If an atom has 10 protons, 10 neutrons, and 10 electrons, what is the mass of the atom?
Answer:
30
Explanation:
10+10+10 =30
..,,.............. . .... . .
whats the formula for
beryllium hypochlorite heptahydrate
Answer:
Beryllium Hypochlorite Be(ClO)2 Molecular Weight
a)The order of this ozone decomposition reaction is __________ order because __________.b)The rate constant for this ozone decomposition reaction is ______ (include units!)c)How many minutes will it take before half of the original ozone concentration ([O3]0) is depleted?
Answer:
a). Second order reaction.
b). [tex]$50.14\ Lmol^{-1}s^{-1}$[/tex]
c). [tex]$t_{1/2}=1994.41 \ h$[/tex]
Explanation:
a). The order of the reaction of ozone decomposition is second order reaction.
It will be second order because the plot between the Inverse of Concentration versus Time will be a straight line.
[tex]$\frac{1}{[A]}=\frac{1}{[A_0]}+kt$[/tex]
b). Calculating slope by
[tex]$y_0= 100000.000$[/tex]
[tex]$y_1= 952380.952$[/tex]
[tex]$\Delta y = 852380.9524$[/tex]
[tex]$x_0=0E+00$[/tex]
[tex]$x_1= 2E+04$[/tex]
[tex]$\Delta x = 2E+04$[/tex]
Slope, k = [tex]$\frac{\Delta y}{\Delta x}=50.14$[/tex]
Thus we see that the slope of the curve will be rate constant.
Therefore, rate constant = [tex]$50.14\ Lmol^{-1}s^{-1}$[/tex]
c). We know half life ,
[tex]$t_{1/2}=\frac{1}{k[A_0]}$[/tex]
[tex]$[A_0]=0.00001 \ mol/L$[/tex]
k = [tex]$50.14\ Lmol^{-1}s^{-1}$[/tex]
Putting the values, we get
[tex]$t_{1/2}=\frac{1}{50.14[0.00001]}$[/tex]
[tex]$t_{1/2}=1994.41 \ h$[/tex]
How does a neutral atom of magnesium form an ion?
Answer: The magnesium ion Mg2+ is formed when the magnesium atom loses the two electrons from its outer shell to form a stable ion with a noble gas configuration.
Explanation:
Dylan has two cubes of iron. The larger cube has twice the mass of the smaller cube. He measures the smaller cube. It’s destiny is 7.87 g/cm. What’s the larger cube’s volume?
Calculate the pH during the titration of 25.00 mL of 0.1000 M LiOH(aq) with 0.1000 M HI(aq) after 20.92 mL of the acid have been added.
Answer:
pH = 11.95
Explanation:
The reaction of LiOH with HI -Reaction of strongs bases and acids- is:
LiOH + HI → H₂O + LiI
The reaction of LiOH and HI is 1:1
The moles of LiOH and HI are:
Moles LiOH:
0.025L * (0.100mol / L) = 0.0025moles LiOH
Moles HI:
0.02092L * (0.100mol / L) = 0.002092moles HI
As moles of LiOH > Moles HI, after the addition of the acid, some LiOH remains, that is:
0.0025 moles - 0.002092 moles = 4.08x10⁻⁴ moles of LiOH
These moles are in 25mL + 20.92mL = 45.92mL = 0.04592L:
4.08x10⁻⁴ moles of LiOH / 0.04592L = 8.885x10⁻³M of LiOH = [OH⁻]
As pOH = -log[OH⁻]
pOH = 2.05
And pH = 14 - pOH
pH = 11.95The pH of the solution is 10.61
Data;
volume of LiOH = 25.0mL= 0.025Lconc. of LiOH = 0.1Mvolume of LiOH = 20.92mL =0.02092Lconc. of HI = 0.10MpH of the solutionTo calculate the pH of this solution, we have to find the excess moles of LiOH that reacted in the solution since it is a very strong base compared to HI.
The number of moles of LiOH can be found by multiplying the volume by the concentration of the base.
