Answer: a burst
Explanation: a burst of energy could be substatuded for spark of energy
A spark of energy is required to begin the chemical reaction of burning a fossil fuel because; This spark of energy is required to attain the activation energy of the reaction.
Another name for this spark of energy is Ignition.
Definition:
The activation energy of a chemical reaction is the minimum amount of energy required for the commencement of the chemical reaction.
In this case, the spark of energy is required to attain the activation energy of the reaction.
Read more:
https://brainly.com/question/7639475
A sample of an unknown compound is vaporized at 150.°C . The gas produced has a volume of 960.mL at a pressure of 1.00atm , and it weighs 0.941g . Assuming the gas behaves as an ideal gas under these conditions, calculate the molar mass of the compound. Round your answer to 3 significant digits.
Answer:
the molar mass of the compound is 34.0 g /mol
Explanation:
The computation of the molar mass of the compound is as follows:
As we know that
PV = nRT
n = mass ÷ MW
PV = mRT ÷ MW
It can be rearrange as
MW = mRT ÷ (PV)
MW = (0.941)(0.082)(150 + 273) ÷ (1 × 0.96)
= 33.99g/mol
= 34.0 g /mol
Hence, the molar mass of the compound is 34.0 g /mol
based on the table below, what is the density of material A?
why are sound waves not used to communicate between objects in space?
Answer:
Because there's nothing in space for sound to travel trough
Students find that water can be created in a lab by burning hydrogen gas in air. They conclude that water is not a compound because only hydrogen is used to form the water. What is wrong with their conclusion?
Explanation:
Their conclusion is wrong because air is a mixture of many gases. The gas that combines with hydrogen to form the water is oxygen gas.
Hydrogen gas combines with oxygen gas to form water.
Water is made up of the elements hydrogen and oxygen.
When hydrogen is burnt in air, the combustion is made possible due to the presence of oxygen gas. Together, the reaction produces water. Water is therefore a compound made up of hydrogen and oxygenThe molecular mass of propanoic acid is 75.1 amu . Calculate the molecular mass of methyl ethanoate, an isomer of propanoic acid.
Express your answer with the appropriate units.
Answer:
75.1
Explanation:
The isomers contains the similar and accurate chemical formulas but at the same time the structure of the molecular is different. This represents that the masses of the molecular would be similar
Therefore the molecular mass of methyl ethanoate, i.e. an isomer propanoic acid is 75.1 i.e. equivalent to the molecular mass of the propanoic acid
So, it should be 75.1
which orbital has the highest energy level
Answer:
p orbitals
Explanation:
When forming an ion, iodine will do which of the following?
A.Lost electrons
B.Gain electrons
C.Neither
Answer:
B
Explanation:
Iodine has a negative charge, so it will gain electrons.
When forming an ion, nitrogen will have what charge?
Answer:
The valence electrons of nitrogen in its compounds are all sp³ hybridized orbitals. The formal charge on N is usually -1 for an anion, 0 for a neutral compound, and +1 in cations. A nitrogen atom with a formal charge of -3 would correspond to a nitride ion, N³⁻, which is strongly basic in aqueous solution. Hope this helps...
Explanation:
Brainliest please?
Light waves travel at different speeds through different medium. Which list shows the correct order of increasing speed of light waves in medium, from slowest to fastest?
A solids → liquids → gases
B gases → liquids → solids
C gases → solids → liquids
D liquids → solids → gases
Answer:
I think the correct answer is B
The speed of the light is different in different medium. The speed of the light is highest in vacuum. The increasing speed of light waves in medium, from slowest to fastest is gases → liquids → solids. The correct option is B.
What is light wave?A light wave is a mechanical wave. A mechanical wave is defined as the wave which is an oscillation of matter and it is responsible for the transfer of energy through a medium. There are two types of mechanical wave, they are longitudinal waves and transverse waves.
The light wave is a transverse wave. The movement of the particles is at right angles or perpendicular to the motion of the energy. The speed of the light depends on the density of the medium. The more density, less will be the speed of the wave.
The gaseous state has less intermolecular force of attraction as compared to the liquids and solids. So in gaseous state light has maximum speed.
Thus the correct option is B.
To know more about light, visit;
https://brainly.com/question/30749500
#SPJ3
how many molecules of nitrogen are in 1.25 mol N2?
Answer:
7.52 x 10²³ molecules N
Explanation:
multiply 1.25 mol of N2 by Avogadro's Number
What type of particles would be in a sample of carbon dioxide?
