Answer:
It takes 0.27 second to travel the distance of 100 yard
Explanation:
We can use the formula ( t = d / s )t = d / s = 91 m / 333 m/s = 0.27 s
Which substance would retain the most heat for the longest period of time?
Answer:
C - H2O(l)
Explanation:
im smart
A 2.650 grams sample of gas occupies a volume of 428cm^3 at a pressure of 99.06 kPa and 24.3˚C. Analysis of this compound reveals a composition of 15.5% C, 23.0% Cl and61.5% F by mass. Determine the true, molecular, formula.
The true molecular formula of the compound is C₂ClF₅
Determination of the mole of the compound Volume (V) = 428 cm³ = 428 / 1000 = 0.428 LPressure (P) = 99.06 KPa = 99.06 / 101.325 = 0.978 atmTemperature (T) = 24.3˚C = 24.3 + 273 = 297.3 KGas constant (R) = 0.0821 atm.L/Kmol Number of mole (n) =?The number of mole can be obtained as by using the ideal gas equation as illustrated below:
n = PV / RT
n = (0.978 × 0.428) / (0.0821 × 297.3)
n = 0.017 mole
How to determine the molar mass Mole = 0.017 moleMass = 2.650 gMolar mass =?Molar mass = mass / mole
Molar mass = 2.650 / 0.017
Molar mass = 155.88 g/mol
How to determine the empirical formulaCarbon (C) = 15.5%Chlorine (Cl) = 23%Fluorine (F) = 61.5%Empirical formula =?Divide by their molar mass
C = 15.5 / 12 = 1.292
Cl = 23 / 35.5 = 0.648
F = 61.5 / 19 = 3.237
Divide by the smallest
C = 1.292 / 0.648 = 2
Cl = 0.648 / 0.648 = 1
F = 3.237 / 0.648 = 5
Thus, the empirical formula of the compound is C₂ClF₅
How to determine the molecular formula Molar mass of compound = 155.88 g/molEmpirical formula = C₂ClF₅Molecular formula =?Molecular formula = empirical × n = molar mass
[C₂ClF₅]ₙ = 118.084
[(12×2) + 35.5 + (19×5)]ₙ = 155.88
154.5n = 155.88
Divide both side by 154.5
n = 155.88 / 154.5
n = 1
Molecular formula = [C₂ClF₅]ₙ
Molecular formula = [C₂ClF₅]1
Molecular formula = C₂ClF₅
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Which of the following is the BEST description of a temperate grassland ecosystem?
It is an area that is covered in grasses and wildflowers that receives enough rainfall to support the grassland but not the growth of trees.
It is an area that is covered in grasses and wildflowers that has occasional fires that harm life on the prairie.
It is an area that is covered in grasses and wildflowers that receives enough rain to support both the grassland and the growth of trees.
It is an area that once had a few species of grasses and flowers but now has great diversity because of the plants brought by settlers.
Answer:
It is an area that is covered in grasses and wildflowers that receives enough rainfall to support the grassland but not the growth of trees.
Explanation:
Best description of a temperate grassland ecosystem is an area that is covered in grasses and wildflowers that receives enough rainfall to support the grassland but not the growth of trees.
What is a temperate grassland ecosystem?Temperate grasslands are one of the most important biomes to understand. They play an important role in our survival. They also play an important role in helping to manage climate change.
Different types of grasslands have some similar characteristics. Savannas have scattered trees and exist in certain parts of Africa, South America, Australia, and Asia. Temperate grasslands are largely devoid of trees with less rainfall than savannas.
Steppes have shorter grasses whereas prairies have taller grasses due to higher precipitation. Both types of temperate grasslands exist throughout North America and Europe.
Therefore, best description of a temperate grassland ecosystem is an area that is covered in grasses and wildflowers that receives enough rainfall to support the grassland but not the growth of trees.
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#SPJ3
Convert 22.8 in3 to cm3. Given 1 inch = 2.54 cm. ____________cm3
Answer:
22.8 in3 to cm3
= 373.6251 cm3
which of the following combinations can be used to prepare a buffer at ph 1
A buffer is a solution which resists changes to it pH when a small quantity of acid or base is added to it.
What is a buffer?A buffer is a solution which resists changes to it pH when a small quantity of acid or base is added to it.
