24. When is the energy released in a reaction?
Answer:
exothermic
Explanation:
because it releases energy
T/F Adsorption is a real problem in gravimetry, especially when the particle size is large
Answer:
False
Explanation:
3. What are the factors needed for phase change to happen?
A. Heat and pressure
C. Sound and radiation
B. Power and radiation
D. Force and velocity
Answer:
A. Heat and pressure
Explanation:
what happens to gas molecules as the pressure is increased while the temperature and volume of the container remain constant according to the kinetic molecular theory
Answer:
According to the kinetic molecular theory of gases, the average speed and kinetic energy of gas molecules would INCREASE.
Explanation:
In the kinetic molecular theory of gases, assumptions were made based on macroscopic properties of gas (pressure, volume and temperature) which are as a result of the microscopic properties like the position and the speed of the gas molecules. The kinetic molecular theory explains the behaviour of gases through the following 5 assumptions made about an ideal gas;
--> Molecules of a gas are in constant and rapid motion in straight lines until they collide with one another and with the walls of their containers.
--> The actual volume occupied by the had is negligible compared with the volume of the container.
--> Forces of attraction or repulsion between the molecules of a gas are negligible
--> The collision between the molecules is perfectly elastic.
--> The average kinetic energy of the gas molecules is proportional to the temperature of the gas.
Because gas molecules are in constant motion, it has kinetic energy which can be altered when there is increase in pressure. An increase in pressure will cause gas molecules to collide more frequently with one another. This in turn leads to increase in average speed and the kinetic energy of the individual molecules.
6. Calculate the mass of each product when 100.0 g of CuCl react according to the reaction
CuCl(aq) → CuCl2(aq) + Cu(s)
What do you notice about the sum of the masses of the products? What concept is being
illustrated here?
Answer:
67.91 g of CuCl2; 32.09 g of Cu.
Explanation:
The two masses add to 100.0 g, the initial amount of starting material, demonstrating the law of conservation of matter.
But Are Punnett square percentages always correct?
Answer:
yes
Explanation:
cuz is a square and if all angles are equal of a square then it is correct
electron configuration assignment pleaseee help asappp its 100 points and I give out brainly <3
Answer:
https://chem.libretexts.org/Bookshelves/Physical_and_Theoretical_Chemistry_Textbook_Maps/Supplemental_Modules_(Physical_and_Theoretical_Chemistry)/Quantum_Mechanics/10%3A_Multi-electron_Atoms/Electron_Configuration
Explanation:
Consider the following data on some weak acids and weak bases:
acid base
name formula Ka name formula Kb
hydrocyanic acid HCN 4.9 x 10^-10 hydroxylamine HONH2 1.1 x 10^-1
hypochlorous acid HCIA 3.0 x 10^-18 ethylamine C2H5NH2 6.4 x 10^-4
Use this data to rank the following solutions in order of increasing pH. In other words, select a '' next to the solution that will have the lowest pH, a '' next to the solution that will have the next lowest pH, and so on.
a. 0.1 M HONH3Br
b. 0.1 M NaNO3
c. 0.1 M C2H5NH3Cl
d. 0.1 M NaF
Answer:
a < c < b < d
Explanation:
The weak acid with the lowest pKa will be the most acidic. In the other way, the conjugate base which the acid is weakest will be strongest.
The weak base with the lowest pKb will be the most basic. And the conjugate base of the weakest base will be a strongest acid.
Using the values:
Ka HCN = 4.9x10⁻¹⁰
Kb HONH2 = 1.1x10⁻⁸
Ka HClA 3.0x10⁻⁸
Kb C2H5NH2 = 6.4x10⁻⁴
The NaNO3 is the conjugate base of a strong acid as HNO3. That means its solutions are almost neutral
The HONH3Br is the conjugate acid of a weak base. Its solutions will be acidics
C2H5NH3Cl is the conjugate acid of a weak base as ethylamine, its solutions will be acidic.
As ethylamine has a lower pkb than hydroxylamine, the conjugate acid of hydroxylamine will be more acidic.
NaF is the conjugate base of a weak acid as HF. Its solutions will be basics
The order in increasing pH is:
HONH3Br < C2H5NH3Cl < NaNO3 < NaF
a < c < b < dExplain three factors that can affect the size of a line in a spectrum.
Answer:For atoms and molecules, the width of spectral lines is governed mainly by the broadening of the energy levels of the atoms or molecules during interactions with surrounding particles and by the broadening of the spectral lines as a result of the Doppler effect.
Explanation:
What is the mass of 4.76 moles of Na3Po4?
SHOW WORK PLEASE - NO LINKS OR FILES(I will not open them)
( btw if you sent a link do not answer , I have already reported your accounts )
Answer:
780.354g
Explanation:
22.99(3)+30.97+16(4)
=163.94g/mol
163.94*4.76=780.354g...
A reaction occurs in which carbon combines with sulfur to form carbon
disulfide. Is this a chemical reaction or a nuclear reaction, and how do you
know?
A. This is a nuclear reaction, because mass was conserved.
B. This is a chemical reaction, because only the electrons were
rearranged.
C. This is a nuclear reaction, because there was a change in the
atoms' nuclei.
D. This is a chemical reaction, because mass was not conserved.
The reaction in which carbon combines with sulfur to form carbon
disulfide. Is
B. This is a chemical reaction, because only the electrons were rearranged.What is a chemical reaction?In a chemical reaction, bonds between molecules of the reactant are broken and new bonds between molecules of the product are established to create a new substance.
Chemical reactions occur all around us, including in our body's digestion of food and the creation of the sunlight's light. Understanding physical and chemical changes is crucial before starting any chemical reactions.
Sulfur and carbon combine to form carbon disulfide in an endothermic reaction that absorbs 92 kJ/mol of heat.
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The more energy that particles have, the ___ they move.
The more energy that particles have, the more they move.
Which of the two Lewis/electron dot structure representations, which is
the correct one for oxygen gas? PICTURE BELOW
Answer:
A
Explanation:
Share what you have learned about first aid to your family......
please help me with this.
Answer:
[tex] \huge\pink{ \mid{ \underline{ \overline{ \tt Answer :- }} \mid}}[/tex]
=> First Aid enables you to assist persons who become injured in the event of an accident or emergency situation until help arrives.
[tex] \huge\blue{ \mid{ \underline{ \overline{ \tt Situations :- }} \mid}}[/tex]
=> If an accident happens in the workplace, in your home or in a public space, you can use the help of a first aid kit.
=> In situations such as when someone ingests a harmful substance, suffers from a heart attack, a seizure or stroke, is involved in a motor vehicle accident or is caught in a natural disaster, a person trained and knowledgeable in even the very basics of First Aid can be of extreme importance in assisting the injured person(s) until emergency responders arrive.
7.In the oxidation of ethane: 2 C2H6 + 7 02 + 4CO2 + 6H2O how many
liters of O2 are required to react with 90 grams of ethane?
Answer:
If reaction is taking place at room temperature and pressure(rtp)
= 360 litres of O₂ at rtp
If reaction is taking place at standard temperature and pressure(stp):
= 336 litres of O₂ at stp
Explanation:
2C₂H₆ + 70₂ → 4CO₂ + 6H₂O
1 mole of C₂H₆ = (12 × 2) + (1 × 6) = 24 + 6 = 30g
2 moles of C₂H₆ = 30 × 2 = 60g
From the equation:
1 mole of 0₂ reacts with 2 moles of C₂H₆
1 mole of 0₂ reacts with 60g of C₂H₆
? moles of 0₂ react with 90g of C₂H₆
[tex]\frac{90}{60}[/tex]= 1.5 moles of O₂
Considering condition of reaction taking place whether room temperature and pressure(rtp) or standard temperature and pressure(stp)
If room temperature and pressure(rtp):
1 mole of 0₂ occupies 24 liters/24000 cm³/ 24 dm³ of O₂
1.5 moles of O₂ occupies (24 × 1.5) litres of O₂
= 360 litres of O₂ at rtp
If standard temperature and pressure(stp):
1 mole of 0₂ occupies 22.4 liters/22400 cm³/ 22.4 dm³ of O₂
1.5 moles of O₂ occupies (22,4 × 1.5) litres of O₂
= 336 litres of O₂ at stp
What is the wavelength of a photon with an energy of 3.26 x 10-19 J?
A. 527 nm
B. 610 nm
C. 492 nm
D. 671 nm
Answer:
610 nm
Explanation:
Apx
What is the number of moles in 4.81 L of H2S gas at STP?
Answer:
1.19 is the answer
Explanation:
What volume will 28 grams of nitrogen gas occupy at 27 Celsius and a
pressure of 785 mm Hg?
Answer: [tex]2.49\ m^3[/tex]
Explanation:
Given
Mass of nitrogen present [tex]m=28\ g[/tex]
Temperature [tex]T=27^{\circ}C\equiv 300\ K[/tex]
Pressure [tex]P=785\ mm\ \text{of}\ Hg\ \text{or}\ 1.032\ atm[/tex]
The molar mass of Nitrogen [tex]M=28\ g/mol[/tex]
No of moles of nitrogen present
[tex]n=\dfrac{m}{M}\\\\n=\dfrac{28}{28}\\\\n=1[/tex]
Using [tex]PV=nRT[/tex]
[tex]\Rightarrow 1.032\times V=1\times 8.314\times 300\\\\\Rightarrow V=\dfrac{2494.2}{1.032}\\\\\Rightarrow V=2494.2\ L\ \text{or}\ 2.49\ m^3[/tex]
Which organisms in soil helps relieve element so they can be recycled
Answer:
Explanation:
Protozoa and Bacteria: Protozoa are very small one-celled creatures. They play an important role in helping to make the soil better by feeding on bacteria and releasing excess nitrogen, which is really good for plants. Bacteria are among the tiniest and most numerous organisms in the soil.
Answer: Hewo there! your answer is Below
Soil bacteria perform recycling of soil organic matter through different processes, and as a result they produce and release into the soil inorganic molecules
Explanation:
Bacteria consume organic matter and other compounds and recycle them into substances that can be used by other organisms. Bacteria can live anywhere that has water. They are more numerous, can reproduce faster and can survive harsher conditions than any other organism on Earth.
Hope this helps you!!
Have a great day❤️❤️
-August-
hello guys pls help me!about the importance of a chemical compound !pls i need five point
Answer:
Chemical structure determines the molecular geometry of a compound by portraying the spatial arrangement of atoms and chemical bonds in the molecule. This provides chemists with an important visual representation of a chemical formula.
Describe one way that carbon and silicon are alike.
ASAP
Answer:
they have the same density
Consider the balanced equation Zn + 2HCl ZnCl2 + H2 How many
moles of ZnCl2 will be produced if 2 moles of HCl are used?
Answer:
1 mole of ZnCl₂
Explanation:
Just from the stoichiometric equation/ balanced equation:
Zn(s) + 2HCl(aq) → ZnCl₂(s) + H₂(g)
1 mole 2 moles 1 mole 1 mole
Therefore: 2 moles of 2HCl produce 1 mole of ZnCl₂
Which of the following is the weakest of the intermolecular forces?
A.Hydrogen bonds
B. Dipole-dipole interactions
C. Dipole-hydrogen interactions
D. London dispersion force
Answer:c
Explanation:yes
A conversion factor is a fraction in which the numerator is equal to the denominator.
a. True
b. False
Answer:
A
Explanation:
A conversion factor is a fraction whose numerator and denominator are the same quantity expressed in different units.
The given statement that a conversion factor is a fraction in which the numerator is equal to denominator is true.
What is a conversion factor?
