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?
Answers
One other fact that we can keep in mind as to why the advice proposed by the firefighter is correct is that hotter air rises, while cool air will sink.
The firefighter in question offered the advice to exit a burning building by remaining close to the floor. One additional benefit of this proposed method is to avoid the effects of the hot air when attempting to exit, which can be life-saving given the effects that increased heat may have on a person.
Heat can have a variety of negative effects on a person, which include:
HeatstrokeDehydrationFaintingLower Blood PressureConfusionand many other life-threatening conditions if the heat is extreme.
The benefit of staying close to the floor in order to avoid the heat may be very small in such extreme conditions, however, even a few degrees of difference can be enough to get out safely at times.
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Related Questions
Why is it important to possess fundamental research skills in pursuing your study?
Answers
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.
Perform the following mathematical operation, and report the answer to the correct number of significant figures.
0.34 x 0.568 = [ ? ]
Answers
Answer:
0.19312
0.19312 0.19312
Describe how you could adjust the settings of the simulation to increase the number of red (H3O+) and blue (A-) particles in the solution of equilibrium. In three to four sentences, justify your answer and explain how and why this would change the pH of the solution.
Answers
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.
how and why this would change the pH of the solution.?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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Why and how does heat transfer? When does it stop transferring?
Answers
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.
Kinda confused on this. i need some help.
Answers
To start, check to make sure it isn’t already balanced. If coefficients aren’t present, it’s assumed to be one. In this case, there’s just one aluminum on both sides, but the right hand side has one more fluorine than the left. This means that we’ll have to change the coefficients to make them match. Since we can’t multiply the two fluorines to make three with a whole number, we have to change this one and the one in front of the aluminum fluoride. Let’s put a 3 in front of F2 and a 2 in front of AlF3. So far, we have:
Al + 3F2 -> 2AlF3
Check the number of fluorines; sure enough, we have six on both sides. However, we’ve imbalanced the aluminums by balancing the fluorines. The fix is easy, though; change the coefficient from one to two in front of the aluminum to make them match. The result is therefore:
2Al + 3F2 -> 2AlF3
Check your element totals again; sure enough, they’re all balanced. This is the balanced chemical equation.
Hope this helps!
What is the pH range for an acid?
0-7
7-14
7
0
Answers
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:
Any substance that has a pH of less than 7 is acidic - 0 is a strong acid whereas 6 is a weak acid. A pH of 7 means that the substance is neutral. Anything above pH 7 is alkaline, pH 8 is a weak alkaline and pH 14 is a strong alkaline.Hope this helps!
1) What is the most dangerous room in the world? How is it secured?
Answers
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:
How many valence electrons are lost by Sr when forming SrI2?
Answers
Hope this helped
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].
What is valence electron?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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Even at moderate temperatures, attractions between molecules seem to have little effect on the elasticity of gas-gas collisions because:_______.
A) They do affect molecular behaviour and we generally ignore it.
B) Collisions are so brief, and molecules moving so fast, the attractions have insufficient time to significantly affect the system.
C) Strong attractions do have an impact, but the randomness of the collisions cancel those attractions out.
D) Collisions between molecules are so rare, intermolecular forces have no measurable impact.
Answers
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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Sulphuric acid (H2SO4) is titrated against 25.00cm3 of 0.200 mol/dm3 Sodium hydroxide solution (NaOH). It is found that 23.20 cm3 of sulphuric acid is required for neutralization. Calculate the concentration of Sulphuric acid
Answers
Approximately 0.108 mol dm^-3
Explanations,
1. Make the balance chemical equation
2. Convert the 25 cm^3 to 0.025 dm^3 by multiplying 25 with 10^-3 (or 25 / 1000)
3. Concentration is equal to = moles of substance over volume of solution
4. Calculate how many number of moles present in 0.025dm^3 of sulphuric acid.
Mole = concentration x volume
^ rearranged from conc = mole/volume
Mole = 0.200 x 0.025 = 0.005 mol
5. Use the balance chemical equation ad mole ratio. In this case,
H2SO4 + 2NaOH —> 2H2O + Na2(SO4)
Thus the ratio between Sulphuric acid and Sodium Hydroxide is 1:2
Hence, the mole of H2SO4 is 0.005/2 = 0.0025 mol
6. Calculate the concentration of the sulphuric acid by using conc. = mole/volume
Hence the answer is 0.0025/(23.20 x 10^-3) = 0.108 mol dm^-3 rounded off at the 3 Sigfigs
I hope u understand sorry for any mistakes done.
4NaCl + 2SO2 + _____H2O + _____O2 → _____Na2SO4 + 4HCl
Which numbers balance this equation?
- 1,2,4
- 1,2,2
- 2,1,2
- 2,1,4
Answers
The numbers that balance the following equation: 4NaCl + 2SO2 + H2O + O2 → Na2SO4 + 4HCl is 2, 1, 2.
BALANCING EQUATION:
Balancing a chemical equation means to make sure that the number of atoms of each element on both sides of the equation are equal. According to this question, the following chemical reaction are given: 4NaCl + 2SO2 + H2O + O2 → Na2SO4 + 4HCl Some of the coefficients (numbers) have been placed there while some are missing. The equation that includes the missing coefficients (numbers) to balance the equation is:4NaCl + 2SO2 + 2H2O + O2 → 2Na2SO4 + 4HCl
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Answer:212
Explanation:yeah
Which of the following correctly completes the statement?
Cations are always _____ than the parent atom and anions are always _____ than the parent atom.
Answers
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.
What is 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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Help I need them fast pls
Answers
Answer:
answer
Explanation:
Ionic bond is a type of chemical bond that attract between oppositely charged ions.
distance from the nucleus to the outermost electron orbital
Answers
1. Differentiate mass and weight.
2. When a person goes on a diet, do they really want to lose weight or mass? Explain
3. Describe what will happen to mass and weight when you go to the moon. Why would this happen?
4. A bag weighs 8 newtons and has a mass of 5 kg on the moon. What is the strength of gravity on the moon?
Answers
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) }
Suppose you discovered a Group 2 element that has an atomic number larger than radium (Ra). What do you expect the melting and boiling points to be? Explain.
Answers
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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Who know the answers for both of these or know were to get them from
Answers
Answer:
kdkekejdjejeneneenendjenejekeke do do do do do do d
Answer:
go ahead bro
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Which of the following examples involves an exothermic change.
a. ice melting on a warm day
b. water boiling in a tea kettle
c. gaseous water particles coming together to form fog
d. air in a bicycle tire gaining pressure after a long ride
Answers
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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You think you have found a diamond. Its mass is 5.28 g and its volume is 2 cm3.What did you find? What is its density?
Answers
What’s boiling/melting point
Answers
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:
a 50.0 ml beaker contains 680. g mercury what is the density of mercury
Answers
Answer:
5.43 grams
Explanation:
because, Its one of the smallest planets, and is also very close to the Sun.
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]
Answers
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
Mechanical waves need to travel through a medium like solid, liquid, and gas.
TRUE or False
Answers
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:
Hope this helps! Brainliest would be appreciated. :)
What does it mean for a unit to be "derived"?
Answers
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
How many formula units are in 0.0022 mol of NaCl (it’s urgent plz)
Answers
Answer:
1.204 × 10²¹ unitsExplanation:
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
1.204 × 10²¹ unitsHope this helps you
density is 6g/mL and volume is 40 mL what is the mass
Answers
Answer:
240g
Explanation:
Using the equation m=pV, where m=mass, p=density, and V=Volume
m=(6)(40)=240
m=240
the basic fact that determines molecular shapes is that
Answers
Answer:
The shape of a molecule is mostly determined by repulsion among the pairs of electrons around a central atom.
Pls help me, I’ll give 30 points
Answers
suitable electrolytes for fuel cells
Answers
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.
How to round the number 314.77 to 2 significant figures
Answers
Answer:
发你如果热客人看看如果
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
