Answer:
Electrons in atoms occupy energy levels, also called electron shells, outside the nucleus . Different shells can hold different maximum numbers of electrons. The electrons in an atom occupy the lowest available energy level first. This is the shell nearest the nucleus.
Explanation:
HELPPPP FASTTT! 4. Which is more electronegative?
A. Fluorine
B. Chlorine
C. Bromine
D. Iodine
Explain Your Answer Choice
Answer:
D.lodine
Explanation:
Lodine is a nonsteroidal anti-inflammatory drug . It works by reducing hormones that cause inflammation and pain in the body. Lodine is used to treat mild to moderate pain, osteoarthritis, or rheumatoid arthritis.
I hope it's helpful for you......
How many atoms are in 14 moles of I? Watch your significant figures.
A. 8.4 x 10^24 atoms of l
B. 8.43 x 10^24 moles of l
C. 8.4 x 10^23 atoms of I
D. 8.43 atoms of l
Answer:
8.43 x 1024 moles of I
Explanation:
Please help!! I have 10 minutes left!!
Explanation:
1 is a process that occurs when gases in earth's atmosphere trap the sun's heat .
2 . heat in the atmosphere to warm the planet .
I only know the first too sorry ✨
What volume of a 40.0 % by volume acetone solution can be
made with 20.0 mL of acetone?
Answer:
50 milliliters of acetone solution
Explanation:
If a solution is 40% by volume of acetone, then we have 40 mL of acetone in a 100 mL solution. So if we have 20 mL of acetone, we get: 100 mL solution 40 mL ( CH3) 2CO⋅
20mL (CH3) 2CO =50mL solution
The volume percent of 40% indicates that 40 ml of acetone is present in 100 ml solution. Then, 20 ml acetone can be made into 50 ml solution.
What is volume percentage ?Volume percentage is a common term used to express the concentration of a solution. Volume percentage of a solution is the ratio of the volume of the solute to the volume of the solvent multiplied by 100.
The volume percentage of the solution measures how much volume of the solute is present in 100 ml of the solution. Thus a 50% by volume solution is 50 ml solute in 100 ml solution.
Given that volume percentage of acetone = 40%.
that is 40 ml of acetone is present in 100 ml of the solution.
Therefore, the volume of the solution containing 20 ml of acetone is :
(20 × 100)/40 = 50 ml.
Therefore, 50 ml of 40% by volume o solution can be made by 20 ml of acetone.
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How many grams of C3H8
must be used to produce
3.75 X 1024 molecules of CO2 gas?
C3H8 + 5O2 → 3CO2 + 4H2O
Answer:
91.28 g
Explanation:
The mass of C₃H₈ used is 91.08g
What is Mole?
The mole is an amount unit similar to familiar units like pair, dozen, gross, etc. It provides a specific measure of the number of atoms or molecules in a bulk sample of matter.
A mole is defined as the amount of substance containing the same number of atoms, molecules, ions, etc. as the number of atoms in a sample of pure 12C weighing exactly 12 g.
Given,
Molecules of carbon dioxide = 3.75 × 10²⁴
We know that,
1 mole = 6.023 × 10²³ molecules
Moles of carbon dioxide = 3.75 × 10²⁴ ÷ 6.023 × 10²³
= 6.226 moles
From the reaction, 3 moles of carbon dioxide is produced by 1 mole of C₃H₈.
So, 6.226 moles will be produced by (1 ÷ 3) × 6.226
= 2.07 moles of C₃H₈
Mass of C₃H₈ = moles × molar mass
= 2.07 × 44
= 91.08g
Therefore, mass of C₃H₈ used is 91.08g
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1. A student performed the titration as in this experiment. He transferred a 2.00 mL sample of the
acid into a flask, diluted it with water, and then began to add sodium hydroxide solution from the
buret. After adding 50 mL of NaOH solution, the sample in the flask still had not turned pink.
What error did the student make?
Answer:
The student shouldn't have added water to the acid.
Explanation:
The aim of titration is to standardize an unknown solution. Recall that a standard solution is one whose concentration is known.
After the acid has been prepared, it has a particular concentration. The student should't have diluted it further. The further dilution of a small volume of acid drastically reduces the concentration of the acid to such low value that the H^+ ions present are insufficient to react with the OH^- from base in order to turn the solution to pink.
are you chemistry because you just blew up my heart
Answer:
i needed that lol
thank you
Explanation:
What is the main need or want the wave technology shown meets?