Nuetrons, Electrons, and Protons.
Argon (Ar) is an element in group 18. Argon is _____.
a gas highly reactive
a metalloid
a good conductor of heat
Answer:
c
Explanation:c
it is a good conducter
A student makes observations of a tree in a nearby forest. Which of the following observations of the
tree's characteristics would be useful in determining its identity with a dichotomous key?
A
It contains the nests of several birds.
B
Its leaves are long and narrow.
с
Its branches were recently cut.
D
It provides shade for ground brush.
The observations of the tree's characteristics would be useful in determining its identity with a dichotomous key is its leaves are long and narrow. The correct option is B.
What is an observation?Observation is a process of recognizing and recording an event or fact that frequently involves measuring it with tools. Recognizing and recording an event, or fact frequently involves measuring with tools. Field notes are written observations made while participating in field observations or immediately afterward.
They are crucial for understanding phenomena that have been seen in the field. Field notes frequently take the form of scratch notes, diaries, and notebooks. In the scientific field, observation is a crucial step.
Therefore, the correct option is B. Its leaves are long and narrow.
To learn more about observation, refer to the link:
https://brainly.com/question/13196625
#SPJ6
what is the volume of 18.9 g of a liquid that has a density of 0.956 g/ml
The compound iron(III) nitrate is a strong electrolyte. Write the transformation that occurs when solid iron(III) nitrate dissolves in water. Be sure to specify states such as (aq) or (s).
Answer:
Fe(NO₃)₃ (s) → Fe³⁺ (aq) + 3 NO₃⁻ (aq)
Explanation:
The iron (III) nitrate is a salt, that can be 100 % dissociated in water.
Fe(NO₃)₃ (s) ⇒ Fe³⁺ (aq) + 3 NO₃⁻ (aq)
It is not considered 100% neutral, because Fe³⁺ can release protons to water, when it is hidrated. It works similar as the Al ³⁺.
NO₃⁻ (aq) + H₂O (l) ← OH⁻(aq) + HNO₃(aq)
This reaction can not occur. Nitrate is a weak base, derivated from a strong acid, so it can't make hydrolysis.
Salt can be a little acid, because Fe³⁺ react to water to give protons, and a determined complex
Fe³⁺ (aq) + H₂O(l) ⇄ Fe(OH)²⁺ (aq) + H⁺(aq)
In an industrial process ethanol C2H60 burns with O2 to produce heat. Each mole of ethanol produces 8842 joules during the reaction.
C2H5OH (1) + 3 O2(g) 2 CO2(g) + 3 H2O(0) + 8842 Joules
How many Kilojoules are obtained from burning 982.6 g of ethanol?
Answer:
[tex]189kJ[/tex]
Explanation:
Hello!
In this case, since one mole of ethanol release 8,842 J per 1 mole of ethanol, we can write:
[tex]\frac{8,842J}{1molC_2H_6H}[/tex]
Thus, since we need the energy released by 982.6 g of ethanol, we compute the moles in such mass of fuel:
[tex]n=982.6g\frac{1mol}{46.08g} =21.3mol[/tex]
Therefore, the result is:
[tex]\frac{8,842J}{1mol}*21.3mol=188,545J[/tex]
Which in kJ is:
[tex]189kJ[/tex]
Best regards!
The density of aluminum is 2.7 g/cm3 and that of Al2O3 is about 4 g/cm3. Calculate the PB ratio for Aluminum. (Hint: The Pilling-Bedworth Ratio (PBR) gives the volume of oxide formed to the volume of metal atoms.)
a) 1.28
b) 0.28
c) 0.75
Answer:
1.28
Explanation:
Al = aluminium
Density of Al = 2.7g/cm³
Density of Al2O3 = 4g/cm³
Molecular weight of Aluminum = 27g/mol
Molecular weight of Al2O3= 101.96 g/mol
Pilling bedworth ratio = Rob
= M(Al2O3) * density of Al / n* molecular weight of Al * density of Al2O3
= 101.96g/mol x 2.7g/cm³/2x 27g/mol x 4g/cm³
= 275.292/216
= 1.28
From the calculation above 1.38nis the PB ratio for aluminum
I have a chem final and 2 unit assessments to make up for that class and I don't know how to do anything at all. suggestions? I can't just learn everything in one night, I have other work
Answer:
So what I would first do is make a schedule or a list.
First list the most important things, which are your two unit assessments, right?
If your other work isn't that bad, you can start working on your unit assessments now. I know, you don't know how to do it. So here are some more tips!
Start the oldest one first: the one that has been overdue the longest. I once came to a school pretty late, and the first thing I had to do was a science unit test! I barely knew anything! So here's what I did:
Research! I always researched what my question was about. And figuring out what the unit is about too. If you learn what the unit is about, you're gonna ace it!
Learning about a whole topic in one night is hard, OBVIOUSLY. So, TURN YOUR PHONE OFF! CLICK OFF ANY DISTRACTING WEBSITES, AND DON'T THINK ABOUT GOING TO PINTEREST! Put on some LYRICLESS music (only if you want), and take out your notebook.
(If you feel you're going to forget something that you researched later, write it down in your notebook.)
Organize your notes. I suggest writing in different colors for different things, to make it a little bit fun! Different pages for different things, too.
Set a limit. Research/study for how long you think you should, I would say 2 hours or less, and then start on your test.
Oops! We've landed on a question we have no idea about! That's okay! We'll just recheck our notes, and see if we've got any info on that. Oh no, we don't! Let's see, is there a topic about this in any of the resources we have?
ALSO, please don't try to cheat by looking up the questions. Maybe that's okay if we really can't get it, but if you couldn't get it, I would just suggest coming back to that question later or making a reasonable guess.
Also, make sure you enjoy it! Even if that joy is only a little bit... I like to pretend I'm doing school with my friends, or that I'm making a video! Yes, I know, I'm a weirdo.
Repeat these steps for the 2nd test!
Need anymore help? Ask me in the comments!
Solids, liquids, and gases are the three most commonly accepted phases of matter. Explain the properties of each phase, including their relative energy.
Answer:
Solid state : In this state, the molecules are arranged in regular and repeating pattern. The molecules are closely packed that means they are fixed and vibrate in place but they can not move from one place to another. They have least kinetic energy. For example : chair
Liquid state : In this state, the molecules are present in random and irregular pattern. The molecules are closely packed but they can move from one place to another. They have more kinetic energy than solids but less than that of gases. For example : oil
Gaseous state : In this state, the molecules are present in irregular pattern. The molecules are not closely packed and they can move freely from one place to another and spread out. They have most kinetic energy. For example : Hydrogen
Solids, liquids and gas are those substances that have the most common types of bonds and they accept the phases of matter.
The solids that offer max resistance and friction have solid integral cohesion and forces that bind them together. The liquids have lesser denser forces and hence they are mobile while gases are highly mobile as they have large number of spaces and gaps.Learn more abut the three most commonly accepted phases.
brainly.com/question/16784307.
A 2.00 liter evacuated container has a mass of 1050.0 g. When the container is filled with an unknown gas at 800. mm Hg pressure and 25.0 °C the mass is 1052.4 g. What is the molar mass of the gas (in g-mol"')?
(A) 28
(B) 31
(C) 54
(D) 56
Answer:
(A) 28
Explanation:
To solve this problem we use the PV=nRT equation, where:
P = 800 mmHg ⇒ 800/760 = 1.05 atmV = 2.00 Ln = ?R = 0.082 atm·L·mol⁻¹·K⁻¹T = 25.0 °C ⇒ 25.0 + 273.16 = 298.16 KWe input the data:
1.05 atm * 2.00 L = n * 0.082 atm·L·mol⁻¹·K⁻¹ * 298.16 KAnd solve for n:
n = 0.086 molNow we calculate the gas' mass:
Gas Mass = (Mass of Container w/ Gas) - (Mass of Empty Container)Gas Mass = 1052.4 g - 1050.0 g = 2.4 gFinally we calculate the unknown gas' molar mass, using its mass and its number of moles:
Molar Mass = mass / molesMolar Mass = 2.4 g / 0.086 mol = 27.9 g/molSo the answer is option (A).
What information does a solubility table give?
A. It tells which compounds react with oxygen.
B. It tells which reactants are in the gaseous state.
O C. It tells which metals will replace other metals.
D. It tells which compounds will dissolve in water.
Answer:
Option D - It tells which compounds will dissolve in water.
Explanation:
It is used to predict whether or not a given ionic compound is soluble.
Answer:
d
Explanation:
An aqueous solution of calcium hydroxide is standardized by titration with a 0.112 M solution of hydrobromic acid. If 15.2 mL of base are required to neutralize 12.4 mL of the acid, what is the molarity of the calcium hydroxide solution?