Buffers are made from solutions of weak acids and their salts or weak bases and their salts.
What is pH?The pH of a solution is the negative logarithm to base 10 of yhe hydrogen ion concentration of the solution.
Solutions of low pH have high concentration of hydrogen ions while solutions of high pH have high hydrogen ion concentration.
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How many grams of S are in 475 g of SO2?
There are 237. 5 g of Sulfur,S in 475 g of SO2?
Calculation of grams of SulfurFrom the question, we can say that
The molar mass of sulfur = 32 g/molThe molar mass of oxygen = 16 g/molTherefore,
The molar mass for SO2 = 32 + (16 × 2) g/mol = 64 g/mol
Now,
If 1 mole of SO2 contains 1 mole of S
Then 64 g of SO2, will contain 32g of S;
Such that
475 g of SO2 will give { [tex]\frac{ 32g of S) ( 475 g of SO2)}{64 of SO2}[/tex] } = 237. 5 g of Sulfur.
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A sample of grape juice has a hydroxide ion concentration of 1.4 x 10^-10 M. Which of these equations will
you use to find the hydronium ion concentration?
Answer:
Explanation:
grape juice
pOH = -log[1.4*10⁻¹⁰]≈9.6
pH=14-pOH=14-9.6=4.4
orange juce
pH= -log[1.8*10⁻⁴]=3.7
Orange juice has lower pH, so it is more acidic.
Stoichiometry Practice: I have the answers I just need to know how to show my work. Can someone send me a pic of the shown work for these 2 problems?
Answers:
1.
The mole ratio of AlCl₃ to Cl₂ is 2 : 3. This means for production of every 2 moles of AlCl₃ 3 moles of Cl₂ is consumed. Hence, if 3 moles of AlCl₃ is produced then Cl₂ consumed is,
= 3 × 3 / 2
= 4.5 moles of Cl₂
2.
Mole ratio of C₃H₈ to CO₂ is 1 : 3.
Hence, 0.5 moles of C₃H₈ will produce 1.5 moles of CO₂.
Also,
At STP one mole of an ideal gas occupied 22.4 L of volume. Hence, 1.5 moles of CO₂ gas will occupy,
Volume = 1.5 mol × 22.4 L/mol
Volume = 33.6 L of CO₂
Balance the following chemical equation (if necessary):
SiCI4 (s) + H2O(I) → H4SiO4 (aq) + HCI(aq)
Answer: SiCl₄(s) + 4 H₂O(l) → H₄SiO₄(aq) + 4 HCl(aq)
Explanation:
You can pretend there is an imaginary line splitting the chemical equation into two on the arrow to help balance the equation.
Balance out chlorine on both sides, add the coefficient 4 to HCl
now there are 4 chlorines on the left and the right side.
Then, balance out Hydrogen on both sides, add the coefficient 4 to H₂O
now, there are 4*2=8 hydrogens on the left and 4+4=8 hydrogens on the right.
Counting the total number of atoms on both sides of the arrow, the equation is balanced
1 Si = 1 Si
4 Cl = 4 Cl
4 O = 4 O
8 H = 8 H
[tex]\\ \sf\longmapsto SiCl_4+4H_2O\longrightarrow H_4SiO_4+4HCl[/tex]
On reactant side
Si=1H=8Cl=4O=4On products side
Si=1H=8Cl=4O=4PLEASE HELP ME
Thermal energy always moves from a hotter area to a cooler area.
This movement is
called heat.
1.True
2.False
Answer:
true
Explanation:
because heat tempeture wise it can cool down
Item 2
What does it mean when a symbol in a chemical formula is not followed by a subscript?
There is just one atom of that element in a molecule of that compound.
There are no atoms of that element in a molecule of that compound.
There is an unknown number of atoms of that element in a molecule of that compound.
Answer:
There is just one atom of that element in a molecule of that compound.
Explanation:
why are atoms more stable when their valence level is complete?
Answer:
To achieve greater stability, atoms will tend to completely fill their outer shells and will bond with other elements to accomplish this goal by sharing electrons, accepting electrons from another atom, or donating electrons to another atom.
Explanation:
To make a softball bat, a block of wood is carefully crafted into a shape that will allow a
batter to best apply force on a softball. All of the following describe physical changes that
may be used in the process of making a softball bat, EXCEPT
How does the amount of energy coming from the energy source (low vs. high) affect the amount of electrical energy created.
Answer:The environmental problems directly related to energy production and Electricity is a secondary energy source that is generated producedfrom primary energy sources:
hope that helps im new so have a good day (:
Explanation:
write the name for NaCl
The name for NaCl is Sodium chloride
Salt and it's examples.Salt is defined as the chemical compound that contains both a positively charged cation.and negatively charged anion.
It is formed by the reaction of acid and base is a neutralisation reaction.
Examples of salt include:
Sodium Chloride or Common Salt (NaCl)Sodium Hydroxide (NaOH)Sodium Carbonate or Washing Soda (Na2CO3.10H2O)Baking Soda or Sodium Bi-carbonate (NaHCO3)Bleaching Powder or Calcium Hypochlorite.Therefore another name for salt is common salt.
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73.4 km to m then answer in correct number of significant numbers
Answer:
To determine the number of significant figures in a number use the following 3 rules:
To determine the number of significant figures in a number use the following 3 rules:Non-zero digits are always significant.
To determine the number of significant figures in a number use the following 3 rules:Non-zero digits are always significant.Any zeros between two significant digits are significant.
To determine the number of significant figures in a number use the following 3 rules:Non-zero digits are always significant.Any zeros between two significant digits are significant.A final zero or trailing zeros in the decimal portion ONLY are significant.
How many significant figures in 209.0
what agricultural is practiced in or near San Diego? Choose a food that is grown or produced locally. Describe the food,Where and when is the food produced and how? What is a recipe that uses this food? What does this food make you wonder about the agriculture in or near San Diego?
please help!!
Answer:
San Diego boasts top crops in nursery, flowers, avocados, tomatoes, citrus, chickens & eggs, shrooms, succulents, strawberries, coffee & cannabis. Most of San Diego County farms are small 1-9 acre proprieties, and that awards San Diego County more certified organic growers than any other county in the nation.
scientific notation of 0.056 x 10^6
[tex]\\ \tt\bull\rightarrowtail 0.056\times 10^{-6}[/tex]
[tex]\\ \tt\bull\rightarrowtail 0.56\times 10^{-7}[/tex]
[tex]\\ \tt\bull\rightarrowtail 5.6\times 10^{-8}[/tex]
Done
If you begin with 5.000 grams of KClO3(s) how many moles and KClO3(s)
will be used, and b) how many grams, moles, and molecules of the product species will
be formed?
Based on the given data, the amount of products from 5.00 g of KClO₃ is:
0.04 moles of KCl2.98 g KCl2.41 * 10²² molecules of KCl 0.06 moles of O₂.1.92 g of O₂3.61 * 10²² molecules of O₂What amount of products is formed from the decomposition of KClO₃?The decomposition of KClO₃ is given by the equation below:
2 KClO₃ -----> 2 KCl + 3 O₂
2 moles of KClO₃ produces 2 moles of KCl and 3 moles of O₂
Molar mass of KClO₃ is 122.5 g/mol
molar mass of KCl = 74.5 g
molar mass of O₂ = 32 g
Moles of KClO₃ in 5.00 g = 5.00/122.5
moles of KClO₃ = 0.04 molesFor KCl
a. moles: 0.04 moles of KClO₃ will produce 0.04 moles of KCl
b. mass of KCl = 0.04 * 74.5 = 2.98 g KCl
c. number of molecules of KCl = 0.04 * 6.02 * 10²³ = 2.41 * 10²² molecules of KCl
For O₂:
a. moles of O₂; 0.04 moles of KClO₃ will produce = 0.06 moles of O₂.
b. mass of O₂ = 0.06 * 32 g = 1.92 g of O₂
c. number of molecules: 0.06 * 6.02 * 10²³ = 3.61 * 10²² molecules of O₂
Therefore, the amount of products from 5.00 g of KClO₃ is:
0.04 moles of KCl2.98 g KCl2.41 * 10²² molecules of KCl 0.06 moles of O₂.1.92 g of O₂3.61 * 10²² molecules of O₂Learn more about moles and molecules at: https://brainly.com/question/26135244
what is the mathematical relationship between the independent and dependent variables
Answer:
The independent variable influences change in the dependent variable whether the points on the scatterplot go up or down from left to right.
