(s) ..............(reduction)

Therefore, The standard cell notation for an electrolytic cell with aluminum and gold electrodes Au(s)| Au³⁺  ||   Al³⁺| Al (s)

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Answer:

AI(s) I AI3+(aq) ii Au+(aq) I Au(s)

Explanation:

I just got it wrong

Answer:

2Cr

2H2

2NaCl

Explanation: