Find the mole fraction of Methanol CH3OH and water in a solution prepared by dissolving 4.5 g of alcohol in 40 g of H2O.
Chromium reacts with bromine to produce chromium(iii) bromide
The balanced chemical equation for the reaction between chromium and bromine to produce chromium(III) bromide is:
2 Cr + 3 Br2 → 2 CrBr3
This equation shows that two chromium atoms react with three molecules of bromine to form two molecules of chromium(III) bromide.
What is a redox reaction?A redox reaction is a type of chemical reaction that involves the transfer of electrons between reactants. The term "redox" comes from the combination of two processes during the reaction: reduction, which involves the gain of electrons by a reactant, and oxidation, which involves the loss of electrons by a reactant.
Why is the above reaction an example of a redox reaction?The reaction is an example of a redox reaction, where reduction and oxidation occur simultaneously. Chromium is oxidized, while bromine is reduced. The reaction also shows the importance of balancing the number of atoms on both sides of the equation to ensure that the law of conservation of mass is satisfied.
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PLease help me find someone who knows the answer and thank you so much I might give you brainliest if it is correct
Answer: because the hot water molecules are moving faster
Explanation: hot water=faster molecules= it spreads faster
How does increasing the temperature change the physical properties of an object?
1. Increasing the temperature causes chemical reactions to occur
2. Increasing the temperature changes the kinetic energy of the particles of a material
3. Increasing the temperature causes changes in electric fields
4. Increasing the temperature causes the material to become a new compound
Increasing the temperature change the physical properties of an object through the following:
Increasing the temperature causes chemical reactions to occur.Increasing the temperature changes the kinetic energy of the particles of a material.Increasing the temperature causes changes in electric fields.What is Temperature?This can be defined as the degree of hotness or coldness of a substance and it influences some physical properties.
The properties affected are listed above which makes options 1,2 and 3 the most appropriate choice.
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In this circuit, energy is transferred from a battery to a circuit wire and then to a light bulb, where some of it leaves the system. Starting from the battery, which series shows the correct order of energy transformations taking place in this circuit?
light and heat
chemical
electrical
put them in order
Answer:
chemical electrical light heat
A type of reaction that gives off energy is called
Answer:
exothermic
Explanation:
in exothermic reactions, more energy is released when the bonds are formed in the products than is used to breake the bonds in the reactants.Complete this example: A 0.67 molal solution was
made by dissolving glucose in water. The boiling
point of pure water is 100.00°C. The boiling point
constant for water is 0.51°C kg/mol.
on
the
Set up the problem.
• 4T2 = (0.51°C•kg/mole)(0.67 m)
of
• What is the 473 value?
vc
• What is the boiling point for the glucose
solution?
УРС
Answer:
A then C
Explanation:
Answer:
a,c
Explanation:
What is the volume of 0.960 moles of sulfur trioxide?
Answer:
76.86g
Explanation:
the molar mass of sulfur trioxide is about 80.06, so 80.06 grams per mol, 0.96*80.06=76.86g
Predict the organic product or products for the reaction shown.
The organic product for the reaction given in the image is:
"Quaternary ammonium hydroxide". This process is referred to as Hofmann's elimination.
What is Hofmann's elimination?
The chemical process of creating tertiary amines and alkenes using the treatment of quaternary ammonium with excess methyl iodide, that is, (CH₃)₂ NH, as well as...
the treatment of the resulting compound with a mixture of heat, silver oxide (that is Ag₂O (aq)), and water is what is referred to as Hoffmann's Elimination process.
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How many grams of Cl are in 515 g CaCl2 ? mass:
The explanation is in the picture
Which statements describe the motion of the object represented by the graph? Select three options.
The object is moving away from the origin.
The object is moving towards the origin.
The object started at the origin.
The object started at 2 meters.
The object is traveling at a constant velocity.
Answer:
The object is moving away from the origin.
Explanation:
Answer:
The object is moving away from the origin
The object started at 2 meters.
The object is traveling at a constant velocity.
Explanation:
The line on the graph is moving in the upward direction which means the farther right on the graph you go the farther up the line is. The line also has a constant slope which indicates that the object is moving at a constant rate. and if you look at x=0 the y=2 so therefor the object started at 2 meters.
Nitrogen (iv) oxide is passed through the combustion tube before copper is heated.Give a reason for this?
to generate steam which act on copper
Calculate the normal concentration of a solution containing 20.8 g in 400 ml.
Answer:
52 g/L
Explanation:
First, 400 mL / 1000 = 0.4 L
20.8 g / 0.4 L = 52 g /L
Mention the direct consequence of the following factors on the chemical behaviour of
transition elements:
1) Transition elements can lose as well as accept electrons and exhibit a variety of oxidation
states.
The transition metals can form a variety of complexes because can lose as well as accept electrons .
What are transition elements?The transition elements are those elements that are foud at the middle part of the periodic table having incompletely filled d orbitals.
These elements have a variable oxidation state. They can loose and accept electrons easily and this is why transition metal elements can form a variety of complexes with different colors and other properties.
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Explain how energy is conserved in combustion reactions.
Answer:
That’s because of the law of conservation of energy, which states that: Energy cannot be created or destroyed.
Explanation:
Energy may change form during a chemical reaction. For example, energy may change from chemical energy to heat energy when gas burns in a furnace. The exact amount of energy remains after the reaction as before.
Explain ionization suppressants as applied to atomic spectrometry
An ionization suppressor is an alkali metal capable of preventing ionization, which can be used in atomic spectroscopy to determine matter composition.
What is ionization?Ionization refers to the phenomena capable of converting neutral atoms/molecules to electrically charged atoms/ions.
Ionization is a process by which radiation (e.g., alpha, beta, gamma rays) can pass energy to inert matter.
Some examples of ionization suppressors include salts of alkali metals (for example, potassium), which can be used in atomic spectroscopy to determine matter composition.
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Are two atoms of the same element identical?
Answer:
No. They typically are not identical.
Explanation:
Atom's electrons can be in different states
Answer:
NO
Explanation:
Atoms are like dna and cells they all have a different job even if they are the same element
PROBLEM SOLVING: Show pertinent solution and underline/put in a box your final answer. Use the space provided. 15 pts
1. Balance the ff skeleton reactions and identify the oxidizing and reducing agents: 6 pts
a) O2(g) + NO(g) + H2O(l) → NO3-(aq) + H+(aq)
b) CrO42–(aq) + H2O(l) + Cu(s) → Cr(OH)3(s) + Cu(OH)2(s) + OH–(aq)
2. A cell can be prepared from copper and tin. What is the E°cell for the cell that forms from the
following half-reactions? 3 pts
Cu2+(aq) + 2e- Cu(s); E° = 0.34 V Sn4+(aq) + 2e- Sn2+(aq); E° = 0.13 V
Based on the redox equations;
O2 is the oxidizing agent while NO is the reducing agentCu is the reducing agent while CrO_4{^2} is the oxidizing agentThe emf of the cell, E°cell of the cells formed from the half-reactions is 0.21 V
What are reducing and oxidizing agents?Reducing agents are substances which donates electrons and are oxidized in a redox reaction.
Oxidizing agents are substances which accept electrons and are reduced in a redox reaction.
From the given the redox equations:
a) O_2(g) + NO(g) + H_2O(l) → NO_3^{-}(aq) + H^{+}(aq)
O_2 is the oxidizing agent while NO is the reducing agent.b) CrO_4^{2-}(aq) + H_2O(l) + Cu(s) → Cr(OH)_3(s) + Cu(OH)_2(s) + OH^{-}(aq)
Cu is the reducing agent while CrO_4^{2-} is the oxidizing agent.2. The emf of the cell, E°cell = E°red - E°oxi
In the cell, copper is reduced while tin is oxidized.
E°cell = (0.34 - 0.13) V
E°cell = 0.21 V
Therefore, the emf of the cell, E°cell is 0.21 V
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Consider the structure shown.
A central S atom is bonded to three O atoms, two through a single line and one through two lines. There are six dots around two of the O atoms and 4 dots around the third O atom.
Determine the number of shared and unshared electrons in the structure.
shared (bonding) electrons:
unshared (lone, nonbonding) electrons:
Determine the number of shared and unshared pairs of electrons in the structure.
shared (bonding) pairs of electrons:
unshared (lone, nonbonding) pairs of electrons:
Determine the total number of valence electrons in the structure.
total valence electrons:
There are eight lone pairs and four bond pairs of electrons in the SO3 molecule. The valence electrons are found on the valence shell of the molecule.
Lewis structure of SO3The molecule SO3 is represented by the Lewis structure shown in the image attached to this answer. The central atom in the molecule is sulfur.
There are sixteen non bonding electrons in the molecule and eight bonding electrons in the molecule Hence, we have eight lone pairs and four bond pairs of electrons in the molecule as shown in the Lewis structure.
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Use the process of photosynthesis and cellular respiration to describe why the drought has driven the bears into the towns.
The process of photosynthesis and cellular respiration is usually at the barest minimum when drought occurs.
What is Photosynthesis?This is the process in which green plants manufacture their food through the presence of light energy from the Sun.
During drought, there is no water which reduces photosynthetic activity of plants. This leads to shortage of food thereby making bears to come into town in search of food.
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precipitate the reactants in achemical reaction. II. TRUE or FALSE. Write TRUE if the statement is correct and FALSE if it is not.
21. Sugar is very soluble in a nonpolar liquid like mineral oil.
22. Acetone has a higher vapour pressure than ethanol.
23. In a water molecule, the hydrogen is partially positive, while the oxygen is partially negative.
24. The stability of the DNA structure arises from the H-bonding of base pairs.
25. Components of electronic devices include nonpolar substanceslike transient suppression diodes, metalloids and semimetals.
26. Vapour pressure rises as the strength of IMFA decreases.
27. Boiling point, melting point, viscosity ang surface tension increases as the strength of IMFA decreases.
28. lon-dipole interaction exists between ions and a nonpolar compound. 29. Hydrogen bonding occurs with polar molecules bonded with highly- electronegative atoms.
30. Water is a polar molecule, thus it is miscible with nonpolarmolecule like oil.
Answer:
FalseTrueTrueFalseFalseTrueFalseTrueTrueTrueExplanation:
Sucrose is a polar carbohydrate. The negative and positive regions on the polar sucrose molecules are attracted by the polar water molecules, causing sucrose to dissolve in water. A polar substance like sucrose cannot be dissolved by a nonpolar substance like mineral oil.Because hydrogen bonding gives ethanol a stronger intermolecular force than acetone, ethanol has a higher boiling point than acetone. Because vapor pressure is proportional to boiling point in an indirect manner, acetone has a higher vapor pressure at 25° than ethanol.The Ostart text, O, end text atom hogs electrons and keeps them away from the Hstart text, H, end text atoms because oxygen is more electronegative (electron-hungry). This results in a partial negative charge on the oxygen end of the water molecule and a partial positive charge on the hydrogen end.The stability of DNA double-helical structures is aided by aromatic stacking and hydrogen bonding between nucleobases, which are two of the most important interactions. Hydrogen bonds are noncovalent interactions that are weak, yet the enormous number of hydrogen bonds between complementary base pairs in a DNA double helix combine to endow the structure with a lot of stability.'Boron, silicon, germanium, arsenic, antimony, and tellurium are metalloids. These elements resemble metals but do not conduct electricity as effectively as metals, making them semiconductors.The strength of a liquid's intermolecular forces determines its vapor pressure. The vapor pressure of a liquid with weak intermolecular interactions is higher. The vapor pressure of a liquid with higher intermolecular interactions is lower than that of a liquid with less intermolecular forces.The stronger the IMFs, the lower the vapor pressure of the substance and the higher the boiling point.When an ion interacts with a non-polar molecule, it causes an ion-induced dipole force. The charge of the ion produces a distortion of the electron cloud in the non-polar molecule, generating a brief partial charge, similar to a dipole-induced dipole force.water is a polar solvent and it will dissolve salts and other polar molecules, but not non-polar molecules like oil.What information does Gibbs free energy give about a reaction?
A. It tells how quickly the reaction will proceed to equilibrium.
B. It tells if the reaction will proceed spontaneously or not.
C. It tells what the most stable forms of the products are.
D. It tells what the activation energy of the forward reaction is.
Answer: b
Explanation:
Solid Snake is being chased up the communications tower. Solid Snake is 75 kg and is carrying 18 kg of equipment. If Solid Snake climbs 27 flights of stairs, each 5.5 m in height, how much work was done against gravity?
a.
4.04 kJ
b.
109.15 kJ
c.
135.34 kJ
d.
5.01 kJ
Solid Snake (75 kg) carries 18 kg of equipment. If Solid Snake climbs 27 flights of stairs, each 5.5 m in height, the work done against gravity is 135.34 kJ (c).
What is work?In physics, work is the energy transferred to or from an object via the application of force along a displacement.
In this problem, the force that does the work is the one that opposes the weight.
Step 1: Calculate the total weight of the system.Solid Snake is 75 kg and is carrying 18 kg of equipment. The total mass is:
m = 75 kg + 18 kg = 93 kg
We can calculate the weight using Newton's second law of motion.
F = m . g = 93 kg . 9.8 m/s² = 911.4 N
Step 2: Calculate the total displacement.Solid Snake climbs 27 flights of stairs, each 5.5 m in height.
27 . 5.5 m = 148.5 m
Step 3: Calculate the work done.We will use the definition of work.
w = F . s = (911.4 N) . (148.5 m) . (1 kJ/1000 J) = 135.34 kJ
Solid Snake (75 kg) carries 18 kg of equipment. If Solid Snake climbs 27 flights of stairs, each 5.5 m in height, the work done against gravity is 135.34 kJ (c).
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XeF6
formula mass =
molar mass =
Answer:
Xenon hexafluoride's molar mass is about 245.28 g/mol
Formula mass is about 245.28 u.
Explanation:
So we want to find the formula mass of the XeF6 and there is a special formula for that.
You have to multiply the number of each element in XeF6 by the element's atomic mass.
The atomic mass of Xe is 131.293, and F's atomic mass is multiplied by 6, due to the 6 at the bottom. F's atomic mass is 18.998403, so we multiply the atomic number by 6, which would equal 113.990418. Round if you want, but it would equal mostly the same thing. Add it up to get ≈245.28, which is the same thing.
Therefore the formula mass of XeF6 is 245.28 u.
I need help with Discussion of chemical reaction of experiment Asp please!!
Answer:
may I help?............
Calculating Moles of Particles
QUICK CHECK
How many moles of particles are formed by dissolving one mole of each of the following in water?
Ethanol
CaCl2
5 X = 1 mole(s) of particles
25 X = 3 mole(s) of particles
COMPLETE
COMPLETE
(NH4)2SO4
Sucrose
mole(s) of particles
3 X = 1 mole(s) of particles
DONE
COMPLETE
Na2HPO4
mole(s) of particles
3
Answer:
check the picture down below
Explanation:
What are the names of the positive and negative electrodes of an electrolytic cell?
In an electrolytic cell, the positive electrode is known as anode, while the negative electrone is known as cathode.
What is an electrolytic cell?This is a type of cell that requires external electrical energy to work or to trigger a chemical reaction. This is only possible trough two types of electrodes: anode and cathode.
What is the difference between anode and cathode?The key differene is the type of charge, cathodes are negatively charged, while anode are positively charged.
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What is radioactive dating in chemistry?
PLEASE HELP!!!
In picture 4, the net force on the car is mostly the result of? A. Gravity. B. Constant velocity. C. Wind. D. Friction.
Answer:
D beacuse I think that's Force
What does absolute zero physically mean at the particle level?
ASAP!
Answer:
Absolute zero is the lowest limit of the thermodynamic temperature scale, a state at which the enthalpy and entropy of a cooled ideal gas reach their minimum value, taken as zero kelvin.