Answer:
B
Explanation:
Shows actual sacrifice in order to train and be the best.
Answer:
b
Explanation:
CH3 – CH2 – CH2 – CH2 – OH
Answer:
IUPAC name is butanol
I hope it's helps you
In the reaction A+B → C + D, what are the reactants?
Answer:
A and B
Explanation:
how can we reduce air pollution
Answer:Ways to Reduce Air Pollution
Riding a bike or walking instead of driving.
Taking a bus or carpooling.
Buying a car that has greater fuel efficiency.
Turning off lights and appliances when they are not in use.
Using energy efficient light bulbs and appliances.
Buying fewer things that are manufactured using fossil fuels.
Explanation: no explanation
Will Mark Brainliest.
1. Analysis of a hydrate of iron(III) chloride revealed that in a 10.00g sample of hydrate, 6.00 g is anhydrous iron(III) chloride and 4.00 g is water. Determine the formula and the name of the hydrate.
Answer:
FeCl₃ . 6H₂O, BRAINLIST PLZ
Explanation:
1) The chemical formula of iron(III) chloride is FeCl₃ (the oxidation number of Fe is 3+, and the oxidation number of Cl is 1-).
2) The formula that you are lookin for the hydrate is of the type FeCl₃ . n H₂O, where n is the number of water molecules per each unit formula of Fe₂O₃.
3) Find the mass of anhydrous FeCl₃ by difference:
mass of FeCl₃ = mass of the sample - mass of the water in the sample
mass of FeCl₃ = 5.49g - 2.20 g = 3.29 g
4) Convert the mass of FeCl₃ in number of moles
number of moles = mass in grams / molar mass
molar mass of FeCl₃ = 55.845 g/mol + 3×35.453 g/mol = 162.204 g/mol
number of moles = 3.29 g / 162.204 g/mol = 0.0203 mol FeCl₃
5) Convert the mass of water in number of moles:
molar mass of water = 18.015 g/mol
number of moles of water = mass in grams / molar mass = 2.20 g / 18.015 g/mol = 0.122 moles H₂O
6) Find the mole ratio of water to iron chloride:
0.122 mol water / 0.0203 mol iron chloride = 6.01 ≈ 6
Therefore, the complete formula of the hydrate is FeCl₃ . 6H₂O,
An empirical formula calculation gives a molar ratio of 1.0 oxygen, 4.8 hydrogen, 4.1 carbon and 1.8 nitrogen. If the molecular mass is approximately 200 amu, what is the molecular formula
Answer:
[tex]C_8H_{10}O_2N_4[/tex]
Explanation:
Hello there!
In this case, according to the given information about the empirical formula of this compound, we can infer that these mole ratios can be rounded to the following whole numbers in order to find the empirical formula:
[tex]C_4H_5ON_2[/tex]
Whose molar mass is 97.09 amu and thus, the ratio of the molecular to the empirical molar mass is:
[tex]200/97.09=2.1[/tex]
Which is almost a factor of 2; and therefore, the resulting molecular formula is:
[tex]C_8H_{10}O_2N_4[/tex]
Regards!
If 50mL of 0.15M calcium sulfide is added to 30mL of 0.35M ammonium carbonate, how many grams of precipitate will form
Answer:
0.750 g
Explanation:
The reaction that takes place is:
CaS (aq) + (NH₄)₂CO₃ (aq) → CaCO₃ (s) + (NH₄)₂S (aq)First we calculate how many moles of each reactant were added, using the given volumes and concentrations:
CaS ⇒ 50 mL * 0.15 M = 7.5 mmol CaS(NH₄)₂CO₃ ⇒ 30 mL * 0.35 M = 10.5 mmol (NH₄)₂CO₃Given that they react in a 1:1 ratio, and that there are less CaS moles than (NH₄)₂CO₃ moles, CaS is the limiting reactant.
7.5 mmoles of CaS will produce 7.5 mmoles of CaCO₃.We now convert 7.5 mmol CaCO₃ into mg, using its molar mass:
7.5 mmol * 100 mg/mmol = 750 mgFinally we convert 750 mg to g:
750 mg / 1000 = 0.750 gAt 300.0 K and 0.987 atm pressure, what will be the volume of 2.30 mol of Ne?
