Answer:
the transition from water to steam is call evaporation.
Explanation:
water evaporates or vaporizes and turns into steam this typically happens when heat meets with the water. an example would be if you boil water steam will release from the pot, or when it rains, snows, etc (precipitation) the water evaporates and the ground dries.
Calculate the wavelength of light with an energy of 3.60x10^-19 J *
Explanation:
from E = mc^2 and de Broglie wavelength=h/mc
combine the eqns with respect to m(considering the body is moving with the speed of light(c))
then
E= hc/de Broglie wavelength
since, c= 3× 10^ 8
h= 6.626 × 10^ -34 and E is given, substitute the values.
sorry I don't have my calculator.
A student was asked to determine the percentage of each component in a mixture of silver nitrate, AgNO3 and magnesium hydroxide, Mg(OH)2. The mass of the sample used was 3.54 g. The student extracted AgNO3 from the mixture with water and separated the insoluble Mg(OH)2 from the solution by filtration. After evaporating the filtrate to dryness, the student recovered and dried the AgNO3, and found that it weighed 1.15 g. After drying the recovered Mg(OH)2, a mass of 2.25 g was recorded. On the basis of the mass of the sample used:
1. Calculate the % AgNO3 in the mixture,
2, Calculate the % Mg(OH)2 in the mixture.
3. Calculate the total mass of the AgNO3 and Mg(OH)2 recovered.
4. Calculate the % recovery of the components, using the total mass of the substances recovered.
5. Calculate the % error for the separation of the components of the mixture.
Answer:
1
[tex]k = 32.5 \% [/tex]
2
[tex]z =63.56 \%[/tex]
3
[tex]m_t = 3.40 \ g[/tex]
4
[tex]j = 96.05 \%[/tex]
5
[tex]e = 3.954 \%[/tex]
Explanation:
From the question we are told that
The mass of the sample is [tex]m = 3.54 \ g[/tex]
The mass of the AgNO3 is [tex]m_s = 1.15 g[/tex]
The mass of Mg(OH)2 is [tex] m_n= 2.25 g[/tex]
Generally the percentage of AgNO3 in the mixture is
[tex]k = \frac{1.15}{3.54} * 100[/tex]
=> [tex]k = 32.5 \% [/tex]
Generally the percentage of Mg(OH)2 in the mixture is
[tex]z = \frac{m_n}{m} * 100[/tex]
=> [tex]z = \frac{2.25}{3.54} * 100[/tex]
=> [tex]z =63.56 \%[/tex]
Generally the total mass of the AgNO3 and Mg(OH)2 recovered is
[tex][tex]m_t = m_s +m_n[/tex]
=> [tex]m_t = 1.15 +2.25[/tex]
=> [tex]m_t = 3.40 \ g[/tex]
Generally the percentage recovery of the components is mathematically represented as
[tex]j = \frac{m_t}{m} * 100[/tex]
=> [tex]j = \frac{3.40}{3.54} * 100[/tex]
=> [tex]j = 96.05 \%[/tex]
Generally the percentage error for the separation of the components of the mixture is mathematically represented as
[tex]e = \frac{m- m_t}{m} * 100[/tex]
=> [tex]e = \frac{3.54 - 3.40}{3.54} * 100[/tex]
=> [tex]e = 3.954 \%[/tex]
What is most often the next step if scientific evidence is established that does not support an accepted theory?
Answer:
A scientific theory is an explanation of an aspect of the natural world that can be repeatedly tested and verified in accordance with the scientific method, using accepted protocols of observation, measurement, and evaluation of results. Where possible, theories are tested under controlled conditions in an experiment.
Explanation:
What kind of charge do electrons have
Answer:
An electron has a Negative charge or -1
The length is 3 meters, the width is 9 meters, and the height is 2 meters. What is the
volume?
5.
The length is 10 meters, the width is 4 meters, and the height is 7 meters. What is the
volume?
Answer:
3 x 9 x 2 = 54 meters
10 x 4 x 7 = 280 meters
Explanation:
Multiply the length, the width, and the height.
You can multiply them in any order to get the same different result. The formula for finding the volume of a rectangular prism is the following: Volume = Length * Height * Width, or V = L * H * W.