Answer:
0.0457 M
Explanation:
The reaction that takes place is:
2HBr + Ca(OH)₂ → CaBr₂ + 2H₂OFirst we calculate how many moles of acid reacted, using the HBr solution's concentration and volume:
Molarity = Moles / VolumeMolarity * Volume = Moles0.112 M * 12.4 mL = 1.389 mmol HBrNow we convert HBr moles to Ca(OH)₂ moles, using the stoichiometric ratio:
1.389 mmol HBr * [tex]\frac{1mmolCa(OH)_{2}}{2mmolHBr}[/tex] = 0.6944 mmol Ca(OH)₂Finally we calculate the molarity of the Ca(OH)₂ solution, using the given volume and calculated moles:
0.6944 mmol Ca(OH)₂ / 15.2 mL = 0.0457 MWhich electromagnetic waves have the shortest wavelength?
O A. Microwaves
O B. Radio waves
C. Gamma rays
O D. X-rays
Answer:
Gamma Rays
Explanation:
Each section of the electromagnetic (EM) spectrum has characteristic energy levels, wavelengths, and frequencies associated with its photons. Gamma rays have the highest energies, the shortest wavelengths, and the highest frequencies.
I looked it up
How many atoms of cadmium are in 2.50 moles
of cadmium?
2.50 moles Cd x
6.022 x 1023 atoms Cd
1 mol Cd
1 mole is equal to 6.023 × 10 ²³ molecules. 15.05 × 10²³ atoms of cadmium are in 2.50 moles of cadmium.
What do you mean by mole ?The term mole is defined as the amount of substance of a system which contains as many elementary entities.
One mole of any substance is equal to 6.023 × 10²³ units of that substance such as atoms, molecules, or ions. The number 6.023 × 10²³ is called as Avogadro's number or Avogadro's constant.
The mole concept can be used to convert between mass and number of particles.
1 mole of any substance = 6.023 × 10²³ molecules
Therefore, 1 mole of cadmium = 6.023 × 10²³ molecules
Then 2.50 moles of cadmium = 2.50 × 6.023 × 10²³
= 15.05 × 10²³ molecules
Thus, 15.05 × 10²³ atoms of cadmium are in 2.50 moles of cadmium.
To learn more about the mole, follow the link;
https://brainly.com/question/26416088
#SPJ2
__________ energy travels through matter in the form of waves.
Answer:
A wave is a form of energy therefore, it travels through matter in the form of packets of energy. Examples of waves include light, heat and sound waves. Matter from where the waves travel is known as a medium such as if waves travel through ocean then water is the medium.
Explanation: hope this helps
These type of cells lack a nucleus -
Answer:
Prokaryotes are cells that lacks nucleus
Explanation:
Hope you have a great amazing day and winter break:)
One mole of copper has a different mass from one mole of mercury because
Question 5 options:
A)
moles are different numbers depending on the atom.
B)
an atom of mercury has a different mass than an atom of copper.
C)
the mass is based upon the chemical interactions of copper and mercury.
D)
copper has a greater affinity for mercury and therefore will have a different mass.
Answer:
B)
an atom of mercury has a different mass than an atom of copper.
Explanation:
12. If mercury reacted with Fluorine (F), would a COVALENT or IONIC compound be
formed?
Answer: Ionic Compound
Explanation:
An ionic compound is formed when an element completely transfers its valence electron to another element. The element which donates the electron is known as electropositive element or the metal and the element which accepts the electrons is known as electronegative element or non metal.
A covalent compound is formed when an element shares its valence electron with another element. This bond is formed between two non metals.
Mercury flouride contain ionic bonds as it is made up of mercury metal and fllourine non metal.
3. Calculate the mass of the candle burned during this experiment.
4. Calculate the molar mass of candle wax (C24H) using the formula from question 1.
5. Calculate the moles of candle wax burned
Answer:
Calculate the number of moles of the candle that were burned by dividing the change in mass by the candle's molar mass. Candle wax is defined by the chemical formula C25H52 and has a molar mass of 353 grams per mole. Given a change in mass of 2 grams, divide 2 by 353 to obtain . 0056 moles.
C4H10 is an example of a (n) a. Molecular formula b. Structural formula c. Atomic formula d. Geometric formula
Answer:
molecular formula
Explanation:
hope it helps