Answer:
V = 57.39 L
Explanation:
Given that,
Temperature, T = 300 K
Pressure, P = 0.987 atm
No. of moles of Ne, n = 2.30 mol
We need to find the volume of Ne. We know that, the ideal gas law is as follows :
PV = nRT
Where
P is pressure and R is gas constant
[tex]V=\dfrac{nRT}{P}\\\\V=\dfrac{2.3\times 0.0821\times 300}{0.987 }\\\\V=57.39\ L[/tex]
So, the volume of the Ne is 57.39 L.
Matter is never created or destroyed.
Lesson 5.04
Question 7 options:
True
False
Determine the packing efficiency of a simple cubic unit cell that contains one atom with a metallic radius of 175 pm.
Answer:
the packing efficiency is 52.36%
Explanation:
Given the data in the question;
simple cubic unit cell that contains one atom with a metallic radius of 175 pm;
we know that;
Edge length of Simple cubic (a) is related to radius of atom (r) as follows;
a = 2r
since radius r = 175 pm
we substitute
a = 2 × 175 pm
a = 350 pm
Now we get the volume unit;
Volume of unit cell = a³ = ( 350 pm ) = 42875000 pm³
Next we get Volume of sphere;
Volume of Sphere = [tex]\frac{4}{3}[/tex]πr³
Volume occupied by 1 atom = [tex]\frac{4}{3}[/tex] × π × ( 175 pm )³
= [tex]\frac{4}{3}[/tex] × π × 5359375 pm³
= 22449297.5 pm³
Now, the packing efficiency = ( Volume occupied by 1 atom / Volume of unit cell ) × 100
we substitute;
packing efficiency = ( 22449297.5 pm³ / 42875000 pm³ ) × 100
= 0.523598 × 100
= 52.36%
Therefore, the packing efficiency is 52.36%
Draw the most stable form of the organic products formed in the reaction of ethyl acetate and ethyl benzoate. Ethanol can be excluded from the answer.
Answer:
Please find the solution in the attached file.
Explanation:
If 45.6 g of Fe2O3 reacts with excess water, how much heat is required?
Explanation:
I
have not yet learnt chemistry so sorry
Answer:
350
Explanation:
????????????????????????
3. The speed of a reaction can be increased by increasing reactant concentration or decreasing
particle size. *
(1 Point)
True
False
Answer:
true
because with the both states we increase the surface of reaction
How many hydrogen atoms are in 89.5 g of
C6H6 ?
Answer in units of atoms.
Solution :
Molar mass of [tex]C_6H_6[/tex] is :
M = 6×12 + 6×1 g
M = 78 g
78 gram of [tex]C_6H_6[/tex] contains [tex]6.022 \times 10^{23}[/tex] molecules.
So, 89.5 gram of [tex]C_6H_6[/tex] contains :
[tex]n = 6.022 \times 10^{23} \times \dfrac{89.5}{78}\\\\n = 6.91 \times 10^{23}[/tex]
Now, from the formula we can see that one molecule of [tex]C_6H_6[/tex] contains 2 hydrogen atom . So, number of hydrogen atom are :
[tex]h = 2\times 6.91 \times 10^{23}\\\\h = 1.38 \times 10^{22}\ atoms[/tex]
Hence, this is the required solution.
Experiment 41 Advance Study Assignment: Preparation of Aspirin 1. Calculate the theoretical yield of aspirin to be obtained in this experiment, starting with 2.0 g of salicylic acid and 5.0 mL of acetic anhydride (density
Answer:
The theoretical yield of aspirin is 2.61g
Explanation:
The balanced equation is
Salicylic acid + Acetic anhydride ---> Acetylsalicylic acid + Acetic acid
Number of moles salicylic acid = (2.0g) / (138 g/mol) = 0.0145 mol
Mass of acetic anhydride = (1.08g/ml ) * (5.0 mL) = 5.4g
Number of moles of acetic anhydride = 5.4g / (102g/mol) = 0.0529 mol
As we can see in the reaction equation
1 mol of acetic anhydride produce 1 mol aspirin
OR
0.0145 mol salicylic acid produces 0.0145 mol aspirin.
Mass of aspirin produced = 0.0145 mol * (180.157g/mol)
The theoretical yield of aspirin is 2.61g
Rachard is studying a sample of a substance. The sample is in a large, triangle-shaped flask. Rachard moves the sample to a small, rectangular container. Both containers are closed. Below is an image of the containers used by Rachard. She notices that the shape and the volume of the substance both change when the sample is moved. In which state of matter is the substance?
wwwwwwwwwwwwwwwwwwwwwwwweweewewwewweewweeweeweeweweweeeweew
Explanation:
Simply multiply the # of moles of O2 by a molar ratio to give the # of moles of MgO:
#moles O2 × (2 mol MgO/1 mol O2) = # moles of MgO
where the quantity inside the parenthesis is the molar ratio between MgO and O2.
if 9.2 g of calcium react completely with excess aluminum chloride how many grams of aluminum would be produced?
Ca + AlCl3 -> CaCl2 + Al
Explanation:
3Ca(s) + 2AlCl3(aq) -> 3CaCl2(aq) + 2Al(s)
According to the question, Ca is the limiting reactant.
Therefore, we equate Ca to Aluminium which is the product whose mass we want to find
Molar mass of Ca- 40g/mol
". ". of Al- 27g/mol
3Ca --> 2Al
3×40 --> 2×27
9.2 --> x
x = 9.2×2×27= 496.8÷120=4.14
Which statement about the half-life of a radioactive sample is true?
A. It is an exact measure of the decay of an individual atom.
B. It measures the tendency of a radioisotope to decay radioactively.
C. It is affected by the concentration of the radioactive substance that is present.
D. It can be calculated based on neutron number.
Answer:
The correct answer is - B. It measures the tendency of a radioisotope to decay radioactively.
Explanation:
The half-life of the radioactive sample is the time it takes to decay to its half amount of the unstable nuclei of its initial amount. It is radioactively decays to its half value or in simple words, it takes the time to decay an unstable nuclei to decay to its half value.
It can take milliseconds to million years to disintegrate the different unstable nuclei of a radioactive substance to disintegrate its half amount to a stable substance.
Answer:
B. It measures the tendency of a radioisotope to decay radioactively.
Explanation:
Chem Hnrs EDGE 2021
This is an riddle.
I’m lighter than what I am made of and more of me is hidden than is seen. What am I?
Whoever answers correctly gets brainly.
Answer: The answer is Iceberg
Answer:
Is it an iceberg?
Explanation:
it floats in water
and you can only see the tip of an iceberg
Hope this helps! :)
Have a great weekend!!
A solution of carbon tetrachloride and acetic acid (CH3COOH) that is 50% carbon tetrachloride by mass is boiling at 98.6 °C. The vapor is collected and cooled until it condenses to form a new solution. Calculate the percent by mass of carbon tetrachloride in the new solution.
Answer:
The percent by mass of carbon tetrachloride in the new solution is 72.6
Explanation:
Molecular weight of Carbon Tetrachloride is 154 g/mol
Molecular weight of CH3COOH is 60g/mol
Mass fraction of CCl4 is 0.5
Mass fraction of CCl4 is (0.5/154)/{(0.5/154) + (0.5/60)}
Mass fraction of CCl4 is X = 0.2803 and Y = 1-X
As per Raoul’s law
Y Pt = X * P1
Pt = X * P1 + YP2
Pt = 0.2803 * 1377 + (1-0.2803) * 519
Pt = 759.557 torr
Substituting the given values we get
Y1 = X1P1/Pt
Y1 = 0.2803 * 1377/759.557
Y1 = 0.508
Mass fraction
(0.508)(154)/{( (0.508)(154)) + (1-0.508)(60)}
= 0.726 = 72.6 %
Calculate the volume, in liters, occupied by 0.775 mol of oxygen gas at STP.
Answer:
17.4 L
Explanation:
Step 1: Given data
Moles of oxygen (n): 0.775 molPressure of the gas (P): 1 atm (standard pressure)Temperature of the gas (T): 273.15 K (standard temperature)Step 2: Calculate the volume occupied by 0.775 moles of oxygen at standard temperature and pressure (STP)
At STP, 1 mole of an ideal gas occupies 22.4 L.
0.775 mol × 22.4 L/1 mol = 17.4 L
Plzzzzzzzzz help
It's your 16th birthday. You've been given 1 penny every second since you were born. You want to use all that money to buy gold to make rings for your classmates. How many rings can you make? Useful information: 1 ring = 1.3 mL of gold, 1 gram of gold = $58, density of gold is 19.3 grams/mL
Explanation:
Since you're 16, you have to calculate how many seconds you've lived.
16 years × 31,536,000= 504,576,000 pennies.
504,576,000÷58 (for the amount of gold) = 8699586.2069 grams
Then go on from there. Hope that helped!
What are the characteristics of acids and bases, and some examples of each? (20%)
Answer:
Acid :
1) they are sour in taste
2) if we put litmus paper in an acid they turn blue litmus to red and ( red litmus paper colour doesn't change )
3) acids use to react with metals
4) it releases hydrogen (H+) when dissolved in water
5) example : Hydrochloric acid , sulphuric acid , nitric acid etc..
base :
1) they are bitter in taste
2) and the red litmus paper trunes to blue and ( red litmus paper colour doesn't change )
3) it doesn't react with metals
4) it releases hydroxide (OH+) when dissolved in water
5 example : sodium hydroxide, potassium hydroxide etc...
Chem. Question! Which would be the correct asnwer?
Answer:
The valence shells of the atoms are overlapping.
Explanation:
Have a great day
ILL GIVE BRAINLY PLEASE HELP!
One of the main components of an airbag is the gas that fills it. As part of the design process, you need to determine the exact amount of nitrogen that should be produced. Calculate the number of moles of nitrogen required to fill the airbag. Show your work. Assume that the nitrogen produced by the chemical reaction is at a temperature of 495°C and that nitrogen gas behaves like an ideal gas. Use this fact sheet to review the ideal gas law.
Answer: airbags generally vary between 35 and 60 liters in volume and for the airbag system to activate, it takes about 20 Kgf/cm² of pressure; with this data taken from literature and knowing the temperature of reaction (495 °C), we determine the moles of nitrogen needed from the ideal gas law.
Explanation:
The chemical structures of eugenol and iso eugenol differ in what way?
a)Alkene location on aliphatic chain
b)Alkene geometry on aliphatic chain
c)Substitutions on the aromatic ring
d)These compounds are diastereomers of one another.
Please help me anyone
Answer:
The answer to your question is given below
Explanation:
To prepare 3 M solution of NaOH, do the following:
1. Determine the number of mole of NaOH in the solution. This can be obtained as follow:
Molarity of NaOH = 3 M
Volume = 1 L
Mole of NaOH =?
Mole = Molarity × Volume
Mole of NaOH = 3 × 1
Mole of NaOH = 3 moles
2. Determine the mass of 3 moles of NaOH. This can be obtained as follow:
Mole of NaOH = 3 moles
Molar mass of NaOH = 23 + 16 + 1
= 40 g/mol
Mass of NaOH =?
Mass = Mole × molar mass
Mass of NaOH = 3 × 40
Mass of NaOH = 120 g
3. Measure 120 g of NaOH and dissolve in 1 L of water in a volumetric flask to produce 3 M of the solution.
When CO2(g) is put in a sealed container at 730 K and a pressure of 10.0 atm and is heated to 1420 K , the pressure rises to 24.1 atm . Some of the CO2 decomposes to CO and O2.
Calculate the mole percent of CO2 that decomposes.
Express your answer using two significant figures.
Answer:
48%
Explanation:
Based on Gay-Lussac's law, the pressure is directly proportional to the temperature. To solve this question we must assume the temperature increases and all CO2 remains without reaction. The equation is:
P1T2 = P2T1
Where Pis pressure and T absolute temperature of 1, initial state and 2, final state of the gas:
P1 = 10.0atm
T2 = 1420K
P2 = ?
T1 = 730K
P2 = 10.0atm*1420K / 730K
P2 = 19.45 atm
The CO2 reacts as follows:
2CO2 → 2CO+ O2
Where 2 moles of gas react producing 3 moles of gas
Assuming the 100% of CO2 react, the pressure will be:
19.45atm * (3mol / 2mol) = 29.175atm
As the pressure rises just to 24.1atm the moles that react are:
24.1atm * (2mol / 19.45atm) = 2.48 moles of gas are present
The increase in moles is of 0.48 moles, a 100% express an increase of 1mol. The mole percent that descomposes is:
0.48mol / 1mol * 100 = 48%
Please help! Virtual Chemical vs Physical changes
Answer:
Sometimes, it can be difficult to tell if a chemical or physical change is taking place. In the video, Dr. Jeff and the team explore a few different reactions to determine if they are chemical or physical changes, by figuring out if the material made after the reaction was present before the reaction. Chopping a banana.
Explanation: