Answer:
Cs,Ba, Bi
Explanation:
Ionization energy increases across the period from left to right on the periodic table
The volume of a sample of hydrogen gas was decreased from 11.95 L to 5.24 L at constant temperature. If the final pressure exerted by the hydrogen gas sample was 9.31 atm, what pressure did the hydrogen gas exert before its volume was decreased?
Answer:
P1 = 21.23 atm
Explanation:
Initial Volume V1 = 11.95 L
Final Volume V2 = 5.24L
Final Pressure P2 = 9.31 atm
Initial Pressure P1 = x
The relationship between these values is given as;
P1 / V1 = P2 / V2
P1 / 11.95 = 9.31 / 5.24
P1 = 21.23 atm
The unbalanced equation below shows the combustion of methane.
CH4 +02 —CO2 + H2O
Which series of numbers represents the coefficients necessary to balance the equation?
A-1, 1, 1, 2
B-1, 2, 1, 2
C-2, 2, 1, 4
D-0, 3, 2, 2
The series of numbers 1, 2, 1, 2 represents the coefficients necessary to balance the equation of combustion of methane. Therefore, option (B) is correct.
What is the combustion reaction?A combustion reaction can be described as a reaction that produces fire and takes place at an elevated temperature. A combustion reaction is an exothermic, redox reaction that occurs between a fuel and mostly oxygen in the atmosphere.
Oxygen is the most important part of the combustion reaction because combustion never happens in the absence of oxygen. Complete combustion is the one where a fuel burns entirely to produce carbon dioxide and heat with oxygen.
The combustion of methane reacts with two moles of oxygen gas to give two moles of water and carbon dioxide.
CH₄ (g) + 2O₂ (g) → CO₂ (g) + 2H₂O (g)
Therefore, the series of numbers of coefficients is 1, 2, 1, 2.
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At a constant temperature, which of the gases will have the highest average
kinetic energy?
A) H2
B) N2
C) O2
D) F2
E) All the gases will have the same average
kinetic energy.
H₂ will have the highest average kinetic energy
Further explanationEnergy because this motion is expressed as Kinetic energy (KE) which can be formulated as:
[tex]\tt \displaystyle KE=\frac{1}{2}mv^2[/tex]
Average velocities of gases can be expressed as root-mean-square averages. (V rms)
[tex]\large{\boxed{\bold{v_{rms}=\sqrt{\frac{3RT}{Mm} } }}[/tex]
R = gas constant, T = temperature, Mm = molar mass of the gas particles
From the two equations above, it can be concluded
KE is directly proportional to gas velocity Gas velocity is inversely proportional to molar massSo the highest KE is owned by the gas with the smallest molar mass
Molar mass of the gas :
A) H₂ : 2 g/mol
B) N₂ : 28 g/mol
C) O₂ : 32 g/mol
D) F₂ : 38 g/mol
So H₂ has the highest average kinetic energy
At a constant temperature: E. All the gases will have the same average kinetic energy.
According to the kinetic-molecular theory, the average kinetic energy of gas molecules (particles) is highly dependent on temperature.
Hence, the average kinetic energy of gas molecules (particles) is directly proportional to the absolute temperature of the gas.
At a constant temperature, all gases would have the same average kinetic energy according to the kinetic-molecular theory of gases.
In conclusion, all the gases would have the same average kinetic energy since the temperature is constant.
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A sample is found to contain 2.98x10^-10 g of salt. Express this quantity in nanograms.
This quantity = 0.298 nanograms(ng)
Further explanationMass is one of the principal quantities, which is related to the matter in the object
The main mass unit consists of 7 units of other than other units of mass such as quintals, tons, pounds, ounces:
Kilogram, kg
Hectogram, hg
Decagram, dag
gram, g
Desigram, with
centigram, cg
milligram, mg
Each unit descends then multiplied by 10, and if one unit increases then divided by 10
Conversion of other mass units:
10⁻³ g ⇒mg-milligrams
10³ g ⇒kg-kilograms
10⁻⁶ g ⇒µg-micrograms (mcg)
10⁶ g ⇒Mg-megagrams (tons)
10⁻⁹ g ⇒ng-nanograms
10⁹ g ⇒Gg-gigagram
10⁻¹² g ⇒pg-pikogram
2.98 x 10⁻¹⁰ g to nanograms(ng)
[tex]\tt 2.98\times 10^{-10}\times 10^9=0.298~ng[/tex]
The half life of radium-226 is 1600 years.
a. After how many half-lives would 25% of the radium-226 remain.
b. Write a function m(t) that models the mass remaining after years.
c. How much of the sample will remain after 3000 years?
d. After how long will only 15 mg of the sample remain?
