A pycnometer is a glass apparatus used for accurately determining the density of a liquid. When dry and empty, a certain pycnometer had a mass of 27.056 g. When filled with distilled water at 25.0°C, it weighed 36.773 g. When filled with chloroform (a liquid once used as an anesthetic before its toxic properties were known), the apparatus weighed 41.451 g. At 25.0°C, the density of water is 0.99704 g/mL
Complete Question
A pycnometer is a glass apparatus used for accurately determining the density of a liquid. When dry and empty, a certain pycnometer had a mass of 27.056 g. When filled with distilled water at 25.0°C, it weighed 36.773 g. When filled with chloroform (a liquid once used as an anesthetic before its toxic properties were known), the apparatus weighed 41.451 g. At 25.0°C, the density of water is 0.99704 g/mL
-What is the volume of the pycnometer (mL)
We have that the volume of the pycnometer in mL is
[tex]V=9.111mL[/tex]
From the Question we are told that
Pycnometer mass of [tex]m_p=27.056 g.[/tex]
Temperature [tex]T=25 \textdegree[/tex]
Pycnometer filled with distilled water [tex]m_{pf}= 36.773 g[/tex]
Apparatus weighed [tex]w=41.451 g[/tex]
Density of water [tex]\rho= 0.99704 g/mL[/tex]
Generally the equation for Density is mathematically given as
[tex]\rho=\frac{mass}{Volume}[/tex]
Since pycnometer is filled with water its volume can be defined by the volume of water in it
Therefore
Mass of water Pycnometer filled with distilled water-Pycnometer mass
[tex]M_w=36.773 -27.056\\\\M_w=9.084g[/tex]
Hence
[tex]V=\frac{9.084g}{0.99704 }[/tex]
[tex]V=9.111mL[/tex]
in conclusion
The volume of the Pycnometer in mL is
[tex]V=9.111mL[/tex]
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Determine the number of meters in 1.00 miles
Answer:
There are 1609.344 meters in a mile
Explanation:
There are different atoms and each type of atom is called
imagine you find a bowl filled with clear liquid in your kitchen list three liquids it might be
Answer: Three liquids that could fill a bowl with clear liquid in your kitchen could be alcohol, dish soap, juice (without pectin or pulp), sports drinks, and water (carbonated, coconut, flavored, or plain).
phillip morris cigaretteshave 5mg tar and 0.4 mg nicotine per cigarette and 20 cigarettes per pack how many packs of cigarettes would have to be smoked to coat your lungs with 4.0 oz (1/4 lb) of tar? How many packs of cigarettes would have to be smoked to introduce your lungs to one gram of nicotine?
Answer: A solution is made by dissolving 27.8 g of nicotine (Molar Mass = 160 g/mol) in 145 g of cyclohexane (C6H12) to form 142 mL of solution. Calculate the mole fraction of the solute and the molarity, respectively, of this solution.
Explanation:
HELP I WILL MARK YOU AS THE BRAINLIEST ANSWER
The atomic radii of elements on the periodic table generally _______ from left to right and _______ from top to bottom.
A.
increase; decrease
B.
decrease; increase
C.
stay the same; increase
D.
increase; increase
Hey there! Here is the answer:
B.) decrease; increase
Here's why:
As you move from left to right across a period on the periodic table the size of an atom will decrease. As you move from top to bottom down a group on the periodic table the size of an atom will increase.
I really hope this answer helps you out! :)
6. Convert the following measurements to the indicated units,
a. 238.4 mm to m
b. 0.00355 L to mL
c. 48.6 s to h
d. 6.50 oz to mL
Answer:
C
Explanation:
hahhahahabhahahahahahhahaha
neutral atoms of all the isotopes of the same element have
Answer:
electron = proton
Explanation:
write about injector use in gas chromatography in detail. (don't copy from online sites )
Answer:
Gas chromatography is a common type of chromatography used in analytical chemistry for separating and analyzing compounds that can be vaporized without decomposition. Typical uses of GC include testing the purity of a particular substance, or separating the different components of a mixture. In preparative chromatography, GC can be used to prepare pure compounds from a mixture
as chromatography is a term used to describe the group of analytical separation techniques used to analyze volatile substances in the gas phase. In gas chromatography, the components of a sample are dissolved in a solvent and vaporized in order to separate the analytes by distributing the sample between two phases: a stationary phase and a mobile phase. The mobile phase is a chemically inert gas that serves to carry the molecules of the analyte through the heated column. Gas chromatography is one of the sole forms of chromatography that does not utilize the mobile phase for interacting with the analyte. The stationary phase is either a solid adsorbant, termed gas-solid chromatography (GSC), or a liquid on an inert support, termed gas-liquid chromatography (GLC).
Introduction
In early 1900s, Gas chromatography (GC) was discovered by Mikhail Semenovich Tsvett as a separation technique to separate compounds. In organic chemistry, liquid-solid column chromatography is often used to separate organic compounds in solution. Among the various types of gas chromatography, gas-liquid chromatography is the method most commonly used to separate organic compounds. The combination of gas chromatography and mass spectrometry is an invaluable tool in the identification of molecules. A typical gas chromatograph consists of an injection port, a column, carrier gas flow control equipment, ovens and heaters for maintaining temperatures of the injection port and the column, an integrator chart recorder and a detector.
To separate the compounds in gas-liquid chromatography, a solution sample that contains organic compounds of interest is injected into the sample port where it will be vaporized. The vaporized samples that are injected are then carried by an inert gas, which is often used by helium or nitrogen. This inert gas goes through a glass column packed with silica that is coated with a liquid. Materials that are less soluble in the liquid will increase the result faster than the material with greater solubility.The purpose of this module is to provide a better understanding on its separation and measurement techniques and its application.
Explanation:
Purpose of gas chromatography
The main purpose of the gas chromatography technique is to separate the compounds that possess:
High volatility Low molecular weights Thermal stabilityhey please help man...
1. Cations are ____________ charged and have less ____________than ____________.
2. Anions are ____________ charged and have more ____________ than ____________.
3. Columns on the periodic table are known as ____________.
4. The elements in the first group are called ____________ and have ____________
valence electron(s).
Answer:
1. Cations are positively charged and have less electrons than protons.
2. Anions are negatively charged and have more electrons than protons.
3. Columns on the periodic table are known as groups.
4. The elements in the first group are called alkalis metals and have one valence electron.
Explanation:
How many molecules are present in 2 H₂ SO4
Answer:
in H2So4 splits in 2 H+ and a
so42 -particle=3particle per mole.So2
moles H2So4 will result in 3*2=6moles
of molecules.
Explanation:
The molecules are present in 2 H2 SO4 is 7
Why is it important to use chemicals of high quality (purity) and exact(correct) concentrations in experiments?
Answer:
To produce good or targeted result
It is important to use chemicals of high quality and correct concentrations in experiment so that we can obtain the predictable result in an experiment
Purity of substances/chemicals is very important when performing experiments in the laboratories, because it plays an important role in the determination of the chemical properties of substances which will have a direct effect on the result obtained from the experiment. likewise using the correct concentration of reagents
During experiments to obtain the best/predictable result in an experiment it is of best practice to make use of chemicals of high quality and also at the exact(needed) concentrations, that way the predictable result of the experiment will be obtained.
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The best type of graph to show how data changes over time would be:
Answer:
The answer would be a line graph because it is used to track changes over time.
Which information about an atom can a period number give you?(1 point)
A_ how many bonds it will make
B_ how many energy levels it has
C_ the number of valence electrons it has
D_ the ionic charge it forms
Answer:
A
Explanation:
In the laboratory you dissolve 19.4 g of sodium chloride in a volumetric flask
and add water to a total volume of 375 mL.
What is the molarity of the solution? In M. What is the concentration of the sodium cation? In M. What is the concentration of the chloride anion? In M.
Answer: 0.885 M
Explanation: 19.4 grams of NaCl is (19.4g/58.55 g/mole) = 0.332 moles of NaCl. 375ml is 0.375 liters. Molar is moles per liter: (0.332 moles NaCl/0.375 liters) = 0.885 M
Which of the following sets of elements has the same chemical properties?
A) F, CI, Te
B) Li, Na, Ba
C) Cu, Ag, Au
D) U, P, Si
What is Evaporation and evaluation
Evaporation is one of the largest water losses from most of the dam lakes in Iran. Estimating the evaporation rate enables us to apply the proper evaporation mitigation technologies. In this study, the feasibility of different evaporation estimation methods was studied to find an optimum method with a fair tradeoff between cost and accuracy. The optimum method may vary depending on the climate. We found Penman, Montieth and Unsworth (PMU) method as the optimum estimation method applicable Karaj dam lake (located north west of Tehran, Iran). For validation, we used the filed measurements for 2005. The reason is that the PMU is highly sensitive to wind velocity and only for 2005 the meteorological data contained the wind velocity. For the sky clarity, we used the 22-year average sky clarity of Karaj dam lake in augusts (i.e. 80%). The PMU model is found to provide consistent results with filed measurements (less than 2% error). For example, from 2 nd to 15 th of August 2005, the PMU model predicts 7.98 ± 0.83 mm/day evaporation and field measurement for the same period was 8.13 ± 0.01 mm/day.
Please help me please find the answer
Please do this
Please do this
Plzz
Plzz
Total distance=60m+40m=100m
Total Time=6+4=10s
#a
[tex]\boxed{\sf Speed=\dfrac{Distance}{Time}}[/tex]
[tex]\\ \sf\longmapsto Speed=\dfrac{100}{10}[/tex]
[tex]\\ \sf\longmapsto 10m/s[/tex]
#b
Displacement=AC=60m
[tex]\\ \sf\longmapsto Velocity=\dfrac{Displacement}{Time}[/tex]
[tex]\\ \sf\longmapsto Velocity=\dfrac{60}{10}[/tex]
[tex]\\ \sf\longmapsto 6m/s[/tex]
#C
Distance=60m
time=5s
[tex]\\ \sf\longmapsto Velocity=\dfrac{60}{5}=12m/s[/tex]
#d
The velocity of A to C is greater than Velocity from C to A
After the addition of all the reagents and NMI to the alcohol being converted to an aldehyde, the color of the reaction mixture changes from:________.
a. green to brown
b. clear to blue
c. clear to reddish brown
d. clear to green
write the symptoms of Tuberculosis
Answer:
Hi, There! Your Answer is Below!