Answer:35 cubes with a length of 7 meters, height of 1 meter, and width of 5 meters.
What is the length of the figure?
✔ 7 m
What is the width?
✔ 5 m
What is the height?
✔ 1 m
What is the number of cubes?
✔ 35 cubes
What is the volume?
✔ 35 cubic meters
Explanation:
8. What is the density of a rock with a volume of 5 cubic centimeters and a mass of 3 grams?
Answer:
The answer is 0.6 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question
mass = 3 g
volume = 5 cm³
We have
[tex]density = \frac{3}{5} \\ [/tex]
We have the final answer as
0.6 g/cm³Hope this helps you
Consider the following isotopic abundance data for argon (Ar) and silicon (Si):
Argon Isotope Isotopic Molar Mass 36 Ar 35.96755 g/mol Ar 37.96272 g/mol 40 Ar 39.96240 g/mol Abundance 0.337% 0.063% 99.600% Silicon Isotope Isotopic Molar Mass 25 Si 27.97693 g/mol 29 Si 28.97649 g/mol 30 Si 29.97376 g/mol Abundance 92.23% 4.67% 3.10%
Use the data to calculate the atomic masses of naturally occurring argon and silicon.
b) Calculate the number of atoms in 78.2 g of naturally occuring Si.
c) 42Ar is one of the longest lived radioactive isotopes of Argon. Mass spectroscopy data yields the following ratio of the mass of 42Ar to 40Ar: Mass of 42Ar Mass of 40Ar = 1.05006 use this ratio to find the atomic mass of 42Ar.
2. Pantoprazole, first sold under the brand name Protonix, is used for short-term treatment of erosive esophagitis associated with gastroesophageal reflux disease (GERD). The chemical formula for pantoprazole is C16H15F2N3O4S a) What is the molar mass of pantoprazole? b) How many molecules are in a 0.078 g sample of panotprazole?
Answer:
Explanation:
Molar mass of Argon
= 35.96755 x .00337 + 37.96272 x .00063 + 39.96240 x .99600
= .12121 + .0239165 + 39.80255
= 39.95
Molar mass of silicon
27.97693 x .9223 + 28.97649 x .0467 + 29.97376 x .0310
= 25.803 + 1.35320 + .929
= 28.08
b )
No of atoms of Si in 78.2 g = 78.2 x 6.02 x 10²³ / 28.08
= 16.76 x 10²³ .
c )
42 Ar / 40 Ar = 1.05006
42 Ar / 39.95 = 1.05006
42Ar = 41.95
2 )
C₁₆H₁₅F₂N₃O₄S
Mol weight = 16 x 12 + 1 x 15 + 2 x 19 + 3 x 14 + 4 x 16 + 32
= 192 + 15 + 38 + 42 + 64+ 32
= 383
No of molecules = .078 x 6.02 x 10²³ / 383
= 1.226 x 10²⁰ molecules .
Answer:
It's too short. Write at least 20 characters to explain it well.
Explanation:
Hold on, our servers are swamped. Wait for your answer to fully load.
Calculate the pressure on the ground if a prson of weight 450N was to
themselves on one heel of a stilleto shoe. one stilletto heel has an area of 1 square
centimetre.
Pls
Answer:
we will calculate the pressure in pascals:
The units of pascal are Newtons / m²
Since we are given the force in newtons but we are given the area in cm² , we will convert 1 cm² to 1 m²
we know that 1 cm² = (1 / 10000) m²
Now, plugging these values in the equation for pressure:
Pressure = Force (N) / Area (m²)
Pressure = 450 / (1 / 10000)
Pressure = 450 * 10,000
Pressure = 4,500,000 pa
Therefore, the stilleto shoe is applying a pressure of 4.5 million pascals on the floor
We can convert it to some other units from this information
This much Pressure will be equal to:
4,500 kPa (Kilo pascals)
4.5 MPa (mega pascals)
Which of the following describes a net force?
It is the total of the combined forces acting on an object.
It is the same thing as gravity.
It is a force that is part of the Internet.
It is the same thing as inertia.