Conversion factor is an expression which is used for obtaining relationship between units of a measurable quantity without any need of changing the value.It is also known as unit factor and is always equal to one.
Here the numerator represents part out of the whole portion .While the denominator represents the total number of parts.The method is based on the fact that any number or an expression can be multiplied by one without changing it's value.
As the multiplication by one does not change the value of measurement and so there is no change in the measurement units.It is a formula used for converting a measurement in one set of units to same measurement in another set of units.
It is usually given as a numerical ratio or fraction which can be used as a multiplication factor. Some examples of measurements which require conversions are: length,area and volume.
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A local orchard sells bags of red apples by the dozen. The packaging
department of the orchard determines the mass of each dozen batch of
red apples before bagging them. The bag is then labeled with the mass of
the apples. Observe the mass of the dozen red apples shown on the scale.
Based upon this mass, what would the mass of 7 red apples be in
kilograms? Assume that each of the dozen apples on the scale has the
same mass. Answer is rounded to one place after the decimal. 0.5 kg
2.00 kg
Answer:
2.0kg
Explanation:
The mass of 7 red apples in kilograms is to be considered as the 1.16 kilograms.
Calculation of the mass:Since the mass of a dozen apples is 2 kg.
we know that
1 dozen is 12 units
So the mass of 12 apples = 2kg
So mass of 1 apple = 2/12 = 1/6 kg
Now the mass of 7 apple is to be
= 7/6 kg
= 1.16 kg
hence, The mass of 7 red apples in kilograms is to be considered as the 1.16 kilograms.
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Describe the structure of ammonium laurel sulfates refer to the given diagram. Your answer should include the type of bonding, the elements contained, and the size and shape of the molecule. Write a short paragraph
Answer:
This ammonium laurel sulfates anion consists of a nonpolar hydrocarbon chain and a polar sulfate end group. It means it has a hydrophilic head and hydrophobic tail. There are ammonium ions, sulfate, and fatty acids present.
Lauryl sulfate has lauric acid attach to sulfate ions with carbon-sulfur bond, the fatty acid formed by the covalent bonds between C-C attached to hydrogens. Sulfur also bound to oxygen by covalent bonds. Nitrogen is surrounded by the four hydrogen atoms in the hydrophilic head.
Lauryl sulfate has lauric acid attach to sulfate ions with carbon-sulfur bond, the fatty acid formed by the covalent bonds between C-C attached to hydrogens.
What is a bond?A chemical bond is what holds atoms together in molecules.
Ammonium Laureth Sulfate is an ammonium salt of ethoxylated lauryl sulfate, a surfactant that contains PEG (polyethylene glycol) in its structure.
Ammonium laurel sulfates anion consists of a nonpolar hydrocarbon chain and a polar sulfate end group.
It means it has a hydrophilic head and hydrophobic tail. There are ammonium ions, sulfate, and fatty acids present.
Lauryl sulfate has lauric acid attach to sulfate ions with carbon-sulfur bond, the fatty acid formed by the covalent bonds between C-C attached to hydrogens.
Sulfur also bound to oxygen by covalent bonds. Nitrogen is surrounded by the four hydrogen atoms in the hydrophilic head.
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Pls help ASAP it’s timing meeee!!!!!
What is the mass of 4.76 moles of Na3Po4?
SHOW WORK PLEASE - NO LINKS OR FILES(I will not open them)
( btw if your user is Alexgrelli do not answer , I have already reported your account )
Answer:
780 g
Explanation:
Step 1: Given data
Moles of sodium phosphate: 4.76 moles
Step 2: Calculate the mass corresponding to 4.76 moles of sodium phosphate
To convert moles to mass, we need a conversion factor. In this case, we will use the molar mass of sodium phosphate, which is 163.94 g/mol.
4.76 mol × 163.94 g/mol = 780 g
What unit should you think of when using coefficients?
Answer:
Far as I know coefficients are unitless. sorry if this don't help ;)
HELP HELP HELP HELP !!!!!!