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Answer:

A. To increase enthalpy

Explanation:

Because the burner is the engine of the hot air balloon it is what propels the hot air up into the envelope to make the balloon rise

Answer:

3.06 g/L

Explanation:

Taking into account the definition of density and ideal gas law, the density of aluminum chloride vapor (AlCl₃) at 498 K and 0.939 atm is 3.06 g/L.

Density is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.

In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance. Then, the expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:

[tex]density=\frac{mass}{volume}[/tex]

Ideal gases are a simplification of real gases that is done to study them more easily. It is considered to be formed by point particles, do not interact with each other and move randomly. It is also considered that the molecules of an ideal gas, in themselves, do not occupy any volume.

An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of gases:

P×V = n×R×T

From the Ideal gas law, you can get that:

[tex]\frac{n}{V} =\frac{P}{RxT}[/tex]

On the other side, the molar mass of substance is a property defined as the amount of mass that a substance contains in one mole. It can be expressed as:

[tex]molar mass= \frac{mass}{number of moles}[/tex]

Then, the number of moles n can be calculated as:

[tex]n=\frac{mass}{molar mass}[/tex]

So:

[tex]\frac{\frac{mass}{molar mass} }{V} =\frac{P}{RxT}[/tex]

Solving you get the expression:

[tex]\frac{mass }{V} =\frac{Pxmolar mass}{RxT}[/tex]

Considering the definition of density, you finally get:

[tex]density=\frac{Pxmolar mass}{RxT}[/tex]

In this case, you know:

Replacing in the previous expression for the calculation of the density:

[tex]density=\frac{0.939 atmx133.35\frac{g}{mol} }{0.082\frac{atm L}{molK} x498 K}[/tex]

and solving you get:

density= 3.06 g/L

Finally, the density of aluminum chloride vapor (AlCl₃) at 498 K and 0.939 atm is 3.06 g/L.

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Color change, formation of a precipitate, formation of a gas, odor change, temperature change is the correct answer

What is Chemical Indicator ?

Chemical indicators are substances that change color in response to changes in a chemical environment, such as changes in pH, temperature, or the presence of certain ions. They are commonly used in a variety of applications, such as quality control in manufacturing, medical diagnostics, and laboratory research. There are many different types of chemical indicators, including pH indicators, which change color in response to changes in the acidity or alkalinity of a solution, and redox indicators, which change color in response to changes in the oxidation state of a substance.

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Answer:

they're all right

Explanation:

on edge

it will become a solution.hope this helps!

Answer:

Improving the habitats of herring thereby increasing their population.

Explanation:

First, two consumers (Steller sea lion and  Pollock) are both competing for common prey (herring). Since the question only asked what could be done to increase the decreasing Steller sea lion population of Alaska, the focus would be made only on the Steller sea lion.

The Steller sea lion population would increase if:

1. The herring population should be increased by improving the food available for them to feed on, and improving their reproduction capacities to enable them to reproduce efficiently.

2. Since there are 2 predators. If the population of the prey is fixed, then Pollock should be more hunted by farmers or other biological means to eliminate competition.

Answer:

2.7

Explanation:

This answer is not a whole number due to the fact that it is a decimal form.

A whole number would be 635, it would not be 63.5. Therefore this number is not whole.

Copper is unable to displace magnessium in a reaction so the copper sulfate solution was left for four minutes before adding the magnesium.

The electrochemical series shows the order of reactivity of the metals. The metals that are higher in the series can displace the metals that are lower in the series in a chemical reaction.

We know that copper is unable to displace magnessium in a reaction hence the reaction can not occur in the reverse direction. Hence, the copper sulfate solution was left for four minutes before adding the magnesium.

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Answer:

0.39 is the answer!

Answer:

i don't understand let us know which one you want us to answer

Answer:

D. The kinetic energy is greater after a substance changes from a

solid to a liquid

Explanation:

During a phase change from solid to liquid, the particles making up the mobile becomes more mobile and as a result there is an increase in kinetic energy of the system.

Answer:

D. The kinetic energy is greater after a substance changes from a solid to a liquid

Explanation:

Answer:

When it is more reactive according to the reactivity series.

Explanation:

Answer:

Recessive

Explanation:

Hope this help I think this is the right answer.