[tex]n = C*V \\n = 0.1*0.025 = 0.0025moles[/tex]
The number of moles of HI is
[tex]n = C*V\\n = 0.1*0.02092 = 0.002092moles[/tex]
The excess moles after reacting is
[tex]0.0025 - 0.002092 = 0.000408 moles[/tex]
Since this is the concentration of the base [OH-]
[tex][OH^-]=0.00408M[/tex]
The pOH of the solution is calculated as
[tex]pOH = -log[OH^-]\\pOH= -log[0.000408] = 3.39\\[/tex]
but pH + pOH = 14
[tex]pH + pOH = 14\\pH = 14 - pOH\\pH = 14 - 3.39\\pH = 10.61[/tex]
The pH of the solution is 10.61
Learn more on pH of a solution here;
https://brainly.com/question/13557815
7th grade Science pls help
Answer:
I think its a compound : )
The chart shows the movement of a ball after several seconds. A 2-column table with 4 rows. The first column labeled A has entries 0, 4, 8, 12, 16. The second column labeled B has entries 0, 2.5, 6, 8, 10. Column A is on the x-axis, and Column B is on the y-axis. Which titles should replace A and B? Column A should be “Time,” and Column B should be “Position.” Column A should be “Position,” and Column B should be “Time.” Column A should be “Velocity,” and Column B should be “Speed.” Column A should be “Speed,” and Column B should be “Velocity.”
Answer:
Problems1.10: Between each pair of vertebrae of the spine is a disc of cartilage of thickness 0.5 cm. Assume the disc has a radius of 0.04 m. The shear modulus of cartilage is 10 N/m2. A shear force of 10 N is applied to one end of the disc while the other end is held fixed. (a) What is the resulting shear strain? (b) How far has one end of the disc moved with respect to the other end
Answer:
the correct answer is A
Explanation:
Column A should be “Time,” and Column B should be “Position.”
I took the test and got it right with my big brain lol.
What tacks place in the cytoplasm
Answer:
In cell biology, the cytoplasm is all of the material within a cell, enclosed by the cell membrane, except for the cell nucleus. ... Most cellular activities take place within the cytoplasm, such as many metabolic pathways including glycolysis, and processes such as cell division.
Explanation:
hope this helps
Answer:
most Cellular activity takes place inside the cytoplasm of a cell like metallic pathways that includes glycolysis, and the processes like cell division.
Explanation:
Hope this helps!
The average kinetic energy of the molecules in a gas sample depends only on the temperature, . However, given the same kinetic energies, a lighter molecule will move faster than a heavier molecule, as shown in the equation for rms speed
rms speed=3ℳ⎯⎯⎯⎯⎯⎯⎯⎯⎯√
where =8.314 J/(mol⋅K) and ℳ is molar mass in kilograms per mole. Note that a joule is the same as a kilogram‑meter squared per second squared (kg·m2/s2).
What is the rms speed of Cl2 molecules at 413 K?
Answer:
12.1 m/s
Explanation:
Step 1: Given data
Molar mass of chlorine (M): 70.9 g/molIdeal gas constant (R): 8.314 J/(mol⋅K)Absolute temperature (T): 413 KStep 2: Calculate the root-mean-square speed of chlorine molecules
We will use the following expression.
rms-speed = √(3 × R × T/ M)
rms-speed = √(3 × 8.314 J/(mol⋅K) × 413 K/ 70.9 g/mol)
rms-speed = 12.1 m/s
In an element's square on the periodic table, the number with the greatest numerical value represents the
number of neutrons.
number of electrons.
atomic number.
atomic mass.
Answer: In an element’s square on the periodic table, the number with the greatest numerical value represents the (atomic mass).
Explanation: look at pic attached :
Arrange: Click Next element to select carbon. Add a second electron to the first 2p orbital.Click Check. What feedback is given?6. Rearrange: Hund’s rule states that electrons will occupy an empty orbital when it is available in that subshell. Rearrange the electrons within the 2p subshell and click Check.Is the configuration correct now?Show the correct configuration in the boxes at right:
Answer:
See explanation
Explanation:
The correct electronic configuration for carbon is;
1s2 2s2 2px1 2py1 2pz0
Carbon has six electrons in its outermost shell. According to Hund's rule, electrons will occupy all the empty orbitals when they are available in that subshell.
Hence, if you attempt to add a second electron the the first 2p orbital (2px), the arrangement of electrons will be flagged as incorrect. The other 2p electron must be added to the second 2p (2py) orbital.
Calculate the concentration of all ions present in each of the following solutions of strong electrolytes. 0.500 mole of Ca(NO3)2 in 800.0 mL of solution
Answer:
[Ca²⁺] = 0.625 M
[NO₃⁻] = 1.25 M
Explanation:
Step 1: Calculate the initial molar concentration of calcium nitrate
[Ca(NO₃)₂] = 0.500 mol / 0.8000 L = 0.625 M
Step 2: Write the reaction for the ionization of calcium nitrate
Calcium nitrate is a strong electrolyte that ionizes according to the following equation.
Ca(NO₃)₂(aq) ⇒ Ca²⁺(aq) + 2 NO₃⁻(aq)
Step 3: Calculate the concentrations of the ions
The molar ratio of Ca(NO₃)₂ to Ca²⁺ is 1:1. The concentration of Ca²⁺ is 1/1 × 0.625 M = 0.625 M.
The molar ratio of Ca(NO₃)₂ to NO₃⁻ is 1:2. The concentration of Ca²⁺ is 2/1 × 0.625 M = 1.25 M.
7th grade science.....
The answer is b
I had a test like this in 6th grade so i think im right not sure though but hopefully! :)
An atom of antimony has a mass number of 122. The atomic number of antimony is 51. Calculate the number of protons and neutrons in this atom – work must be shown to earn credit.
Answer:
The number of protons and neutrons of antimony is 51 and 71 respectively.
Explanation:
We have for antimony:
A: mass number = 122
Z: atomic number = 51
The atomic number is equal to the number of protons, hence the antimony has 51 protons.
The mass number is:
[tex] A = Z + N [/tex]
Where:
N: is the number of neutrons
Then, the number of neutrons is:
[tex] N = A - Z = 122 - 51 = 71 [/tex]
Therefore, the number of protons and neutrons of antimony is 51 and 71 respectively.
I hope it helps you!
What might cause mechanical weathering?
a
Acid rain
b
Violent earthquakes
c
Growing plants and expanding ice
d
Volcanic eruptions
Answer:
C.
Explanation:
In the cracks and pores of rocks, the force of its expansion is strong enough to split the rocks apart. This process is called Ice wedging, it can break apart huge boulders.
What is the formula for Sulfur Triphosphide? (3 points)
Answer:
SO3
Explanation:
If we plug equilibrium concentrations into the reaction quotient expression, we should be able to calculate:________
a. Qe
b. Qp
c. Ke
d. Kp
Answer:
C is the answer
Explanation:
and your welcome
How are ions made from neutral atoms?
Why?
O KATIE
yes
-
no
You have learned that not all atoms of an element are the same. Variation in the number of neutrons
results in different isotopes of the element. In this activity we will explore another variation that can take
place—the loss and gain of electrons. The exchange of electrons between atoms is a very common way for
chemical change to take place. We will see it many times throughout the year.
1. Use Model 1 to complete the following table.
see p. 2 for the model
Is the number of Is the number of Is the number of
Metal or protons the same panteons the same electrons the same
Charge
on the
Nonmetal in the atom in the atom in the atom
ion
and the ion? and the ion? and the ion?
Lithium
metal
no
1+
Magnesium
2+
Aluminum
yes
3+
Fluorine
1-
Oxygen nonmetal
Nitrogen
3-
2. Based on the table you completed in Question 1, what distinguishes a neutral atom from an ion?
Circle choice
Protons
Electrons
3. Examine the isotope symbols in Model 1.
a. Where is the ion charge located in the stope symbol?
Circle 2 choices: Top OR bottom + Left OR Right
be Is a charge indicated on the neutral atoms? If yes, where is it located?
No, charge is not indicated on an atom, because it is neutral
4. Which subatomic particle carries a positive charge?
no
2-
Inmut
Answer:
They can be turned into positive ions.
Explanation:
neutral atoms can be turned into positively charged ions by removing one or more electrons. Atoms that gain extra electrons become negatively charged. A neutral chlorine atom, for example, contains 17 protons and 17 electrons . By adding one more electron we get a negatively charged Ion with a net charge of negative 1
Barium melts at 725 degrees Celsius. What type of property is this?
Answer:
The answer is Physical
Answer:
physical property
Explanation:
Answer the question on top please with the picture choose either A or B
Which of the following correctly pairs a transition with its most closely associated region of the electromagnetic
spectrum?
Answer:
D
Explanation:
The vibration of molecules is studied using infrared spectroscopy. Infrared spectroscopy is used to study the various modes of vibration of a molecule.
Infrared spectroscopy is used to is used to identify various functional groups by observing their stretching frequencies.
For a molecule to be infrared active, the molecule must give rise to a change in the molecular electric dipole moment.
Calculate the pH for each of the given points in the titration of 50.0 mL of 2.1 M H3PO3(aq) with 2.1 M KOH(aq) g
Answer:
Explanation below
Explanation:
Titration can be explained or described as a process of combining acid and base to give salt and water, with the addition of indicator. In this experiment, the indicator is added in order to know the exact time when the required amount of the acid has reacted with the base.
This is process or experiment is also known as volumetric analysis.
Gases have no difinite volume and the least kinetic energy
O True
O False
Please answer rn
true gase doesn't have no definite volume
Calculate the energy of a photon from an FM radio station at a frequency of 101.5 MHz. Express the answer in scientific notation. Use the caret symbol (^) before the exponent. Use an x for the times sign. Include correct unit(s). Pay attention to sig figs. Space things normally and consistently. *
Answer:
[tex]E=6.7\times 10^{-26}\ J[/tex]
Explanation:
Given that,
The frequency of an FM radio station is 101.5 MHz i.e. [tex]101.5\times 10^6\ Hz[/tex]
The energy of a photon is given by :
[tex]E=h\nu[/tex]
Where
h is Planck's constant
[tex]E=6.63\times 10^{-34}\times 101.5\times 10^6\\\\E=6.72\times 10^{-26}\ J[/tex]
or
[tex]E=6.7\times 10^{-26}\ J[/tex]
So, the energy of the photon is [tex]6.7\times 10^{-26}\ J[/tex]. Hence, this is the required solution.
A mixture of gases contains 8.00 g of He, 29.96 g of Ar, and 48.00 g of O2. What is the mole fraction of He in this mixture
Answer:
0.47
Explanation:
Mole = Mass / Molar mass
Helium;
Mole = 8 / 4 = 2
Argon;
Mole = 29.96 / 39.95 = 0.75
Oxygen;
Mole = 48 / 32 = 1.5
Total mole = 2 + 0.75 + 1.5 = 4.25
Mole fraction = Mole of He / Total mole
Mole Fraction = 2 / 4.25 = 0.47
What mass of CO2 (in kilograms) does the combustion of a 16-gallon tank of gasoline release into the atmosphere? Assume the gasoline is pure octane (C8H18) and that it has a density of 0.70 g/mL.
Express your answer in kilograms to two significant figures.
Mass of CO₂ = 1.3 x 10⁵ kg
Further explanationA 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
2C₈H₁₈ + 25O₂⇒ 16CO₂ + 18H₂O
16 gallon = 60566,6 ml
mass C₈H₁₈ :[tex]\tt mass=\rho\times V\\\\mass=0.7\times 60566.6=42396.62~g[/tex]
mol C₈H₁₈ :[tex]\tt MW=114.232~g/mol\\\\mol=\dfrac{42396.62}{114.232}=371.145[/tex]
mol CO₂ :[tex]\tt \dfrac{16}{2}\times 371.145=2969.159[/tex]
mass CO₂ :[tex]\tt =2969.159\times 44(MW~CO_2)=130642.996~g=1.3\times 10^5~kg[/tex]
How many orbitals does the n = 4 shell have?
Answer:
16 orbitals
Explanation:
For n = 3 there are nine orbitals, for n = 4 there are 16 orbitals, for n = 5 there are 52 = 25 orbitals, and so on. To calculate the maximum number of electrons in each energy level, the formula 2n2 can be used, where n is the principal energy level (first quantum number).
Found this online. Hope it helps.
Global warming is heating the planet and sea ice is melting which causes sea levels to rise. What is another
factor that causes sea level rise that is also due to global warming? [Word Bank: Particle, Speed,
Collisions, Thermal Expansion, Space]
Answer:
Thermal Expansion
help pls i’ll give brainlest if it’s correct .
Answer:
that is going to be B the lower the energy of the electron