Answer:
20 neutrons
Explanation:
How many protons and electrons are there in a neutral atom of lithium
Np=Ne
Answer:
3 protons and also 3 electrons
Explanation:
z=p=e
a sample of gas is originally at 12°C is heated so it's total kinetic energy doubles . what is the new temperature of the sample
wE know
[tex]\boxed{\sf E\propto T}[/tex]
Hence If Kinetic energy is doubled Temperature will also be doubled.
[tex]\\ \sf\longmapsto T=12(2)=24°C[/tex]
The kinetic energy is directly proportional to the temperature. Hence, as kinetic energy doubles, the temperature become approximately 297.15°C.
What is kinetic energy ?Kinetic energy is the energy generated by virtue of the motion of the substance.
Assuming the pressure and volume of the gas sample are constant, the temperature of an ideal gas is directly proportional to its average kinetic energy. When the total kinetic energy of the gas doubles, its temperature will also double.
To calculate the new temperature of the sample, we can use the following equation:
(T2/T1) = (E2/E1)
where T1 is the initial temperature, E1 is the initial total kinetic energy, T2 is the final temperature, and E2 is the final total kinetic energy.
Since the total kinetic energy has doubled, E2 = 2E1. Substituting this into the equation, we get:
(T2/T1) = 2
Multiplying both sides by T1, we get:
T2 = 2T1
Substituting the initial temperature T1 = 12°C + 273.15 K = 285.15 K, we get:
T2 = 2 x 285.15 K = 570.3 K
Converting the final temperature from Kelvin to Celsius, we get:
T2 = 570.3 K - 273.15 = 297.15°C
Therefore, the new temperature of the gas sample is approximately 297.15°C.
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Halogens cause the torch of a flame to turn ____ when they are brought into contact with heated copper.
Answer:
Bright green
Explanation:
Halogens in ionic form, will react with copper wire. When heated in a flame, a wire that contains halogens will produce a bright, green flame.
The heating of halogens with the copper forms a bright green flame.
What is a flame test?A flame test is given as the test for the identification of the elements with the analysis of the color of flame on burning.
The elements on heating are excited to higher energy levels, and when they return, they emit the absorbed radiation in the form of light. The halogens are ionic in nature, and with the flame test in the presence of the heated copper, they liberate bright green flame.
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40 points Critical Thinking Questions
8. Two of the following six numbers are written incorrectly. Circle the two that are incorrect.
What do you think is wrong about the two numbers you circled?
Its option e
Why?
[tex]\\ \sf\longmapsto 0.000354\times 10^4[/tex]
It can be written as
[tex]\\ \sf\longmapsto \dfrac{354}{10000}\times 10^4[/tex]
[tex]\\ \sf\longmapsto \dfrac{354}{10^4}\times 10^4[/tex]
Cancel 10^4[tex]\\ \sf\longmapsto 354[/tex]
Hence its wrongly written
d is also wrong
[tex]\\ \sf\longmapsto 75.3\times 10^2[/tex]
[tex]\\ \sf\longmapsto \dfrac{753}{10}\times 100[/tex]
[tex]\\ \sf\longmapsto 7530[/tex]
Its need not be simplified .if the negative and the positive attract why are the proton and the electron not attracted to each other?
Answer:
They do attract
Explanation:
Protons and neutrons aren't electrically attracted to each other but when they get close enough they can exchange particles and become bound together by a strong force.
Offering 17 points for right answer.
Does anyone know the name of Platinum +1 and Sulfur? Like the compound name?
Answer:
Platinum sulfide
Explanation:
How do I convert 1 times 10 to the 20th power seconds to years. Dimensional analysis? 1x10^20 seconds to years
To convert a second measurement to a year measurement, divide the time by the conversion ratio.
Since one year is equal to 31,556,952 seconds, you can use this simple formula to convert:
years = seconds ÷ 31,556,952
1 ×10^20 sec to years = 3.16887646 × 10^12 years
Use the blue slider labeled mass to carefully adjust the mass of the red block until neither sinks nor floats. The block should stay wherever your cursor places it without moving up or down. Next remove the block from the water and put it in the scale. Record its new mass.
Answer:
4.1 grams
Explanation:
Answer:
4.1
I solve this solution and then i got correct on it so its 4.1 thank you!
Drag conversion units onto the boxes in the equation to make conversions. Some boxes can be left empty. Click on a
unit to remove it from its position.
1 cmCu
9 g Cu
9.5 x 1021 atoms Cu
1 g Cu
1 kg
1000 g
1 cm
1 ml
1
1000 cm3
70.0 kg x
X
X
II
70.0 kg•L
We have that 70kg of Copper Cu is having a volume of [tex]V=7.76442liters[/tex]
1 cmCu
=9 g Cu
9.5 x 10^21 atoms Cu
=1 g Cu
1 kg =1000 g
1 cm
=1 ml
1
=1000 cm3
70.0 kg x X _X II
70.0 kg•L
Generally We First determine the No of Atoms in 70kg of cu
No of Atoms of c[tex]u=\frac{weight}{atomic mass of cu}*n[/tex]
Where
n=Avogadro's Constant
[tex]n= 6.02214076 x 10^{23}[/tex]
Therefore
No of Atoms of cu[tex]=\frac{70*10^3}{63.5}*6.02214076 * 10^{23}[/tex]
No of Atoms of cu=6.63858037x10^{26} atoms of Cu
Hence
We determine the the grams of copper derived from [tex]6.63858037x10^{26}[/tex]atoms of Cu
No of grams of cu[tex]=\frac{6.63858037x10^{26}}{9.5 x 10^{21}}*1[/tex]
No of grams of cu=69879.79337 g of Cu
Generally
No of grams of Cu=liters
Where
9 g of Cu= 1cm^3 Cu
Therefore
Volume of cu
[tex]V=(69879.79337)*\frac{1}{9}*\frac{1}{1000}[/tex]
[tex]V=7.76442liters[/tex]
In conclusion
70kg of Copper Cu is having a volume of [tex]V=7.76442liters[/tex]
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We are to drag the given conversion units onto the boxes in the equation in order to make conversions in the boxes that are left empty.
The dimensional analysis for the conversion ratio is given as follows
1cm^3 Cu = 9g Cu 9.5*10^21 atoms of Cu = 1 g Cu
1 kg = 1000 g 1 cm^3 = 1 mL
1 L = 1000 cm^3
Here is the box equation
box box box
70 g ×----- × ------ × ----- =
box box box
From the given information, the volume of the Cu sample in Liters is:
= 7.765 liters
From the parameters given:
the mass of the sample of Cu = 70 kgThe first thing we are to do is to calculate the number of atoms of Cu in 70 kg by using Avogadro's constant.
We know that the number of atoms of Cu is:
[tex]\mathbf{= \dfrac{mass \ weight \ of \ Cu}{atomic \ mass \ of \ cu}\times avogadro's \ constant}[/tex]
where;
weight in Cu = [tex]\mathbf{70 * 10^{3}}[/tex]the atomic mass of Cu = 63.5 Avogadro's constant = [tex]\mathbf{6.023 \times 10^{23} \ Cu \ atoms}[/tex]the number of Cu atoms is:
[tex]\mathbf{= \dfrac{70*10^3}{63.5}\times 6.023 * 10^{23}}[/tex]
[tex]\mathbf{= 6.6395 \times 10^{26} \ atoms \ of \ Cu}[/tex]
However, from the given conversion ratios:
If [tex]\mathbf{9.5\times10^{2}}[/tex] atoms of Cu = 1 gram of Cu
∴
atoms of Cu will be:
[tex]\mathbf{= \dfrac{6.6395 \times 10^{26} \ atoms \ of \ Cu \times 1 \ gram \ of \ Cu}{9.5*10^{21} \ atoms \ of \ Cu }}[/tex]
[tex]\mathbf{= 0.69889 *10^{5} \ grams \ of \ Cu}[/tex]
Since:
1cm³ Cu = 9g Cu and; 1 L = 1000 cm³∴
The correct setup of the sample in the box can be computed as follows:
[tex]\mathbf{= 0.69889 *10^{5} \ gram \ of \ Cu \ \times \dfrac{1 cm^3 \ of \ Cu }{9 \ g \ of \ Cu }\times \dfrac{1 \ Liter}{1000 \ cm^3}}[/tex]
= 7.765 liters
Therefore, we can conclude that the Volume of Cu sample in liters is:
= 7.765 liters
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1. How are the speed of light and a light-year different?
Answer:
Unlike the speed of your car when running errands, the speed of light is constant throughout the universe and is known to high precision. ... To find the distance of a light-year, you multiply this speed by the number of hours in a year (8,766). The result: One light-year equals 5,878,625,370,000 miles (9.5 trillion km).
Answer:
-Speed of light is the fastest speed ever imaginable. No object having a mass can go faster than light.
Light year is the distance traveled by light, if it moves continuously for 1 whole year, or roughly 365 days.
Explanation:
The three most common phases of matter are _______.
Answer:
solids, liquids, gases
Briefly identify a few characteristic points about the following bonds:
a. Ionic bonds
b. Covalent bonds
c. Hydrogen bonds.
Answer:
Chemical bonds hold molecules together and create temporary connections that are essential to life. Types of chemical bonds including covalent, ionic,
Explanation:
Ionic bond will form by transferring the electrons , covalent bond formed by sharing the electrons while hydrogen bond will be formed by bond between electronegative atom and hydrogen molecule.
What is ionic bond?
The chemical bond is formed when electrons are transferred from one atom to another. An ionic bond is the name for this type of relationship. Their melting and boiling points are quite high. Ionic chemicals, in other words, seem to be non-volatile.
What is covalent bond?When one non-metal reacts with just another non-metal, electrons are shared across their atoms, resulting in the development of a covalent bond. Among two or more atoms with same non-metal, a covalent connection can be established.
What is hydrogen bond?Hydrogen bonding is just a sort of dipole-dipole attraction that occurs between molecules rather than a covalently link with a hydrogen atom.
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there are about 115 elements, each of which has its own chemical___
Answer:
properties is the answer
there are about 115 elements, each of which has its own chemical. properties
Answer:
Chemical symbol
Explanation:
There are 115 elements, each of which has its own chemical symbol .
You can separate sugar from Sand because sugar is and sand is not what does sugar have that stand don't??? Help please
What number will go on the top when writing isotopic notation for Carbon-13?
Answer:
1? I guessed and I'm practicing on this stuff because I am new and I still need to learn this stuff
Please help me please
Answer:
Hope this helps.
Explanation:
See the picture. Hope it helps. Sorry if i was incorrect.
A vessel initially containing 1 kmol of CO and 4.76 kmol of dry air forms an equilibrium mixture of CO2, CO, O2, and N2 at 3000 K, 1 atm. Determine the equilibrium composition.
Answer:
Equilibrium composition for, no2 =.7365
The equilibrium composition for, nN2=3.76
Explanation:
If the molarity of a 50 mL Fe2+ solution is 6.53*10-5, what is the concentration in ppm?
Taking into account the definition of molarity and ppm, if the molarity of a 50 mL Fe²⁺ solution is 6.53*10⁻⁵ M, the concentration in ppm is 5.846×10⁻⁵.
First of all, you have to know that molarity is a measure of the concentration of a substance that indicates the number of moles of solute that are dissolved in a given volume.
Molarity is determined by:
[tex]Molarity=\frac{number of moles of solute}{volume}[/tex]
Molarity is expressed in units [tex]\frac{moles}{liter}[/tex].
On the other hand, ppm is a concentration unit used for very dilute solutions. A solution with a concentration of 1 ppm contains 1 gram of solute per million (10⁶) grams of solution, or equivalently, 1 mg of solute per kilogram of solution.
Since these dilute aqueous solutions have densities of 1 g/mL = 1 kg/L, 1 ppm also corresponds to 1 mg of solute per liter of solution.
Then, knowing the molarity of the solution, which is expressed in [tex]\frac{moles}{liter}[/tex], it is necessary to find the concentration expressed in [tex]\frac{mg}{liter}[/tex]. To do this, you must first know the number of moles present in 50 mL. For that, you replace the value of the molar concentration and the volume in the definition of molarity as follows, where 50 mL=0.05 L (being 1000 mL= 1 L):
[tex]6.53x10^{-5} \frac{mole}{liter} =\frac{number of moles of solute}{0.05 L}[/tex]
Solving:
number of moles= 6.53×10⁻⁵[tex]\frac{moles}{liter}[/tex] *0.05 L
number of moles= 3.265×10⁻⁶ moles
Being the atomic mass of Fe 55.85, then the mass containing 3.265×10⁻⁶ moles moles of Fe is calculated by:
[tex]mass=3.265x10^{-6} molesx\frac{55.85 grams}{1 mole}[/tex]
mass=5.846×10⁻⁸ grams
Being 1 grams equals to 1000 mg, then 5.846×10⁻⁸ grams is equal to 5.846×10⁻⁵ mg.
Then in 1 L of solution there is present 5.846×10⁻⁵ mg of Fe²⁺.
Remembering that in dilute solutions 1 ppm = 1 mg/L, if the molarity of a 50 mL Fe²⁺ solution is 6.53*10⁻⁵ M, the concentration in ppm is 5.846×10⁻⁵.
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Iron reacts with oxygen in the air to form rust. Predict the signs of enthalpy, entropy, and Gibbs free energy change for this process (for the system). Explain the sign for each one
life scientist study life and the many processes that occur in living things____-
Answer:
life scientist study life and the many processes that occur in living things__during experiments__-
please mark me brainliest pleaseHow many atoms of hydrogen are there in 36 g of NH4NH4?
explain in detail plz
Answer:
he formula mass of ammonia is 14 + 1 3 = 17. The number of moles in 36 g ammonia is 36/ 17 = 2.11mol. A mole is 6.02 10, so the number of hydrogen atoms in a 2.11 moles of ammonia is 2.11 *6.02*10^23 = 1.27 *10^24 atoms
Explanation:
Which is larger aliter or a quart?
Answer:
a liter is larger, hope that helps :)
What is Iron's atomic number and the number of protons?
Answer:
In February, we have selected iron, the most abundant element on Earth, with chemical symbol Fe (from the Latin word “ferrum”) and atomic number 26. A neutral iron atom contains 26 protons and 30 neutrons plus 26 electrons in four different shells around the nucleus.
Answer:
Iron's atomic number is 26 and it has 26 protons
A 0.10 L solution with 1.85 g of Ca(OH)2 is of what concentration, in molarity?
Answer:
0.25M
Explanation:
The formula of concentration is c=m/M•V
c=1.85g/74g.mol•0.10L
c=0.25 M
Estimating Circle the correct answer
1. Gas is $5.00 for 2 gallons and you want to fill your almost full gas tank which can hold an additional 1.5 gallons, you will spend a) $5.00 b) less than $5.00 c) more than $5.00
To fill your almost full tank with additional 1.5 gallons, you will spend less than $5.00
According to the question;
2 gallons of gas cost $5.00
Recall that your tank is almost full and what you need is additional 1.5 gallons.
If;
2 gallons of gas cost $5.00
1.5 gallons cost 1.5 * 5.00/2 = $ 3.75
$ 3.75 is less than $5.00 hence the correct answer is option B: less than $5.00.
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definition of scientific varable
Answer:
a scientific variable is a factor or condition that can change or effect the final outcome. There are three types being an independent variable, dependent variable, and controlled variable.
Please help ASAP!!!!!!
Answer:
the moon and the planets are closer than other stars
Which term best describes the important pieces of information that scientists gather and record during an experiment?
conclusions
data
research
supplies
Answer:
conclusions i think i am not confirmed
Answer:
b-data
Explanation:
right on the unit test review on edge
brainliest???