Answer: To efficiently communicate with others
Explanation:
this was the right on answer for me might be different for others
The main need or want the wave technology shown meets to see objects surrounding more clearly.
What is wave technology ?It is a floating device that operates in the same direction as the waves. With the use of the technology, energy may be captured even from relatively small waves. The device that is moved by waves activates a hydraulic system that can power a generator. The tube segment contains all the generation equipment and systems.
Early mechanization (1770s to 1830s), steam power and railroads (1830s to 1880s), electrical and heavy engineering (1880s to 1930s), Fordist mass production (1930s to 1970s), and information and communication are the five waves that have so far slammed into our society (1970s to 2010s).
Wave energy, also known as wave power, is the energy that ocean surface waves carry and absorb. The energy is then put to use in a variety of productive ways.
Thus, The main need or want the wave technology shown meets to see objects surrounding more clearly.
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Can someone help me with this question.
I’ll mark brainliest
Answer:
sodium carbonate im pretty sure (the formula is Na2CO3)
Explanation:
hope this helps :))
What is a solution?
a
a homogeneous mixture with particles between .01 and 1 nm
b
a homogeneous mixture with particles smaller than .01nm
c
a heterogeneous mixture with particles between .01 and 1 nm
d
a heterogeneous mixture with particles smaller than .01nm
You use 50.00 mL of a 12.0 M solution of HCl solution to make a 500.00 mL solution. What is the concentration of the new solution? *
Answer:
1.2 M
Explanation:
If you use the dilution equation (M1V1=M2V2), you end up with (50)(12)=(500)(M2), and when you solve for M2 you get 1.2 M.
You titrate 25.00 ml of 0.1894 M acetic acid with 0.2006 M NaOH. How many ml of NaOH (to four significant figures) will be required at the equivalence point?
Answer:
23.60 mL NaOH
Explanation:
The reaction is CH3COOH + OH- --> CH3COO+ + H2O
Since the reaction is one-to-one, we can use M1V1 = M2V2.
M1 = 0.1894 M CH3COOH
V1 = 25.00 mL CH3COOH
M2 = 0.2006 M NaOH
V2 = ?
Solve for V2 --> V2 = M1V1/M2
V2 = (0.1894 M)(25.00 mL) / (0.2006 M) = 23.60 mL NaOH
The daily change from daylight to darkness is caused by:
Answer:
The daily change from daylight to darkness is caused by:the rotation of the Earth on its axis. If the Earth did not rotate as it does, the day/night cycle would be very different or possibly even nonexistent.
Explanation:
Rank these transition metal ions in order of decreasing number of unpaired electrons. If two ions have the same number of unpaired electrons
Fe^3 , Mn^4+ , V3+ , Ni^2+ , Cu^+
Answer: [tex]Fe^{3+} > Mn^{4+}[/tex] > [tex]V^{3+}[/tex] = [tex]Ni^{2+}[/tex] > [tex]Cu^+[/tex]
Explanation:
Electronic configuration represents the total number of electrons that a neutral element contains. We add all the superscripts to know the number of electrons in an atom.
Fe: 26: [tex]1s^2s^22p^63s^23p^64s^23d^{6}[/tex]
[tex]Fe^{3+}:23:1s^2s^22p^63s^23p^63d^{5}[/tex] : 5 unpaired electrons
Mn: 25: [tex]1s^2s^22p^63s^23p^64s^23d^{5}[/tex]
[tex]Mn^{4+}:23:1s^2s^22p^63s^23p^63d^{3}[/tex] : 3 unpaired electrons
V: 23: [tex]1s^2s^22p^63s^23p^64s^23d^{3}[/tex]
[tex]V^{3+}:23:1s^2s^22p^63s^23p^63d^{2}[/tex] : 2 unpaired electrons
Ni : 28 : [tex]1s^2s^22p^63s^23p^64s^23d^{8}[/tex]
[tex]Ni^{2+}:23:1s^2s^22p^63s^23p^63d^{8}[/tex]: 2 unpiared electrons
Cu : 29 : [tex]1s^2s^22p^63s^23p^64s^13d^{10}[/tex]
[tex]Cu^{+}:23:1s^2s^22p^63s^23p^63d^{10}[/tex]: 0 unpaired electrons
Thus the order of decreasing number of unpaired electrons:
[tex]Fe^{3+} > Mn^{4+}[/tex] > [tex]V^{3+}[/tex] = [tex]Ni^{2+}[/tex] > [tex]Cu^+[/tex]
A scientist is adding oxygen to iron in a chemical reaction to create rust. At what point during
this reaction will the oxygen and iron quit making rust?
