Answer: pressure exerted by vapor
Explanation:
The table compares some characteristics of two atoms.
Charged Particles
Atom Number of Neutrons Mass Number
х
6
12
Y
7
13
Use the table to determine the number of protons for each atom. Then, choose the statement below that is true about the two atoms.
The number of protons in X would be 6 while that of Y would also be 6. Thus, the two atoms would be isotopes of the same element.
Atomic properties of atomsThe mass number of an atom is the sum of protons and neutrons present in the atom.
For X with mass number 12 and neutron number 6, the number of protons would be:
12 - 6 = 6 protons
For Y with mass number 13 and neutron number 7, the number of protons would be:
13 - 7 = 6 protons.
Thus, both atoms have the same number of protons, meaning that they are likely isotopes of the same element.
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Which of the following is not a reason the nitrogen cycle is important to life on Earth?
a.
All living things need nitrogen to make proteins.
b.
Nitrogen is radioactive if it doesn’t go through the cycle.
c.
Organisms cannot use nitrogen directly.
d.
All living things need nitrogen to make DNA.
Answer:
b
Explanation:
Why do scientists listen to ocean around plate boundary?
Answer:
Scientists discovered that when the locations of earthquakes were plotted on a world map, these locations occurred in a pattern, or variety of patterns.
Explanation:
What is the theoretical yield of sodium chloride for the reaction of 55.0 g of Na
D
with 67.2 g Cl2?
g
a. 1.40 x 102 g NaCl
b. 111 g NaCl
c. 55.4 g NaCl
222 g NaCl
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Actually Welcome to the concept of Physical chemistry, and Stochiometry.
So we balance the equation as,
2Na + Cl2 ===> 2NaCl
The required reaction is as:
2Na+ Cl2 = 2NaCl
2 moles Na = 2×23 g = 46g,1 mole Cl2 = 2×35.5g=71g
Now,71g Cl2 reacts with 46g Na,
Therefore, 67.2g Cl2 reacts with 46×67.2/71= 43.54g Name
The rest Na = (55–43.54)g=11.46g
That means Cl2 is a limiting reactant.
Again,2 moles NaCl=2(23+35.5)g=117g
Then,71g Cl2 produce 117g NaCl
Therefore,67.2g Cl2 produce 117×67.2/71 = 110.74g NaCl
hence the correct option is, b.) 111 g NaCl
Problem To Solve:
Scenario: you have a very bad head-ache so you run to the pharmacy to grab some medicine and are immediately over-whelmed with your options. You decide to buy the cheapest option to cure your headache.
Availability:
Excedrin is available as a 200 caplet bottle for $15.51 and each caplet contains 250- mg of acetaminophen (the active ingredient in Excedrin).
Advil is available as a 300 tablet bottle for $15.00 and each tablet contains 200-mg of Ibuprofen (the active ingredient in Advil).
Tylenol is available as a 225 pill bottle for $14.97 and each pill contains 500mg of a paracetamol (the active ingredient in Tylenol).
Dosage Information:
Acetaminophen is dosed as 240 mg per 35 pounds of body mass.
Ibuprofen is dosed at 113 mg per 25 pounds of body mass.
Paracetamol is dosed at 102mg per 15 pounds of body mass.
Active ingredient information:
Acetaminophen has the chemical formula: C8H9NO2
Ibuprofen has the chemical formula C13H18)2.
Paracetamol has the chemical formula C8H9NO2.
How:
Calculate the cost of treating your own headache for each medicine based on your own body weight = 130 pounds.
Clearly write out and organize all the conversion factors, then write out the conversion for each medicine. Once you have concluded the cheapest option for curing your headache, calculate the cost per individual molecule of your pain reliever.
Please help me solve this and write all the conversion factors, and write out the conversion for each medicine. Thank you!
Based on the drug dosage provided, cheapest drug for treating headache is Tylenol at a cost of 3.34×10^-23 $/molecule.
What is a drug dosage?A drug dosage is the amount of a drug taken by an individual that produces a therapeutic effect.
The dosage of each drug is given below:
Acetaminophen is dosed as 240 mg per 35 pounds of body mass.Ibuprofen is dosed at 113 mg per 25 pounds of body mass.Paracetamol is dosed at 102mg per 15 pounds of body mass.Amount of each drug required by individual is as follows:
Acetaminophen = 240 mg/35 × 130 = 891.43 mg
Ibuprofen = 113 mg/25 × 130= 587.6 mg
Paracetamol = 102mg/15 × 130 = 884 mg
Cost of drug per mg of active ingredient is as follows;
Excedrin = $15.51/(200 * 250 mg) = 0.0003102 $/mg
Advil = $15/(300 * 200mg) = 0.00025 $/mg
Tylenol = $14.97/(500mg × 225) = 0.000133 $/mg
Cost of each drug for treatment of headache:
Excedrin = 0.0003102 $/mg × 891.43 mg = $0.278
Advil = 0.00025 $/mg × 587.6 mg = $0.147
Tylenol = 0.000133 $/mg × 884 mg = $0.118
Thus, Tylenol is the cheapest drug for treating headache.
Molar mass of paracetamol = 151 g = 151000 g
There are 6.02 × 10^23 molecules in 151000 mg of paracetamol.
Cost per molecule = 0.000133 $/mg × (15000 mg/6.02 × 10^23)
Cost per molecule = 3.34 × 10^-23 $/molecule
Therefore, the cheapest drug for treating headache is Tylenol at a cost of 3.34×10^-23 $/molecule.
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How are potential and kinetic energy different?
Potential energy is stored in a battery, and kinetic energy is released thermal energy that causes electricity.
Potential energy is stored in an object, and kinetic energy is released mechanical energy that causes motion.
Kinetic energy is the movement of an object, and potential energy is released electrical energy when an object moves.
Kinetic energy is stored in an object, and potential energy is released mechanical energy that causes motion.
Answer:
b) potential energy is stored in an object, and kinetic energy is released mechanical energy that causes motion.
Explanation:
potential energy is stored because it is the possible energy of an object if a force is acted upon it. on the other hand, kinetic energy is essentially when potential energy is being acted upon or changed.
Answer: The second option
Explanation: For example, if a ball is sitting at the top of a hill, it has a lot of potential energy. If it then falls off, potential energy will turn into kinetic energy and the ball will roll down the hill.
How many molecules are equivalent to 0.5 mol 02 molecule?
No of molecules
Moles×Avagadro no0.5×6.022×10²³3.011×10²³moleculesNote that
For any element ,1 mol of them contains 6.022×10²³ molecules or atoms2. If you were to take a radio to the moon, which of the following would
correctly describe the changes to its mass and weight?
A. Its mass and weight would not change.
B. Its mass would increase, and its weight would remain the same
C. Its weight would increase, and its mass would remain the same
D. Its weight would decrease, and its mass would remain the sam
Determine the type of reaction: AgNO3 + Cu --> Cu(NO3)2 + Ag
a. Double displacement
b. single displacement
c. Decomposition
d. Synthesis
Answer:
b. single displacement
HCl(?) + H2O(?) → H3O+(?) + Cl-(?)
What is the phase label on Cl-?
Answer:
H30,+ion is known as Hydroniom Ion
Explanation:
brain ly ----
everyday
brainless this answer is correct
match the following
Answer:
1 FOSSIL FUEL WITH A2 COMBUSTION WITH D3 PETROL WITH C4 GOBAR GAS WITH E5 FIRE EXTINGUISHER WITH B
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Will a precipitate form if you mix 75.0 mL of a NaOH solution with pOH of 2.58 if it is mixed with 125.0 mL of a 0.0018 M MgCl2 solution
A precipiatate of mass 0.013 g is formed when you mix 75.0 mL of a NaOH solution with pOH of 2.58 and 125.0 mL of a 0.0018 M MgCl2 solution
What is stoichiometry?In stoichiometry, calculations are made based on mass - mole or mole - volume relationships. First we must put down the balanced reaction equation; 2NaOH(aq) + MgCl2(aq) -----> Mg(OH)2(s) + 2NaCl(aq)
Now Ionically;
2OH^-(aq) + Mg^2+(aq) -----> Mg(OH)2(s)
Concentration of OH^- = Antilog (-2.58) = 2.6 * 10^-3 M
Number of moles of OH^- = 2.6 * 10^-3 M * 75/1000 = 0.000195 moles
Concentration of Mg^2+ = 0.0018 M
Number of moles of Mg^2+ =0.0018 M * 125/1000 = 0.000225 moles
Since;
1 mole of Mg^2+ reacts with 2 moles of OH^-
x moles of Mg^2+ reacts with 0.000195 moles of OH^-
x = 0.0000975 moles
Mg^2+ is the limiting reactant.
1 mole of Mg^2+ yields 1 mole of the precipitate
0.000225 moles of Mg^2+ yields 0.000225 moles of precipitate.
Hence, a precipitate is formed.
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The reaction Na3PO4 + 3HCl → 3NaCl + H3PO4 produces 42.7 g of NaCl. How many grams of Na3PO4 are needed?
Answer:
14.23
Steps given below in the picture
I hope my answer helps you.
........................
Answer:
no questions
it's just all dots here
Which is the correct step(s) for this reaction mechanism?
O NO2 + CO2 + CO NO + CO2
O step 1: NO2 + NO2 → NO + NO3 (slow)
step 2: NO3 + CO → NO2 + CO2 (fast)
O step 1: NO + NO3-NO + NO3 (slow)
step 2: NO3 + CO → NO + CO2 (fast)
O step 1: 2N02 + NO 2NO + NO3 (slow)
step 2: NO3 + CO → 2NO2 + CO2 (fast)
The reaction mechanims shows the sequence of steps through which a reaction occurs. The reaction mechanism for this reaction is;
step 1: NO2 + NO2 → NO + NO3 (slow)
step 2: NO3 + CO → NO2 + CO2 (fast)
What is reaction mechanism?We have to note that not all reactions occur in a single reactive encounter. If a reaction occurs in a single reactive encounter then it is called an elementary reaction.
The reaction mechanim shows the reaction sequence of a non elementary reaction. The correct mechanims of this reaction is shown as;
step 1: NO2 + NO2 → NO + NO3 (slow)
step 2: NO3 + CO → NO2 + CO2 (fast)
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what can you say about the acceleration when the pressure decreases from left to right
When the pressure decreases from left to right, the acceleration also decreases.
What is Acceleration?This is defined as the rate at which velocity changes with time and it has a direct relationship with pressure.
This however means that when pressure decreases there will be a corresponding decrease in acceleration and vice versa.
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What is the numbers of molecules for 65.8g of CO2?
Answer:
One gram of carbon dioxide contains 13.6 x 10²¹ number of molecules.
Explanation:
Answer:
1.50 moles
Explanation:
use dinemential analysis
find the molar mass
Lithium Oxide (Li2O) is a highly reactive chemical species which reacts to give electrons to other atoms, following a general reaction scheme of:
Li2O + X → LiX + O2
Data were collected from a series of reactions involving lithium oxide and one other element.
Which statement is best supported by the evidence in the table?
The ionization energy of oxygen is lower than that of boron, beryllium, and lithium.
The electronegativity of oxygen is lower than that of fluorine, carbon, and nitrogen.
The electronegativity of oxygen is higher than that of boron, beryllium, and lithium.
The ionization energy of oxygen is higher than that of fluorine, carbon, and nitrogen.
Answer:
I think that A is the correct answer might not be
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15.0 g of water at 0.0 °C are added to 40.0 g of water at 40.0 °C. What is the final
temperature of the mixture?
Answer:
40.0 c
Explanation:
Answer:
29.09 degree Celsius is final temperature
how do x rays use electromagnetic waves?
Answer:
X-rays are a form of electromagnetic radiation, similar to visible light. Unlike light, however, x-rays have higher energy and can pass through most objects, including the body. Medical x-rays are used to generate images of tissues and structures inside the body.
Explanation:
What is the compound name for this compound structure?
The compound name for the compound structure given in the question is 2, 3-dimethlypentane
IUPAC nomenclatureThe international union of pure and applied chemistry (IUPAC) has organised a principle by which organic compounds are named. This principle includes:
Identify the functional group Locating the longest continuous carbon chain. This gives the parent name of the compound. Identified the substituent groups attached Give the substituent groups the lowest low count Combine the above to get the nameHow to name the compound The functional group is alkane since it contains only single bonds The longest continuous carbon chain is 5. Thus the parent name is pentane. Two methyl (CH₃) groups are attached The methyl (CH₃) groups are located at carbon 2 and 3The name of the compound is 2, 3-dimethlypentaneLearn more about IUPAC nomenclature:
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Balance the following equation. Fill in the blanks
( ? )NaCl + ( ? ) AgNO3 → ( ? )AgCl + ( ? ) NaNO3
NaCl+AgNO_3-->AgCl+NaNO_3
on both sides
Na=1Ag=1Cl=1NO_3=1Hence it's balanced already
the measured mass of a sample would have which units
Answer:
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The measured mass of a sample would have unit as "Kilogram "
the carbon atom which becomes asymmetric when the straight chain form of monosaccharide change into ring form is known as____\
Answer:
CARBOHYDRATES AND CARBOHYDRATE METABOLISM
If 32.00 mL of a solution of Ca(OH)2 requires 16.08 mL of a 2.303 M solution of HNO2 for complete titration, what is the molarity of the Ca(OH)2 solution?
For the equilibrium that exists in an aqueous solution of nitrous acid ... calcium hydroxide is dissolved in water until the pH of the solution is 11.44.
Explain contact process
Answer:
contact process, modern industrial method of producing sulfuric acid; it has largely replaced the chamber, or lead-chamber, process. Sulfur dioxide and oxygen, passed over a hot catalyst, unite to form sulfur trioxide, which in turn combines with water to make sulfuric acid.
20 L of nitrogen gas are collected at a temperature of 50°C and 2 atm. How many grams of nitrogen gas were collected?
Answer:
0.1077 grams
Explanation:
First we will employ the ideal gas law to determine the number of moles of nitrogen gas.
PV=nRT
P=2 atm
V=20L
R=0.08206*L*atm*mol^-1*K^-1
T=323.15 K
Thus, 2atm*20L=n*0.08206*L*atm*mol^-1*K^-1*323.15K
K, atm, and L cancels out. Thus n=2*20mol/0.08206*323.15=1.5 moles
Lastly, we must convert the number of moles to grams. This can be done by dividing the number of moles by the molar mass of nitrogen gas, which is 14 grams.
1.5/14=0.1077 grams
A 0.506 g sample of solid calcium hydroxide was dissolved in some water and then titrated with 28.85 mL of hydrochloric acid to neutralize. What was the molarity of the hydrochloric acid (M)? (Start by writing and balancing the reaction.)
A 0.506 g sample of solid calcium hydroxide was dissolved in some water and then titrated with 28.85 mL of hydrochloric acid to neutralize, then the molarity of HCl is 0.471 M.
How do we calculate molarity?Molarity will be calculated by using the below equation as:
M = n/V, where
V = volume of solvent
n is the moles of solute and it will be calculated by using the below equation:
n = W/M, where
W = given mass
M = molar mass
Given chemical reaction is:
Ca(OH)₂ + 2HCl → CaCl₂ + 2H₂O
Moles of Ca(OH)₂ = 0.506g / 74.093g/mol = 0.0068 mol
From the stoichiometry of the reaction:
0.0068 moles of Ca(OH)₂ = reacts with 2×0.0068 = 0.0136 moles of HCl
Given volume of HCl = 28.85mL = 0.02885 L
On putting values on the molarity equation, we get
M = 0.0136 / 0.02885 = 0.471 M
Hence required molarity of HCl is 0.471 M.
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what is haber's process?
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Answer:
The Haber process, also called the Haber–Bosch process, is an artificial nitrogen fixation process and is the main industrial procedure for the production of ammonia today. It is named after its inventors, the German chemists Fritz Haber and Carl Bosch, who developed it in the first decade of the 20th century.
Answer:
a catalytic process for synthesizing ammonia from nitrogen and hydrogen
Explanation:
what happens when ethanol reacts with alkaline potassium permanganate?
Answer:When ethanol is oxidised with alkaline potassium permanganate (alkaline KMnO 4) or acidified potassium dichromate (acidified K 2 Cr 2 O 7), ethanoic acid is formed. Alkaline potassium permanganate and acidified potassium dichromate are strong oxidising agents, as they provide oxygen for oxidising other substances in the reaction
Explanation: