Answer:
1.285 x 10²³ molecules CH₄
Explanation:
To find the amount of molecules in the sample, you need to (1) convert grams to moles (using the molar mass of CH₄) and then (2) convert moles to molecules (using Avogadro's Number). It is important to arrange the ratios/conversions in a way that allows for the cancellation of units (the desired unit should be in the numerator). The final answer should have 4 sig figs like the given value (3.423 = 4 sig figs).
Atomic Mass (C): 12.011 g/mol
Atomic Mass (H): 1.008 g/mol
Molar Mass (CH₄): 12.011 g/mol + 4(1.008 g/mol)
Molar Mass (CH₄): 16.043 g/mol
Avogadro's Number:
6.022 x 10²³ molecules = 1 mole
3.423 g CH₄ 1 mole 6.022 x 10²³ molecules
----------------------- x ------------------- x ------------------------------------------- =
16.043 g 1 mole
= 1.285 x 10²³ molecules CH₄
Please HELP!!!!! 100% giving brainliest!!!! I'm givining 100 points too!!!!!!!!
To aid building the skill of observation, examine an unlighted candle. Make a list of as many detailed observations of it as you can. It might help you to pretend you are describing it to a visitor who has never before seen or heard of a candle. Now, carefully light the candle and describe further as many additional observations as you can. Assume that such words as "wick," "candle," "flame," and "burning" will not be understood without detailed description and explanation. Number each observation for reference.
Answer:
The wax vapor starts to burn and creates the stable candle flame that you see. When you blew out the candle you should have seen white smoke rising up into the air from the wick. This is the wax vapor, which becomes visible as it condenses into small liquid droplets in the cooler air.
Explanation:
hope it helps
Answer:
This would be my answer and I hope this helps you.
observe that the flame is not touching the solid candle or the melted wax. It appears to be only touching the wick. I ask them if they think that the candle would burn as long if it were only the wick that was burning. What is the purpose of the wax? When the students place the first flame into the smoke of the second candle, they should see the second candle relight. It is not necessary to touch the wick in order for it to relight. This should lead them to conclude that it is the wax vapor that is burning.
When the students place the beaker containing the ice water above the candle, they should see condensation on the bottom of the beaker. If they hold it too close, they will not see the condensation and will see soot form. Students will usually recognize that the condensation is made of water, but they have difficulty recognizing that it comes from the combustion of the candle.
When the Erlenmeyer flask is placed over the top of the candle in the water, student should observe that the water candle goes out and the water rises. The students test the gas that was collected with phenol red solution (an acid-base indicator). They should observe that the solution changes from red to yellow. I demonstrate that this might indicate the formation of carbon dioxide by blowing through a straw into a solution of phenol red.
Explanation:
Hope this helped you!And thanks for inviting me to be your friend!(:
A music store manager counted the number of people who came into their store on Tuesday and divided them into groups of people younger than 20, 20 to 40, and older than 40. Which type of graph would be the best to use in order to display the data?
The type of graph that will be to display the data collected by the store keeper is bar graph.
What is bar graph?A bar graph can be defined as a chart or a graphical representation of data, quantities or numbers using bars or strips.
Also, a bar graph is a graph that shows complete data with rectangular bars and the heights of bars are proportional to the values that they represent.
Three bar graphs can be used to display the data collected by the store keeper.
First bar graph = people younger than 20Second bar graph = 20 to 40 yearsThird bar graph = people older than 40.Thus, the type of graph that will be to display the data collected by the store keeper is bar graph.
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1- For endothermic reactions AH>0.
For an endothermic reaction, ΔH is positive (>0).
For an exothermic reaction, ΔH is negative (<0).
When the temperature of a system rises as a result of the evolution of heat, an exothermic process takes place. The heat of reaction is reduced as a result of the discharge of this heat into the environment.When the temperature of an isolated system drops while the surroundings of a non-isolated system warm up, this is known as an endothermic response. The heat of reaction is generally positive in endothermic reactions.Enthalpy (ΔH), the total of all potential and kinetic energies, varies as a result of energy level disparities between exothermic and endothermic reactions. In a reaction, the system itself determines ΔH, not the environment.Learn more about thermodynamics here:
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H2S (g) + 2O2 (g) ⇆ H2SO4 (l) Based on the table of values below for the following reaction at 298 K, determine ΔH, ΔS, ΔG, and whether the reaction is thermodynamically favored or not.
If the change in enthalpy is positive then reaction must be endothermic, it means all absorb energy while reaction proceed.
Given,
H2S(g) + 2 O2(g) → H2SO4 (l) ΔH = –235.5 kJ Equation (1)
H2S(g) + 2 O2(g) → SO3(g) + H2O(l) ΔH = –207 kJ Equation (2)
H2O(l) → H2O(g) ΔH = 44 kJ Equation (3)
From above given reaction,
Reverse the equation (1) reaction
H2SO4 (l) → H2S(g) + 2 O2 (g) ΔH = 235.5 kJ Equation (4)
Adding all equations (2), (3), and (4):
To get overall reaction is:
H2SO4 (l) → SO3 (g) + H2O (g)
Overall ΔH value is:
ΔH = 235.5 kJ - 207 kJ + 44 kJ
ΔH = 72.5 kJ
Overall change in enthalpy is +72.5 kJ.
The reaction is thermodynamically favored
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A piece of copper alloy with a mass of 73.0 g is
heated from 26.0◦C to 50.0◦C. In the process,
it absorbs 596 J of energy as heat. What is
the specific heat of this copper alloy?
Answer in units of J/g · K.
Answer:
c≈0.3418 [J/(gr*K)].
Explanation:
1) formula of heat:
Q=cm(T-t), where Q- energy of heat, c - required specifie heat, m - mass, T and t - initial and final temperatures;
2) according to the formula above:
[tex]c=\frac{Q}{m(T-t)};\\ c=\frac{596}{73*(50-26)}=0.34018264840182648401826484018265[\frac{J}{g*K}].[/tex]
P.S. the differrence in °C is equal the difference in °K.
A 39.2 g sample of copper took
up the 4.4 cm3 of space.
What is the density of the
copper piece in g/cm3?
[?] g/cm³
the tonths placo
The Density of copper sample is 8.9 g/cm³ to the nearest tenth.
What is density?Density is the ratio of the mass of a substance and the volume occupied by that substance.
Density measures how tightly-packed the particles in a substance are.
The more tightly-packed the particles are, the denser the substance will be.
The formula for calculating the density of a substance is given below as:
Density = mass/volumeDense substances have smaller volumes but greater masses.
The mass of the copper sample = 39.2 g
The volume of the copper sample = 4.4 cm³
Hence, the density of the copper sample will be:
Density of copper sample = 39.2 g/4.4 cm³
Density of copper sample =8.9 g/cm³
In conclusion, density is a ratio of mass and volume.
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Luke 1:15-17
Biblical Character & Mission/Accomplishment
Answer:
Luke 1:15-17
New International Version
15 for he will be great in the sight of the Lord. He is never to take wine or other fermented drink,(A) and he will be filled with the Holy Spirit(B) even before he is born.(C) 16 He will bring back many of the people of Israel to the Lord their God. 17 And he will go on before the Lord,(D) in the spirit and power of Elijah,(E) to turn the hearts of the parents to their children(F) and the disobedient to the wisdom of the righteous—to make ready a people prepared for the Lord.”(G)
In the Millikan oil drop experiment the measured charge of any single droplet was always a whole number multiple of -1.60 x 10-19 C. If a single droplet was found to have a total charge of -1.12×10-18 C then how many excess electrons are contained within the drop?
The number of excess electrons contained within the drop of Millikan oil drop experiment is determined as 7 excess electrons.
What are the excess electrons contained within the drop?
The excess electrons contained within the drop of Millikan oil drop experiment is calculated as follows;
-1.60 x 10⁻¹⁹ C = 1 electron
-1.12×10⁻¹⁸ C = ? electrons
= ( -1.12×10⁻¹⁸ C) / (-1.60 x 10⁻¹⁹ C )
= 7 excess electrons
Thus, the number of excess electrons contained within the drop of Millikan oil drop experiment is determined as 7 excess electrons.
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The enthalpy of vaporization for methanol is 35.2 kJ/mol. Methanol has a vapor pressure of 1 atm at 64.7 oC. Using the Clausius-Clapeyron equation, what is the vapor pressure for methanol at 34.1 oC? Give your answer in atmospheres, to the third decimal point.
The vapor pressure is obtained as 3.7 atm.
What is the Clausius-Clapeyron equation?The Clausius-Clapeyron equation is the equation that we could use to obtain the vapor pressure of a solution at any temperature. Of course we would always have two different temperatures to work with.
Hence;
ln(P1/P2) = ΔHvap/R (1/T2 - 1/T1)
P1 = initial pressure
P2 = final pressure
ΔHvap = enthalpy of vaporization
T2 = final temperature
T1 = initial temperature
ln(1/P2) = 35.2 * 10^3/8.314 (1/338 - 1/307)
ln(1/P2) = 4234(0.00295 - 0.00326)
ln(1/P2) = -1.31
1/P2 = e^-1.31
P2 = 1/e^-1.31
P2 = 3.7 atm
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Why do some layers of the Sun move faster than others?(1 point) The Sun is a young star. The Sun is a young star. The Sun is expanding and contracting. The Sun is expanding and contracting. The Sun is steadily heating up. The Sun is steadily heating up. The Sun is made of gas.
.) 240. Grams of hot metal at 150 °C was dropped into a beaker containing 150 grams of water at 210 C. The final temperature of the mixture was found to be 27 °C. What is the specific heat capacity of the metal?
The specific heat capacity of the given metal is 0.1234 J/g°C.
The specific heat capacity of a metal is the electricity required to elevate one kilogram (kg) of the cloth by one diploma Celsius (°C).
The specific heat capacity of a substance is the heating ability of a pattern of the substance divided by means of the mass of the pattern, also every so often called massic heat ability. precise warmth capability is a measure of the amount of heat power required to change the temperature of 1 kg of a material by 1 k.
q = m x C x DT
q = m x C x ( T f - T i )
q = amount of heat energy gained or lost by a substance
m = mass of the sample
C = heat capacity ( J oC⁻¹g⁻¹ or J K⁻¹ g⁻¹ )
T f = final temperature
T i = initial temperature
-q metal = q water
-(mCΔT) = mCΔT
-( mC (T f-T i ) = mC( T f-T i )
- (240 g x C x (27°C-150°C) = 150g(4.18J/g°C ) × ( 27°C-21°C )
- ( 240g × C × -127 °C = 150 × 4.18 × 6°C
C = 150 × 4.18 × 6°C / 240g × -127 °
C = 3762 / 30480
C = 0.1234 J/g°C
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Calculate the mass, in grams, of 932 atoms of cesium, Cs. (molar mass of Cs is 132.91 g)
The mass, in grams, of 932 atoms of cesium, Cs is 2.06×10⁻¹⁹ grams
Avogadro's hypothesis6.02×10²³ atoms = 1 mole of cesium
But
1 mole cesium = 132.91 g
Thus, we can say that:
6.02×10²³ atoms = 132.91 g of cesium
How to determine the mass of cesiumThe mass of cesium that contains 932 atoms can be obtained as illustrated below:
6.02×10²³ atoms = 132.91 g of cesium
Therefore,
932 atoms = (932 atoms × 132.91 g) / 6.02×10²³ atoms
932 atoms = 2.06×10⁻¹⁹ g of cesium
Thus, the mass of cesium that contains 932 atoms is 2.06×10⁻¹⁹ grams
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True or False: When you divide for density, you can put mass first or volume
first - the order doesn’t matter.
a. True b. False
Answer:
false
Explanation:
Mateo was the first responder at a crime scene. He ensured that the scene was safe. Other officers arrived. What should Mateo and the officers do next?
A.
They must secure the crime scene.
B.
Nothing; they need to wait for others to arrive.
C.
They should take photos from all angles.
D.
They are required to collect evidence.
Mateo and the officers should secure the crime scene.
What are the stages in crime investigation? Approach the crime scene and seal it-The extent to which crime scene is to be protected is determined. Get information regarding crime surroundings-Valuable information regarding the crime scene's surroundings is obtained.Collect physical evidences-Physical evidences on the spot of crime scene are collected.Prepare a narration mentioning the crime scene's description- A narration is prepared regarding crime scene's location and surroundings.Prepare a sketch of the crime scene-A sketch of the crime scene is prepared keeping in mind the detailed view of the surroundings.Conduct a detailed research-A detailed research is carried out by the detectives regarding the crime scene.Evaluate physical evidences-The physical evidences which are collected are evaluated to obtain information which helps in getting the criminal arrested.Conduct final survey- A final survey is carried out to make sure that no clues which are in regard to the crime are left unattended.Release crime scene- The crime scene is released by removing all the boundaries which were set to protect the crime scene.
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Which is the best argument for why CO2 represents a covalent bond?
A:The difference in electronegativity of the two elements is greater than 1.7.
B:The difference in electronegativity of the two elements is less than 1.7.
C:The difference in electronegativity of the two elements is greater than 1.7 but less than 3.0.
D:The difference in electronegativity of the two elements is zero.
The difference in electronegativity of the two elements is less than 1.7 represents the covalent bond.
What is the covalent bond?
If the electronegative difference is greater than 1.7, the bond's nature is ionic; if it is less than 1.7, the bond's nature is covalent.
The sharing of electrons between atoms is known as covalent bonding. This kind of bonding happens when two atoms of the same or closely related elements in the periodic table come together.
Covalent bonding is seen in between nonmetals and metals, this bonding typically happens between nonmetals. Covalent bonds are most likely to form when two atoms have comparable electronegativities, or the same affinity for electrons.
Therefore, The difference in electronegativity of the two elements is less than 1.7 represents the covalent bond.
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How many atoms of different elements are found in the formulae of the compounds of copper nitrate Cu(No3)2
Neutron stars are composed of solid nuclear matter, primarily neutrons. Assume the radius of a neutron is approximately 1.0 * 10-13 cm. Calculate the density of a neutron. Assuming that a neutron star has the same density as a neutron, calculate the mass (in kg) of a small piece of a neutron star the size of a spherical pebble with a radius of 0.10 mm.
Density of neutron is 3.9868×10¹⁷kg/m³
Here given data is radius of a neutron=1.0×10⁻¹³ we have to calculate density of neutron=?
Density=mass/volume
For calculations of density of neutron volume is not given here so volume of sphere is 4/3πr³
So ,neutron stars are composed of solid nuclear matter, primarily neutrons
Vₙ=4/3πr³
= 4/3π(1.0×10⁻¹³ × 10⁻²)³
= 4/3π((1.0×10⁻¹⁵)³
= 4.1888×10⁻⁴⁵m³ this is the volume of neutron
Neutron stars are composed of solid nuclear matter, primarily neutrons.
Assuming that a neutron star has the same density as a neutron then,
Density=mass/volume
mass of neutron=1.67×10⁻²⁷
Density=1.67×10⁻²⁷kg/4.1888×10⁻⁴⁵m³
= 3.9868×10¹⁷kg/m³ is the density of neutron
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Question Which type of friction occurs when two objects slide past each other? help me
Answer:
Answer:Even though the two surfaces are sliding past each other, there can still be a frictional force between the surfaces, but this sliding friction we call a kinetic frictional force.
An empty beaker weighs 44.19 g.
When completely filled with water, the beaker and its contents have a total mass of 370.65 g. What volume does the beaker hold? Use =1.00 g/mL as the density of water.
volume: mL
How much would the beaker and its contents weigh if it was completely filled with mercury? The density of mercury is =13.5 g/mL.
total mass:
The volume of beaker is 326.46 mL.
What is the volume of the beaker?
The volume of a substance is the amount of space a given mass of the substance occupies.
Volume is related to mass and density of a substance by the following formula:
Volume = mass/densityThe volume of the beaker is calculated as follows:
Volume of beaker = volume of water
The mass of the empty beaker = 44.19 g.
Mass of the beaker + water when filled completely = 370.65 g
mass of water = 370.65 - 44.19 = 326.46 g
density of water = 1 g/mL
Volume of water = mass/density
Volume of water = 326.46 g/1 g/ml
Volume of water = 326.46 mL
Volume of beaker = 326.46 mL
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Pls help me with my chem
Answer:
the answer is maybe 0.000777
if 35g of CaO and 12 g of H2O react with 3g of CaO remain unreacted what is the mass of calcium hydroxide produced
The mass of calcium hydroxide produced is 42.2g.
A white powder without any smell is calcium hydroxide. It is applied in commercial contexts such sewage treatment, paper manufacturing, building, and food processing. It can be used in dentistry and medicine. In root canal fillings, for instance, calcium hydroxide is frequently used. Slaked lime, often known as calcium hydroxide, is an inorganic substance having the chemical formula Ca(OH)2.
It is created when quicklime is combined or slaked with water and is a colorless crystal or white powder. It goes by a variety of names, including pickled lime, hydrated lime, caustic lime, builders' lime, and slaked lime. Calcium hydroxide, often known as E number E526, is a chemical that is employed in a variety of processes, including the production of food. A saturated solution of calcium hydroxide is known as limewater, often known as milk of lime.
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What could be a third quantum number of a 2p3 electron in phosphorus,
15²2s²2p63s²3p³?
A. m/= -1
OB. m/= 2
OC. m₁= 3
OD. m/= -2
The third quantum number of a 2p[tex]^{3}[/tex] electron in phosphorus is ml= -1.
Quantum numbers are the set of numbers describe the position of electron and energy of electron in an atom.there are four types of quantum numbers.
Electronic configuration of phosphorus is 1s[tex]^{2}[/tex] 2s[tex]^{2}[/tex] 2p[tex]^{6}[/tex] 3s[tex]^{2}[/tex] 3p[tex]^{6}[/tex]
Quantum numbers for 2p[tex]^{3}[/tex]
1) Principal quantum number (n) = 2
2) Azimuthal quantum number (l) = (n-1) = 1
3) magnetic quantum number (ml) = -l to +l = -1 , 0 , +1
form the given option , ml = -1 for n= 2 , l = 1
Thus,The third quantum number of a 2p[tex]^{3}[/tex] electron in phosphorus is m= -1
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Answer: A. m/= -1
Explanation:
HELP ME OUT PLEASE!!!!!!!!
How would you define the period of a pendulum?
O time it takes the pendulum to make one full back-and-forth swing
O time it takes the pendulum to swing forward only
O time it take the pendulum to swing back only
Answer:
time it takes the pendulum to make one full swing back and forth swing
Answer:
Answer:
d)the time it takes for the bob to swing back and forth once
Explanation:
Time period of any object is defined as the time after which it can complete its one round of repetitive motion
So here in the back and forth motion of simple pendulum we know that it will move to and fro about its mean position and the total time to make its to and from motion is known as its time period
so here correct answer would be
d) the time it takes for the bob to swing back and forth once
for simple pendulum the formula of time period is given as
T = 2\pi \sqrt{\frac{L}{g}}T=2πgL
here we know
L = length of pendulum
g = acceleration due to gravity
1) Stoichiometry refers to the calculation of the amounts of————and———— involved
in a chemical reaction.
Mark is looking for information on various types of plants. Typing which words will help him make his search on the Internet easier and faster? A. “plants” B. “plants we know” C. “plants on earth” D. “different types of plants”
The words which will help him make his search for various types of plants on the Internet easier and faster is “different types of plants” and is denoted as option D.
What is Search?This is defined as the process in which something is sought for carefully through the use of different types of techniques so as to make it easier.
In the case of Mark looking for information on various types of plants, the best words to type will make his search on the Internet easier and faster is “different types of plants” as it contains all the necessary keywords which is used by the search engine to bring out the result.
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What quantity in moles of sodium atoms do you have if you have 3.80 × 10²³ atoms of sodium. (The mass of one mole of sodium is 22.99 g.)
The quantity in moles of sodium atoms is 0.631 moles of sodium if you have 3.80 × 10²³ moles of sodium.
What is moles?Moles is defined as a standard scientific unit for measuring large quantities of very small entities such as atoms, molecules and some other specified particles.
It is a very important unit of measurement which chemist use. It can also be defined as the amount of substance that contain exactly 6.022 x 10²³ elementary entities in a given substances.
1 moles = 6.022 x 10²³ atoms
3.80 × 10²³ atoms of sodium will have
3.80 × 10²³ x 1 mole of Na / 6.022 x 10²³ atoms
= 0.631 moles of Na
Thus, quantity in moles of sodium atoms is 0.631 moles of sodium if you have 3.80 × 10²³ moles of sodium.
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A student obtains a total of 357.3. points on four tests - each test worth exactly 100. points. Determine the student’s test average with the correct significant digits.
The student’s test average points for the four test is 89.3 points
What is average score (mean)?The Mean is defined as the arithmetic average. Mathematically, it can be expressed as:
Mean = (Summation of scores) / number of scores
How to determine the student’s test average pointsThe following data were obtained from the question:
Summation of points = 357.3 pointsNumber of test = 4Average =?Average = (Summation of scores) / number of test
Average = 357.3 / 4
Average = 89.3 points
Thus, the student’s test average points for the four test is 89.3 points
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A golf ball and a ping pong ball might be about the same size and shape. Which measurement would be similar?
(A) volume
(B) density
(C)mass
(D) weight
Answer:
option a
volume
Explanation:
as they differ in mass/weight ,density is not possible
5. Density: A Cylinder with a diameter of 300 mm and a height of 25 cm. The cylinder is made of
lead. What is the mass of the cylinder? (1 Point)
51,043 grams
160.276 grams
427,404 grams
200,351 grams
Define scientific attributes in your own words.