Answer:
Explanation:
a )
half life = 1600 years
50% in 1600 years
25% in next 1600 years
so 25% in total of 3200 years .
b )
disintegration constant = .693 / half life
= .693 / 1600
λ= 4.33 x 10⁻⁴ year⁻¹
m(t) = [tex]m_0e^{-\lambda t }[/tex]
m₀ is initial mass , λ = 4.33 x 10⁻⁴ year⁻¹
c )
m(t) after 3000 years , t = 3000
m(t) = [tex]m_0e^{-4.33\times10^{-4 }\times 3000 }[/tex]
= [tex]m_0e^{-1.3}[/tex]
= .2725 m₀
percentage of mass remaining = 27.25 %
25% radium-226 remain after 3200 years. 6.82 mg of sample remains after 3000 years. 15 mg of the sample will stay long about 1179. 19 years.
Half life of radium-226 = 1600 years
What is half-life?
half-life, in radioactivity, the interval of time required for one-half of the atomic nuclei of a radioactive sample to decay.
Calculation of each part can be done as
a )
half-life = 1600 years
50% in 1600 years
25% in next 1600 years
so 25% in total of 3200 years .
b )
Let decay function is
[tex]m(t) = m_o e^{-kt} \ \ \ \ \ ...(i)\\[/tex]
where k is decay constant
At half life,
[tex]m(t) = \frac{m_o}{2},t= 1600\ years\\So,\ \frac{m_o}{2} = m_oe^{-k1600}\\\frac{1}{2} = e^{-k1600}\\[/tex]
applying log on both sides
[tex]ln \frac{1}{2} = lne^{-1600k}\\-0.693147 = -1600 k \\k =\frac {0.693147}{1600}\\k = 4.332\times10^{-4}\\[/tex]
substitute the value of k in equation (i)
[tex]m(t) = m_oe^{-4.332\times10^{-4t}}\\m(t) = 25e^{-0.0004332t}[/tex]
c) when t = 3000 years
[tex]m(t) = 25e^{-0.0004332t}[/tex]
[tex]m(3000) = 25e^{-0.0004332\times3000}[/tex]
remain sample after 3000 years = 6.82 mg
d) when m(t) = 15 mg
[tex]15 = 25e^{-0.0004332t}\\e^{-0.0004332 t} = \frac{15}{25}\\applying\ log\ on\ both\ side\\ln \ e^{-0.0004332t}=ln(\frac{15}{25)}\\-0.0004332t = -0.510825\\t=\frac{0.510825}{0.0004332}\\t= 1179.19 \ years[/tex]
Hence, this is the required answer.
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Which of these electron transitions correspond to absorption of energy and which to emission?
a. n = 5 to n = 6 absorption emission
b. n = 9 to n = 6 absorption emission
c. n = 6 to n = 4 absorption emission
d. n = 6 to n = 7 absorption emission
Answer:
n = 5 to n = 6 absorption
n = 9 to n = 6 emission
n = 6 to n = 4 emission
n = 6 to n = 7 absorption
Explanation:
According to the Bohr's model of the atom. An electron in an atom may absorb energy and move from a lower energy level to a higher energy level. This requires absorption of energy that is equal to the energy difference between the two levels.
Similarly, an electron may move from a higher to a lower energy level, releasing energy that is equal to the energy difference between the higher and the lower level. This is known as emission.
Hence, if the electron is moving from a lower energy level to a higher energy level, an absorption has taken place, e.g n = 5 to n = 6
When an electron moves from a higher energy level to a lower energy level, an emission has taken place e.g n = 9 to n = 6
Hydrochloric acid is widely used as a laboratory reagent, in refining ore for the production of tin and tantalum, and as a catalyst in organic reactions. Calculate the number of moles of HCI in 62.85 mL of 0.453 M hydrochloric acid.
1) 28.5 mol
2) 1.04 mol
3) 0.139 mol
4) 0.0285 mol
5) 0.00721 mol
Answer:
Option 4
Explanation:
Hydrochloric acid is a strong one, that gives protons to medium. It can be dissociated as this:
HCl → H⁺ + Cl⁻
M means Molarity. It is a sort of concentration that indicates the moles of solute in 1L of solution.
M = moles / volume (L)
We can also say M = mmoles / mL of solution
M . mL = mmoles
0.453 M . 62.85mL = 28.5 mmoles
If we divide by 1000 → 28.5 mmol . 1 mol / 1000 mmol = 0.0285
What are the moles of silver metal produced from 0.0999 mol of copper?
