Answer:
They conducted it from earth
Explanation:
There had never been anything capable of observing it from space launched at that time because Sputnik wasn't even launched
An aqueous solution of glucose (MM = 180.2 g/mol) has a molality of 2.27 m and a density of 1.20 g/mL. What is the molarity of glucose in the solution?
**Any help would be greatly appreciated!**
Answer:
Molarity of the glucose solution = 2.72 mol/L
Explanation:
Molality of a solution is defined as the number of moles of solute per kilogram of solvent.
Therefore , a 2.27 molal solution of glucose contains 2.27 moles of glucose in 1 Kg of solvent
Density of solution = 1.20 g/mL
The volume occupied by 1 Kg or 1000 g solution = mass/density
Volume of 1000 g solution = 1000 g/1.20 g/ml = 833.3 mL
Number of moles of glucose present in the solution = 2.27 moles
Molarity = number of moles / volume(L)
volume of solution in litres = 883.3/1000 = 0.8333 L
Molarity = 2.27 moles /0.8333 l = 2.72 mol/L
Therefore, molarity of the glucose solution = 2.72 mol/L
The molarity of the glucose in the solution has been 2.72 mol/L.
Molality can be defined as the moles of the solute per kg of solvent.
The molality of glucose solution = 2.27 m
2.27 moles of glucose in 1000 grams of water.
Density has been the mass per unit volume. The density can be expressed as:
Density = [tex]\rm \dfrac{Mass}{Volume}[/tex]
The density of the given glucose solution = 1.20 g/ml
The volume of 1000 grams of water has been:
Volume = [tex]\rm \dfrac{Mass}{Density}[/tex]
Volume of 1000 grams water = [tex]\rm \dfrac{1000\;g}{1.20\;g/ml}[/tex]
Volume of 1000 g water = 833.3 ml
The molarity can be defined as the mass of solute per liter of the solution.
Molarity = [tex]\rm moles\;\times\;\dfrac{1000}{Volume\;(ml)}[/tex] ......(i)
The moles of glucose in the 833.3 ml solution have been 2.27 mol.
Substituting the values in equation (i):
Molarity = 2.27 mol [tex]\rm \times\;\dfrac{1000}{833.3\;ml}[/tex]
Molarity = 2.72 mol/L.
The molarity of the glucose in the solution has been 2.72 mol/L.
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Why does carbon form covalent bonds?
Answer:
Carbon has 4 electrons in its outermost shell. ... Therefore, carbon completes its octet by sharing its 4 electrons with other carbon atoms or with atoms of other elements and forms covalent bond. It forms strong covalent bonds because of its small size.
Explanation:
Which statement accurately describes tectonic plate movement? A)Tectonic plate movement can be prevented with planning. B)Tectonic plate movement does not cause environmental change. C)Tectonic plate movement does not affect organisms. D)Tectonic plate movement is a long-term environmental change.
Answer: I wanna say D because pangea was tectonic plates that moved and reshaped the earth
Explanation:
I hope that helps
Answer
D on edge
Explanation:
5. How many atoms and molecules of sulphur are present in 64.0 g of sulphur (S 8 )?
Answer:
There are [tex]1.202\times 10^{24}[/tex] atoms and [tex]1.502\times 10^{23}[/tex] molecules in the compound.
Explanation:
The molar mass of the sulphur is [tex]32.065\,\frac{g}{mol}[/tex]. The Avogradro's Law states that exists [tex]6.022\times 10^{23}\,\frac{atom}{mol}[/tex]. The quantity of atoms in a quantity of mass is derived from dividing the mass by the molar mass and multiplying it by the Avogadro's Number. That is:
[tex]n_{atom} = m_{S}\cdot \frac{n_{A}}{M_{S}}[/tex]
Where:
[tex]m_{S}[/tex] - Mass of the sample, measured in grams.
[tex]n_{A}[/tex] - Avogadro's Number, measured in atoms per mole.
[tex]M_{S}[/tex] - Molar mass of the sulphur, measured in grams per mole.
If [tex]m_{S} = 64\,g[/tex], [tex]n_{A} = 6.022\times 10^{23}\,\frac{atoms}{mol}[/tex] and [tex]M_{S} = 32.065\,\frac{g}{mol}[/tex], then:
[tex]n_{atom} = (64\,g)\cdot \left(\frac{6.022\times 10^{23}\,\frac{atoms}{mol} }{32.065\,\frac{g}{mol} }\right)[/tex]
[tex]n_{atom} = 1.202\times 10^{24}\,atoms[/tex]
There are [tex]1.202\times 10^{24}[/tex] atoms in the compound.
Now, the molecular weight of the compound is:
[tex]M_{S_{8}} = 8\cdot \left(32.065\,\frac{g}{mol} \right)[/tex]
[tex]M_{S_{8}} = 256.52\,\frac{g}{mol}[/tex]
The quantity of molecules in a quantity of mass is derived from dividing the mass by the molecular weight and multiplying it by the Avogadro's Number. That is:
[tex]n_{molecule} = m_{S_{8}}\cdot \frac{n_{A}}{M_{S_{8}}}[/tex]
Where:
[tex]m_{S_{8}}[/tex] - Mass of the sample, measured in grams.
[tex]n_{A}[/tex] - Avogadro's Number, measured in atoms per mole.
[tex]M_{S_{8}}[/tex] - Molecular weight of the compound (octosulphur), measured in grams per mole.
If [tex]m_{S_{8}} = 64\,g[/tex], [tex]n_{A} = 6.022\times 10^{23}\,\frac{molecules}{mol}[/tex] and [tex]M_{S_{8}} = 256.52\,\frac{g}{mol}[/tex], then:
[tex]n_{molecule} = (64\,g)\cdot \left(\frac{6.022\times 10^{23}\,\frac{molecules}{mol} }{256.52\,\frac{g}{mol} }\right)[/tex]
[tex]n_{molecule} = 1.502\times 10^{23}\,molecules[/tex]
There are [tex]1.502\times 10^{23}[/tex] molecules in the compound.
why is temperature not a chemical change
Answer:
Temperature is not a chemical change because when a substance changes in temperature, its chemical makeup is not changing.
What is chemical potential energy?
Answer:
Chemical potential energy is the energy stored in the chemical bonds of a substance.
Explanation:
skeleton equation for
when magnesium oxide reacts with iron, iron(III) oxide and magnesium is formed
Answer:
Magnesium oxide = MgO
Iron = Fe
Iron (III) Oxide = Fe₂O₃
Magnesium = Mg
Skeleton equation = MgO + Fe ⇒ Fe₂O₃ + Mg
Will knows that the gravitational pull of Mars is less than the gravitational pull of Earth. When he lands on Mars, his mass will be
Answer:
i think it will "Equal to 75 Kg"
Explanation:
object/person remains same, his mass is somewhere, so it would remain same everywhere. Only Weight of a person changes with gravity
hope i helped
-lvr
Valency of Chlorine is 1. Why?
Answer:
Valency of Chlorine is 1 because it needs 1 electron to complete its octet (a shell of eight electrons). Valency is defined as "The combining power of an element" and Since, chlorine needs 1 electron to complete its valence shell, Its valency is 1.
How would you measure the specific latent heat of vaporisation of a liquid?
Answer:
Ramsey and Marshall method.
Explanation:
The specific latent heat of vapourization of a liquid is measured by a modification of the method of Ramsey and Marshall in the year 1896.
why am i blonde.............
Answer:
because your parents carry the recessice gene or they are blond
Explanation:
it could also be ffrom a mutation or just because you dyed your hair
heterogeneous non example
Heterogeneous 'mixtures' (because they don't meet the definition of mixtures) are mixtures substances that aren't completely uniformly spread out. They haven't reacted with the solvent to become a solution.
Explanation: There are 2 types of heterogeneous solutions, A Colloid and a suspension.
Colloid: You can check if a mixture is heterogeneous by passing a light ray through it. This may cause the Tyndall effect (If the mixture is a colloid) when the Colloidal Heterogeneous mixture's particles are so small that they refract the beam of light and the path of light will be visible, like if you add 3 drops of milk in a glass of Water and shine a laser light through it. This is because the particles are too small to be seen by the unaided eye but big enough to scatter you laser light. However that particles won't settle down or will be separated by a filter paper due to particles' small size.
Suspension: A solution will be a solution when the particles of the Mixture is big enough to be seen by the unaided eye. Like if you mix sand and Water, the sand will eventually settle down due to Gravity. The mixture's solute will be big enough to pass through a filter paper.
E ) The distribution coefficient , Ko ( Cether / C water ) , for an organic substance X at room temperature is 13. What relative volume of ether to water should be used for the extraction of 94 percent of X from a water solution in single extraction ?
Answer:
Relative volume of ether to water that should be used for the extraction = 1.205
Explanation:
The extraction/distribution coefficient of an arbitrary solvent to water for a given substance is expressed as the mass concentration of the substance in the arbitrary solvent (C₁) divided by the mass concentration of the substance in water (C₂).
K = (C₁/C₂)
Let the initial mass of the organic substance X in water be 1 g (it could be any mass basically, it is just to select a right basis, since we are basically working with percentages here).
If 94% of the organic substance X is extracted by ether in a single extraction, 0.94 g ends up in ether and 0.06 g of the organic substance X that remains in water.
Let the volume of ether required be x mL.
Let the volume of water required be y mL.
Relative volume of ether to water that should be used for the extraction = (x/y)
Mass concentration of the organic substance X in ether = (0.94/x)
Mass concentration of organic substance X in water = (0.06/y)
The distribution coefficient , Ko (Cether / C water), for an organic substance X at room temperature is 13.
13 = (0.94/x) ÷ (0.06/y)
13 = (0.94/x) × (y/0.06)
13 = (15.667y/x)
(x/y) = (15.667/13) = 1.205
Hope this Helps!!!
The combustion of methane is a reaction commonly used in chemistry problems due to its ability to fit into multiple topics. So it should not surprise you to see it here as well. How many L of CO2 would be produced if 45 g of CH4 was combusted with ample oxygen in a room that was 90 degrees Celsius and under 1 atm of pressure
Answer:
20.76 L OF CO2 WILL BE PRODUCED BY 45 G OF METHANE.
Explanation:
Equation of the reaction:
CH4 + 02 --------> CO2 + 2H20
Molar mass of methane = ( 12+ 1*4) g/mol = 16 g/mol
Calculate the number of moles present in 45 g of methane
1 mole of methane = 16 g / mol of methane
(45 / 16) mole of methane = 45 g of methane
= 2.8125 moles
Using the ideal gas equation:
PV = nRT
P = 1 atm
n = 2.812 moles
T = 90 C
R = 0.082 L atm/ mol C
V = unknown
So we have:
V = nRT / P
V = 2.8125 * 0.082 * 90 / 1
V = 20.756 L
In the production of CO2 by 45 g of methane, 20.756 L of methane was used.
Then, the volume of CO2 produced by this volume will be 20.756 L since 1 mole of methane produces 1 mole of CO2.
In other words;
1 mole of CH4 = 1 mole of CO2
22.4 dm3 of CH4 = 22.4 dm3 of CO2
20.76 DM3 = 20.76 dm3
The volume of CO2 produced will therefore be 20.76 L
For question numbers 1 and 2, two statements are given - one labelled
Answer to these questions from the codes (i), (ii), (ub and (iv) as given
Both (A) and (R) are true and (R) is correct explanation of the
assertion (A).
(ii)
Both (A) and (R) are true, but (R) is not the correct explanation of
the assertion (A).
(iii)
(A) is true, but (R) is false.
(iv) (A) is false, but (R) is true.
Assertion (A) : Carbon has a strong tendency to either lose or gain
electrons to attain noble gas configuration.
Reason (R):
Carbon has four electrons in its outermost shell and has
the tendency to share electrons with carbon or other
elements.
Assertion (A) and the other labelled Reason (R). Select the correct
Answer:
(iv) (A) is false, but (R) is true.
Explanation:
It is not true that carbon has a strong tendency to either lose or gain electrons to attain noble gas configuration. Carbon is a member of group 14, it is the first member of the group and carbon is purely a non metal. Only metals metals can loose electrons to attain the noble gas configuration. Moreover, carbon does not participate in ionic bonding so it does not gain electrons to attain the noble gas configuration.
However, carbon participates in covalent bonding where it is covalently bonded to four other chemical species using its four outermost electrons. Carbon forms covalent bonds in which four electrons are shared with other chemical species.
What molecule can form hydrogen bonds with others like it A. CF4 B. HCL C. CO2 D. NH3
Answer:
D. NH3
Explanation:
Hydrogen bonding exists only between hydrogen atoms, and is one of the strongest intramolecular forces. So you eliminate your choices down to B and D. HCl can't form Hydrogen bonding because of electron density and electronegativity but NH3 can, so your answer would be D.
Polarity of water. Which is the correct answer?
According to the law of conservation of energy, what will most likely happen in a closed system?
O Energy will be exchanged along with matter.
Energy will be exchanged, but matter will not be exchanged.
Energy will be created along with matter.
Energy will be destroyed, but matter will not be destroyed.
Answer:
the answer is Energy will be exchanged, but matter will not be exchanged.
this because that in a closed system energy is able to be transfered but matter cant.
hope this helps
Answer:
b
Explanation:
none
If a sample of Fe2S3 contains 1.25x10ˣ15 iron atoms what is the mass in grams?
Answer:
mass = 0.00000043189g
In Act V, scene ii of Romeo and Juliet, what role does Friar John play in the catastrophe?
He creates a quarantine, which impacts Romeo.
He secretly performs Romeo and Juliet's wedding.
He mistakenly tells Balthasar that Juliet is dead.
He fails to deliver an important letter to Romeo.
Answer:
I believe its the 4th one. He goes to give Romeo the message but before he is able to, Balthasar tells Romeo that Juliet is dead. Friar John just wasn't there in time.
Answer:
D) he fails to give Romeo an important letter
Explanation:
i took the test. edge 2020
The image is of the formation of a fault-block mountain.
Which of these most likely occurs to result in the
formation of these mountains?
O The crust is compressed
O The crust does not spread apart
The center block is forced upward.
The hanging walls from the two parallel faults slip down
Answer:
d.
Explanation:
The Formation of these mountains will be caused by
The crust does not spread apartThe center block is forced upward.The hanging walls from the two parallel faults slip downOptions B, C, and D is correct.
What are mountains?Generally, a mountain is simply defined as a body that rises dramatically above its surroundings and is distinguished by steep slopes.
In conclusion, Mountains are formed from the formation of rocks over years in an Environment.
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Using the balanced equation below, how many grams of iron(iii) oxide would be required to make 187g iron Fe2O3+3CO = 2Fe+3CO2
Answer:
267.14 iron oxide.
Explanation:
Given that
[tex]Fe_2O_3+3CO = 2Fe+3CO_2[/tex]
We know that molecular mass of iron-oxide = 160 g/mole.
We know that molecular mass of iron = 56 g/mole.
From the above reaction we can say that
1 mole of iron -oxide produce 2 mole of iron
160 gm of iron oxide produce 112 gm of iron
So
1 gm of iron required [tex]\dfrac{160}{112}=1.42 gm[/tex] of iron oxide
Therefore
187 gm of iron required [tex]1.42\times = 187 = 267.14\ gm[/tex] of iron oxide.
Therefore 187 gm of iron required 267.14 iron oxide.
Answer: 267.14
Explanation:
What is the best definition of chemistry?
A. The study of mass, energy, and light
B. The study of life and energy
C. The study of experiments and theories
D. The study of matter, its properties, and its reactions
Which is a negative effect of deforestation on the environment? habitat restoration, desertification, soil production, or urbanization
Answer:
The correct option is desertification
Explanation:
Deforestation is the deliberate act of pulling down trees to provide a clear land for space or to make use of the trees for other purposes such as grazing, farming, timber fire wood, building and constructions, urban utilization, access roads, expansion, development of infrastructures, grazing of cattle and mining
The effects of deforestation includes climate change, flooding, increase in the proportion of green house gases in the atmosphere, soil erosion and desertification.
A negative effect of deforestation is desertification.
Deforestation refers to the cutting down of trees. There are many reasons why people may cut down trees. One of the popular reasons why people cut down trees is to obtain timber which is used for construction and as fuel.
An important consequence of the felling of trees also called deforestation is that a once fertile land may gradually be turned into a desert area. This is known as desertification.
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Hydrogen + Nitrogen
Ammonia
Answer:
Ammonia, NH3, is a chemical compound composed of one nitrogen atom and three hydrogen atoms.
Explanation:
i hope this will help you :)
Answer:
3H2 + N2 ---> 2NH3
Explanation:
3H2 + N2 ---> 2NH3
Hydrogen + Nitrogen Ammonia
what is the name of this compound??
Canthomythisphere
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Fredo’s spaceship takes him to the very edge of known space. There, gravity has no effect at all. Fredo takes a baseball and tosses it into space. What will most likely happen to the ball? It will not move at all. It will return to Fredo’s spaceship. It will eventually stop moving. It will continue moving in a straight line.
Answer:
D. It will continue moving in a straight line.
Explanation:
When Fredo takes a ball and tosses it into space, the ball will move upward infinitely.
Gravity is the downward force that acts on an object.
Without gravity, or without the effect of gravity, an object will continue to move in its path with the original direction applied to it.
Answer:
D
Explanation:
I took the test
1 Cup of Boiling Water
WAPHS Swimming Pool
(100 °C)
or
(25 °C)
• What is the difference between thermal energy and
temperature?
aterials
Enosh
Odates
ades
stery
endance
mbers
• The boiling water has a much higher temperature... What
does that mean?
nferences
enuity Ele
enuity se
sela
• Which has more thermal energy? Why?
Note Cla
Learnir
9
1 Mop
Answer:
Side photo
A small still is separating propane and butane at 135 °C, and initially contains 10 kg moles of a mixture whose composition is x = 0.3 (x = mole fraction butane). Additional mixture (x = 0.3) is fed at the rate of 5 kg mole/hr. The total volume of the liquid in the still is constant, and the concentration of the vapor from the still (xp) is related to x, as follows: Xp = How long will it take for X, to change from 0.3 to 0.35.
Answer: A swimming pool at 40°C is at a lower temperature than a cup of tea at 90°C. However, the swimming pool contains a lot more water. Therefore, the pool has more thermal energy than the cup of tea even though the tea is hotter than the water in the pool.
Explanation: Heat and Temperature do not mean the same thing. ... A swimming pool at 40°C is at a lower temperature than a cup of tea at 90°C. However, the swimming pool contains a lot more water. Therefore, the pool has more thermal energy than the cup of tea even though the tea is hotter than the water in the pool.
Which example is a long-term environmental change? La Niña El Niño climate change small asteroid impact
The correct answer is C. Climate change
Explanation:
Long-term environmental changes occur as major events affect the environment and ecosystems indefinitely. These events differ from short-term environmental changes because the effect of short-term environmental changes is mainly temporary. Also, long-term changes are usually gradual.
Climate change is an example of long-term environmental changes because this implies indefinite and major changes in weather patterns and ecosystems. For example, it is believed climate change will decrease the amount of ice in Earth, change sea level, and lead to the extinction of dozens of species. This does not occur with events such as el niño or a small asteroid impact that affect the environment for a short time and do not imply major changes.
Answer:
it is c) climate change
Explanation:
i just took the quiz
hope this helps!!! :D
The quantum numbers of six electrons are given bellow .Arrange them in order to increasing energies. (a) n= 4,l =2, m= -2, s= -1/2 (b) n=3, l=2, m=1, s=+1/2 © n=4, l=1, m = 0, s=+1/2 (d) n=3, l=2, m= -2, s= -1/2 (e) n=3,l=1, m = -1, s =+1/2 (f) n=4, l=1, m=0, s = +1/2
Answer:
e< d< b< c=f< a
Explanation:
Quantum numbers refers to values that exactly describe the energy of electrons within an atom or a molecule. Electrons are known to possess a set of four quantum numbers used in describing the energy state of such electron. These quantum numbers are solutions to the Schrödinger wave equation for the hydrogen atom.
In describing any electron within the atom, the relevant set of four quantum numbers are: principal quantum number (n), orbital, azimuthal, subsidiary or angular momentum quantum number (l), magnetic quantum number (ml), and spin quantum number (ms).
In the arrangement above, the electrons are arranged in order of increasing energy. Each arrangement of quantum numbers corresponds to a particular energy state of the electron.