Coughing for three or more weeks.
Coughing up blood or mucus.
Chest pain, or pain with breathing or coughing.
Explanation:
Tuberculosis (TB) is a disease caused by germs that are spread from person to person through the air. TB usually affects the lungs, but it can also affect other parts of the body, such as the brain, the kidneys, or the spine. A person with TB can die if they do not get treatment.
Question 1 (6 points) a. Fill in the blanks in the following paragraph to correctly describe the nucleus of an atom. (1 point)and are the two types of nucleons that make up a nucleus. The force exists between in the nucleus because of their charge. Because it is repulsive, this force tends to make a nucleus . However, the force acts between protons, between neutrons, and between protons and neutrons. This force helps to make a nucleus , because it is always attractive.
Answer: No blnks, but I'll do my best.
Proton and neutrons
unstable
nuclear
stable
Explanation: Requires ISP to see the blanks
Natural gas is mostly methane, a substance that boils at a temperature of 109 K
. What is its boiling point in °C
and °F?
Kelvin is the absolute unit of temperature. Temperature values can be converted from one unit to another using conversion factors.
Given that;
[tex]T^oc =[/tex] temperature in °C
T(K) = temperature in kelvin
[tex]T^oc + 273 = T(K)\\T^oc = T(K) - 273\\T^oc = 109 K - 273 \\T^oc = -164^oc[/tex]
To convert from °C to °F
[tex]\frac{9}{5} ^oC = ^oF - 32[/tex]
°F = 9/5 * (-164 °C) + 32
= -263.2 °F
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How much of Earth's fresh water is stored in the cryosphere?
O A. 1/6
B. 1/2
C. 9/10
OD. 2/3
Reset Selection
Answer:
1/6
Explanation:
Because cryosphere does not much water
How many moles are in 237.7 g of Ba(OH)2? Answer in units of mol.
Answer: 1.387 moles Ba(OH)2
Explanation: Molar mass of Ba(OH)2 is 171.3 grams/mole
(237.7 grams)/(171.3 grams/mole) = 1.3876 moles
what is meant by Orion? for grade 10
Answer:
[Latin (genitive Orionis)] : a constellation on the equator east of Taurus represented on charts by the figure of a hunter with belt and sword. 2 : a giant hunter slain by Artemis in Greek mythology.
Explanation:
Answer:
a constellation on the equator east of Taurus represented on charts by the figure of a hunter with belt and sword. 2 : a giant hunter slain by Artemis in Greek mythology
Orion constellation is one of the brightest and best known constellations in the night sky. It lies on the celestial equator. Orion has been known since ancient times. The constellation is also known as the Hunter, as it is associated with one in Greek mythology.
if the rate of decomposition of ammonia, NH3, at 1150 K is 2.10×10^-6 M/s, what is the rate of production of nitrogen and hydrogen?
Answer:
the rate of decompositibro2o
Explanation:
the rate of decomposition is br02
Please help ASAP!!!!!!!!!
Answer:
Insulation acts as a conductor to heat flow
Explanation:
Insulation helps increase the energy efficiency of your home by reducing the amount of heat that escapes from it in the winter.
Answer:
Insulation acts as a barrier to heat flow.
Explanation:
i hope it helps
To explain the photoelectric effect, Albert Einstein linked the photoelectric effect to an idea from which scientist?
Heinrich Hertz
Isaac Newton
Max Planck
Thomas Young
Answer:
C. Max Planck
Explanation:
IM JUST HIM
what variables do not affect mass? (include observations)
A variable is a property, element or factor that is changeable
The variables that do not affect mass includes:
LocationSpeed or accelerationSurface areaTimeTemperatureThe reason why the above variables are said not to affect mass is as follows:
Mass is a measure of inertia of resistance to motion of a body
In an experiment to determine the variables that affect mass using paper clips, a simple balance, adhesives, a cardboard, and marker or pen, the balance is made level by placing a mass in one of the pan holders and the paper clips in the other
The simple balance will remain or return to the level position when;
The paper clips are rearranged in the pan: Location
Dropped from height unto the pan: Speed and acceleration
Broken into pieces and placed back into the pan: Surface area
Left in the same position for some time: Time
Heated by applying an heat source and then removing the heat source: Temperature
Therefore, location, speed or acceleration, surface area, time and temperature do not affect mass
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plz do this i need help ill give u brailiest
1. C
2. B
3. B
4. sorry, but we cant see the pictures. thats all I can do.
-Chad
Answer:
(1) Turgor, an internalstimulus, refers to energy in a plant cell.
(2) Osmosis moves materials in and out of the plant cell from areas of low to high concentration?
(3) When a plant is hypertonic,what is happening in the plantcell, and what will the plantlook like?
→ A. The vacuole is not full and the plant is wilted.
(4) What picture at the bottom of the page represents equilibrium orbalance in a cell?
→ Sorry the picture is not given
