Answer:
Heating the particles in the ethanol energized them, and they escaped to fill the room as a gas
Explanation:
Ethanol reacted and bonded with the gases in the air and so after heating the ethanol ,it quickly disappeared and a strong aroma was filled in the room .
What do you mean by ethanol ?Ethanol is a primary alcohol that is ethane in which one of the hydrogens is substituted by a hydroxy group.
Ethanol is an important industrial chemical; it is used as a solvent, in the synthesis of other organic chemicals.
Ethanol produced either by fermentation or by synthesis is obtained as a dilute aqueous solution and must be concentrated by fractional distillation.
Ethanol reacted and bonded with the gases in the air and so after heating the ethanol ,it quickly disappeared and a strong aroma was filled in the room .
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Maria wants to determine which type of disinfectant kills the most bacteria.
Which of the following is the best way for Maria to determine this?
A.
Interview ten different people to determine which type of disinfectant they prefer.
B.
Put the same amount and species of bacteria on ten identical plates, and add ten different kinds of disinfectant to each plate.
C.
Ask ten different companies that make disinfectants which type is best.
D.
Put the same amount and species of bacteria on ten identical plates, and add a different disinfectant to each plate.
A I think thats what I would put
Can yall help me i suck at this and rlly need help
Answer:
Fireworks is exothermic
Endothermic is Cookies
Explanation:
Exothermic reactions transfer energy to the surroundings and the temperature of the surroundings increases. Endothermic reactions take in energy and the temperature of the surroundings decreases.
Hope this helps
A basketball weighs approximately 1.35 kg. What is this mass in grams (g)?
step by step
Answer:
1350 g
Explanation: just add a 0
Which phrase describes a metamorphic rock?
formed from a volcano
was once buried underground
formed from evaporating water
contains minerals that have not changed
Answer:
C: was once buried underground
Explanation:
Hope this helps!
Answer:
The correct answer you are looking for is B i have got 100% on this test.
Explanation:
hop this helps! └(^o^)┘ ↖(^ω^)↗
What volume of O2 would be required to react with 4.6 grams of Na
Volume of O₂ = 1.12 L
Further explanationThe reaction equation is the chemical formula of reagents and product substances
A reaction coefficient is a number in the chemical formula of a substance involved in the reaction equation. The reaction coefficient is useful for equalizing reagents and products
Reaction
4Na+O₂ ⇒ 2Na₂O
Ar Na = 23 g/mol
mol Na :[tex]\tt mol=\dfrac{4.6}{23}=0.2[/tex]
mol O₂ :[tex]\tt \dfrac{1}{4}\times 0.2=0.05[/tex]
Assume at STP (0 C, 1 atm), 22.4 L for 1 mol , then volume of O₂ :
[tex]\tt 0.05\times 22.4=1.12~L[/tex]
How does the atomic mass of the atom change when an electron is added or removed?
If you could magically make two neutrons in the nucleus of an atom disappear, the atomic number and the electrical charge of that atom would remain unchanged. Neutrons do not carry an electrical charge so adding or removing them from the nucleus does not change the electrical charge of the nucleus. It does, however, change the mass of the nucleus. Adding or removing neutrons from the nucleus are how isotopes are created.
Protons carry a positive electrical charge and they alone determine the charge of the nucleus. Adding or removing protons from the nucleus changes the charge of the nucleus and changes that atom's atomic number. So, adding or removing protons from the nucleus changes what element that atom is! For example, adding a proton to the nucleus of an atom of hydrogen creates an atom of helium. (Actually, a few neutrons have to be added as well to make the new nucleus stable, but the end result is still helium.) Keep in mind that atoms, by definition, are electrically neutral and always contain the same number of protons and electrons.
What are the names of the two categories of living organisms?
Answer:
Prokaryotes (which are bacteria and archea)
Eukaryotes (which is plants, animals, protists and fungii)
What part of the atom is responsible for the behavior of the alpha particles?
Answer:
nucleus
Alpha particles are subatomic fragments consisting of two neutrons and two protons. Alpha radiation occurs when the nucleus of an atom becomes unstable (the ratio of neutrons to protons is too low) and alpha particles are emitted to restore balance.
Explanation:
How is the human body like a stone arch?
Answer:
It is like an arch because it bends horizontal just like we do and the legs of the arch support the stone like our feet and legs support the weight of us.
Explanation:
A black hole is a
a. an object of zero volume and infinite density
b. an object from which nothing, not even light, can escape
c. an object that emits x rays as matter falls into it
d. an object that disappears from our universe
e. all of the above
Answer:
B. an object from which nothing, not even light, can escape
Explanation:
If we know the force of an object in Newtons) and we know how fast the object accelerates in ms"), then we can easily find the mass of the object by
dividing the _ by the _
Answer:
If we know the force of an object in Newtons) and we know how fast the object accelerates in ms"), then we can easily find the mass of the object by
dividing the force by the mass
A car travels at 35.0 mi/hr. How far has it gone in 2455 seconds?
Answer:
The answer is 23.8 milesExplanation:
The distance covered by an object given it's velocity and time taken can be found by using the formula
distance = velocity × timeFrom the question
velocity = 35.0 mi/hr
time = 2455 s = 0.68 hr
We have
distance = 35 × 0.68
We have the final answer as
23.8 milesHope this helps you
Which of the following is the conjugate acid of H2P04- ?
A. HAP04
O B. PO 3-
O C. HP04-2
O D. H3PO4
Answer:
phosphoric acid H3PO4
The conjugate acid of H₂PO⁴⁻ is H₃PO₄. Therefore, option D is correct.
A conjugate acid is a species that is formed when a base accepts a proton (H⁺). It is the species that is one proton (H⁺) more acidic than the original base.
The base is the species that can accept a proton (H⁺), and the conjugate acid is the species that is formed when the base accepts the proton. The conjugate acid has one additional proton compared to the base.
Conjugate acids play an important role in acid-base reactions as they are formed when bases accept protons, and they can donate protons in subsequent reactions to regenerate the original base.
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the amount of space an object occupies is called its
A chemical formula is shown below. How many total atoms are in 2 molecules of the chemical formula shown?
C6H12N2O
Answer: 42
Explanation: I took a quiz and had the same question.
Please answer correctly !!!!!!! Will mark brainliest !!!!!!!!!!!!
I beleive it would be 0.8
the volume of water alone is 4.8
the volume of rock and water is 5.6
you would subtract them both to find the volume of the Rock.
When 3.00 grams of methane, CH,, reacts according to the balanced equation below, how many molecules of water are produced?
CH, + 202 - CO2 + 2H20
Answer:
2.41×10²³ molecules of water
Explanation:
Given data:
Mass of methane = 3 g
Molecules of water formed = ?
Solution:
Chemical equation:
CH₄ + 2O₂ → CO₂ + 2H₂O
Number of moles of methane:
Number of moles = mass/ molar mass
Number of moles = 3 g/ 16 g/mol
Number of moles = 0.2 mol
Now we will compare the moles of water with methane.
CH₄ : 2H₂O
1 : 2
0.2 : 2 × 0.2 = 0.4 mol
Molecules of water:
1 mole = 6.022×10²³ molecules of water
0.4 mol ×6.022×10²³ molecules of water / 1mol
2.41×10²³ molecules of water
Question 3 (4 points)
A dipole bond is formed when electrons are not shared equally in a covalent bond, resulting in a partial negative charge on one end of the
molecule and a partial positve charge on the other end.
O True
O False
All covalent compounds donot exist as giant aggregates. Why?
Convert 49 lbs into grams
To get an approximate result, multiply the mass value by 454.
hope this help!
The Tacoma narrows bridge collapsed due to?
A. Refraction
B. Reflection
C. Diffraction
D. Resonance
Which pair of elements will have the same number of valence numbers
A- lithium and barium
B- gallium and germanium
C- tellurium and polonium
D- iondine and xenon
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The hybrid orbitals of a molecule are shown in the figure.
These hybrid orbitals were most likely formed by mixing
one s orbital and one p orbital.
one s orbital and two p orbitals.
one s orbital and three p orbitals.
O two s orbitals and two p orbitals.
Answer:
One s orbital and One p orbital
Explanation:
What mass of water freezes if 5.43 kJ oh heat are released in the process
Answer:
16.3 g
Explanation:
got it right on ck
PLZ HELP WILL MAKE U BRAINLIEST! what is acceleration???
Answer: Acceleration is when something accels.
Or, in simple terms, when the velocity changes rapidly to a very quick speed.
Hope this answer helps you!
Best of Regards!
Crystallisation is a separation technique used to separate____ solids from a liquid solvent.
Answer:
separate soluble solids from liquid
Explanation:
A in Chemistry
Crystallization is a separation technique used to separate solute solids from a liquid solvent.
What is Crystallization?Crystallization is the process of disuniting or separating two substances or molecules that are mixed, and are of different forms of matter. Such as solid and liquid. The process separates mixtures by three processes. These processes are freezing, precipitation, and deposition.
It is the main process of separating solid from liquid. In this process, the solute came above the liquid in crystal form and this is called precipitation.
Freezing separates the substance that has a different freezing point. By deposition, the substance that is solid and called solute is deposited below the liquid in the container.
Thus, crystallization separates the solute solids from a liquid solvent.
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What is the role of gravity in the solar system?
Answer:
Explanation:
Gravity is what holds the planets in orbit around the sun and what keeps the moon in orbit around Earth. ... Gravity creates stars and planets by pulling together the material from which they are made. Gravity not only pulls on mass but also on light.
The unit for force is kg m/s.
True Or false?
Calculate the entropy change when 4.31 g of H2 reacts with O2 according to the reaction
2 H2(g) + O2(g) → 2 H2O(l)
at 298 K and 1 atm pressure. The standard molar enthalpy of formation of H2O(l) at 298 K is −285.8 kJ/mol. The corresponding free energy of formation is −237.2 kJ/mol.
Answer in units of J/K.
Answer:
Explanation:
ΔG = Δ H - T ΔS
Given , ΔG = -237.2 kJ / mol
Δ H = - 285.8 kJ / mol
T = 298
Putting the values in the equation
-237.2 = - 285.8 - 298 x ΔS
ΔS = .163 kJ / mole K
moles of water formed = 4.31 / 2 = 2.155
entropy change required = 2.155 x .163 kJ / K
= 351.26 J / K .
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