As discussed during the lecture, the enzyme HIV-1 reverse transcriptae (HIV-RT) plays a significant role for the HIV virus and is an important drug target. Assume a concentration [E] of 2.00 µM (i.e. 2.00 x 10-6 mol/l) for HIV-RT. Two potential drug molecules, D1 and D2, were identified, which form stable complexes with the HIV-RT.
The dissociation constant of the complex ED1 formed by HIV-RT and the drug D1 is 1.00 nM (i.e. 1.00 x 10-9 mol/l). The dissociation constant of the complex ED2 formed by HIV-RT and the drug D2 is 100 nM (i.e. 1.00 x 10-7 mol/l).
1. Compute the total concentration of [D1]tot that is needed to bind 90% of the HIV-RT at the given concentration [E]tot. Provide your answer as a numerical expression with 3 significant figures in the unit mol/l. You do NOT have to consider competition betwwen the drugs D1 and D2! They are administered separately.
2. Compute the total concentration of [D2]tot that is needed to bind 90% of the HIV-RT at the given concentration [E]tot. Provide your answer as a numerical expression with 3 significant figures in the unit mol/l.You do NOT have to consider competition betwwen the drugs D1 and D2! They are administered separately.
Answer:
C)[D]/[ED] = 5.20
D)[D]/[ED] = 5.20
E)[D']_T = 1.495* 10 ^-7 M
F)[D'] / [ED'] = 0.0579
Explanation:
E = 250 nM =2.5* 10 ^-7 mol/L , T=298.15 K
Dissociation constant of K_D = 1.3 μM (1.3 *10 ^-6 M)
E + D ⇄ ED → K_a = [ED] / [D][E] (association constant)
ED ⇄ E + D → K_D = [E][D] / [ED] (dissociation constant)
C)
[E] =2.5*10^-7 mol/L
K_D = 1.3* 10^-6 M
K_D = [E][D] / [ED] → [D]/[ED] = K_D / [E]
= [D]/[ED] = 1.3* 10 ^-6 / 2.5 *10^-7
= 13/25 * 10
=130/25 = 5.20
[D]/[ED] = 5.20
D)
ΔG =RTln Kd
ΔG_2 for E and D = 1.987 * 298.15 * ln 1.3*10^-6
ΔG_2 592.454 * [ln 1.3 +ln 10^-6]
ΔG_1 = 592.424 [0.2623 - 13.8155]
ΔG_2 = -592.424 * 13.553
ΔG_1 = -8184.633 cal/ mol
ΔG_1 = -8184.633 * 4.18 J/mol = -34244.508 J?mol
ΔG_1 = -34.245 KL/mol
so, ΔG_2 = ΔG_1 - 10.5 KJ/mol
ΔG_2 = -34.245 - 10.5
ΔG_2 = -44.745KJ / mol
ΔG_2 =RT ln K_D
-44.745 *10^3
=8.314 *298.15 lnK_D
lnK_D' = - 44745 / 2478.81 g
ln K_D' = -18.051
K_D' = -18.051
K_D' = e^-18.051
[D]/[ED] = 5.20
E)
[E] = 2.5* 10 ^-7 mol/ L = a
K_D' = [E][D] / [ED'] E +D' → ED'
K_D' = a/2(x-(a/2) / (a/2)
KD' = x - a/2
=2.447 *10^-8 = (2.5/2) * 10^-7
x=2.447 * 10^-8 + 1.25 * 10^-7
x = 2.447 *10^-8 + 1.25 * 10 ^-7
x= 10^-7 [1.25 + 0.2447]
x = 1.4947 * 10^-7
[D']_T = 1.495* 10 ^-7 M
F)
K_D' = [E][D'] / [ED']
[D'] / [ED'] = KD' / [E]
[D'] / [ED'] = 1.447 *10^-8 / 2.5* 10^-7
[D'] / [ED'] = 0.5788 * 10^-1
[D'] / [ED'] = 0.0579
Explanation:
...
How many decigrams (dg) are in 0.779 kg?
Answer:
7790
Explanation:
Answer:
7790 decigrams
Explanation:
