Answer:
Explanation: Combustion that results in a flame is very fast and is called burning. Combustion can only occur between gases. Fuels can be solids, liquids or gases. During the chemical reaction that produces fire, fuel is heated to such an extent that (if not already a gas) it releases gases from its surface. Only gases can react in combustion.
The difference in the reaction of a flame to carbon dioxide and reaction of the flame to hydrogen in terms of cause and effect has been explained below.
For a flame to light, it needs the presence of oxygen for a combustion reaction.
Now, for a flame in carbon dioxide; since Carbon (IV) oxide's molecules are heavier than the molecules of air, it means that they push out the oxygen molecules and others in the air and as a result it's now the carbon dioxide gas that will be hovering over the flame directly. Since oxygen which is the primary element for combustion is missing, it means the flame cannot react with it anymore and as such the flame will go off.
Whereas, for a flame in hydrogen; since hydrogen is lighter than air, it means it does not displace the oxygen that is making the flame to burn and as such instead will react with the oxygen to form water and release energy. But when ignited by the flame, it mixes with the air to form an explosion.
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Adding or removing thermal energy causes a change in state of matter.
O True
O False
Answer:"You can change an object's state of matter by adding or removing thermal energy. When you add thermal energy to an object, these things can happen: Particles move faster (increased kinetic energy). Particles get farther apart (increased potential energy)."
Explanation:
Need help ASAP!!please
This is methane, Methane is gas that is found in small quantities in Earth's atmosphere. Methane is the simplest hydrocarbon,
consisting of one carbon atom and a powerful greenhouse gas. What is the chemical formula for methane?
A)
4CH
B)
C4H
C)
C4H4
D)
CH4
Answer:
CH4
Explanation:
I looked it up and took the test
Answer:
You go to K12?
Explanation:
what phenomenon occurs after mass extinction?
Answer:
Diversification and adaptive radiation.
Explanation:
whats the formula for mass
Answer:
The unit of molar mass is kg/mol. Where, m = mass, v = velocity.
Hope that helps :)
Which of the following elements is a metalloid? A. phosphorus B. cobalt C. silicon D. magnesium
Answer: silicon
Explanation:it just is
Respuesta
es la C. silicio
Explanation:
No existe una definición estandarizada de elemento metaloide ni un consenso completo sobre los elementos que son metaloides.
En la clasificación de metaloides se suelen incluir a:
Boro (B)
Silicio (Si)
Germanio (Ge)
Arsénico (As)
Antimonio (Sb)
Telurio (Te)
Jeremiah pushed Anthony with a net force of 12 N. Anthony accelerated across the hall at 0.2 m/s2. What was Anthony’s mass?
Answer:
6
Explanation:
Work Shown:
Force = Mass*Acceleration
F = ma
12 = m*0.2
12/0.2 = m
60 = m
m = 60 kilograms
If the atomic number of an element is 16, what is the element's identity?
What is its atomic mass
Answer: The element is sulfur and the atomic mass is 32.07
Explanation: wasn’t sure what you were asking so gave you both
Beaux has purchased a synthetic material for a product he is launching. What is most likely a benefit of this material?
It is biodegradable.
It can be recycled cheaply.
It is heavy.
It can be mass produced.
Answer:
The answer is D. it can be mass produced
Explanation:
Answer:
The answer is D It can be mass produced.
Explanation:
I just took the test
An object has a mass of 441 g and a volume
of 10 cm3. What is the density of the object
in g/cm3?
The density is the ratio of the mass to the volume. The density of the object is 44.1 g/cm³.
What is density?Density (ρ) is the quantitative measurement of the substance having grams of mass that are dissolved per cubic meter of the solution. The density is calculated as:
ρ = M ÷ V
Given,
Mass of the object = 441 gm
The volume of the object = 10 cubic meter
Density is calculated as:
ρ = 441 ÷ 10
= 44.1 g/cm³
Therefore, 44.1 g/cm³ is the density of the object.
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Which of these describes a challenge that the engineer of a high-altitude
airplane would need to consider?
A. More fuel is used at higher altitudes.
B. The airplane may succumb to the power of gravity as lift
decreases at higher altitudes.
C. The airplane may need a heat shield for protection from sonic
booms.
O D. The airplane will create more drag at higher altitudes than lower
altitudes.