Answer:
Net force is the vector sum of forces acting on a particle or body. ... Its associated torque, the net force, becomes the resultant force and has the same effect on the rotational motion of the object as all actual forces taken together.
CAN SOMEONE PLEASE HELP ME ASAP!! DOES ANYONE KNOW THE ANSWER TO NUMBER 2
Answer:
What is the question? ...
What is an organ? List five (5) examples of organs?
Answer:
Here are all of the organ systems with some examples of organs found in each system:
Integumentary (skin, hair, nails)
Skeletal (bones)
Muscular (smooth, cardiac, and skeletal muscles)
Circulatory (heart, arteries, veins)
Respiratory (lungs, diaphragm, larynx)
Digestive (stomach, intestines, liver)
Explanation:
PLEASE HELP ASAP ESSAY WORTH 15 POINTS! ONLY GENIUS!
(Essay Worth 8 points)
(02.03 MC)
Is mass conserved when 200 g of water undergoes a physical change? Use complete sentences to support your answer by explaining how this can be demonstrated.
Answer:
According to the law of conservation of mass, the mass of reactants will be equal to the mass of the products.
Explanation:
How many oxygen atoms are in 4 Fe(C2H302)3?
Answer:
24
Explanation:
what are the real primary colors
Answer:
red, yellow, blue are the 3 main primary colors
Someone plz hello me ASAP it would be appreciated on question 5 btw
Answer:
Option A kinetic energy
As the bow initially was at rest it had potential energy (an object at rest potential energy) and when it was at motion it will kinetic energy (object at rest will have kinetic energy)
Why is it difficult to hold and keep liquids like water in your hand? Guys please help
Answer:
Molecules move freely around since they don't have a definite shape. This is the reason water stays liquid and couldn't be gripped.
A geochemist in the field takes a 25.0 mL sample of water from a rock pool lined with crystals of a certain mineral compound X. He notes the temperature of the pool, 26.° C, and caps the sample carefully. Back in the lab, the geochemist first dilutes the sample with distilled water to 350. mL. Then he filters it and evaporates all the water under vacuum. Crystals of X are left behind. The researcher washes, dries and weighs the crystals. They weigh 3.00 g.
1) Using only the information above, can you calculate the solubility of X in water at 26 degrees Celsius.?
a. Yes
b. No
2) If yes than calculate the solubility of X. Round your answer to 3 significant digits
Answer:
Explanation:
1 ) The solubility can be calculated .
The sample taken from the pool was a saturated solution of mineral compound X because the pool was lined with the crystals of X .
The sample taken was 25 mL . Though it diluted afterwards , the solute contained in it did not change . The solute X was found to be 3.00 g
2 )
3 .00 g of solute X was contained in 25 mL of saturated solution .
solubility of X = 3 / 25 g per mL
= 3 x 1000 / 25 g per L
= 120 g / L
= 1.20 x 10² g / L
Calculate the percent composition by mass of each element in LiClO2.
Given parameters:
Chemical specie = LiClO₂
Unknown:
Percentage composition of each specie = ?
Solution:
The percentage composition involves knowing the percent of total mass of a compound is made up of each of the constituent elements or groups.
Sum up the atomic masses and find the formula massDetermine percentage composition of each elementFormula mass of LiClO₂;
7 + 35.5 + 2(16) = 74.5g/mol
The percentage composition of each species are;
%Li = [tex]\frac{7}{74.5}[/tex] x 100 = 9.4%
%Cl = [tex]\frac{35.5}{74.5} x 100[/tex] = 47.7%
%O₂ = [tex]\frac{32}{74.5} x 100[/tex] = 43.0%
A sample containing 16.93 metal pellets is poured into a graduated cylinder containing 11.2 of water, causing the water level in the to 19.7 Calculate the density of the metal.
Blank = g/ml
Answer:
The answer is 1.99 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 16.93 g
volume = final volume of water - initial volume of water
volume = 19.7 - 11.2 = 8.5 mL
We have
[tex]density = \frac{16.93}{8.5} \\ = 1.9917647058...[/tex]
We have the final answer as
1.99 g/mLHope this helps you
If an atom has an atomic number of 10 and an atomic mass number of 20, how many protons, neutrons, and electrons does it have?
Zachary adds 26.64 g to 12.557 g. How many significant figures should his answer have?
two
three
four
five
This answer should have four signifigant features
Explanation:
I had this on a test and got it right :D
Answer?????????????????????????????!!?!?!?!,!?!?!?
Answer:
why cant you just say the grasshopper eats the marsh grass the shrew eats the grasshopper and the hawk eats the shrew.
Explanation:
this makes sense to me but im not sure.
Answer:
the hawk eats both the snake and the shrew and so does the snake eat the shrew and frog and ex...
Explanation:
A student dissolves 10,3 g of sodium chloride(NaCl) in 250 g of water in a well-insulated open cup. She then observes the temperature of the water fall from 23.0 °C to 22.2 °C over the course of 3 minutes. Use this data, and any information you need from the ALEKS Data resource,
NaCl (s) rightarrow Na+ (aq) + Cl- (aq)
You can make any reasonable assumptions about the physical properties of the solution. Note for advanced students: it's possible the student did not do the experiment carefully, and the values you calculate may not be the same as the known and published values for this reaction.
1. Is this reaction exothermic, endothermic, or neither?
2. If you said the reaction was exothermic or endothermic, calculate the amount of heat that was released or absorbed by the reaction in this case.
3. Calculate the reaction enthalpy delta Hrxn per mole of NaCl.
Answer:
1
The reaction is exothermic
2
[tex]H = -1.1 \ KJ[/tex]
3
[tex]\Delta H_{rxn} = -6.24 \ KJ/ mol[/tex]
Explanation:
From the question we are told that
The mass of the sodium chloride is (NaCl ) is [tex]m_s = 10.3 \ g[/tex]
The mass of water is [tex]m_w = 250 \ g[/tex]
The initial temperature is [tex]T_i = 23^oC[/tex]
The temperature after 3 minutes is [tex]T_3 = 22.2 ^oC[/tex]
The time taken for temperature to fall is t = 3 minutes
The reaction is
[tex]NaCl_{ (s)} \rightarrow Na^+ _{(aq)} + Cl^-_{ (aq)}[/tex]
The reaction is exothermic because the temperature fell
Generally the mass of the solution is mathematically represented as
[tex]M = m_w + m_s[/tex]
=> [tex]M = 250 + 10.3 [/tex]
=> [tex]M = 260.3 \ g [/tex]
Gnerally the heat energy released from the solution is mathematically represented as
[tex]H = M * C_s * (T_3 - T_i)[/tex]
Here [tex]C_s[/tex] is the specific heat of solution which for this question we would assume it is the specific heat of water which has a value of
[tex]Cs = C_w = 4.18 J/g^oC[/tex]
So
[tex]H = 260.3 * 4.18 * (22- 23)[/tex]
[tex]H = -1088.054 \ J[/tex]
[tex]H = -1.088054 \ KJ[/tex]
[tex]H = -1.1 \ KJ[/tex]
Generally the number of moles of NaCl is mathematically represented as
[tex]nNaCl = \frac{m_s}{zNaCl}[/tex]
Here [tex]zNaCl[/tex] is the molar mass of NaCl and the value is
[tex]zNaCl = 58.44 \ g/mol[/tex]
So
[tex]nNaCl = \frac{10.3}{58.44 }[/tex]
=> [tex]nNaCl = 0.1762 \ moles[/tex]
Generally reaction enthalpy is mathematically represented as
[tex]\Delta H_{rxn} = \frac{H}{nNaCl}[/tex]
[tex]\Delta H_{rxn} = \frac{-1.1}{0.1762 }[/tex]
[tex]\Delta H_{rxn} = -6.24 \ KJ/ mol[/tex]
what is the major source of energy for the production of electricity in this facility
Is this name iron oxide written correctly? Why or Why not?
Answer:
If iron, Fe, and oxygen, O2, are in contact at high enough temperatures (and with plenty of oxygen around), the grey or reddish compound that forms is called iron(III) oxide with the formula Fe2O3
Explanation:
Iron rusts. We all know that. But the chemical reactions behind rust are surprisingly complicated! We will return to them at the end of the course when we discuss corrosion (see section 11.6 in the text). Here, we focus simply on the main compounds formed between iron and oxygen. That there is more than one may surprise you. That there are not an infinite number of them (and in fact, there almost is, as well shall see!) is an example of the law of definite proportion, an idea so central to chemistry it is almost taken for granted today.
A student performs an experiment where gas is collected over water in an upside down graduated cylinder. If the atmospheric pressure is 745 mmHg and the level of water in the graduated cylinder is 14.4 cm higher than the level of the water exposed to the atmosphere, what is the total pressure of gases inside the graduated cylinder? Enter your answer numerically in units of mmHg.
Answer:
601mmhg
Explanation:
Pgas = Patm - hρg
Height of water = 14.4cm
Convert to mm
1 cm = 10mm
14.4 cm =
= 14.4cm × 10mm
= 144mm
hpg = 144 mmhg
Ptotal = Patm - hog
= 745mmhg - 144 mmhg
= 601mmhg
The total pressure of gases inside the graduated cylinder = 601mmhg
The possible products of a double displacement reaction in aqueous solution are
(NH4)2S and NaNO3. Which of these possible products will form as a solid in this
reaction?
O A) Neither compound will form as a solid.
B) NaNO3
C) Both compounds will form as a solid.
OD (NH4)2S
Answer:
i believe it to be B. but hope it helps
Explanation:
sorry if im wrong
The possible products will form as a solid in this reaction (NH4)2S. The correct option is D.
What is the double displacement reaction?The double displacement reaction is the reaction in which two reactants create two new compounds by exchanging ions. Precipitates are frequently formed as a byproduct of double displacement processes. One element from the solution and another elements form a precipitate.
According to rules of solubility, the sulfides are usually not soluble in water and sodium nitrate is readily soluble in water, so it is clear that the precipitate is formed by the sulfide group. The solution will be formed by sodium nitrate.
Thus, the correct option is D. (NH4)2S.
To learn more about double displacement reaction, refer to the link:
https://brainly.com/question/13870042
#SPJ5
Write the balanced net ionic equation for the reactions that occur when the given aqueous solutions are mixed. Include the physical states. A. copper(II) sulfate, CuSO4 , and potassium hydroxide, KOH net ionic equation: B. lithium carbonate, Li2CO3 , and aluminum nitrate, Al(NO3)3 net ionic equation: C. sodium phosphate, Na3PO4 , and barium chloride, BaCl2 net ionic equation:
Answer:
1. Cu(2+) [solution] + 2OH(-) [solution]= Cu(OH)↓ [solid]
2. 3CO3(2-) [solution] + 2Al(3+) [solution] + 3H2O [liquid] = 2Al(OH)3↓ [solid] + 3CO2↑ [gas]
2. 2PO4(3-) [solution] + 3Ba(2+) [solution] = Ba3(PO4)2↓ [solid]
As chief chemist at Superior Analytical Products (SAP) you must design an experiment to determine the density of an unknown liquid to three (3) significant figures. The density is of the order of 1 g/cm3. You have approximately 7 mL of the liquid and only graduated cylinders and balances are available for your use. Which of the following combinations of equipment will allow you to meet but not exceed your goal?
a. graduated cylinder with +0.1 mL uncertainty, balance with :0.1g.
b. graduated cylinder with ±001 mL uncertainty: balance with 101 g uncertainty.
c. graduated cylinder with t0.01 mL uncertainty balance with t0 01 g uncertainty.
d. graduated cylinder with ±0 001 mL uncertainty, balance with 10001 g uncertainty.
Answer:
The correct answer is a
Explanation:
The formula for density is mass ÷ volume. Hence, a balance is required to determine the mass while a measuring/graduated cylinder is required to determine the volume.
The ideal measuring cylinder and balance to be used should have an uncertainty of just 0.1 ml and 0.1 g respectively. This reduces the chances of the answer gotten from the formula above to be more than 3 significant figures.
For example, if the volume to be used is 4.0 ml and the mass of this volume is 3.5 g, the density will be
Density = 3.5 ÷ 4
Density = 0.875 g/cm³ or 0.875 g/ml
NOTE that cm³ is the same measurement as mL
The answer above is in 3 significant figures
Which of the following is not an example of temperature abuse ?