Answer: What type of chemical reaction is rusting of iron?
Rust is formed when iron reacts with oxygen in moist air. The following chemical equation represents the reaction: 4Fe + 3O2 → 2Fe2O3. Water is necessary for the oxidation reaction to occur and to facilitate transport of the electrons.
How many atoms are in 24.23 moles of Pb?
Answer: There are 3.3×1023atoms in 0.54 moles Pb. Explanation: To calculate the number of atoms in Pb, we use Avogadro's number,
Explanation:
When sewing, push the needle with a force of 10 N. its spike area is equal to 0.0001 mm2. what is the pressure of the needle in the tissue
Answer:
1×10^5
Explanation:
Pressure = Force/Area
P= 10/0.0001
P= 10000
P=1×10^5
what is a pure substance?
Answer:
A pure substance is a substance or an element whose impurities are extracted by concentration by chemical means.
e.g Aluminium is made pure by concentration of it's ore, bauxite by treatment with excess Sodium Hydroxide solution.
To produce one or more other organisms.
1.Life cycle
2.Inherited Trait
3.Reproduce
4.Offspring
Answer:
The answer is offspring
Explanation:
determining the molecular formula of a hydrocarbon with a relative molecular mass of 54
Answer:
C₄H₆
Explanation:
A hydrocarbon is a molecule that only contains atoms of Carbon and Hydrogen. As you remember, the molar mass of Carbon is 12g/mol and the molar mass of Hydrogen is 1g/mol.
To solve this question we can find the amount of Carbons necessary that doesn't exceed the 54g/mol. That is:
54g/mol / 12g/mol = 4.5
As the molecular formula must be given in whole numbers, the amount of Carbons is 4. This 4 carbons have a mass of:
12g/mol*4 = 48g/mol
And the hydrogens necessaries to suply the molecular mass are:
54 - 48 = 6 hydrogens
That means molecular formula is:
C₄H₆In a separate location, take notes from the sources you’ve identified. The notes will provide details for your paper. While taking notes, you may want to use these reading strategies. Use these sources if you find them helpful: Using your notes, compare the features of analog and digital signals in the table provided. Include one to three points for each feature and type of signal.
Answer:
Here is every answer for analog and digital (in order)
Analog:
Signal Shape: Smooth and continuousNumerical Values for Signal Measurements: Analog signals represent one continuous variable as the result of another continuous time-based variable. They are capable of outputting continuous information with a theoretically infinite number of possible values.Amount of Data that can be transmitted: analog circuits can conduct only fairly low-speed data communications. The maximum data rate over an analog facility is 33.6K bps when there are analog loops at either end. With 56K bps modems, only one end of the loop can be analog. The other end of the connection has to be digital. Energy requirements: light, sound, temperature, position, and pressurePrivacy and security (ability of the signal to be encoded in a secret code): not encryptedClarity of Signal: noise affects clarity and quality, noise is amplified, amplified noise causes more random information in the signal, signal bandwidth is lowDigital (in order):
Signal shape: stepping, square, and discreteNumerical Values for Signal Measurements: digital communication methods transmit a complete measured value, in other words both a numeric value and a unit of measurement Amount of data that can be transmitted: First of all, it is theoretically possible to transmit digital signals directly. Unfortunately when we use capacitors and inductors (energy storage devices) to match the impedance from the transmitter to the air (low impedance transistor say 5 ohms to 388 ohms (air)) these components introduce a bandwidth limiting match. Since all impulse functions have infinite bandwidth (transmitting a 1 and a zero) the bandwidth of the transceiver must be multi octave in order to have any reasonable efficiency. Systems engineers simplify the problem by introducing direct sequence modulation where a carrier is modulated 0/180 degrees dependent on the data rate.Energy requirements: voltage, accoustic pressure, and magnetization of a magnetic storage mediaPrivacy and security: encryptedClarity of signal: noise is lower in amplitude, electronics can ignore the noise, quality of signal is maintained, signal is highExplanation:
I did mine in bullet points, hopefully this helped!
Analog:
Signal Shape: Smooth and continuous
Numerical Values for Signal Estimations: Analog signals speak to one ceaseless variable as the result of another ceaseless time-based variable.
Amount of Information that can be transmitted: analog circuits can conduct as it were reasonably low-speed information communications.
Energy necessities: light, sound, temperature, position, and pressure Privacy and security : not encrypted
Clarity of Signal: clamor influences clarity and quality, commotion is amplified,
Digital:
Signal shape: stepping, square, and discrete
Numerical Values for Signal Measurements: digital communication methods transmit a complete measured value, in other words both a numeric value and a unit of measurement
Amount of data that can be transmitted: First of all, it is theoretically possible to transmit digital signals directly.
Energy requirements: voltage, accoustic pressure.
Privacy and security: encrypted
Clarity of signal: noise is lower in amplitude, electronics can ignore the noise, quality of signal is maintained, signal is high
Analog and digital is :Analog signal could be a continuous signal which speaks to physical estimations.
Digital signals are discrete time signals created by computerized balance.
Example :Human voice in discuss, analog electronic gadgets. Computers, CDs, DVDs, and other advanced electronic gadgets.
1)
Two locations, one in northern Canada and one in the southwestern United States, receive
the same amount of precipitation each year. The location in Canada is classified as a humid
climate. Why would the location in the United States be classified as an arid climate?
A)
The soil-moisture storage in the southwestern United States is more than that in northern
Canada.
B)
The vegetation of the southwestern United States is different from that of northern
Canada,
C)
The potential evapotranspiration is greater in the southwestern United States than in
northern Canada
D)
The yearly distribution of precipitation is different.
why water wet glass
Answer:
because water wets stuff expect for fire.
Answer:
The meaning of wet is covered or saturated with water or another liquid, showing that is a glass is covered in water it is considered wet.
Explanation:
Chemistry Questions
5) What is matter? Mention the characteristic of particles of matter.
Answer:
As known matter is anything that occupies space and has mass.
What is the density of 1.00 mol of carbon monoxide gas at STP?
Answer:
Density = mass / volume.
If this is an ideal gas then 1mol will take up 22.4L of volume (fact about ideal gases you should remember)
Since you have 1mol then you know the volume of the gas that you have (22.4L)
Now, just convert 1mol of CO to grams.The ptable tells you that the mass of 1 mol of C is 12g and the mass of 1 mol of O is 16g. So the mass of 1 mol of CO is......... :):)
Now you have the mass and the volume, so just divide :) enjoy
Based on the kinetic theory, which statement is true?
Matter is made up of only charged particles.
The particles of matter are stationary.
The particles of matter have zero kinetic energy.
Matter is composed of very small particles.
Answer:Matter is made up of only charged particles.
Explanation: Took the test
Can anyone list me all the 8 groups of the periodic table , going in order of course?
Answer:
alkali metals
alkali earth metals
transition metals
non metals
noble gases
halogens
rare earth metals
Explanation:
write 2 typical properties that are only common to transition metals
Answer:
Properties of transition elements
they are all metals and that most of them are hard, strong, and lustrous, have high melting and boiling points, and are good conductors of heat and electricity.
The process that fuels a star is BEST described as
A)
helium molecules being burned by fire.
B)
fusion of helium molecules to form hydrogen.
C)fission of helium molecules to form hydrogen.
D)
hydrogen molecules being forced together by gravity.
Answer:d
Explanation:
d
Hydrogen molecules being forced together by gravity is what best describes how a star is fuelled.
What is Gravity?This is defined as the the universal force of attraction acting between all matter.
Hydrogen molecules is forced together by gravity which is how stars are fuelled in space thereby making option D the most appropriate choice.
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A 5.0-g sample of Substance X increases in temperature from 20.0°C to 22.0°C when it absorbs 9.6J of heat. What is the specific heat of
Substance X in J/g °C)?
Answer:
0.96 J/g °C
General Formulas and Concepts:
Thermochemistry
Specific Heat Formula: q = mcΔT
m is mass (in grams)c is specific heat (in J/g °C)ΔT is change in temperature, final - initial (in °C)Explanation:
Step 1: Define
[Given] m = 5.0 g
[Given] ΔT = 22.0 °C - 20.0 °C = 2.0 °C
[Given] q = 9.6 J
[Solve] c
Step 2: Solve for c
Substitute in variables [Specific Heat Formula]: 9.6 J = (5.0 g)c(2.0 °C)[Specific Heat] Multiply: 9.6 J = (10. g °C)c[Specific Heat] Isolate c: 0.96 J/g °C = c[Specific Heat] Rewrite: c = 0.96 J/g °C