Answer:
I think its (B)
Explanation:
as when the air thins out at higher elevations, your lift decreases so at some point, the plane cant produce enough lift to overcome gravity.
If the temperature of a substance increases will the particles of that substance be moving faster or slower or at the same speed as they were before the temperature changed
Answer:
If the temperature increases, temperature reflects the speed of the molecules, so if the molecules are at a higher temperature, they are faster and they start to break bonds and new things react.
Explanation:
What is the concentration of a solution of 10. Moles of copper nitrate in 5.0 liters of solution
Answer:
10.5
Explanation:
well we added together so thats the result
A massless length of twine can withstand a maximum tension of 490 N. The twine is used to spin a 28-kg ball in horizontal circular motion of radius 1.8 m. The ball is spun faster and faster until the twine breaks. What was the maximum speed of the ball?
7.2 m/s
3.2 m/s
5.6 m/s
11 m/s
Answer:
5.6 m/s
Explanation:
Does the model correctly represent the electron dot diagram of magnesium? Why or why not? Check all that apply.
M g with 1 dot above and 1 right.
*{Yes, because the chemical symbol of magnesium is Mg.}
No, because the chemical symbol of magnesium is Mn.
*{Yes, because magnesium has two valence electrons.}
No, because magnesium has seven valence electrons.
No, because both of the dots should be on top of the chemical symbol
Answer 1 and 3
Answer:
1 and 3
Explanation:
Answer: A and B or 1 and 3
Explanation:
Help please! I’ll mark brainliest to who ever answers this first!!
Answer:
paleontologists is the answer to scientist who studies fossil
answer this pls thanks
Answer: It is element nitrogen. It has an atomic number of 7 and the valence electron is 5. It needs 3 electrons to complete its octet state. That's why sometimes it has the oxidation number of -3 in ammonia.
As water is cooled, its density increases until it reaches about
A. 4°C
B. 25°C
C. O'C
D. -2°C
ummmm im in 2nd period and in test prep
What is a convection current (Be sure to include how temperature and density are involved.
Convection currents are flowing fluid that is moving because there is a temperature or density difference within the material. ... A temperature difference leads to an energy transfer from an area of higher energy to one of lower energy. Convection is a heat transfer process.
What is one example of pre-exising marine life?
dinosaur egg
shrimp burrow
leaf imprint
bird bone
Answer:
Shrimp burrow
Explanation:
Shrimp are types of sea life, whales eat them
Someone answer these please! It’s multiple choice
Answer: Number 1 is titanium.
The one where you calculate a tin block is 13.0cm.
3. Is A) Same Density And Same Chemical Properties.
4. Is also A. Ne
Explanation:
What does the symbol △ in a chemical equation mean?
Answer:
Delta, or subject to change.
Explanation:
Δ→ triangle indicates that the reaction is being heated.
What is a chemical equation?Chemical equations are symbolic representations of chemical reactions in which the reactants and the products are expressed in terms of their respective chemical formulae.
To express heating, we usually use Δ over reaction arrows like:
[tex]CaCO_ 3[/tex]. Δ → [tex]CaO+O_2.[/tex]
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Who knows the answer to this please help
please someone answer and help :)
Colour in acid of red litmus paper
Red
Litmus paper turn red when it comes in contact with acid. It turn blue if it come in contact with a base. Neutral litmus paper is purple
Transfer of heat through conduction can occur in which of the following?
A. Solids
B. Liquids
C. Gases
D. All of the above
Why do electrons falling into different orbits give off characteristics wavelengths?
Explanation:
Because the difference in energy between orbits is different in different types of atoms, moving electrons between different orbits requires photons carrying different amounts of energy (different wavelengths).
A student analyzed an unknown sample that contained a single anion. The sample gave a white precipitate upon addition of a solution of AgNO3 which dissolved in ammonia. Which anion is present in the unknown solution? Write the corresponding net ionic equation.
Answer:
Chloride ion
Explanation:
The anion present in the unknown solution would be chloride ions.
A white precipitate of silver chloride is usually formed when drops of silver nitrate are added to a solution containing chloride ions. The ionic equation is as below:
[tex]Cl^- (aq) + Ag^+ (aq) --> AgCl (s)[/tex]
You can see protons yes or no
No. Not with the naked eye