What happens during radioactive decay?
A. An unstable nucleus loses particles until it becomes stable.
B. An unstable nucleus gains neutrons to make it stable.
C. An unstable nucleus gains mass until it becomes stable.
D. An unstable nucleus absorbs radiation to make it stable.
Answer:
When a radioactive atom undergoes a nuclear decay event (the significant decay modes are alpha decay, beta decay, electron capture, and spontaneous fission), the decaying nucleus undergoes a transformation in identity associated with the change in the number of protons in the nucleus
A sample of nitrogen gas expands in volume from 16 L to 5.4 L at constant
temperature. Calculate the work done in joules if the gas expands (a) against
a vacuum, (b) against a constant pressure of 0.80 atm.
Please answer if yk
a. W = 0 J
b. W = - 308.028 J
Further explanationGiven
Nitrogen gas expands in volume from 1.6 L to 5.4 L
Required
The work done
Solution
Isothermal :
W = -P . ΔV
Input the value :
a. At a vacuum, P = 0
So W = 0
b. At pressure = 0.8 atm
W = - 0.8 x ( 5.4 - 1.6)
W = -3.04 L.atm ( 1 L.atm = 101.325 J)
W = - 3.04 x 101.325
W = - 308.028 J
Which statements describe sedimentary rock? Check all that apply,
It comes from older rocks.
It forms from sediments.
It is one of the three main types of rocks.
It comes from materials that never existed before.
It can form from materials solidified from solutions,
Answer:
EDG 2020
Explanation:
It comes from older rocks,It forms from sediments,it is one of the main 3 rocks, con form from materials solidified from solution.
Answer:
It comes from older rocks.
It forms from sediments.
It is one of the three main types of rocks.
It can form from materials solidified from solutions,
Explanation:
What is the
Electronegativity of sugar
The electronegativity of sugar molecule is the the ability of an atom to attract an electron pair towards itself which is shared with another atom in a chemical bond.
What is electronegativity?Electronegativity is defined as the ability of an atom to attract an electron pair towards itself when share an electron or electrons with another atom in a chemical bond.
This electronegativity occurs between the atoms which made covalent bond with one another. Sugars also contain covalent bonds because all the covalent bonds in sugar molecules arise as a result of electron sharing between the atoms.
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What is a combination of two or more substances that are all solids
Answer:
Solids cant react to each other because they are the same room temperature
Answer:
A is the correct answer.
Explanation:
A mixture of solids is the correct answer.
An unknown Group 1 metal carbonate, M2CO3, was reacted with excess 2 M HClThe initial mass was 2.002 g of M2CO3and the mass of CO2released was 1.206 g.a) Write a balanced chemical equation for this reaction.
Answer:
The balanced equation of the reaction is given as follows:
M₂CO₃ + 2HCl ---> 2MCl + H₂O + CO₂
The mole ratio of the metallic carbonate to carbon (iv) oxide is 1:1
The metal is Lithium
Explanation:
The balanced equation of the reaction is given below:
M₂CO₃ + 2HCl ---> 2MCl + H₂O + CO₂
From the equation of reaction, 1 ,mole of the metal carbonate reacts with 2 moles of excess HCl to produce 2 moles of the metallic salt, 1 mole of water and 1 mole of CO₂.
The mole ratio of the metallic carbonate to carbon (iv) oxide is 1:1
Molar mass of CO₂ = 44 g/mol
Number of moles of CO₂ in 1.206 g of CO₂ = 1.206 g / 44 g/mol = 0.0274 moles
Therefore, 2.002 g of M₂CO₃ = 0.0274 moles since all the metallic carbonate was reacted with excess HCl
mass of 1 mole of M₂CO₃ = 2.002/0.0274 = 73.06 g
M₂CO₃ =73.06
2 * M + 12 + 3 *16 = 73.06
2M = 73.06 - 60
M = 13.06/2
M = 6.53 g
Since, the metal belongs to group 1, the metal is most likely Lithium as the molar mass of M is closest to Lithium.
The balanced equation of the reaction is defined as the number of atoms present equally in the reactant and products.
[tex]M_2CO_3 + 2HCl ---> 2MCl + H_2O + CO_2[/tex]
The metal "M" in the reaction is Lithium.
The steps for the balanced reaction is as follows:-
Balance the center metal firstAfter balancing the central atom, then balanced the hydrogen and the oxygen.
After doing all the steps in the reactions the balanced equation of the reaction is given below:
[tex]Li_2CO_3 + 2HCl ---> 2liCl + H_2O + CO_2[/tex]
This is the balanced reaction.
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I'll GIVE YOU THE BRAINLIEST!!!!!!!!!!!!!!!!!!!!
Place these features in the order they would probably form:
sea stack, sea cave, headland, cliff, and sea arch
What part of the plant is fertilized with pollen to produce seeds?
Leaf
Ovule pistil
Steam
Answer:
B. Ovule
Explanation:
pistil holds the stigma and the ovule
stem holds the flower
leaf is just a leaf
Sulfur dioxide and oxygen react to form sulfur trioxide during one of the key steps in sulfuric acid synthesis. An industrial chemist studying this reaction fills a 200. mL flask with 3.9 atm of sulfur dioxide gas and 3.2 atm of oxygen gas, and when the mixture has come to equilibrium measures the partial pressure of sulfur trioxide gas to be 1.6 atm. Calculate the pressure equilibrium constant for the reaction of sulfur dioxide and oxygen at the final temperature of the mixture. Round your answer to 2 significant digits.
Answer:
0.20
Explanation:
Step 1: Write the balanced equation
2 SO₂(g) + O₂(g) ⇄ 2 SO₃(g)
Step 2: Make an ICE chart
2 SO₂(g) + O₂(g) ⇄ 2 SO₃(g)
I 3.9 3.2 0
C -2x -x +2x
E 3.9-2x 3.2-x 2x
Step 3: Find the value of x
The partial pressure at equilbrium of SO₃ is 1.6 atm. Then,
2x = 1.6 atm
x = 0.80 atm
Step 4: Calculate the partial pressures at equilibrium
pSO₂ = 3.9-2(0.80) = 2.3 atm
pO₂ = 3.2-0.80 = 2.4 atm
pSO₃ = 1.6 atm
Step 5: Calculate the pressure equilibrium constant
Kp = pSO₃² / pSO₂² × pO₂
Kp = 1.6² / 2.3² × 2.4
Kp = 0.20
did the mixture boil faster
I Need help ASAP
An unknown element is a mixture of isotopes ¹²⁰X and ¹²²X. The average atomic mass of X is 120.59 amu. What is the percent abundance of ¹²²X?
Answer:
242X
I HOPE I'M CORRECT THANKS
In a first-order decomposition reaction. 58.6% of a compound decomposes in 11.7 min. How long (in min) does it take for 80.2% of the compound to decompose
Answer:
t = 21.5 min.
Explanation:
Hello!
In this case, since the kinetics of a first-order reaction is:
[tex]\frac{[A]}{[A]_0}=exp(-kt)[/tex]
Thus, since we are given the 11.7 min for a 58.6-% consumption, we can compute the rate constant, k:
[tex]ln(1-0.586)=-kt\\\\k=\frac{ln(0.414)}{-t}=\frac{-0.882}{11.7min}=0.0754min^{-1}[/tex]
Now, for the second problem, as the new consumption is 80.2%, we can compute the required time as shown below:
[tex]ln(1-0.802)=-kt\\\\t=\frac{ln(198)}{k} \\\\t=\frac{-1.62}{0.0754min^{-1}}\\\\t=21.5min[/tex]
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What is a ternary ionic compound?
Answer:
In inorganic chemistry, a ternary compound is a compound containing three different elements. An example is sodium phosphate, Na3PO4. The sodium ion has a charge of 1+ and the phosphate ion has a charge of 3-. Therefore, three sodium ions are needed to balance the charge of one phosphate ion
Explanation:
Answer:
Not all ionic compound are composed of only monatomic ionic a ternary ionic compound is an ionic compound composed of three element in a typical ternary ionic compound there is still one type of cation and one type of anion involved the cation the anion or both is a polyatomic ion
Students were shown models of two atoms and asked to make a list of similarities and differences between the models.
Which of the statements about the atomic models shown is correct?
A) Both models represent atoms with the same atomic number.
B) Both models represent atoms with the same atomic mass.
C) The model on the left is an ion and the model on the right is an isotope.