Answer:

5.25 lit

Explanation:

[tex]standard \: pressure = 1atm[/tex]

[tex] \frac{3.5lit}{1atm} = \frac{x}{1.5atm} [/tex]

[tex]x = 5.25lit[/tex]

Answer:

Most chemical weathering takes place only on the outer surface of a rock. Therefore, rocks with a lot of surface area weather faster than rocks with little surface area. However, if a rock has a large volume as well as a large surface area, it takes longer for the rock to wear down.

Explanation:

Answer:

This means that the metal is more properly viewed as an array of positive ions surrounded by a “sea of mobile valence electrons.” Electrons which are capable of moving freely throughout the empty orbitals of the metallic crystal are called delocalized electrons (Figure below).

TRUE. BECAUSE : When an atom gains electrons (which are negatively charge), the ion formed is negatively charged and is called an anion. If an atom loses electrons, the ion formed in positively charged and is called a cation.

The volume of stock solution they use to make the required solution is 6.94mL.

To calculate the value of required volume we will use the below equation:

M₁V₁ = M₂V₂, where

M₁ = molarity of stock solution = 18M

V₁ = volume of stock solution = to find?

M₂ = molarity of H₂SO₄ solution = 2.50M

V₂ = volume of H₂SO₄ solution = 50mL

On putting all these values on the above equation and calculate for the value of V₁ as:

V₁ = (2.50)(50) / (18)

V₁ = 6.94mL

Hence correct option is (3) i.e. 6.94mL.

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Answer:

C. 6.94 mL

Explanation:

Correct on Edge 2022!!!

Good luck everyone, you got this! Have a great day!

Explanation:

because they have more protons

Answer:

Organ

Explanation:

Cells work together to make tissues, tissues work together to make organs, organs works together to make the organ system, and the organ system works to help the organism stay alive and do all of the physical stuff._.

Benzene reacts with concentrated sulfuric acid to form benzene sulfonic acid .

The reaction attached

Answer:

See below ~

Explanation:

Answer:

Earthquakes occur on faults - strike-slip earthquakes occur on strike-slip faults, normal earthquakes occur on normal faults, and thrust earthquakes occur on thrust or reverse faults. I hope this helps you :)

Answer:

The way its parts are arranged

Explanation:

Answer:

Magnesium oxide

Explanation:

The substance which undergoes combustion is said to be combustible.It is called fuel. If a magnesium ribbon is heated,it starts burning. When a magnesium ribbon burns,it combines with the oxygen of air to form magnesium oxide,and liberates heat and light.

Answer:

a. CH4 → CO2 and H20

O2 → CO2 and H20

b. -890 kJ

Explanation:

Answer:

Transverse!

Explanation:

Transverse is a more direct moving wave

The wave which is generated by moving a spring toy up and down is transverse wave. An electromagnetic wave is a transverse wave. The correct option is C.

A transverse wave is a progressive wave. The direction of propagation of a transverse wave is always perpendicular to its direction of vibration. They are non-mechanical waves which do not need a medium for propagation and they consists of crests and troughs.

When a toy spring is moved up and down, the generating waves that propagate in the horizontal direction while disturbing the toy spring in the vertical direction. In physics transverse wave is considered as a moving wave where oscillations are perpendicular to the direction of the wave.

The transverse waves are found commonly in elastic solids, oscillations, etc. The waves generated by moving a spring toy up and down is transverse wave.

Thus the correct option is C.

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Answer:

DDT (dichloro-diphenyl-trichloroethane) was developed as the first of the modern synthetic insecticides in the 1940s. It was initially used with great effect to combat malaria, typhus, and the other insect-borne human diseases among both military and civilian populations.

Ozone is a naturally occurring molecule. An ozone molecule is made up of three oxygen atoms. It has the chemical formula O3.

Explanation:

It is commonly used as a fire extinguishing agent. The reason it has so much ozone depleting potential is because it contains bromine, which has many times the ozone depleting potential of chlorine.

Dalton's Atomic Theory explains many well-established scientific laws, including all of these except the law of Conservation of Mass. The correct option is A.

According to the second component of the theory, the mass, and characteristics of every atom in a specific element are the same. Compounds, according to the third section, are combinations of two or more different kinds of atoms.

Dalton's theory thus recognized that all matter is made up of atoms, which is accurate, but it did not recognize the presence of smaller particles within atoms, which is wrong.

Dalton's theory, which claimed that atoms could not interact with one another, is erroneous because compounds are created by the fusion of two or more different kinds of atoms.

Therefore, the correct option is A. Law of Conservation of Mass.

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