Firefighters advise that you get out of a burning building by keeping close to the floor. We learned that carbon dioxide and most other hazardous compounds are more dense than air and they should settle to the floor. What other facts do we know that make the fire fighter's advise correct?

Answer:

Explanation:

The number of formula units can be found by using the formula

N = n × L

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

N = 0.002 × 6.02 × 10²³

We have the final answer as

Hope this helps you

Answer:

240g

Explanation:

Using the equation m=pV, where m=mass, p=density, and V=Volume

m=(6)(40)=240

m=240

Answer:

15.5 gm

Explanation:

What is the mass of phosphorus that contains twice the number of atoms found in 14 g of iron?

[Relative atomic mass : P = 31; Fe = 56]

14 gm Fe = 14gm/ 56 gm/mole = 14 mole gm/56gm = 14/56 mole

0.25 moles

2 X 0.25 = 0.5 moles

1 mole P = 31 gm

so

0.5 moles P =31/2 =15.5 gm

Answer:

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Answer:

go ahead bro

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Even at moderate temperatures, attractions between molecules seem to have little effect on the elasticity of gas-gas collisions is as a result of Choice B: Collisions are so brief, and molecules moving so fast, the attractions have insufficient time to significantly affect the system.

As a result of the high kinetic energy of gases; the movement of gases is so fast and randomised.

As such, during gas-gas collisions; The collisions are so brief and molecules moving so fast, the attractions have insufficient time to significantly affect the system.

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Answer:

answer

Explanation:

Ionic bond is a type of chemical bond that attract between oppositely charged ions.

Answer:

Research Skills enable people to identify a problem, collect informational resources that can help address the problem, evaluate these resources for quality and relevance and come up with an effective solution to the problem.

Explanation:

It is important because it might increase you critical thinking skills and it's much more easy for you to collect data. It also helps you analyze information from different sources off the internet.

Answer:

5.43 grams

Explanation:

because, Its one of the smallest planets, and is also very close to the Sun.

Which of the following examples involves an exothermic change.

Answer : C

Explanation : Gaseous water particles coming together to form fog

Hope this helps you!

Gaseous water particles coming together to form fog is an exothermic change due to release of thermal energy.

What is exothermic change?

An exothermic reaction is defined as a reaction that releases heat energy to the surrounding environment. It include any combustion process, rusting of iron, and freezing of water.

In conclusion, we can say that Gaseous water particles coming together to form fog is an exothermic change due to release of thermal energy.

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Explanation:

If the pH is between 0 and 7, then we have an acid.

If the pH is between 7 and 14, then we have an alkaline base.

If pH = 7, then it's neutral.

Answer:

0-7

Explanation:

Hope this helps!

Answer:

1) international unit of mass is N

  international unit of weight is kg

Explanation:

1) Mass of the ball is 10N

  Weight of the ball is 100kg  { 10×(Ball's weight) }

Answer:

Melting point is the temperature at which solid and liquid phases of a substance are in equilibrium.

Boiling point is the temperature at which its vapour pressure is equal to the external pressure.

Answer:

melting point is the temperature at which a solid changes into a liquid.  

boiling point, temperature at which the pressure exerted by the surroundings upon a liquid is equaled by the pressure

Explanation:

The circumstances that the system is exposed to may be altered in such a way as to cause a change in the chemical equilibrium. When we do this, we are said to be "stressing the balance."

In a chemical process that has reached equilibrium, one method is to either add or remove a product or a reactant. When more of a reactant is introduced, the equilibrium changes to alleviate the pressure, which results in the production of more products.

This is further explained below.

Generally,  When more product is introduced, the equilibrium moves away from products and toward reactants in an effort to lower the level of stress.

In the event that either the reactant or the product is withdrawn from the system, the equilibrium changes such that more of the corresponding substance is produced to compensate for the loss.

According to Ch/atelier's Principle, which claims that if a reaction in equilibrium is disturbed, the equilibrium will change to counterbalance that change, this indicates that if a reaction is in equilibrium, the equilibrium will alter to counteract that change.

If a solution has a large number of hydrogen ions, the pH of the solution will be low, and it will be classified as an acidic solution.

In conclusion, On the other hand, a solution is said to have a high pH and be in the basic state if it contains a low quantity of hydrogen ions in its composition.

The ratio of the concentration of hydrogen ions to the concentration of hydroxide ions is negative and inversely proportional.

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Answer: The melting point would be lower and the boiling point would be higher

Explanation: From Beryllium to Barium the melting point and the boiling point were constantly decreasing. after that, Radium's boiling point starts to increase in temperature. So I would assume that if there was an element in group 2 with a higher atomic number than Radium it's melting point would continue decreasing while the boiling point increased.

When, we discovered a Group 2 element having an atomic number larger than radium (Ra). Then, we expect that the melting and boiling points of Group 2 elements generally decrease as you move down the group. This is because the outermost electrons are farther from the nucleus due to the increased number of electron shells.

Group 2 elements are alkaline earth metals, and they exhibit certain trends in their physical properties as you move down the group in the periodic table. Radium (Ra) is the last naturally occurring element in Group 2. If we discover a hypothetical Group 2 element with an atomic number larger than radium, it would likely be an artificially synthesized element, and its properties would be subject to speculation.

As we move down Group 2, the atomic number increases, and the elements have more electron shells. This leads to several trends:

Melting and Boiling Points:

The melting and boiling points of Group 2 elements generally decrease as you move down the group. This is because the outermost electrons are farther from the nucleus due to the increased number of electron shells. As a result, the metallic bonds that hold the atoms together weaken, making it easier to break the lattice structure and transition from solid to liquid or gas.

If the hypothetical Group 2 element has an atomic number larger than radium, it would likely have more electron shells and thus a lower melting and boiling point compared to radium. This trend follows the pattern observed in other Group 2 elements.

Density:

Group 2 elements also tend to become less dense as you move down the group. This is because the increase in electron shells leads to larger atomic sizes, and the increased atomic volume decreases the packing efficiency in the solid state.

A Group 2 element with an atomic number larger than radium would likely have a lower density than radium, following the trend observed in the rest of the group.

Reactivity:

Group 2 elements become more reactive as you move down the group. This is because the outermost electrons are farther from the nucleus and are more easily lost, leading to more vigorous chemical reactions, especially with water and oxygen.

The hypothetical Group 2 element might exhibit increased reactivity compared to radium and other elements in the group.

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The numbers that balance the following equation: 4NaCl + 2SO2 + H2O + O2 → Na2SO4 + 4HCl is 2, 1, 2.

BALANCING EQUATION:

4NaCl + 2SO2 + 2H2O + O2 → 2Na2SO4 + 4HCl

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Answer:212

Explanation:yeah

Answer:

Alkaline fuel cells use an alkaline electrolyte such as potassium hydroxide or an alkaline membrane that conducts hydroxide ions rather than protons.

Explanation:

OR USE GATORADE AND POWERADE. BE A MAN.

Answer:

Radioactive Basement in Chernobyl

"We had to be especially cautious near roads and in the city of Pripyat, there are regular security patrols in those areas. Unfortunately, the legal 'day' tours are not allowed to enter any of the buildings in Pripyat as the structural integrity of some buildings is questionable."

Explanation:

Answer:

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Explanation:

Answer:

result = 310

significant figures =  2

Explanation:

How to round significant figures:

look the first non-zero digit if rounding to one significant figure, look the digit after the first non-zero digit if rounding to two significant figures. draw a vertical line after the place value digit that is required.look at the next digit.

result = 310

significant figures = 2

Answer: smaller, larger

Explanation:

Cations are always {smaller} than the parent atom. Anions are always {larger} than the parent atom.

Cations are always smaller than the parent atom, and anions are always greater than the parent atom.

The term "parent atom" refers to an atom that has not yet undergone any chemical transformation. A parent atom is one that is discovered in its initial state.

Because they contain fewer electrons while maintaining the same nuclear charge, cations are always smaller than their parent atoms. Because the protons in the nucleus are holding the remaining electrons more tightly, their radii are less than those of the parent atoms. In the case of anion, this is the opposite.

Due to variations in electron-electron repulsion, the ionic radii of cations and anions are always less or bigger than the parent atom, respectively. The trends in ionic radius follow those in atomic size.

Thus, Cations are always smaller than the parent atom, and anions are always greater than the parent atom.

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The transfer of heat will continue as long as there is a difference in temperature between the two locations. Once the two locations have reached the same temperature, thermal equilibrium is established and the heat transfer stops.

Heat is transferred from a warm body to a cooler body. The temperature of the warm body drops while the temperature of the cooler body rises. When the two temperatures are equal, thermal equilibrium is attained, and the heat transfer stops.

Answer:

you differentiate to find the derivative

Explanation:

Answer:

A derived unit is a unit that results from a mathematical combination of SI base units.

OR

A unit of measurement obtained by multiplication or division of the base units of a system without the introduction of numerical factors.

Explanation:

i dont know if that answered your question

Answer:

0.19312

0.19312 0.19312

Answer:

The shape of a molecule is mostly determined by repulsion among the pairs of electrons around a central atom.

Each atom in the bond contributes one valence electron, forming a shared pair in a single covalent bond. electrons that are  valence electrons of the atom. Two valence electrons are lost by Sr when forming SrI[tex]_2[/tex].

A valence electron is an electron that is part of an atom's outer shell in chemistry and physics. If the outer shell is open, the valence electron can take part in the creation of a chemical bond.

The electrons in the s and p orbitals are those that are in question. Core electrons are those found in the inner shell. These electrons are vital to the majority of chemical processes because they have higher energy than the electrons in inner orbits. The electrons farthest from the nucleus are the electrons that are  valence electrons of the atom. Two valence electrons are lost by Sr when forming SrI[tex]_2[/tex].

Therefore, two valence electrons are lost by Sr when forming SrI[tex]_2[/tex].

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Answer:

Mechanical waves are waves that must go through a medium in order to propagate. Mechanical waves can also be transmitted through solids, so the medium doesn't have to be a gas or a liquid.

Explanation:

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