Answer: i think its A
Explanation:
Answer:
A
Explanation:
Becuase bubbles only come from chemical changes
A chemist determines by measurements that 0.030 moles of hydrogen gas participate in a chemical reaction. Calculate the mass of hydrogen gas that participates. Be sure your answer has the correct number of significant digits.
Answer:
0.060 g
Explanation:
Hydrogen gas is made up of 2 atoms of hydrogen [tex]H_2(g)[/tex].
From the formula for calculating mole:
mole = mass/molar mass
Molar mass of hydrogen gas = 2.016 g/mol
Hence, 0.030 mole hydrogen gas would weigh:
mass = molar mass x mole
= 2.016 x 0.030
= 0.06048 g
The mass of hydrogen gas that participated to the correct number of significant digits is, therefore, 0.060 g
The second-order reaction CH3CHO→CH4+CO has the reaction constant k of 6.73×10−5 L/mol s. If the initial concentration of CH3CHO is 0.551 mol/L, what is the concentration of CH3CHO after 45.0 seconds? Your answer should have 3 significant figures (three decimal places).
Answer:
[tex][CH_3CHO]=0.550M[/tex]
Explanation:
Hello.
In this case, since the rate law for this chemical reaction would be:
[tex]r=\frac{d[CH_3CHO]}{dt} =-k[CH_3CHO]^2[/tex]
The integrated rate law after its demonstration is:
[tex]\frac{1}{[CH_3CHO]} =kt+\frac{1}{[CH_3CHO]_0}[/tex]
Thus, for the given rate constant, initial concentration of CH3CHO and elapsed time, the resulting concentration is:
[tex]\frac{1}{[CH_3CHO]} =6.73x10^{-5}\frac{L}{mol*s}*45.0s +\frac{1}{0.551mol/L}\\\\\frac{1}{[CH_3CHO]}=3.03x10^{-3}L/mol+1.81L/mol[/tex]
[tex]\frac{1}{[CH_3CHO]} =1.82L/mol[/tex]
[tex][CH_3CHO]=0.550M[/tex]
Best regards!
What is A Chemical Bond- ASAP!
Answer:
B.
Explanation:
A chemical bond holds together attractions of atoms
How much heat is required to change 150.0 g of water from 21.0 °C to 45.0°C
Answer:
When it asks how much heat it is required to change the temperature then it is called specific heat capacity, and when it says how much heat required TO CHANGE THE STATE then it is latent heat so here we will do by formula of
Q = mcT
where q is heat
m is mass
T is change in temperature which is going to be 24 here
put all the values you will get the answer
HOPE IT HELPS!
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.
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 :
Assign the oxidation states of all the atoms in each of the following compounds. a) H2CrO4 b) H2SO4 c) K2Cr2O7 d) HNO3 e) Cr2O7 2
Answer:
(a) H = +1, Cr = +6, O = -2
(b) H = +1, S = +6, O = -2
(c) K = +1, Cr = +6, O = -2
(d) H = +1, N = +5, O = -2
(e) Cr = +6, O = -2
Explanation:
(a)
In H₂CrO₄
The oxidation state of Hydrogen (H) is +1
The oxidation state of Oxygen (O) is -2
To find the oxidation state of Cr,
Let the oxidation state of Cr be x
Then, (+1×2) + x + (-2×4) = 0
2+x-8 = 0
x = +6
Hence, oxidation state of Cr is +6
(b)
In H₂SO₄
The oxidation state of Hydrogen (H) is +1
The oxidation state of Oxygen (O) is -2
To find the oxidation state of Sulphur (S),
Let the oxidation state of Sulphur be x
∴ Then, (+1×2) + x + (-2×4) = 0
2+x-8 = 0
x = +6
Hence, the oxidation state of S is +6
(c)
In K₂Cr₂O₇
The oxidation state of Potassium (K) is +1
The oxidation state of Oxygen (O) is -2
To find the oxidation state of Chromium,
Let the oxidation state of Chromium be x
Then, (+1 ×2) + (x ×2) + (-2×7) = 0
+2 +2x -14 = 0
2x = +12
x = +6
Hence, the oxidation state of Chromium is +6
(d)
In HNO₃
The oxidation state of Hydrogen (H) is +1
The oxidation state of Oxygen (O) is -2
To find the oxidation state of NItrogen (N),
Let the oxidation state of Nitrogen be x
+1 + x + (-2×3) = 0
1 +x - 6 = 0
x = +5
Hence, the oxidation state of Nitrogen is +5
(d)
In Cr₂O₇²⁻
The oxidation state of Oxygen is -2
To the oxidation state of Chromium (Cr(,
Let the oxidation state of Chromium be x
Then, (2×x) + (-2×7) = -2
2x - 14 = -2
2x = +12
x = +6
Hence, the oxidation state of Chromium is +6
What are some things that you can do to reduce your impact on desertification?
Answer:
Planting more trees - the roots of trees hold the soil together and help to reduce soil erosion from wind and rain.
Improving the quality of the soil - this can be managed by encouraging people to reduce the number of grazing animals they have and grow crops instead. The animal manure can be used to fertilise the crops grown. Growing crops in this way can improve the quality of the soil as it is held together by the roots of plants and protected from erosion. This type of farming is more sustainable.
Water management - water can be stored in earth dams in the wet season and used to irrigate crops during the dry season. This is an example of using appropriate technology to manage water supplies in the desert environment.
Explanation:
Barium melts at 725 degrees Celsius. What type of property is this?
Answer:
The answer is Physical
Answer:
physical property
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
Help!!! A radio station transmits its signal at 93.1 MHz. What is the wavelength signal ?
Answer:
3.22m
Explanation:
c=3×10^8m/s=speed of the light
lambda= wavelength=?
frequency=?
lambda=c÷frequency
lambda=(3×10^8)÷(93.1×10^6)
lambda=3.22m
What are the three categories of carbohydrates in
food ingredients?
Answer:
1. simple carbohydrates or simple sugars such as table sugar and the sugar in milk, 2. complex carbohydrates such as starches and 3. dietary fiber.
Explanation:
If you help me i will give bra1niest. Guaranteed
Answer:lll
I looked and lll is the only one that wont make since so it’s lll
7th grade Science pls help
Answer:
I think its a compound : )
A friend uses an analogy of raisins in rising bread dough to describe galaxies in the expanding universe. Is your friend’s analogy strong? Explain.
*
Malleability refers to the ability of a metal to...
be drawn into a wire
conduct electricity
be melted down to create alloys
O be hammered into shapes
Answer:
It would be to be hammered into shapes because malleability is how flexible a metal is.
help pls i’ll give brainlest if it’s correct .
Answer:
that is going to be B the lower the energy of the electron
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.
HELP ME For which orbital are the values of the quantum numbers as
follows: n = 2, 1 = 1, m = -1,0, +1 ?
Answer: 2p..........................
Answer:
2p
Explanation:
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.
Suppose you mix 100.0 g of water at 23.0 oC with 75.0 g of water at 75.7 oC. What will be the final temperature of the mixed water, in oC? Type answer:
Answer:
Explanation:
Let final temperature be T.
Heat lost by hot water
mass x specific heat x fall in temperature
75 x s x ( 75.7 - T )
Heat gained by cool water
= 100 x s x ( T - 23 )
heat lost= heat gained
75 x s x ( 75.7 - T ) = 100 x s x ( T - 23 )
5677.5 - 75 T= 100 T- 2300
175 T= 7977.5
T = 45.6⁰C .
The final temperature of the mixed water is 45.6 ⁰C.
The given parameters;
mass of the cold water, m = 100 ginitial temperature of the water, t₁ = 23 ⁰Cinitial temperature of the hot water, t₂ = 75.7⁰ Cmass of the hot water = 75 gspecific heat capacity of water is 4.184 J/g⁰CThe final temperature of the mixture is calculated as follows;
Based on the principle of conservation of energy;
Heat lost by hot water = heat gained by the cold water
mcΔθ₂ = mcΔθ₁
75 x 4.184 x (75.7 - T) = 100 x 4.184 x (T - 23)
75 x (75.7 - T) = 100 x (T - 23)
(75.7 - T) = 1.333(T - 23)
75.7 - T = 1.333T - 30.659
75.7 + 30.659 = 1.333T + T
106.359 = 2.333T
[tex]T = \frac{106.359}{2.333} \\\\T = 45.6 \ ^0C[/tex]
Thus, the final temperature of the mixed water is 45.6 ⁰C.
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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.
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!
A photon of red light has wavelength 750 nm, a photon of
green light has wavelength 615 nm and a photon of violet light
has wavelength 420 nm. Which of the following radiations
has/have higher frequency?
Answer:
violet light
Explanation: ck12 says so
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
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.
An ideal gas is confined to a 10.0-L balloon at STP. What is
the new volume of the balloon when it is placed under
800. mmHg at 100°C?
Answer:
[tex]V_2= 13.0L[/tex]
Explanation:
Hello.
In this case, we can consider this problem related to ideal gases which are those that are not attracted or repulsed to each other, and can be studied via the ideal gas equation:
[tex]PV=nRT[/tex]
Thus, since we have two conditions and the moles of the gas have not changed, we can write:
[tex]\frac{P_1V_1}{T_1}= \frac{P_2V_2}{T_2}[/tex]
Because the initial conditions for 10.0 L of the gas are 1 atm and 273.15 K (STP) and the final conditions are 800 mmHg (1.053 atm), so the new volume is:
[tex]V_2=\frac{P_1V_1T_2}{T_1P_2}=\frac{1atm*10.0L*373.15K}{273.15K*1.053atm}\\\\V_2= 13.0L[/tex]
Best regards!
When the balloon placed under 800. mmHg, the new volume will be "13.0 L".
Ideal gas equationAccording to the question,
Pressure, P₁ = 1 atm
P₂ = 1.053 atm
Temperature, T₁ = 273.15 K
T₂ = 373.15 K
Volume, V₁ = 10.0 L
By using the Ideal gas equation,
→ PV = nRT
or,
→ [tex]\frac{P_1 V_1}{T_2} = \frac{P_2 V_2}{T_2}[/tex]
Then,
The new volume be:
→ V₂ = [tex]\frac{P_1 V_1 T_2}{T_1 P_2}[/tex]
By substituting the above values,
= [tex]\frac{1\times 10.0\times 373.15}{273.15\times 1.053}[/tex]
= 13.0 L
Thus the approach above is right.
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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.
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]
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]