Explanation:
How many electrons does sodium have with a +2 charge?
Answer:it has eleven electrons
Explanation:
How many grams of nitrogen are in 1.5 moles of nitrogen atoms
Answer:
42 grams
Explanation:
the conversion between moles and grams is by using the molar mass of the substance.
The molar mass for a nitrogen atom is 14.00 g/mol.
N2 has two nitrogen atoms, so its molar mass is 28.00 g/mol
To find how many grams are in 1.5 moles;
[tex]28g/mol*1.5mol[/tex]
the units of mols cancels out, leaving one with units of grams of N2
Identify which balance was used to make each mass reading. 0.90 g Choose... 1.230 g Choose... 5.43 g Choose... 4.0000 g Choose... 6.539 g Choose...
The balance that can be used to measure a mass reading of 0.90 g will be a balance with ±0.01 g tolerance.
The mass reading balance used for measurement
1.230 g ±0.001 g tolerance
5.43g ±0.01 g tolerance
4.0000g ±0.0001 g tolerance
6.539g ±0.001 g tolerance
What is the tolerance of a balance?The tolerance of a balance is the number of decimal place values shown on the balance and it is the permissible limitations measured in grams, that a balance can tolerate.
Hence, depending on the decimal place value behind a mass reading will determine the balance used for measurement.From the given parameters:
The mass reading balance used for measurement
0.90 g ±0.01 g tolerance
1.230 g ±0.001 g tolerance
5.43g ±0.01 g tolerance
4.0000g ±0.0001 g tolerance
6.539g ±0.001 g tolerance
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Calculate the mass percentage of potassium in K3PO4
1) determine molar mass of K₃PO₄
[tex]=3(39.10)+30.97+4(16)\\=212.27\ g/mol[/tex]
2) determine total mass of potassium atoms in K₃PO₄
[tex]=3(39.10)\\=117.3\ g[/tex]
4) divide by molar mass and multiply by 100
[tex]=\frac{117.30}{212.27}[/tex] × [tex]100[/tex]
= 55.25981062% (round as you wish)
Acenaphthylene, a hydrocarbon that is a constituent of a coal tar, is 94.71% and has a molar mass of 152.19 g/mol. What are the empirical and molecular formulas of acenaphthylene?
Answer:
From what I personally know, Acenaphthylene 75%. Empirical Formula (Hill Notation): C12H8. CAS Number: 208-96-8. Molecular Weight: 152.19. Beilstein: 774092. EC Number:
Explanation:
Acenaphthylene, a polycyclic aromatic hydrocarbon is an ortho- and peri-fused tricyclic hydrocarbon. The molecule resembles naphthalene with positions 1 and 8 connected by a -CH=CH- unit. It is a yellow solid. Unlike many polycyclic aromatic hydrocarbons, it has no fluorescence. Acenaphthylene/Formula is C12H8.
I'm not sure if this will help you but this is what I know so I hope it does :)
N2 + 3H22NH3
How many moles of hydrogen are needed to react with 2 moles of nitrogen?
Explanation:
n2 ×2b is the only solution
A 8952 g of water was completely melted. Calculate the amount of heat absorbed in this
process.
To melt 8952 g of water, 2.986 × 10⁶ J of heat are required.
What is the heat of fusion?The heat of fusion is the heat absorbed by a unit mass of a given solid at its melting point that completely converts the solid to a liquid at the same temperature.
8952 g of water melt, that is, they undergo fusion.
We can calculate the amount of heat absorbed in this process using the following expression.
Q = ΔH°f × m = 333.55 J/g × 8952 g = 2.986 × 10⁶ J
where,
Q is the amount of heat absorbed by water.ΔH°f is the heat of fusion of water.m is the mass of water.To melt 8952 g of water, 2.986 × 10⁶ J of heat are required.
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What is it called when only the needed genes are transcribed and translated in
proteins and the others are turned off until the are needed?
Mitosis
Gene expression
Cell Respiration
Apoptosis
Answer:
243
Explanation:
?
5. How many moles in 49.8 Liters of O2 at STP?
