Answer:
The higher up an object is the greater its gravitational potential energy. ... As most of this GPE gets changed into kinetic energy, the higher up the object starts from the faster it will be falling when it hits the ground. So a change in gravitational potential energy depends on the height an object moves through.
The great French chemist Antoine Lavoisier discovered the Law of Conservation of Mass in part by doing a famous experiment in 1775. In this experiment Lavoisier found that mercury(II) oxide, when heated, decomposed into liquid mercury and an invisible and previously unknown substance: oxygen gas.
Required:
a. Write a balanced chemical equation, including physical state symbols, decomposition of solild mercurytl) oxide (HgO) into liquid mercury and gaseous dioxygen.
b. Suppose 73.0 mL. of dioxygen gas are produced by this reaction, at a temperature of 130.0 °C and pressure of exactly 1 atm. Calculate the mass of mercury() oxide that must have reacted.
Answer:
a. 2 HgO(s) ⇒ 2 Hg(l) + O₂(g)
b. 0.957 g
Explanation:
Step 1: Write the balanced equation
2 HgO(s) ⇒ 2 Hg(l) + O₂(g)
Step 2: Convert 130.0 °C to Kelvin
We will use the following expression.
K = °C + 273.15
K = 130.0°C + 273.15
K = 403.2 K
Step 3: Calculate the moles of O₂
We will use the ideal gas equation.
P × V = n × R × T
n = P × V/R × T
n = 1 atm × 0.0730 L/0.0821 atm.L/mol.K × 403.2 K
n = 2.21 × 10⁻³ mol
Step 4: Calculate the moles of HgO that produced 2.21 × 10⁻³ moles of O₂
The molar ratio of HgO to O₂ is 2:1. The moles of HgO required are 2/1 × 2.21 × 10⁻³ mol = 4.42 × 10⁻³ mol.
Step 5: Calculate the mass corresponding to 4.42 × 10⁻³ moles of HgO
The molar mass of HgO is 216.59 g/mol.
4.42 × 10⁻³ mol × 216.59 g/mol = 0.957 g
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
How many molecules of iodine are produced when 9.3×1026 molecules of chlorine gas react with lithium iodide?
__Cl2 + __LiI à __LiCl + __ I2
Answer:
[tex]9.3x10^{26}molec\ I_2[/tex]
Explanation:
Hello!
In this case, considering the balanced chemical reaction:
Cl₂ + 2LiI ⇒ 2LiCl + I₂
We can see there is a 1:1 mole ratio between the produced iodine and the used chlorine, thus, we infer that the number of molecules of iodine given those of chlorine turn out:
[tex]9.3x10^{26}molec\ Cl_2*\frac{6.022x10^{23}molec\ I_2}{6.022x10^{23}molec\ Cl_2} =9.3x10^{26}molec\ I_2[/tex]
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Answer:
9.3 × 10²⁶ molecules of I₂
Explanation:
Step 1: Given data
Molecules of I₂: ?Molecules of Cl₂: 9.3 × 10²⁶ moleculesStep 2: Write the balanced single displacement reaction
Cl₂ + 2 LiI ⇒ 2 LiCl + I₂
Step 3: Calculate the molecules of I₂ produced from 9.3 × 10²⁶ molecules of Cl₂
According to the balanced equation, the molecular ratio of Cl₂ to I₂ is 1:1.
9.3 × 10²⁶ molecule Cl₂ × 1 molecule I₂/1 molecule Cl₂ = 9.3 × 10²⁶ molecule I₂
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
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
A 8.00 L tank at 26.9 C is filled with 5.53 g of dinitrogen difluoride gas and 17.3 g of sulfur hexafluoride gas. You can assume both gases behave as ideal gases under these conditions. Calculate the mole fraction of each gas. Round each of your answers to significant digits.
Answer:
[tex]x_{N_2F_2}= 0.415\\\\x_{SF_6}=0.585[/tex]
Explanation:
Hello!
In this case, since the mole fraction of both gases in the tank is computed via:
[tex]x_{N_2F_2}=\frac{n_{N_2F_2}}{n_{N_2F_2}+n_{SF_6}} \\\\x_{SF_6}=\frac{n_{SF_6}}{n_{N_2F_2}+n_{SF_6}}[/tex]
It means we need to compute the moles of each gas, just as it is shown down below:
[tex]n_{N_2F_2}}=5.53gN_2F_2*\frac{1molN_2F_2}{66.01gN_2F_2} =0.0838molN_2F_2\\\\n_{SF_6}=17.3gSF_6*\frac{1molSF_6}{146.06gSF_6} =0.118molSF_6[/tex]
Thus, the mole fractions turn out:
[tex]x_{N_2F_2}=\frac{0.0838mol}{0.0838mol+0.118mol}= 0.415\\\\x_{SF_6}=\frac{0.0838mol}{0.0838mol+0.0838mol}=0.585[/tex]
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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 chlorideA 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.
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:
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
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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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]
Best regards!
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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if a solid dissolves into a liquid, what does it mean about the properties of its molecules? Describe what it would look like on the nanoscale.
Polar solute dissolve in polar solvent and non polar solute dissolve in non polar solvent. Therefore, when any solute dissolves in a solvent, then the nature of solute and solvent is same.
What is solubility?Solubility shows the extent of solubility of a solute in solvent to make a solution. Solute is substances that is present in small amount. solvent is a substance that is present in large amount. Its SI unit is gram per litre or g/L.
Bond strength affect the solubility of a solute in solvent. weaker the bond strength is, more the solubility is. The weaker bond can be easily broken by water molecule.
Polar solute dissolve in polar solvent and non polar solute dissolve in non polar solvent. when any solute dissolves in a solvent, then the nature of solute and solvent is same.
Therefore, when any solute dissolves in a solvent, then the nature of solute and solvent is same.
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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.
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
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
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
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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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:
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
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3. How much force does a 15 kg baby have that is crawling through the house at an acceleration of 12 m/s2? *
Answer:
15×12=180
Explanation:
Force=Mass ×Acceleration
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.
How does the energy of the atoms in a hot cup of coffee compare to the energy of the atoms in a piece of ice?
The atoms in the cup of coffee have more energy.
The atoms in the cup of coffee have less energy.
The atoms in the cup of coffee have the same amount of energy.
Answer:
The atoms in the cup of coffee have more energy.
Explanation:
The difference between the hot cup of coffee and the piece of ice is their temperature. The hot cup of coffee has a higher temperature than the ice.
The relationship between the energy and temperature is a direct relationship. This means that higher temperature means higher kinetic energy and vice versa.
Since the hot cup of coffee has a higher temperature, it means it also have the highest amount of energy. The correct option is;
The atoms in the cup of coffee have more energy.
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:
Which line of defense includes active immunity?
•first
•second
•third
•fourth
Hurry up please
Answer:
B is the answer.
Explanation:
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How many moles of CO2 must dissolve in excess water to produce 12 moles of
H2CO3?
Answer:
12 moles of CO₂.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
CO₂ + H₂O —> H₂CO₃
From the balanced equation above,
1 mole of CO₂ dissolves in water to produce 1 mole of H₂CO₃.
Finally, we shall determine the number of moles of CO₂ that will dissolve in water to produce 12 moles of H₂CO₃. This can be obtained as follow:
From the balanced equation above,
1 mole of CO₂ dissolves in water to produce 1 mole of H₂CO₃.
Therefore, 12 moles of CO₂ will also dissolve in water to produce 12 moles of H₂CO₃.
Thus, 12 moles of CO₂ is required.
Ariel 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:
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.
___Al + ____O2 → ____Al2O3
Answer:
4,3,2
Explanation:
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