Answer:
C. Max Planck
Explanation:
IM JUST HIM
How many moles of oxygen atoms are there in 1 mole of Mg(NO3)2?
Answer:6 moles
Explanation: u said atoms so O₁ = 1 mole so there is a total of 6 atoms of oxygen so 6 moles is the ans.
Determine the number of meters in 1.00 miles
Answer:
There are 1609.344 meters in a mile
Explanation:
neutral atoms of all the isotopes of the same element have
Answer:
electron = proton
Explanation:
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
What are the variables used in an experiment? How are they different?
Answer:
There are many items that could be altered to test the reaction of another. These changing quantities are called variables. A variable is any factor, trait, or condition that can exist in differing amounts or types. An experiment usually has three kinds of variables: independent, dependent, and controlled.
Explanation:
What is brady's reagent, and what is it's function?
Answer:
Brady's reagent or Borche's reagent, is prepared by dissolving 2,4-dinitrophenylhydrazine in a solution containing methanol and some concentrated sulfuric acid. This solution is used to detect ketones and aldehydes.
Answer:
It is 2,4-dinitrophenylhydrazine, it confirms presence of a carbonyl functional group [ hydrazine and ketone ]
Explanation:
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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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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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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 stabilityAfter 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
heterogeneous mixture homogeneous
How are they similar?
Answer:
By definition, a pure substance or a homogeneous mixture consists of a single phase. A heterogeneous mixture consists of two or more phases. When oil and water are combined, they do not mix evenly, but instead form two separate layers. Each of the layers is called a phase.
Explanation:
Someone answer this tysm
Answer:
D: The energy of objects that are moving
Answer:
The energy of objects that are moving.
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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
Please help me please find the answer
Please do this
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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
i need help with unit conversion
Answer:
what is it?
Explanation:
you haven't said?
How do you Convert 312 kelvin too 100 Fahrenheit?
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
How can constraints be used to help define the problem?
Answer: Constraints are restrictions (limitations, boundaries) that need to be placed upon variables used in equations that model real-world situations. It is possible that certain solutions which make an equation true mathematically, may not make any sense in the context of a real-world word problem.
Explanation:
Constraints is a condition which helps in optimization that solution satisfies.
What are constraints?Constraints are logical conditions that solution to a problem of optimization must satisfy.In defining constraint, value of interest is computed using variables of decision.
There are 5 types of constraints:
1) NOT NULL constraints- They prevent null values to be entered.
2) unique constraints-ensures that each value is different from others and is not null.
3) Check constraints-It is a database rule specifying values in one or more columns.
4) foreign key constraints- It gives definition of required relationships between and within tables.
5) informative constraints-It is a constraint which is used by the SQL compiler for improving access to the data.
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Many familiar substances have common, unsystematic names. For each of the following, give the correct systematic name:
(a) saltpeter, KNO3;
(b) soda ash, Na2CO3;
(c) lime, CaO;
(d) muriatic acid, HCl;
(e) Epsom salts, MgSO4;
(f) milk of magnesia, Mg(OH)2
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
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.
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! :)
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
Walter buys a bus pass for $30. Every time he rides the bus,
money is deducted from the value of the pass. He rode
12 times and $24 was deducted from the value of the pass.
How much does each bus ride cost?
Answer:
2
Explanation:
$24/12 (times) = $2.00
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
The steps in every scientific investigation must_______________________.
A. follow exactly the same sequence.
B. begin with a hypothesis
C. include the development of a theory.
D. be performed in a logical sequence.
Answer:
B. begin with a hypothesis
Explanation:
why do you have to pay for everthing it should be free for new user for like a week
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:
There are different atoms and each type of atom is called
HELP! 100 points if you give a valid answer and brainliest if it's detailed!
Explanation:
The extract of plant is not done in fixed proportion
it is heterogeneous