_Cu(s)+_AgNO3(aq) -> _Cu(NO3)2(aq)+_Ag(s)
Answer:
1234567i9812345678912121212121
There is a structure of CH3CH2CHCHCH2CH3, with a –CH2CH3 group attached to the third and fourth carbons.
Spell out the full name of this compound
Explanation:
2,3-diethyl hexane
At first we select a long chain.
Then, we number that chain from that side where substituent position is closer.
Then, we write it's IUPAC name
Position of substituent + substituent name + chain name + suffix
Here,
2,3 + -diethyl + hex + -ane
= 2,3-diethyl hexane
In Bohr model N3 moves up to N 4 the electron occupies distinct energy states where energy is absorbed or emmitted
Answer:
vkhcohvoccf
uxihfoydohfufyfocidicicugxigdixifxtxtduration jfhgxfcixig
cigcih
Explanation:
cihcohcohccohcjjcofidytstitddgggxogxxtdrrtteeeeeiiiixiiitttdooodooxyక్సజిఫ్స్ట్టిగ్గ్స్గ్డ్గ్
As you move from N to Bi, the metallic properties of the element
A. increases.
C. remains the same.
B. decreases.
D. does not follow a trend.
Answer:
b. decreases
Explanation:
i just took a test on it
As you move from N to Bi, the metallic properties of the element decrease. The correct option is B.
What are nitrogen and bismuth?Nitrogen is a chemical element, whose chemical element is N. Nitrogen is a gas and its atomic number is 7. It is a non-metal and is present in group 15 of the periodic table.
Bismuth is a chemical element, whose chemical element is Bi. It is a post-transition metal, and it is also present in group 15 of the periodic table near arsenic and antimony. Its atomic number is 83.
Now, nitrogen and bismuth are present in the same line and group. Nitrogen is the first element of the group and going down, there is bismuth present in the group last. So the metallic property decreases from going down the group.
Thus, the correct option is B. decreases.
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Be sure to answer all parts. How many moles of O are needed to combine with 0.276 mole of C to form CO
Answer:
0.138 moles of oxygen are needed to combine with 0.276 moles of carbon.
Explanation:
Given data:
Moles of oxygen needed = ?
Moles of carbon present = 0.276 mol
Solution:
Chemical equation:
2C + O₂ → 2CO
Now we will compare the moles of carbon with oxygen.
C : O₂
2 : 1
0.276 : 1/2×0.276 = 0.138 mol
Thus, 0.138 moles of oxygen are needed to combine with 0.276 moles of carbon.
BRAINLIEST + 20 POINTS
How many atoms of Na would react with 1 mole of water?
2Na + H2O --> 2NaOH + H2
A. 2.408 x 10^23
B. 1.204 x 10^24
C. 2.408 x 10^24
D. 1.204 x 10^23
Answer:
The answer is C (filler)
Answer: b hope im not wrong
Explanation:
Dora rolled a marble down a ramp and recorded the potential energy and kinetic energy of the marble at different positions on the ramp, as shown in the table.
Marble experiment
Height of
Marble from Ground (meters) Potential Energy of
Marble (Joules) Kinetic Energy of
Marble (Joules) Total Energy of
Marble (Joules)
Trial 1 1 2 4 6
Trial 2 2 4 2 6
Which is the constant variable in this experiment?
Mass of marble
Kinetic energy of marble
Potential energy of marble
Height of marble from ground
Answer:
I believe it is Mass of marbles this may be wrong
Explanation:
Answer:
b
Explanation:
A solution containing only Ba(OH) 2 in water has a pH of 13.9. What is the molar concentration of barium hydroxide in the solution?
a. 1.4 M
b. 0.70 M
c. 0.020 M
d. 0.040 M
e. 0.40 M
Answer:
The correct answer is e. 0.40 M
Explanation:
Ba(OH)₂ is a strong base, so it is completely dissociated into ions in aqueous solution:
Ba(OH)₂ → Ba²⁺ + 2 OH⁺
We know that pH + pOH = 14. Thus, we can calculate pOH as follows:
pOH = 14 - pH = 14 - 13.9 = 0.1
According to the definition, pOH = - log [OH⁻]. So, we calculate the concentration of OH⁻:
[OH⁻] = [tex]10^{-pOH}[/tex] = [tex]10^{-0.1}[/tex] = 0.79 M
Since, the dissociation equilibrium of Ba(OH)₂ shows that there are 2 moles of OH⁻ per mole of Ba(OH)₂, the concentration of Ba(OH)₂ is:
[Ba(OH)₂]= [OH⁻]/2 = 0.79 M/2= 0.397 M ≅ 0.4 M
How many moles of H are present in 3 moles of carbon trihydride?
a. 3
b. 12
c. 6
d. 9
Answer:
answer is b.12
Explanation:
Question 1 (1 point)
A chemical reaction is when substances are changed into other substances.
True or False
Explain why HCl can be a strong electrolyte, but a dilute HCl solution can be a poor conductor?
Answer:
Because as the concentration is diminished, the capacity to transfer electricity is diminished as well.
Explanation:
Hello!
In this case, since electrolytes are substances that are able to conduct the electricity in aqueous media (solutions in which water is the the solvent) because they have the capacity to form ions with both positive and negative charges, due to the fact that HCl is a strong acid, we notice it is fully ionized in solution and therefore it is a strong electrolyte. However, when the concentration is diminished, we can notice that strength is diminished as well because less ions will have the capacity to transfer the electricity and therefore it'd become a poor conductor or weak electrolyte.
Best regards!
very
Which of the
following mineral
characteristics are
associated with
gold?
A. it is a compound
B. it is made of many elements
C. it is man made
D. it is a solid
Answer:
D,B
Explanation:
there are 79 elements in gold
12. Calculate the molecular weight.
a. Sodium Chloride (NaCl)
b. Magnesium sulphate (MgSo.)
A sample of compound contains 5.65x10 21 molecules molar mass of the compound is 89.06g/ mol determine the mass of the sample in grams
Answer:
Explanation:
no of molecules=5.65*10^21
NA=6.23*10^23
no of moles=no of molecules/avogadro number
no of moles=5.65*10^21/6.23*10^23
no of moles=9.07*10^-3
now we know that
no of moles=mass/molar mass
mass=no of moles*molar mass
mass=9.07*10^-3*89.06
mass=0.808 g
What amount of moles of sodium chloride is needed to prepare 1.25 L of a salt solution with a concentration of 0.750 mol/L
Answer:
Number of moles = 0.94 mol
Explanation:
Given data:
Number of moles of sodium chloride = ?
Volume of sodium chloride = 1.25 L
Concentration of solution = 0.750 mol/L
Solution:
Formula:
Concentration = number of moles/ volume in L
By putting values.
0.750 mol/L = number of mole / 1.25 L
Number of moles = 0.750 mol/L×1.25 L
Number of moles = 0.94 mol
What temperature (in °C) did an ideal gas shift to if it was initially at -10.0 °C at 4.62 atm and 35.0 L and the pressure was changed to 8.71 atm and the volume changed to 15.0 L
Answer:
-251.9°C
Explanation:
Given data:
Initial volume = 35.0 L
Initial pressure = 4.62 atm
Initial temperature = -10.0 °C (-10.0 +273 = 263.0 K)
Final temperature = ?
Final volume = 15.0 L
Final pressure = 8.71 atm
Solution:
According to general gas equation:
P₁V₁/T₁ = P₂V₂/T₂
Now we will put the values,
4.62 atm × 35.0 L / 263.0 K = 8.71 atm × 15.0 L /T₂
T₂ = 8.71 atm × 15.0 L × 263.0 K / 4.62 atm × 35.0 L
T₂ = 34360.95 atm.L.K /161.7 atm.L
T₂ = 21.26 K
Kelvin to °C:
21.26 - 273.15 K = -251.9°C
An object accelerates 8.2 m/s2 when a force of 20.1 Newton's is applied to it. What is the mass of the object?
We are given:
Acceleration of the object (a) = 8.2 m/s²
Force applied on the object (F) = 20.1 newtons
Mass of the object (m) = m kg
Solving for the mass of the object:
From newton's second law of motion:
F = ma
replacing the variables
20.1 = m * 8.2
m = 20.1/8.2
m = 2.45 kg
Hence, the object weighs 2.45 kg
state Graham's law diffusion of gas mathematical expression ?
Answer:
Graham's law states that the rate of diffusion or of effusion of a gas is inversely proportional to the square root of its molecular weight
Explanation:
20 POINTS!!
1. 14.07g of solid sucrose (C12H22O11) are dissolved in 0.35 L of water. What is the molarity of the solution?
2. What is the molarity of a sucrose solution with a concentration of 4.5 ppm (mg/L)?
3. What is the molarity of the same sucrose solution if you dilute 40 mL of it into a 500 mL volumetric flask?
Answer:
1. molarity is = 0.1174
2. molarity is = 9.3
3. molarity is =0.009392
Explanation:
Q#1.
mass of sucrose is 14.07g
molar mass of sucrose is 342 3g/mol
so, 14.07x1/342.3 = 0.0411
now the volume is of water is 0.35
so, 0.0411/0.35 = 0.1174
Q#2.
concentration is 4.5
so, 4.5x1/1000= 0.0045
then, 0.0411/0.0045 = 9.13
Q#3.
M1M1=M2M2
molarity of the same sucrose is 0.1174
so, diluted in 40mL
and the volumetric flask is 500mL
so, 0.1174x40/500= 0.009392
Which is the Lewis structure for H3PO4? An upper P is single bonded above to an O, and to the left, right, and below to an O single bonded to an H. The O above the P has three pairs of dots to the left, above, and below; the O's to the sides have pairs of dots above and below, and the O below the P has pairs of dots right and left. A central upper P is single bonded left, right, above, and below to upper Os. The O above the P is single bonded to upper H on the left and the right, and has two electron dots above it. The O below the P is single bonded to an H below, and has pairs of electron dots to the left and right. A central upper P is double bonded to an O above, and single-bonded to an upper O single-bonded to an upper H to the left and the right. The O above the P has three pairs of electron dots, to the left, above, and to the right; the O's to the right and left have pairs of dots above and below. A central upper P is bonded to an upper H above, an upper O below, and upper O's bonded to upper H's to the left and the right. The O below the P has three pairs of electron dots, to the left, right, and below; the other two O's have pairs of dots above and below. A central upper P is double bonded to an O above, and single-bonded to an upper O single-bonded to an upper H to the left and the right. The O above the P has three pairs of electron dots, to the left, above, and to the right; the O's to the right and left have pairs of dots above and below.
Answer:
It is A.
Explanation:
I took the test.
The Lewis structure shows the arrangement of valence electrons in H3PO4.
The Lewis structure gives us a picture of the number of valence electrons in a molecule. This is because, in a Lewis structure, the electrons in the molecule are shown as dots. A single line may be used to show shared electrons in a covalent bond.
The correct Lewis structure of H3PO4 is an upper P is single bonded above to an O, and to the left, right, and below to an O single bonded to an H. The O above the P has three pairs of dots to the left, above, and below; the O's to the sides have pairs of dots above and below, and the O below the P has pairs of dots right and left.
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Explain on the chemical structural basis why the products of the saponification reaction are soluble in water while the starting triglyceride is insoluble in water.
Answer:
The description is outlined in subsection downwards and according to the query given.
Explanation:
Saponification seems to be a procedure that requires the conversion or transformation of fat, grease, or lipid by either the intervention of heating a mixture of aqueous alkali towards soap as well as an alcoholic. Soaps contain fatty acid salts, however, mono-fatty acids contain carbon atoms, such as sodium palmitate. Therefore, throughout the water, individuals were indeed soluble. However, on another hand, owing to large hydrocarbon strings, triglycerides do not partake in hydrogen bonding. Therefore in water, they aren't dissolved.The solubility of a soap is due to the hydrophilic head which interacts with water.
A triglyceride is a compound that is based on propane 1,2,3 - triol where all the -OH groups have been replaced with fatty acid chains. The triglycerides are insoluble in water because it contains a long alkyl chain which does not interact with water.
However, a soap is a salt of a glyceride having a hydrophilic head and a hydrophobic tail. The hydrophilic head is responsible for the solubility of the soap in water.
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Which body system moves oxygen into the blood and removes carbon dioxide from the blood?
Answer:The respiratory system
Explanation:
is the network of organs and tissues that help you breathe. It includes your airways, lungs, and blood vessels. The muscles that power your lungs are also part of the respiratory system. These parts work together to move oxygen throughout the body and clean out waste gases like carbon dioxide.
Respiratory system moves oxygen into the blood and removes carbon dioxide from the blood.
What is respiratory system?Respiratory system is defined as a biological system which consists of specific organs structures which function for gaseous exchange in plants as well as animals.
The physiology of the system varies greatly depending on size of organism , its environment and evolution. In animals residing on land, the respiratory organs are the lungs . In lungs gas exchange takes place through the alveoli which are small air sacs . They have rich blood supply which brings air in close contact with the blood.
In aquatic animals, respiratory system consists of gills .Gas exchange takes place through gills which consist of thin or very fine filaments and lamellae. In amphibians respiration takes place through skin.
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This table shows four species of plants, with descriptions. Which species are most likely vascular? the bracken and the bog groove moss the thallose liverwort and the bog groove moss the bracken and the lemon tree the thalose liverwort and the lemon tree Mark this and return
Answer:
it is b
Explanation:
i just took test b
Answer:
C maneeeee
:)
Explanation:
