Answer:
Silicon has 14 protons, 14 neutrons, and 14 electrons.
Explanation:
What is the difference between an atomic symbol and a chemical symbol?
Answer: A chemical symbol is a one- or two-letter designation of an element. Compounds are combinations of two or more elements. A chemical formula is an expression that shows the elements in a compound and the relative proportions of those elements.
What do you notice about the movement of the molecules of the two samples?
Explanation:
For sample A, I put the temperature to 93.2 C and sample B to 6.8 C. Once I dragged them together, I noticed that the numbers were going down the second I put them together! Sample A was getting colder and Sample B was getting warmer. As I let both the samples do their thing, I realized they weren't changing temperatures anymore. Both samples stopped at 50.0 C and have never changed temperatures since then.
Match the word with the definition. Write the correct letter in the space
provided. Reminder
that your answers should be blue.
A. Proton
B. Periodic Table
C. Atom
D. Chemical Symbol
E. Group
F. Atomic Number
G. Atomic Mass
H. Period
1. Electron
J. Neutron
K. Nucleus
1. Average mass of all the isotopes of that element
2. Series of elements arranged in rows on the periodic table
3 Smallest particle that still can be considered an element
4. Subatomic particle with no charge
5. An abbreviation of an element's name, usually one or two letters
6. Subatomic particles with a positive charge
7.
A small region in the center of an atom
8.
Arrangement of elements showing repeating pattern of their
properties
9. Series of elements arranged in columns on the periodic table
10.
Subatomic particles with a negative charge
11.
Number of protons in the nucleus of an atom
Answer:
this may be wrong and if it is im sorry
A=6
B=8
C=3
D=5
E=9
F=11
G=1
H=2
I=10
J=4
K=7
A chemist prepares a solution of barium acetate BaCH3CO22 by weighing out 52.9g of barium acetate into a 100.mL volumetric flask and filling the flask to the mark with water. Calculate the concentration in /gL of the chemist's barium acetate solution. Round your answer to 3 significant digits.
Answer:
529g/L
Explanation:
The concentration in chemistry is defined as the amount of solute in a determined amount of solution. The concentration in g/L means the amount of grams of solute (In this case, barium acetate), per liter of solution.
To solve this problem we need to find grams of solute (52.9g, already given) and the volume in liters (Converting 100mL to liters):
Volume:
100mL * (1L / 1000mL) = 0.100L
And concentration in g/L is:
52.9g / 0.100L =
529g/LWhich action is necessary for a solar eclipse to occur?
Answer:
Moon has to be in-between the Earth and the Sun.
2. Moon's umbra should sweep your place.
3. Latitude and longitude of your place should be within the befitting limits.
what????????????????????????????????????????????????
Answer:
I
Explanation:
d
k
uhm....is there anything you need help with?
MULTIPLE CHOICE QUESTION
If
you are warming yourself near the
campfire, you are experiencing heat
transfer from the fire, through:
Convection
Conduction
Radiation
Answer:
radiation
Explanation:
if 3.26 g of FeNO33 is dissolved in enough water to make exactly what is the molar concentration of nitrate ion g
Answer:
0.404M
Explanation:
...To make exactly 100.0mL of solution...
Molar concentration is defined as the amount of moles of a solute (In this case, nitrate ion, NO₃⁻) in 1 L of solution.
To solve this question we need to convert the mass of Fe(NO₃)₃ to moles. As 1 mole of Fe(NO₃)₃ contains 3 moles of nitrate ion we can find moles of nitrate ion in 100.0mL of solution, and we can solve the amount of moles per liter:
Moles Fe(NO₃)₃ -Molar mass: 241.86g/mol-:
3.26g * (1mol / 241.86g) =
0.01348 moles Fe(NO₃)₃ * (3 moles of NO₃⁻ / 1mole Fe(NO₃)₃) =
0.0404 moles of NO₃⁻
In 100mL = 0.1L, the molar concentration is:
0.0404 moles of NO₃⁻ / 0.100L =
0.404MWhat are the horizontal rows called on the Periodic Table?
O group
period
family
Answer:
Periods :)
HOPE IT HELPS YOU
MARK ME SS BRAINIEST
YOU CSN THANK ME IN THE COMMENT
Potassium nitrate has been used with charcoal and sulfur for centuries to make gunpowder. Using the Periodic Table provided in Canvas, Modules, General Information, determine the molar mass for potassium nitrate (KNO3).
Answer:
101.10200
Explanation:
Identify the molar mass of K, N, and O on the periodic table
K = 39.0983
N = 14.0067
O3 = 15.999×3 = 47.99700
Add them all together
39.0983+14.0067+47.99700 = 101.10200
Which organisms are producers? (SELECT ALL THAT APPLY.)
grass
bear
human
oak tree
fungus
Answer:
Grass
Oak tree
Explanation:
Bear and human are definitely not and fungus are decomposers.
If a gas effuses 2.17 times faster than Xe, what is its molar mass?
Answer:
Molar mass = 27.88 g/mol
Explanation:
The relationship between how gases effuses is given by Graham's law of effusion. This law is given as;
Rg / Rxe = [tex]\sqrt{}[/tex](Mxe / Mg)
Where;
Rg = Rate of effusion of gas g
RXe = Rate of effusion of Xe
Mxe = Molar mass of Xe = 131.29 g/mol
Mg = Molar mass of gas g
From the question;
Rg : Rxe = 2.17 : 1
Rg / Rxe = 2.17 / 1 = 2.17
2.17 = [tex]\sqrt{}[/tex]131.29 / Mg
Squaring both sides
4.7089 = 131.29 / Mg
Mg = 131.29 / 4.7089
Mg = 27.88 g/mol
find the weight of HNO_3 present in 20ml, 0.30 N
Answer:
mass of HNO₃ = 0.378 g
Explanation:
Normality = Molarity * number of equivalents
Molarity = Normality/number of equivalents
normality of HNO₃ = 0.30 N, Volume = 20 mL
HNO₃ ionizes in the following way:
HNO₃(aq) ----> H⁺ + NO₃⁻
Therefore, number of equivalents for HNO₃ is 1
molarity of HNO₃ = 0.30/1 =0.30 mol/dm³
Using the formula, molarity = number of moles/volume in liters
number of moles = molarity * volume
Number of moles of HNO₃ = 0.30 mol/dm³ * 20ml * 1 dm³ /1000 mL
number of moles = 0.006 moles
From the formula, mass = number of moles * molar mass
molar mass of HNO₃ = 63.0 g/mol
mass = 0.006 * 63
mass of HNO₃ = 0.378 g
What is the poH of a
2.6 x 10-6 M H+ solution?
pOH = [?]
Answer:
pOH = 8.41
Explanation:
From the question given above, we obtained the following information:
Concentration of Hydrogen ion [H⁺] = 2.6×10¯⁶ M
pOH =?
Next, we shall determine the pH of the solution. This can be obtained as follow:
Concentration of Hydrogen ion [H⁺] = 2.6×10¯⁶ M
pH =?
pH = – Log [H⁺]
pH = – Log (2.6×10¯⁶)
pH = 5.59
Finally, we shall determine the pOH of the solution. This can be obtained as follow:
pH = 5.59
pOH =?
pH + pOH = 14
5.59 + pOH = 14
Collect like terms
pOH = 14 – 5.59
pOH = 8.41
Therefore, the pOH of the solution is 8.41
Answer:
8.41
Explanation:
what is the empirical formula of A compound is found to contain 39.12 % carbon, 8.772 % hydrogen, and 52.11 % oxygen by mass.
Answer:
C₃H₈O₃
Explanation:
Let's assume we have 100 g of said compound. Then we would have:
39.12 g of C8.772 g of H52.11 g of ONow we convert those masses into moles, using their respective atomic weights:
C ⇒ 39.12 g ÷ 12 g/mol = 3.26 mol CH ⇒ 8.722 g ÷ 1 g/mol = 8.722 mol HO ⇒ 52.11 g ÷ 16 g/mol = 3.26 mol OThen we divide those moles by the smallest number among them:
C ⇒ 3.26 mol C / 3.26 = 1H ⇒ 8.722 mol H / 3.26 = 2.68O ⇒ 3.26 mol O / 3.26 = 1Finally we multiply those numbers by 3, so as to convert the 2.68 of H into an integer:
C ⇒ 1 * 3 = 3H ⇒ 2.68 * 3 = 8O ⇒ 1 * 3 = 3Thus the empirical formula is C₃H₈O₃
Why was Niels Bohr’s atomic model superior to all the earlier models?
A.
It proved that the atom was indivisible and therefore the smallest unit of matter.
B.
It showed how the electron could orbit the nucleus without falling into it.
C.
It was the first to show that the atom had no net charge.
D.
It used wave behavior to explain the positions of electrons around the nucleus.
Answer:
B
Explanation:
The Niels Bohr's atomic model superior to all the earlier models is because it showed how the electron could orbit the nucleus without falling into it
What ara the differences between the homolytic and heterolytic bond dissociation ? And why homolytic dissociation energy of H-H (104 KJ/mol) is lower than its heterolytic bond dissociation energy (401 KJ/mol)?
Answer:
Following are the difference in homolytic and hetrolytic bond dissociation.
Homolytic dissociation is referred as the amount of energy released during homolytic fission. Homolytic fission is known as the dissociation of chemical bond in two equal fragmentswhereas, Hetrolytic dissociation is referred as the amount of energy released during Hetrolytic fission. Hetrolytic fission is known as the dissociation of chemical bond in two unequal fragments.Homolytic fission gives one electron each to its fragments whereas Hetrolytic fissiongives two electron to one fragment and zero electron to other fragment.Energy released during Homolytic fission is lower than the Hetrolytic fission as the electron distribution to its fragments is uniform in homolytic whereas electron distribution to its fragments is uniform in hetrolytic fission.
Thus bonds form in hetrolytic fission is more stronger than the the bonds formed in homolytic fission.
Hence, more energy is required to break the bonds of hetrolytic fission as compared to homolytic fission
Thus, homolytic dissociation energy of H-H (104 KJ/mol) is lower than its heterolytic bond dissociation energy (401 KJ/mol)
The atomic number tells the number of
Please help!!! The person who gets it right gets brainlist
Answer:B because all of the atoms exploded AND GRAVITY WAS CREATED AND forced molecules together (God caused it btw)
Explanation:The BIBLE
2. Explain Why would it be difficult to find the volume of a rock using
a ruler?
Answer:
Most of these rocks are not made up of common geometric shapes
Explanation:
Because most rocks are not made up of common geometric shapes, it would be difficult or impossible to find the volume of a rock using a ruler; there would be no easy way to measure the rock's volume using a ruler
Hope this helped!
When iron is combined with copper (1) nitrate, it produces iron (II) nitrate and
copper. Which of the following could NOT be a mole ratio in this chemical
reaction?
A)1 mole Fe / 2 mole Cu
B)1 mole Fe(NO3)2 / 2 mole Cu
C)2 mole Cu(NO3)2 / 2 mole Fe
D)1 mole Fe(NO3)2 / 1 mole Fe
Answer:
C)2 mole Cu(NO3)2 / 2 mole Fe
Explanation:
I'm pretty sure.
When iron is combined with copper (1) nitrate, it produces iron (II) nitrate and copper. The following could NOT be a mole ratio in this chemical reaction is:
D) 1 mole Fe(NO₃)₂ / 1 mole Fe
To determine which of the given mole ratios could NOT be part of the chemical reaction between iron and copper(1) nitrate, we need to write the balanced chemical equation for the reaction and then compare it to the given ratios.
The balanced chemical equation for the reaction is:
Fe + Cu(NO₃)₂ → Fe(NO₃)₂ + Cu
A) 1 mole Fe / 2 mole Cu
This mole ratio is consistent with the balanced chemical equation, where 1 mole of Fe reacts with 2 moles of Cu(NO₃)₂ to produce 1 mole of Fe(NO₃)₂ and 1 mole of Cu. So, this ratio could be part of the chemical reaction.
B) 1 mole Fe(NO₃)₂ / 2 mole Cu
This mole ratio is also consistent with the balanced chemical equation, where 1 mole of Fe(NO₃)₂ is produced by reacting 2 moles of Cu(NO₃)₂. So, this ratio could be part of the chemical reaction.
C) 2 mole Cu(NO₃)₂ / 2 mole Fe
This mole ratio is consistent with the balanced chemical equation, where 2 moles of Cu(NO₃)₂ react to produce 2 moles of Fe(NO₃)₂. So, this ratio could be part of the chemical reaction.
D) 1 mole Fe(NO₃)₂ / 1 mole Fe
This mole ratio implies that 1 mole of Fe(NO₃)₂ is produced by reacting with 1 mole of Fe, which is not consistent with the balanced chemical equation. The equation shows that 1 mole of Fe reacts with 1 mole of Cu(NO₃)₂ to produce 1 mole of Fe(NO₃)₂ and 1 mole of Cu. Therefore, this ratio could NOT be part of the chemical reaction.
So, the correct answer is:
D) 1 mole Fe(NO₃)₂ / 1 mole Fe
To know more about iron (II) nitrate here
https://brainly.com/question/31428625
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which animal takes on the temperature of their surroundings and does not use food energy to keep warm
CAN SOMEBODY HELP ME WITH THIS QUESTION PLEASE !! ?
hope it helps you......
What would the final freezing point of water be if 3 mol of
sugar were added to 1 kg of water (Kx = 1.86°C/(mol/kg)
for water and i = 1 for sugar)?
A. -1.86°C
B. -5.58°C
C. -0.62°C
Ο Ο
D. +5.58°C
SUBMIT
Answer:
B. -5.58°C.
Explanation:
Hello!
In this case, since the freezing point depression is computed as follows:
[tex]\Delta T_f=-i*m*Kf[/tex]
Whereas i=1 as the van't Hoff's factor of sugar (nonionizing solute), m=3mol/1kg=3mol/kg as the molality and Kf=1.86 °C/(mol/kg) as the freezing point depression constant for water. In such a way, we plug in to obtain:
[tex]\Delta T_f=-1*3\frac{mol}{kg} *1.86\frac{\°C}{mol/kg} \\\\\Delta T_f=-5.58\°C[/tex]
Now, since the freezing point of pure water is 0°C, we infer that freezing point of such solution is:
B. -5.58°C.
Best regards!
Investigate: Press Reset. Start with 2.000 moles of sulfur, then press Start. How many atoms do you think this amount represents
Answer:
1.204428 * 10^24 atoms
Explanation:
Number of moles = 2 mol
Number of atoms = ?
The relationship between moles and atoms is given by the avogadro's umber. This is the number of units in one mole of a substance. The units can be atoms, ions etc In this case it is atoms. The number is equal to 6.02214076 * 10^23
This means;
1 mol = 6.02214076 * 10^23
2 mol = x
Upon solving for x,
x = 2 * 6.02214076 * 10^23
x = 12.04428 * 10^23
x = 1.204428 * 10^24 atoms
Which of the following describes light? (SELECT ALL THAT APPLY.)
A. Light passes through all objects.
B. Light is reflected off the surface of mirrors.
C. Light travels in a straight line.
D. Light waves behave in predictable ways.
Answer:
The light reflects twice before it finally exits the system. Draw a normal at the point of incidence to the first mirror; measure the angle of incidence (45 degrees); then draw a reflected ray at 45 degrees from the normal. Repeat the process for the second mirror.
Explanation:
Hope that helps!
How many electrons would Fluorine have to gain or lose to become stable?
Answer:
is most likely to gain one electron to form an ion with a 1- charge.
PLSASE HURRY I REALLY NEED IT
Consider this graph showing temperature over time. What would happen in the situation? The temperature decreases from 25° to 15°C, the material ____ heat and its kinetic energy ____ as the material, freezes to become a solid.
Answer:
One of the major effects of heat transfer is temperature change: heating increases the temperature while cooling decreases it. We assume that there is no phase change and that no work is done on or by the system. Experiments show that the transferred heat depends on three factors—the change in temperature, the mass of the system, and the substance and phase of the substance.
g line a) The emission line with the shortest wavelength. b) The absorption line with the shortest wavelength. c) The emission line with the lowest energy. d) The absorption line with the lowest energy. e) The emission line with the lowest frequency. f) The line corresponding to the ionization energy of hydrogen.
Answer:
a) 4
b) 2
c) 5
d) 2
e) 4
f) 3
Explanation:
The complete question is shown in the image attached to this answer.
We know that the shorter the wavelength, the greater the energy. The greatest energy and shortest wavelength among the emission lines is 4.
Applying the same argument as above, the greatest energy catapults the electron from energy level n=1 to n=4. This will corresponds to the shortest wavelength since energy is inversely proportional to wavelength.
Frequency is also inversely related to wavelength for two waves travelling at the same speed. Hence, the transition that corresponds to the highest energy and shortest wavelength in the emission spectrum will have the highest frequency.
The emission line with the lowest energy occurs when the electron moves from n=2 to n=1.
The ionization energy is the energy required to remove an electron from the hydrogen atom. It corresponds to the transition n=1 to n=∞
HELP??????..... Which type of semiconductor is created by doping with atoms that contain more valence electrons than the semiconductor material?
A. Intrinsic and p-type
B. Intrinsic
C. N-type
D. P-type
Answer:
Explanation:
N - type semi conductor