D) The model on the left is an isotope and the model on the right is an ion.
Answer:
A: Both models represent atoms with the same atomic number.
Explanation:
The atomic number equals the number of protons.
The correct statement is that both models represent atoms with the same atomic number.
What are isotopes?Isotopes are those molecules which are having the same atomic numbers but different atomic masses.
In the given model both they have the same number of electrons and protons it means they are not ions, but are having different atomic masses as number of neutrons are different.
Hence both models represent atoms with the same atomic number.
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In photosynthesis, plants convert what type of energy into what other type of energy? please help
Answer:
Photosynthesis, the process by which green plants and certain other organisms transform light energy into chemical energy. During photosynthesis in green plants, light energy is captured and used to convert water, carbon dioxide, and minerals into oxygen and energy-rich organic compounds.
A chemist adds of a aluminum chloride solution to a flask. Calculate the mass in grams of aluminum chloride the chemist has added to the flask. Be sure your answer has the correct number of significant digits.
The given question is incomplete. The complete question is:
A chemist adds 95.0 ml of a 1.5M aluminum chloride solution to a flask. Calculate the mass in grams of aluminum chloride the chemist has added to the flask. Be sure your answer has the correct number of significant digits.
Answer: 19.0 grams
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.
[tex]Molarity=\frac{n\times 1000}{V_s}[/tex]
where,
n = moles of solute
[tex]V_s[/tex] = volume of solution in ml
moles of [tex]AlCl_3[/tex] = [tex]\frac{\text {given mass}}{\text {Molar mass}}=\frac{xg}{133.34g/mol}[/tex]
Now put all the given values in the formula of molarity, we get
[tex]1.5=\frac{x\times 1000}{95.0\times 133.34}[/tex]
[tex]x=19.0g[/tex]
Therefore, the mass in grams of aluminum chloride the chemist has added to the flask is 19.0
Why is the H-I bond more polar than the S-S bond?
Answer:
see explanation
Explanation:
The polarity of bonds is determined by electronegativity differences. As a guideline we define bonds as:
ionic if Δχ > 2.0
polar if 2.0 > Δχ > 0.5
nonpolar if 0.5 > Δχ
(X being electronegativity)
The polarity of bonds helps us understand non-covalent forces between molecules, such as hydrogen bonding and dipole-dipole interactions. It also helps us interpret the reactivity of molecules. For example, the Si-H bond (χSi = 1.8, χH = 2.1) is more hydride-like than the C-H bond (χC = 2.5, χH = 2.1). Therefore silanes react with acids to make H2, whereas phosphines (χP = 2.1) and hydrocarbons do not. Similarly, electrophilic substitution reactions occur more readily on Si-H and P-H compounds than they do on C-H compounds.
An ice cube is placed onto a hot pan that is sitting on the counter top as shown below. How will the thermal energy move?
Answer:
The coldness will move from the pan to the ice cube. ... Thermal energy moved from a cooler object to a warmer object through radiation.
Explanation:
___Al + ____O2 → ____Al2O3
Answer:
4,3,2
Explanation:
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The half-life of the first-order decay of radioac- . 14C . b l:Ive 1s a out 5720 years. Calculate the rate constant for the reaction. (b) The natural abundance of 14C isotope is 1.1 x I 0-13 mol % in living matter. Radiochemical analysis of an object obtained in an archeological excavation shows that the 14 C isotope content is 0.89 x 10-14 mol %. Calculate the age of the object. State any assumptions.
Answer:
a. Rate constant: 1.2118x10⁻⁴ yrs⁻¹
b. The age of the object is 20750 years
Explanation:
a. We can solve the rate constant in an isotope decay by using Half-Life, as follows:
K = Ln 2 / Half-life
K = ln 2 / 5720 years =
1.2118x10⁻⁴ yrs⁻¹b. The general equation of isotope decay is:
Ln [A] = -kt + Ln [A]₀
Where [A] is concentration of the isotope after time t,
k is rate constant
and [A]₀ initial concentration of the isotope.
Computing the values of the problem:
Ln [0.89x10⁻¹⁴] = -1.2118x10⁻⁴ yrs⁻¹t + Ln [1.1x10⁻¹³]
-2.5144 = -1.2118x10⁻⁴ yrs⁻¹t
20750 years = t
The age of the object is 20750 years
After passing, it is important to always follow through. T/F
False
True
2.
Which is not a component of throwing?
muscle
follow through
balance
hand eye coordination
3.
Which is NOT a type of basketball pass?
shoulder pass
chest pass
overhead pass
bounce pass
4.
Passing does not require hand eye coordination. T/F
False
True
5.
Which sport does not require passing or throwing?
Football
Basketball
Tennis
Baseball
Answer:
t
Explanation:
If something has an actual yield of 2.5 grams and a theoretical yield of 10 grams, what is the percent yield?
A)30%
B)25%
C)45%
D)10%
a 1.912 g samplw of calcium chloride is decomposed and found to contain 0.690 g of Ca and 1.222 g of Cl. Calculate the mass percent composition of Ca in calcium chloride
Answer:
36.09% is the mass percent composition of calcium in calcium chloride
Explanation:
Mass percent is defined as one hundred times the ratio between the mass of a compound (In this case, Calcium), and the total mass of the sample:
Mass Percent = Mass compound / Total mass of the sample × 100
Computing the values of the problem:
Mass Percent = 0.690g / 1.912g * 100
Mass percent =
36.09% is the mass percent composition of calcium in calcium chlorideAriel drew the cladogram shown.
Which best describes species C?
It has jaws, but no hollow bones.
It has hollow bones, but no jaws.
It has neither hollow bones nor jaws.
It has hollow bones and jaws.
Answer:
It has hollow bones and jaws.
Explanation:
The cladogram shows that Species C has both hollow bones and Jaws. Species A has hollow bones while species B has Jaws. The cladograms shows that species C has both the characteristics.
Answer:
C. It has neither hollow bones nor jaws.
Explanation:
A metal cube has an edge that is 11.4 mm long and a mass of 6.67 g. Calculate the density of the metal and determine the likely identity of the metal.
Answer:
d = 4.5 g/cm³
Metal cube is made up off titanium.
Explanation:
Given data:
Edge length of cube = a = 11.4 mm
Mass of metal cube = 6.67 g
Density and identity of metal = ?
Solution:
First of all we will calculate the volume of cube.
V = a³
V = (11.4mm)³
V = 1481.54 mm³
mm³ to cm³:
1481.54 mm³× 1 cm³/ 1000 mm³
1.482 cm³
Density:
d = m/v
d = 6.67 g/ 1.482 cm³
d = 4.5 g/cm³
Metal cube is made up off titanium because density of titanium is 4.5 g/cm³.
CzHs + __02-> __CO2+ _H20 *
I need help ASAP PLSSS
Answer:
2,7,4,6
Explanation:
atoms at the left side should be equal to that of right for an equation to be balanced. so the answer is the final one
What is the correct name for: C3S5?
Answer: calcium ion
Explanation:
A restaurant sells cheeseburgers for $5.00 and French fries for $3.00. An
equation that represents the number of cheeseburgers and French fries that can
be bought for $20.00 is 5x + 3y = 20. Rearrange the equation to solve for the
number of French fries. *
Answer:
x = (20 - 3y) / 5
Explanation:
Let
french fires be represented by = x
cheeseburgers be represented by = y
The equation is given as;
5x + 3y = 20.
Rearrange the equation to solve for the number of French fries.
This means we are to make french fries (x) the subject of equation
5x + 3y = 20
5x = 20 - 3y
x = (20 - 3y) / 5
Calculate the second volumes 980L at 71C and 107.2atm to 13C and 59.3atm
Answer:
V₂ = 1473.03 L
Explanation:
Given data:
Initial volume = 980 L
Initial pressure = 107.2 atm
Initial temperature = 71 °C (71 +273.15 = 344.15 K)
Final temperature = 13°C (13+273.15 = 286.15K)
Final volume = ?
Final pressure = 59.3 atm
Formula:
P₁V₁/T₁ = P₂V₂/T₂
Solution:
V₂ = P₁V₁ T₂/ T₁ P₂
V₂ = 107.2 atm × 980L × 286.15 K / 344.15 K× 59.3 atm
V₂ = 30061774.4 atm .L. K / 20408.095 atm. K
V₂ = 1473.03 L
4.0 cm north + 3.5 cm west
